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• Adjust timezone of an AVM Fritz!Box 7390

  It's been a while that I purchased an AVM Fritz!Box 7390 but since I'm using this 'PABX' here in Mauritius, I'm not really happy about the wrong time in the logs or handsets connected. Lately, I had some spare time to address this issue, and the following article describes how to adjust the timezone settings in general. The original idea came from an FAQ found in c't 21/11 (for a 7270 written in German language) but I added a couple of things based on other resources online. The following tutorial may be valid for other models, too. Use your common sense and think before you act. Brief introduction to AVM Fritz!Box devices The Fritz!Box series of AVM has been around for more than a decade and those little 'red boxes' have a high level of versatility for your small office or home. High-speed connections, secure WLAN and convenient telephony make a home network out of any network. Whether it's a computer, tablet or smartphone, any device can be connected to the FRITZ!Box. And best of all, installation is so simple that users will be online in a matter of minutes. If you want to have peace of your mind in your small network then a Fritz!Box is the easiest way to achieve that. I'm using my box primarly as WiFi access point, VoIP gateway and media server but only because it came in second after my Linux system. Limitations in the administrative Web UI Unfortunately, there are no possibilities to adjust the timezone settings in the Web UI at all - even not in Expert mode. I assume that this is part of the 'simplification' provided by AVM's design team. That's okay, as long as you reside in Central Europe, and the implicit time handling is correct for your location. Adjusting the timezone I got my device through an order at Amazon Germany already some time ago, and honestly I wasn't bothered too much about the pre-configured (fixed) timezone setting - CET or CEST depending on daylight saving. But you know, it's that kind of splinter at the back of your head that keeps nagging and bothering you indirectly. So, finally I sat down yesterday evening and did a quick research on how to change the timezone. Even though there are a number of results, I read the FAQ from the c't magazine first, as I consider this as a trusted and safe source of information. Of course, it is most important to avoid to 'brick' your device. You've been warned - No support Tinkering with the configuration of any AVM devices seems to be a violation of their official support channels. So, be warned and continue onlyin case that you're sure about what you are going to do. The following solutions are 'as-is' and they worked for my box flawlessly but may cause an issue in your case. Don't blame me... Solution 1 - Backup, modify and restore That's the way as described in the c't article and a couple of other forum postings I found online, mainly from Australia. Login the administrative Web UI and navigate to 'System => Einstellungen sichern' (System => Backup configuration) and store your current configuration to a local file on your machine. Despite some online postings it is not necessary to specify a password in order to secure or encrypt your backup. IMHO, this only adds another unnecessary layer of complexity to the process. Anyway, next you should create a another copy of your settings and keep it unmodified. That's our safety net to restore the current settings in case that we might have to issue a factory setting reset to the box. Now, open the configuration file with an advanced text editor which is capable to deal with Unix carriage returns properly - Windows Notepad doesn't do the job but Wordpad or Notepad++. Personally, I don't care and simply use geany, gedit or nano on Linux. In total there are 3 modifications that we have to apply to the configuration file - one new line and two adjustments. First, we have to add an instruction near the top of file that overrides the device internal checksum validation. Without this line, your settings won't be accepted. Caution: The drectives are case-sensitve and your outcome should read something like this: **** FRITZ!Box Fon WLAN 7390 CONFIGURATION EXPORTPassword=$$$$<ignore>FirmwareVersion=84.05.52CONFIG_INSTALL_TYPE=iks_16MB_xilinx_4eth_2ab_isdn_nt_te_pots_wlan_usb_host_dect_64415OEM=avmCountry=049Language=deNoChecks=yes**** CFGFILE:ar7.cfg/* * /var/flash/ar7.cfg * Mon Jul 29 10:49:18 2013 */ar7cfg {... Then search for the expression 'timezone' and you should find a section like this one (~ line 1113): timezone_manual {        enabled = no;        offset = 0;        dst_enabled = no;        TZ_string = "";        name = "";} We would like to manually handle the timezone setting in our device and therefore we have to enable it and set the proper value for Mauritius. The configuration block should like so afterwards: timezone_manual {        enabled = yes;        offset = 0;        dst_enabled = no;        TZ_string = "MUT-4";        name = "";} We specify the designation and the offset in hours of the timezone we would like to have. Caution: The offset indicates the value one has to add to the local time to arrive at UTC. More details are described in the Explanation of TZ strings. Mauritius has GMT+4 which means that we have to substract 4 hours from the local time to have UTC. Finally, we restore the modified configuration file via the administrative Web UI under 'System => Einstellungen sichern => Wiederherstellen' (System => Backup configuration => Restore). This triggers a reboot of the device, so please be patient and wait until the Web UI displays the login dialog again. Good luck! Solution 2 - Telnet A more elegant, read: technically interesting, way to adjust configuration settings in your Fritz!Box is to access it directly through Telnet. By default AVM disables that protocol channel and you have to enable it with a connected telephone. In order to activate the telnet service dial the following combination: #96*7* #96*8* (to disable telnet again after work has been completed) If you're using an AVM handset like the Fritz!Fon then you will receive a confirmation message on the display like so: telnetd ein Next, depending on your favourite operating system, you either launch a Command prompt in Windows or a terminal in Linux, get your Admin password ready, and you connect to your box like so: $ telnet fritz.box Trying 192.168.1.1...Connected to fritz.box.Escape character is '^]'.password: BusyBox v1.19.3 (2012-10-12 14:52:09 CEST) built-in shell (ash)Enter 'help' for a list of built-in commands.ermittle die aktuelle TTYtty is "/dev/pts/0"Console Ausgaben auf dieses Terminal umgelenkt# That's it, you are connected and we can continue to change the configuration manually. In order to adjust the timezone setting we have to open the ar7.cfg file. As we are now operating in a specialised environment, we only have limited capabilities at hand. One of those is a reduced version of vi - nvi. Let's open a second browser window with the fine manual page of nvi and start to edit our configuration file: # nvi /var/flash/ar7.cfg In our configuration file, we have to navigate to the timezone directives. The easiest way is to search for the expression 'timezone' by typing in the following: /timezone    (press Enter/Return) Now, we should see the exact lines of code like in the backed up version: timezone_manual {                                                                            enabled = no;                                                          offset = 0;                                                         dst_enabled = no;                                                   TZ_string = "";                                                     name = "";                                                        } And of course, we apply the same changes as described in the previous section: timezone_manual {                                                                            enabled = yes;                                                          offset = 0;                                                         dst_enabled = no;                                                   TZ_string = "MUT-4";                                                     name = "";                                                        } Finally, we have to write our changes back to the file and apply the new settings. :wq    (press Enter/Return) # ar7cfgchanged That's it! Finally, close the telnet session by pressing Ctrl+] and enter 'quit'. Additional ideas... There are a couple of more possibilities to enhance and to extend the usability of a Fritz!Box. There are lots of resources available on the net, but I'd like to name a few here. Especially for Linux users it is essential to be able to connect to any device remotely in a  safe and secure way. And the installation of a SSH server on the box would be a first step to improve this situation, also to avoid to run telnet after all. Sometimes, there might be problems in your VoIP connections, feel free to adjust the settings of codecs and connection handling, too. I guess, you'll get the idea... The only frontiers are in your mind.

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• .NET Code Evolution

  - by Alois Kraus

  Originally posted on: http://geekswithblogs.net/akraus1/archive/2013/07/24/153504.aspxAt my day job I do look at a lot of code written by other people. Most of the code is quite good and some is even a masterpiece. And there is also code which makes you think WTF… oh it was written by me. Hm not so bad after all. There are many excuses reasons for bad code. Most often it is time pressure followed by not enough ambition (who cares) or insufficient training. Normally I do care about code quality quite a lot which makes me a (perceived) slow worker who does write many tests and refines the code quite a lot because of the design deficiencies. Most of the deficiencies I do find by putting my design under stress while checking for invariants. It does also help a lot to step into the code with a debugger (sometimes also Windbg). I do this much more often when my tests are red. That way I do get a much better understanding what my code really does and not what I think it should be doing. This time I do want to show you how code can evolve over the years with different .NET Framework versions. Once there was  time where .NET 1.1 was new and many C++ programmers did switch over to get rid of not initialized pointers and memory leaks. There were also nice new data structures available such as the Hashtable which is fast lookup table with O(1) time complexity. All was good and much code was written since then. At 2005 a new version of the .NET Framework did arrive which did bring many new things like generics and new data structures. The “old” fashioned way of Hashtable were coming to an end and everyone used the new Dictionary<xx,xx> type instead which was type safe and faster because the object to type conversion (aka boxing) was no longer necessary. I think 95% of all Hashtables and dictionaries use string as key. Often it is convenient to ignore casing to make it easy to look up values which the user did enter. An often followed route is to convert the string to upper case before putting it into the Hashtable. Hashtable Table = new Hashtable(); void Add(string key, string value) { Table.Add(key.ToUpper(), value); } This is valid and working code but it has problems. First we can pass to the Hashtable a custom IEqualityComparer to do the string matching case insensitive. Second we can switch over to the now also old Dictionary type to become a little faster and we can keep the the original keys (not upper cased) in the dictionary. Dictionary<string, string> DictTable = new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase); void AddDict(string key, string value) { DictTable.Add(key, value); } Many people do not user the other ctors of Dictionary because they do shy away from the overhead of writing their own comparer. They do not know that .NET has for strings already predefined comparers at hand which you can directly use. Today in the many core area we do use threads all over the place. Sometimes things break in subtle ways but most of the time it is sufficient to place a lock around the offender. Threading has become so mainstream that it may sound weird that in the year 2000 some guy got a huge incentive for the idea to reduce the time to process calibration data from 12 hours to 6 hours by using two threads on a dual core machine. Threading does make it easy to become faster at the expense of correctness. Correct and scalable multithreading can be arbitrarily hard to achieve depending on the problem you are trying to solve. Lets suppose we want to process millions of items with two threads and count the processed items processed by all threads. A typical beginners code might look like this: int Counter; void IJustLearnedToUseThreads() { var t1 = new Thread(ThreadWorkMethod); t1.Start(); var t2 = new Thread(ThreadWorkMethod); t2.Start(); t1.Join(); t2.Join(); if (Counter != 2 * Increments) throw new Exception("Hmm " + Counter + " != " + 2 * Increments); } const int Increments = 10 * 1000 * 1000; void ThreadWorkMethod() { for (int i = 0; i < Increments; i++) { Counter++; } } It does throw an exception with the message e.g. “Hmm 10.222.287 != 20.000.000” and does never finish. The code does fail because the assumption that Counter++ is an atomic operation is wrong. The ++ operator is just a shortcut for Counter = Counter + 1 This does involve reading the counter from a memory location into the CPU, incrementing value on the CPU and writing the new value back to the memory location. When we do look at the generated assembly code we will see only inc dword ptr [ecx+10h] which is only one instruction. Yes it is one instruction but it is not atomic. All modern CPUs have several layers of caches (L1,L2,L3) which try to hide the fact how slow actual main memory accesses are. Since cache is just another word for redundant copy it can happen that one CPU does read a value from main memory into the cache, modifies it and write it back to the main memory. The problem is that at least the L1 cache is not shared between CPUs so it can happen that one CPU does make changes to values which did change in meantime in the main memory. From the exception you can see we did increment the value 20 million times but half of the changes were lost because we did overwrite the already changed value from the other thread. This is a very common case and people do learn to protect their  data with proper locking.   void Intermediate() { var time = Stopwatch.StartNew(); Action acc = ThreadWorkMethod_Intermediate; var ar1 = acc.BeginInvoke(null, null); var ar2 = acc.BeginInvoke(null, null); ar1.AsyncWaitHandle.WaitOne(); ar2.AsyncWaitHandle.WaitOne(); if (Counter != 2 * Increments) throw new Exception(String.Format("Hmm {0:N0} != {1:N0}", Counter, 2 * Increments)); Console.WriteLine("Intermediate did take: {0:F1}s", time.Elapsed.TotalSeconds); } void ThreadWorkMethod_Intermediate() { for (int i = 0; i < Increments; i++) { lock (this) { Counter++; } } } This is better and does use the .NET Threadpool to get rid of manual thread management. It does give the expected result but it can result in deadlocks because you do lock on this. This is in general a bad idea since it can lead to deadlocks when other threads use your class instance as lock object. It is therefore recommended to create a private object as lock object to ensure that nobody else can lock your lock object. When you read more about threading you will read about lock free algorithms. They are nice and can improve performance quite a lot but you need to pay close attention to the CLR memory model. It does make quite weak guarantees in general but it can still work because your CPU architecture does give you more invariants than the CLR memory model. For a simple counter there is an easy lock free alternative present with the Interlocked class in .NET. As a general rule you should not try to write lock free algos since most likely you will fail to get it right on all CPU architectures. void Experienced() { var time = Stopwatch.StartNew(); Task t1 = Task.Factory.StartNew(ThreadWorkMethod_Experienced); Task t2 = Task.Factory.StartNew(ThreadWorkMethod_Experienced); t1.Wait(); t2.Wait(); if (Counter != 2 * Increments) throw new Exception(String.Format("Hmm {0:N0} != {1:N0}", Counter, 2 * Increments)); Console.WriteLine("Experienced did take: {0:F1}s", time.Elapsed.TotalSeconds); } void ThreadWorkMethod_Experienced() { for (int i = 0; i < Increments; i++) { Interlocked.Increment(ref Counter); } } Since time does move forward we do not use threads explicitly anymore but the much nicer Task abstraction which was introduced with .NET 4 at 2010. It is educational to look at the generated assembly code. The Interlocked.Increment method must be called which does wondrous things right? Lets see: lock inc dword ptr [eax] The first thing to note that there is no method call at all. Why? Because the JIT compiler does know very well about CPU intrinsic functions. Atomic operations which do lock the memory bus to prevent other processors to read stale values are such things. Second: This is the same increment call prefixed with a lock instruction. The only reason for the existence of the Interlocked class is that the JIT compiler can compile it to the matching CPU intrinsic functions which can not only increment by one but can also do an add, exchange and a combined compare and exchange operation. But be warned that the correct usage of its methods can be tricky. If you try to be clever and look a the generated IL code and try to reason about its efficiency you will fail. Only the generated machine code counts. Is this the best code we can write? Perhaps. It is nice and clean. But can we make it any faster? Lets see how good we are doing currently. Level Time in s IJustLearnedToUseThreads Flawed Code Intermediate 1,5 (lock) Experienced 0,3 (Interlocked.Increment) Master 0,1 (1,0 for int[2]) That lock free thing is really a nice thing. But if you read more about CPU cache, cache coherency, false sharing you can do even better. int[] Counters = new int[12]; // Cache line size is 64 bytes on my machine with an 8 way associative cache try for yourself e.g. 64 on more modern CPUs void Master() { var time = Stopwatch.StartNew(); Task t1 = Task.Factory.StartNew(ThreadWorkMethod_Master, 0); Task t2 = Task.Factory.StartNew(ThreadWorkMethod_Master, Counters.Length - 1); t1.Wait(); t2.Wait(); Counter = Counters[0] + Counters[Counters.Length - 1]; if (Counter != 2 * Increments) throw new Exception(String.Format("Hmm {0:N0} != {1:N0}", Counter, 2 * Increments)); Console.WriteLine("Master did take: {0:F1}s", time.Elapsed.TotalSeconds); } void ThreadWorkMethod_Master(object number) { int index = (int) number; for (int i = 0; i < Increments; i++) { Counters[index]++; } } The key insight here is to use for each core its own value. But if you simply use simply an integer array of two items, one for each core and add the items at the end you will be much slower than the lock free version (factor 3). Each CPU core has its own cache line size which is something in the range of 16-256 bytes. When you do access a value from one location the CPU does not only fetch one value from main memory but a complete cache line (e.g. 16 bytes). This means that you do not pay for the next 15 bytes when you access them. This can lead to dramatic performance improvements and non obvious code which is faster although it does have many more memory reads than another algorithm. So what have we done here? We have started with correct code but it was lacking knowledge how to use the .NET Base Class Libraries optimally. Then we did try to get fancy and used threads for the first time and failed. Our next try was better but it still had non obvious issues (lock object exposed to the outside). Knowledge has increased further and we have found a lock free version of our counter which is a nice and clean way which is a perfectly valid solution. The last example is only here to show you how you can get most out of threading by paying close attention to your used data structures and CPU cache coherency. Although we are working in a virtual execution environment in a high level language with automatic memory management it does pay off to know the details down to the assembly level. Only if you continue to learn and to dig deeper you can come up with solutions no one else was even considering. I have studied particle physics which does help at the digging deeper part. Have you ever tried to solve Quantum Chromodynamics equations? Compared to that the rest must be easy ;-). Although I am no longer working in the Science field I take pride in discovering non obvious things. This can be a very hard to find bug or a new way to restructure data to make something 10 times faster. Now I need to get some sleep ….

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• From HttpRuntime.Cache to Windows Azure Caching (Preview)

  - by Jeff

  I don’t know about you, but the announcement of Windows Azure Caching (Preview) (yes, the parentheses are apparently part of the interim name) made me a lot more excited about using Azure. Why? Because one of the great performance tricks of any Web app is to cache frequently used data in memory, so it doesn’t have to hit the database, a service, or whatever. When you run your Web app on one box, HttpRuntime.Cache is a sweet and stupid-simple solution. Somewhere in the data fetching pieces of your app, you can see if an object is available in cache, and return that instead of hitting the data store. I did this quite a bit in POP Forums, and it dramatically cuts down on the database chatter. The problem is that it falls apart if you run the app on many servers, in a Web farm, where one server may initiate a change to that data, and the others will have no knowledge of the change, making it stale. Of course, if you have the infrastructure to do so, you can use something like memcached or AppFabric to do a distributed cache, and achieve the caching flavor you desire. You could do the same thing in Azure before, but it would cost more because you’d need to pay for another role or VM or something to host the cache. Now, you can use a portion of the memory from each instance of a Web role to act as that cache, with no additional cost. That’s huge. So if you’re using a percentage of memory that comes out to 100 MB, and you have three instances running, that’s 300 MB available for caching. For the uninitiated, a Web role in Azure is essentially a VM that runs a Web app (worker roles are the same idea, only without the IIS part). You can spin up many instances of the role, and traffic is load balanced to the various instances. It’s like adding or removing servers to a Web farm all willy-nilly and at your discretion, and it’s what the cloud is all about. I’d say it’s my favorite thing about Windows Azure. The slightly annoying thing about developing for a Web role in Azure is that the local emulator that’s launched by Visual Studio is a little on the slow side. If you’re used to using the built-in Web server, you’re used to building and then alt-tabbing to your browser and refreshing a page. If you’re just changing an MVC view, you’re not even doing the building part. Spinning up the simulated Azure environment is too slow for this, but ideally you want to code your app to use this fantastic distributed cache mechanism. So first off, here’s the link to the page showing how to code using the caching feature. If you’re used to using HttpRuntime.Cache, this should be pretty familiar to you. Let’s say that you want to use the Azure cache preview when you’re running in Azure, but HttpRuntime.Cache if you’re running local, or in a regular IIS server environment. Through the magic of dependency injection, we can get there pretty quickly. First, design an interface to handle the cache insertion, fetching and removal. Mine looks like this: public interface ICacheProvider {     void Add(string key, object item, int duration);     T Get<T>(string key) where T : class;     void Remove(string key); } Now we’ll create two implementations of this interface… one for Azure cache, one for HttpRuntime: public class AzureCacheProvider : ICacheProvider {     public AzureCacheProvider()     {         _cache = new DataCache("default"); // in Microsoft.ApplicationServer.Caching, see how-to      }         private readonly DataCache _cache;     public void Add(string key, object item, int duration)     {         _cache.Add(key, item, new TimeSpan(0, 0, 0, 0, duration));     }     public T Get<T>(string key) where T : class     {         return _cache.Get(key) as T;     }     public void Remove(string key)     {         _cache.Remove(key);     } } public class LocalCacheProvider : ICacheProvider {     public LocalCacheProvider()     {         _cache = HttpRuntime.Cache;     }     private readonly System.Web.Caching.Cache _cache;     public void Add(string key, object item, int duration)     {         _cache.Insert(key, item, null, DateTime.UtcNow.AddMilliseconds(duration), System.Web.Caching.Cache.NoSlidingExpiration);     }     public T Get<T>(string key) where T : class     {         return _cache[key] as T;     }     public void Remove(string key)     {         _cache.Remove(key);     } } Feel free to expand these to use whatever cache features you want. I’m not going to go over dependency injection here, but I assume that if you’re using ASP.NET MVC, you’re using it. Somewhere in your app, you set up the DI container that resolves interfaces to concrete implementations (Ninject call is a “kernel” instead of a container). For this example, I’ll show you how StructureMap does it. It uses a convention based scheme, where if you need to get an instance of IFoo, it looks for a class named Foo. You can also do this mapping explicitly. The initialization of the container looks something like this: ObjectFactory.Initialize(x =>             {                 x.Scan(scan =>                         {                             scan.AssembliesFromApplicationBaseDirectory();                             scan.WithDefaultConventions();                         });                 if (Microsoft.WindowsAzure.ServiceRuntime.RoleEnvironment.IsAvailable)                     x.For<ICacheProvider>().Use<AzureCacheProvider>();                 else                     x.For<ICacheProvider>().Use<LocalCacheProvider>();             }); If you use Ninject or Windsor or something else, that’s OK. Conceptually they’re all about the same. The important part is the conditional statement that checks to see if the app is running in Azure. If it is, it maps ICacheProvider to AzureCacheProvider, otherwise it maps to LocalCacheProvider. Now when a request comes into your MVC app, and the chain of dependency resolution occurs, you can see to it that the right caching code is called. A typical design may have a call stack that goes: Controller –> BusinessLogicClass –> Repository. Let’s say your repository class looks like this: public class MyRepo : IMyRepo {     public MyRepo(ICacheProvider cacheProvider)     {         _context = new MyDataContext();         _cache = cacheProvider;     }     private readonly MyDataContext _context;     private readonly ICacheProvider _cache;     public SomeType Get(int someTypeID)     {         var key = "somename-" + someTypeID;         var cachedObject = _cache.Get<SomeType>(key);         if (cachedObject != null)         {             _context.SomeTypes.Attach(cachedObject);             return cachedObject;         }         var someType = _context.SomeTypes.SingleOrDefault(p => p.SomeTypeID == someTypeID);         _cache.Add(key, someType, 60000);         return someType;     } ... // more stuff to update, delete or whatever, being sure to remove // from cache when you do so  When the DI container gets an instance of the repo, it passes an instance of ICacheProvider to the constructor, which in this case will be whatever implementation was specified when the container was initialized. The Get method first tries to hit the cache, and of course doesn’t care what the underlying implementation is, Azure, HttpRuntime, or otherwise. If it finds the object, it returns it right then. If not, it hits the database (this example is using Entity Framework), and inserts the object into the cache before returning it. The important thing not pictured here is that other methods in the repo class will construct the key for the cached object, in this case “somename-“ plus the ID of the object, and then remove it from cache, in any method that alters or deletes the object. That way, no matter what instance of the role is processing the request, it won’t find the object if it has been made stale, that is, updated or outright deleted, forcing it to attempt to hit the database. So is this good technique? Well, sort of. It depends on how you use it, and what your testing looks like around it. Because of differences in behavior and execution of the two caching providers, for example, you could see some strange errors. For example, I immediately got an error indicating there was no parameterless constructor for an MVC controller, because the DI resolver failed to create instances for the dependencies it had. In reality, the NuGet packaged DI resolver for StructureMap was eating an exception thrown by the Azure components that said my configuration, outlined in that how-to article, was wrong. That error wouldn’t occur when using the HttpRuntime. That’s something a lot of people debate about using different components like that, and how you configure them. I kinda hate XML config files, and like the idea of the code-based approach above, but you should be darn sure that your unit and integration testing can account for the differences.

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• Fluent NHibernate: mapping complex many-to-many (with additional columns) and setting fetch

  - by HackedByChinese

  I need a Fluent NHibernate mapping that will fulfill the following (if nothing else, I'll also take the appropriate NHibernate XML mapping and reverse engineer it). DETAILS I have a many-to-many relationship between two entities: Parent and Child. That is accomplished by an additional table to store the identities of the Parent and Child. However, I also need to define two additional columns on that mapping that provide more information about the relationship. This is roughly how I've defined my types, at least the relevant parts (where Entity is some base type that provides an Id property and checks for equivalence based on that Id): public class Parent : Entity { public virtual IList<ParentChildRelationship> Children { get; protected set; } public virtual void AddChildRelationship(Child child, int customerId) { var relationship = new ParentChildRelationship { CustomerId = customerId, Parent = this, Child = child }; if (Children == null) Children = new List<ParentChildRelationship>(); if (Children.Contains(relationship)) return; relationship.Sequence = Children.Count; Children.Add(relationship); } } public class Child : Entity { // child doesn't care about its relationships } public class ParentChildRelationship { public int CustomerId { get; set; } public Parent Parent { get; set; } public Child Child { get; set; } public int Sequence { get; set; } public override bool Equals(object obj) { if (ReferenceEquals(null, obj)) return false; if (ReferenceEquals(this, obj)) return true; var other = obj as ParentChildRelationship; if (return other == null) return false; return (CustomerId == other.CustomerId && Parent == other.Parent && Child == other.Child); } public override int GetHashCode() { unchecked { int result = CustomerId; result = Parent == null ? 0 : (result*397) ^ Parent.GetHashCode(); result = Child == null ? 0 : (result*397) ^ Child.GetHashCode(); return result; } } } The tables in the database look approximately like (assume primary/foreign keys and forgive syntax): create table Parent ( id int identity(1,1) not null ) create table Child ( id int identity(1,1) not null ) create table ParentChildRelationship ( customerId int not null, parent_id int not null, child_id int not null, sequence int not null ) I'm OK with Parent.Children being a lazy loaded property. However, the ParentChildRelationship should eager load ParentChildRelationship.Child. Furthermore, I want to use a Join when I eager load. The SQL, when accessing Parent.Children, NHibernate should generate an equivalent query to: SELECT * FROM ParentChildRelationship rel LEFT OUTER JOIN Child ch ON rel.child_id = ch.id WHERE parent_id = ? OK, so to do that I have mappings that look like this: ParentMap : ClassMap<Parent> { public ParentMap() { Table("Parent"); Id(c => c.Id).GeneratedBy.Identity(); HasMany(c => c.Children).KeyColumn("parent_id"); } } ChildMap : ClassMap<Child> { public ChildMap() { Table("Child"); Id(c => c.Id).GeneratedBy.Identity(); } } ParentChildRelationshipMap : ClassMap<ParentChildRelationship> { public ParentChildRelationshipMap() { Table("ParentChildRelationship"); CompositeId() .KeyProperty(c => c.CustomerId, "customerId") .KeyReference(c => c.Parent, "parent_id") .KeyReference(c => c.Child, "child_id"); Map(c => c.Sequence).Not.Nullable(); } } So, in my test if i try to get myParentRepo.Get(1).Children, it does in fact get me all the relationships and, as I access them from the relationship, the Child objects (for example, I can grab them all by doing parent.Children.Select(r => r.Child).ToList()). However, the SQL that NHibernate is generating is inefficient. When I access parent.Children, NHIbernate does a SELECT * FROM ParentChildRelationship WHERE parent_id = 1 and then a SELECT * FROM Child WHERE id = ? for each child in each relationship. I understand why NHibernate is doing this, but I can't figure out how to set up the mapping to make NHibernate query the way I mentioned above.

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• Strange exception when connecting to a WCF service via a proxy server

  - by Slauma

  The exception "This operation is not supported for a relative URI." occurs in the following situation: I have a WCF service: [ServiceContract(ProtectionLevel=ProtectionLevel.None)] public interface IMyService { [OperationContract] [FaultContract(typeof(MyFault))] List<MyDto> MyOperation(int param); // other operations } public class MyService : IMyService { public List<MyDto> MyOperation(int param) { // Do the business stuff and return a list of MyDto } // other implementations } MyFault and MyDto are two very simple classes marked with [DataContract] attribute and each only having three [DataMember] of type string, int and int?. This service is hosted in IIS 7.0 on a Win 2008 Server along with an ASP.NET application. I am using an SVC file MyService.svc which is located directly in the root of the web site. The service configuration in web.config is the following: <system.serviceModel> <services> <service name="MyServiceLib.MyService"> <endpoint address="" binding="wsHttpBinding" bindingConfiguration="wsHttpBindingConfig" contract="MyServiceLib.IMyService" /> </service> </services> <bindings> <wsHttpBinding> <binding name="wsHttpBindingConfig"> <security mode="None"> <transport clientCredentialType="None" /> </security> </binding> </wsHttpBinding> </bindings> <behaviors> <serviceBehaviors> <behavior> <serviceMetadata httpGetEnabled="false"/> <serviceDebug includeExceptionDetailInFaults="false" /> </behavior> </serviceBehaviors> </behaviors> </system.serviceModel> This seems to work so far as I can enter the address http://www.domain.com/MyService.svc in a browser and get the "This is a Windows Communication Foundation Service"-Welcome page. One of the clients consuming the service is a console application: MyServiceClient aChannel = new MyServiceClient("WSHttpBinding_IMyService"); List<MyDto> aMyDtoList = aChannel.MyOperation(1); It has the following configuration: <system.serviceModel> <bindings> <wsHttpBinding> <binding name="WSHttpBinding_IMyService" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" bypassProxyOnLocal="true" transactionFlow="false" hostNameComparisonMode="StrongWildcard" maxBufferPoolSize="524288" maxReceivedMessageSize="65536" messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="false" proxyAddress="10.20.30.40:8080" allowCookies="false"> <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /> <reliableSession ordered="true" inactivityTimeout="00:10:00" enabled="false" /> <security mode="None"> <transport clientCredentialType="Windows" proxyCredentialType="None" realm="" /> <message clientCredentialType="Windows" negotiateServiceCredential="true" /> </security> </binding> </wsHttpBinding> </bindings> <client> <endpoint address="http://www.domain.com/MyService.svc" binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IMyService" contract="MyService.IMyService" name="WSHttpBinding_IMyService" /> </client> </system.serviceModel> When I run this application at a production server at a customer site calling aChannel.MyOperation(1) throws the following exception: This operation is not supported for a relative URI. When I run this client application on my development PC with exactly the same config, with the exception that I remove proxyAddress="10.20.30.40:8080" from the bindings the operation works without problems. Now I really don't know what specifying a proxy server address might have to do with absolute or relative URIs. The use of the proxy server or not is the only difference I can see when running the client on the production or on the development machine. Does someone have an idea what this exception might mean in this context and how possibly to solve the problem? Thank you in advance for help!

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• UITableView: Juxtaposing row, header, and footer insertions/deletions

  - by jdandrea

  Consider a very simple UITableView with one of two states. First state: One (overall) table footer One section containing two rows, a section header, and a section footer Second state: No table footer One section containing four rows and no section header/footer In both cases, each row is essentially one of four possible UITableViewCell objects, each containing its own UITextField. We don't even bother with reuse or caching, since we're only dealing with four known cells in this case. They've been created in an accompanying XIB, so we already have them all wired up and ready to go. Now consider we want to toggle between the two states. Sounds easy enough. Let's suppose our view controller's right bar button item provides the toggling support. We'll also track the current state with an ivar and enumeration. To be explicit for a sec, here's how one might go from state 1 to 2. (Presume we handle the bar button item's title as well.) In short, we want to clear out our table's footer view, then insert the third and fourth rows. We batch this inside an update block like so: // Brute forced references to the third and fourth rows in section 0 NSUInteger row02[] = {0, 2}; NSUInteger row03[] = {0, 3}; [self.tableView beginUpdates]; state = tableStateTwo; // 'internal' iVar, not a property self.tableView.tableFooterView = nil; [self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObjects: [NSIndexPath indexPathWithIndexes:row02 length:2], [NSIndexPath indexPathWithIndexes:row03 length:2], nil] withRowAnimation:UITableViewRowAnimationFade]; [self.tableView endUpdates]; For the reverse, we want to reassign the table footer view (which, like the cells, is in the XIB ready and waiting), and remove the last two rows: // Use row02 and row03 from earlier snippet [self.tableView beginUpdates]; state = tableStateOne; self.tableView.tableFooterView = theTableFooterView; [self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObjects: [NSIndexPath indexPathWithIndexes:row02 length:2], [NSIndexPath indexPathWithIndexes:row03 length:2], nil] withRowAnimation:UITableViewRowAnimationFade]; [self.tableView endUpdates]; Now, when the table asks for rows, it's very cut and dry. The first two cells are the same in both cases. Only the last two appear/disappear depending on the state. The state ivar is consulted when the Table View asks for things like number of rows in a section, height for header/footer in a section, or view for header/footer in a section. This last bit is also where I'm running into trouble. Using the above logic, section 0's header/footer does not disappear. Specifically, the footer stays below the inserted rows, but the header now overlays the topmost row. If we switch back to state one, the section footer is removed, but the section header remains. How about using [self.tableView reloadData] then? Sure, why not. We take care not to use it inside the update block, per Apple's advisement, and simply add it after endUpdates. This time, good news! The section 0 header/footer disappears. :) However ... Toggling back to state one results in a most exquisite mess! The section 0 header returns, only to overlay the first row once again (instead of appear above it). The section 0 footer is placed below the last row just fine, but the overall table footer - now reinstated - overlays the section footer. Waaaaaah … now what? Just to be sure, let's toggle back to state two again. Yep, that looks fine. Coming back to state one? Yecccch. I also tried sprinkling in a few other stunts like using reloadSections:withRowAnimation:, but that only serves to make things worse. NSRange range = {0, 1}; NSIndexSet *indexSet = [NSIndexSet indexSetWithIndexesInRange:range]; ... [self.tableView reloadSections:indexSet withRowAnimation:UITableViewRowAnimationFade]; Case in point: If we invoke reloadSections... just before the end of the update block, changing to state two hides the first two rows from view, even though the space they would otherwise occupy remains. Switching back to state one returns section 0's header/footer to normal, but those first two rows remain invisible. Case two: Moving reloadSections... to just after the update block but before reloadData results in all rows becoming invisible! (I refer to the row as being invisible because, during tracing, tableView:cellForRowAtIndexPath: is returning bona-fide cell objects for those rows.) Case three: Moving reloadSections... after tableView:cellForRowAtIndexPath: brings us a bit closer, but the section 0 header/footer never returns when switching back to state one. Hmm. Perhaps it's a faux pas using both reloadSections... and reloadData, based on what I'm seeing at trace-time, which brings us to: Case four: Replacing reloadData with reloadSections... outright. All cells in state two disappear. All cells in state one remain missing as well (though the space is kept). So much for that theory. :) Tracing through the code, the cell and view objects, as well as the section heights, are all where they should be at the opportune times. They just aren't rendering sanely. So, how to crack this case? Clues welcome/appreciated!

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• Where is ScriptManager.IsStartupScriptRegistered method?

  - by Ismail S

  Below is my code if (!Page.ClientScript.IsStartupScriptRegistered(Page.GetType(), scriptKey)) { ScriptManager scriptManager = ScriptManager.GetCurrent(page); if (scriptManager != null && scriptManager.IsInAsyncPostBack) { //if a MS AJAX request, use the Scriptmanager class ScriptManager.RegisterStartupScript(Page, Page.GetType(), scriptKey, script, true); } else { //if a standard postback, use the standard ClientScript method Page.ClientScript.RegisterStartupScript(Page.GetType(), scriptKey, script, true); } } I'm doing as suggested in this answer so that I can register startup script on both times i.e. when there is partial postback and a full postback. The problem is Page.ClientScript.IsStartupScriptRegistered(Page.GetType(), scriptKey) always returns false when it is partial postback. And I couldn't find ScriptManager.IsStartupScriptRegistered method. As a result of this additional script is emitted on all partial/async postbacks. Please note that I'm using script manager of AjaxControlToolkit version 4.1 i.e. ToolkitScriptManager in my masterpage. But I don't thing it has something to do with this. UPDATE <asp:UpdatePanel ID="ContactDetailsUpdatePanel" UpdateMode="Conditional" runat="server"> <Triggers> <asp:AsyncPostBackTrigger ControlID="UpdateContactDetailsButton" EventName="Click" /> </Triggers> <ContentTemplate> <div id="ContactDetailsContent" class="contact_details_content"> <div class="customer_contactdetails_left_pane"> <div class="customer_name_field"> <asp:Label ID="CustomerNameLabel" runat="server" Text="Customer" /> <asp:TextBox ID="CustomerNameValue" runat="server" /> </div> <div class="customer_address_field"> <asp:Label ID="CustomerAddressLabel" runat="server" Text="Address" /> <asp:TextBox ID="CustomerAddressValue" runat="server" /> <asp:TextBox ID="CustomerAddressValue1" runat="server" /> <asp:TextBox ID="CustomerAddressValue2" runat="server" /> <asp:TextBox ID="CustomerAddressValue3" runat="server" /> </div> <div class="customer_postcode_field"> <asp:Label ID="CustomerPostcodeLabel" runat="server" Text="Postcode" /> <asp:TextBox ID="CustomerPostcodeValue" runat="server" /> </div> </div> <div class="customer_contactdetails_right_pane"> <div> <asp:Label ID="CustomerContactLabel" runat="server" Text="Contact" /> <asp:TextBox ID="CustomerContactValue" runat="server" /> </div> <div> <asp:Label ID="CustomerTelephoneLabel" runat="server" Text="Telephone" /> <asp:TextBox ID="CustomerTelephoneValue" runat="server" /> </div> <div> <asp:Label ID="CustomerMobileLabel" runat="server" Text="Mobile" /> <asp:TextBox ID="CustomerMobileValue" runat="server" /> </div> <div> <asp:Label ID="CustomerFaxLabel" runat="server" Text="Fax" /> <asp:TextBox ID="CustomerFaxValue" runat="server" /> </div> <div> <asp:Label ID="CustomerEmailLabel" runat="server" Text="Email" /> <asp:TextBox ID="CustomerEmailValue" runat="server" /> </div> <div> <asp:Label ID="CustomerWebLabel" runat="server" Text="Web" /> <asp:TextBox ID="CustomerWebValue" runat="server" /> </div> </div> </div> <div class="update_button_field"> <asp:Button ID="UpdateContactDetailsButton" runat="server" Text="Update" onclick="UpdateContactDetailsButton_Click" /> </div> </ContentTemplate> </asp:UpdatePanel> Thanks in advance.

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• "Randomly" occurring errors...

  - by ClarkeyBoy

  Hi, My website has a setup whereby when the application starts a module called SiteContent is "created". This runs a clearup function which basically deletes any irrelevant data from the database, in case any has been left in there from previously run functions. The module has instances of Manager classes - namely RangeManager, CollectionManager, DesignManager. There are others but I will just use these as an example. Each Manager class contains an array of items - items may be of type Range, Collection or Design, whichever one is relevant. Data for each range is then read into an instance of Range, Collection or Design. I know this is basically duplicating data - not very efficient but its my final year project at the moment so I can always change it to use Linq or something similar later, when I am not pressured by the one month deadline. I have a form which, on clicking the Save button, saves data by calling SiteContent.RangeManager.Create(vars) or SiteContent.RangeManager.Update(Range As Range, vars) (or the equivalent for other manager classes, whichever one happens to be relevant). These functions call a stored procedure to insert or update in the relevant table. Classes Range, Collection and Design all have attributes such as Name, Description, Display and several others. When the Create or Update function is called, the Manager loops through all the other items to check if an item with the same name already exists. The Update function ensures that it does not compare the item being updated to itself. A custom exception (ItemAlreadyExistsException) is thrown if another item with the same name is found. For some weird reason, if I go into a Range, Collection or Design in edit mode, change something and try to update it, it occasionally doesnt update the item. When I say occasionally I mean every 3 - 4 page loads, sometimes more. I see absolutely no pattern in when or why it occurs. I have a try-catch statement which catches ItemAlreadyExistsException, and outputs "An item with this name already exists" when caught. Occasionally it will output this; other times it will not. Does anyone have any idea why this could happen? Maybe a mistake which someone has made and solved before? I used to have regular expressions in place that the names were compared to - I believe it was [a-zA-Z]{1, 100} (between 1 and 100 lower- or upper-case characters). For some reason the customer who I am developing the site for used to get errors saying its not in the correct format. Yet he could try the same text 5 minutes later and it would work fine. I am thinking this could well be the same problem, since both problems occur at random. Many thanks in advance. Regards, Richard Clarke Edit: After much time spent narrowing down the code, I have decided to wait till my brother, who has been a programmer for at least 8 years more than I have, to come down over Easter and get him to have a look at it. If he cant solve it then I will zip the files up and put them somewhere for people to access and have a go at. I narrowed it down literally to the minimum number of files possible, and it still occurs. It seems to be about every 10th time. Having said that, I force the manager classes to refresh every 10 page loads or 5 minutes (whichever one is sooner). I may look into this - this could be causing a problem. Basically each Manager contains an array of an object. This array is populated using data from the database. The Update function takes an instance of the item and the new values to be set for the object. If it happens to be a page load where the array is reset (ie the data is loaded freshly from the database) then the object instance with the same ID wont be the same instance as the one being passed in. This explains the fact that it throws an ItemAlreadyExistsException now and then. It all makes sense now the more I think about it. If I were to pass in the ID of the object to be altered, rather than the object itself, then it should work perfectly. I will answer the question if I solve it..

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• Windows 2008 RenderFarm Service: CreateProcessAsUser "Session 0 Isolation" and OpenGL

  - by holtavolt

  Hello, I have a legacy Windows server service and (spawned) application that works fine in XP-64 and W2K3, but fails on W2K8. I believe it is because of the new "Session 0 isolation " feature. (Note: As a StackOverflow newbie I'm being limited to one link in this post, so you'll need to scroll to bottom to lookup the links for '' items)* Consequently, I'm looking for code samples/security settings mojo that let you create a new process from a windows service for Windows 2008 Server such that I can restore (and possibly surpass) the previous behavior. I need a solution that: Creates the new process in a non-zero session to get around session-0 isolation restrictions (no access to graphics hardware from session 0) - the official MS line on this is: Because Session 0 is no longer a user session, services that are running in Session 0 do not have access to the video driver. This means that any attempt that a service makes to render graphics fails. Querying the display resolution and color depth in Session 0 reports the correct results for the system up to a maximum of 1920x1200 at 32 bits per pixel. The new process gets a windows station/desktop (e.g. winsta0/default) that can be used to create windows DCs. I've found a solution (that launches OK in an interactive session) for this here: *(Starting an Interactive Client Process in C++ - 2) The windows DC, when used as the basis for an *(OpenGL DescribePixelFormat enumeration - 3), is able to find and use the hardware-accelerated format (on a system appropriately equipped with OpenGL hardware.) Note that our current solution works OK on XP-64 and W2K3, except if a terminal services session is running (VNC works fine.) A solution that also allowed the process to work (i.e. run with OpenGL hardware acceleration even when a terminal services session is open) would be fanastic, although not required. I'm stuck at item #1 currently, and although there are some similar postings that discuss this (like *(this -4), and *(this - 5) - they are not suitable solutions, as there is no guarantee of a user session logged in already to "take" a session id from, nor am I running from a LocalSystem account (I'm running from a domain account for the service, for which I can adjust the privileges of, within reason, although I'd prefer to not have to escalate priorities to include SeTcbPrivileges.) For instance - here's a stub that I think should work, but always returns an error 1314 on the SetTokenInformation call (even though the AdjustTokenPrivileges returned no errors) I've used some alternate strategies involving "LogonUser" as well (instead of opening the existing process token), but I can't seem to swap out the session id. I'm also dubious about using the WTSActiveConsoleSessionId in all cases (for instance, if no interactive user is logged in) - although a quick test of the service running with no sessions logged in seemed to return a reasonable session value (1). I’ve removed error handling for ease of reading (still a bit messy - apologies) //Also tried using LogonUser(..) here OpenProcessToken(GetCurrentProcess(), TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES | TOKEN_ADJUST_SESSIONID | TOKEN_ADJUST_DEFAULT | TOKEN_ASSIGN_PRIMARY | TOKEN_DUPLICATE, &hToken) GetTokenInformation( hToken, TokenSessionId, &logonSessionId, sizeof(DWORD), &dwTokenLength ) DWORD consoleSessionId = WTSGetActiveConsoleSessionId(); /* Can't use this - requires very elevated privileges (LOCAL only, SeTcbPrivileges as well) if( !WTSQueryUserToken(consoleSessionId, &hToken)) ... */ DuplicateTokenEx(hToken, (TOKEN_QUERY | TOKEN_ADJUST_PRIVILEGES | TOKEN_ADJUST_SESSIONID | TOKEN_ADJUST_DEFAULT | TOKEN_ASSIGN_PRIMARY | TOKEN_DUPLICATE), NULL, SecurityIdentification, TokenPrimary, &hDupToken)) // Look up the LUID for the TCB Name privilege. LookupPrivilegeValue(NULL, SE_TCB_NAME, &tp.Privileges[0].Luid)) // Enable the TCB Name privilege in the token. tp.PrivilegeCount = 1; tp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; if (!AdjustTokenPrivileges(hDupToken, FALSE, &tp, sizeof(TOKEN_PRIVILEGES), NULL, 0)) { DisplayError("AdjustTokenPrivileges"); ... } if (GetLastError() == ERROR_NOT_ALL_ASSIGNED) { DEBUG( "Token does not have the necessary privilege.\n"); } else { DEBUG( "No error reported from AdjustTokenPrivileges!\n"); } // Never errors here DEBUG(LM_INFO, "Attempting setting of sessionId to: %d\n", consoleSessionId ); if (!SetTokenInformation(hDupToken, TokenSessionId, &consoleSessionId, sizeof(DWORD))) *** ALWAYS FAILS WITH 1314 HERE *** All the debug output looks fine up until the SetTokenInformation call - I see session 0 is my current process session, and in my case, it's trying to set session 1 (the result of the WTSGetActiveConsoleSessionId). (Note that I'm logged into the W2K8 box via VNC, not RDC) So - a the questions: Is this approach valid, or are all service-initiated processes restricted to session 0 intentionally? Is there a better approach (short of "Launch on logon" and auto-logon for the servers?) Is there something wrong with this code, or a different way to create a process token where I can swap out the session id to indicate I want to spawn the process in a new session? I did try using LogonUser instead of OpenProcessToken, but that didn't work either. (I don't care if all spawned processes share the same non-zero session or not at this point.) Any help much appreciated - thanks! (You need to replace the 'zttp' with 'http' - StackOverflow restriction on one link in my newbie post) 2: http://msdn.microsoft.com/en-us/library/aa379608(VS.85).aspx 3: http://www.opengl.org/resources/faq/technical/mswindows.htm 4: http://stackoverflow.com/questions/2237696/creating-a-process-in-a-non-zero-session-from-a-service-in-windows-2008-server 5: http://stackoverflow.com/questions/1602996/how-can-i-lauch-a-process-which-has-a-ui-from-windows-service

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• How to count each digit in a range of integers?

  - by Carlos Gutiérrez

  Imagine you sell those metallic digits used to number houses, locker doors, hotel rooms, etc. You need to find how many of each digit to ship when your customer needs to number doors/houses: 1 to 100 51 to 300 1 to 2,000 with zeros to the left The obvious solution is to do a loop from the first to the last number, convert the counter to a string with or without zeros to the left, extract each digit and use it as an index to increment an array of 10 integers. I wonder if there is a better way to solve this, without having to loop through the entire integers range. Solutions in any language or pseudocode are welcome. Edit: Answers review John at CashCommons and Wayne Conrad comment that my current approach is good and fast enough. Let me use a silly analogy: If you were given the task of counting the squares in a chess board in less than 1 minute, you could finish the task by counting the squares one by one, but a better solution is to count the sides and do a multiplication, because you later may be asked to count the tiles in a building. Alex Reisner points to a very interesting mathematical law that, unfortunately, doesn’t seem to be relevant to this problem. Andres suggests the same algorithm I’m using, but extracting digits with %10 operations instead of substrings. John at CashCommons and phord propose pre-calculating the digits required and storing them in a lookup table or, for raw speed, an array. This could be a good solution if we had an absolute, unmovable, set in stone, maximum integer value. I’ve never seen one of those. High-Performance Mark and strainer computed the needed digits for various ranges. The result for one millon seems to indicate there is a proportion, but the results for other number show different proportions. strainer found some formulas that may be used to count digit for number which are a power of ten. Robert Harvey had a very interesting experience posting the question at MathOverflow. One of the math guys wrote a solution using mathematical notation. Aaronaught developed and tested a solution using mathematics. After posting it he reviewed the formulas originated from Math Overflow and found a flaw in it (point to Stackoverflow :). noahlavine developed an algorithm and presented it in pseudocode. A new solution After reading all the answers, and doing some experiments, I found that for a range of integer from 1 to 10n-1: For digits 1 to 9, n*10(n-1) pieces are needed For digit 0, if not using leading zeros, n*10n-1 - ((10n-1) / 9) are needed For digit 0, if using leading zeros, n*10n-1 - n are needed The first formula was found by strainer (and probably by others), and I found the other two by trial and error (but they may be included in other answers). For example, if n = 6, range is 1 to 999,999: For digits 1 to 9 we need 6*105 = 600,000 of each one For digit 0, without leading zeros, we need 6*105 – (106-1)/9 = 600,000 - 111,111 = 488,889 For digit 0, with leading zeros, we need 6*105 – 6 = 599,994 These numbers can be checked using High-Performance Mark results. Using these formulas, I improved the original algorithm. It still loops from the first to the last number in the range of integers, but, if it finds a number which is a power of ten, it uses the formulas to add to the digits count the quantity for a full range of 1 to 9 or 1 to 99 or 1 to 999 etc. Here's the algorithm in pseudocode: integer First,Last //First and last number in the range integer Number //Current number in the loop integer Power //Power is the n in 10^n in the formulas integer Nines //Nines is the resut of 10^n - 1, 10^5 - 1 = 99999 integer Prefix //First digits in a number. For 14,200, prefix is 142 array 0..9 Digits //Will hold the count for all the digits FOR Number = First TO Last CALL TallyDigitsForOneNumber WITH Number,1 //Tally the count of each digit //in the number, increment by 1 //Start of optimization. Comments are for Number = 1,000 and Last = 8,000. Power = Zeros at the end of number //For 1,000, Power = 3 IF Power 0 //The number ends in 0 00 000 etc Nines = 10^Power-1 //Nines = 10^3 - 1 = 1000 - 1 = 999 IF Number+Nines <= Last //If 1,000+999 < 8,000, add a full set Digits[0-9] += Power*10^(Power-1) //Add 3*10^(3-1) = 300 to digits 0 to 9 Digits[0] -= -Power //Adjust digit 0 (leading zeros formula) Prefix = First digits of Number //For 1000, prefix is 1 CALL TallyDigitsForOneNumber WITH Prefix,Nines //Tally the count of each //digit in prefix, //increment by 999 Number += Nines //Increment the loop counter 999 cycles ENDIF ENDIF //End of optimization ENDFOR SUBROUTINE TallyDigitsForOneNumber PARAMS Number,Count REPEAT Digits [ Number % 10 ] += Count Number = Number / 10 UNTIL Number = 0 For example, for range 786 to 3,021, the counter will be incremented: By 1 from 786 to 790 (5 cycles) By 9 from 790 to 799 (1 cycle) By 1 from 799 to 800 By 99 from 800 to 899 By 1 from 899 to 900 By 99 from 900 to 999 By 1 from 999 to 1000 By 999 from 1000 to 1999 By 1 from 1999 to 2000 By 999 from 2000 to 2999 By 1 from 2999 to 3000 By 1 from 3000 to 3010 (10 cycles) By 9 from 3010 to 3019 (1 cycle) By 1 from 3019 to 3021 (2 cycles) Total: 28 cycles Without optimization: 2,235 cycles Note that this algorithm solves the problem without leading zeros. To use it with leading zeros, I used a hack: If range 700 to 1,000 with leading zeros is needed, use the algorithm for 10,700 to 11,000 and then substract 1,000 - 700 = 300 from the count of digit 1. Benchmark and Source code I tested the original approach, the same approach using %10 and the new solution for some large ranges, with these results: Original 104.78 seconds With %10 83.66 With Powers of Ten 0.07 A screenshot of the benchmark application: If you would like to see the full source code or run the benchmark, use these links: Complete Source code (in Clarion): http://sca.mx/ftp/countdigits.txt Compilable project and win32 exe: http://sca.mx/ftp/countdigits.zip Accepted answer noahlavine solution may be correct, but l just couldn’t follow the pseudo code, I think there are some details missing or not completely explained. Aaronaught solution seems to be correct, but the code is just too complex for my taste. I accepted strainer’s answer, because his line of thought guided me to develop this new solution.

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• PayPal IPN - having trouble accessing session data?

  - by Martin Bean

  Hello, all. I'm having issues with PayPal IPN integration where it seems I cannot get my solution to read session variables. Basically, in my shop module script, I store the customer's details as provided by PayPal to an orders table. However, I also wish to save products ordered in a transaction to a separate table linked by the order ID. However, it's the second part of the script that's not working, where I loop through the products in the session and then save them to the orders_products table. Is there a reason why the session data not being read? The code within shop.php is as follows: if ($paypal->validate_ipn()) { $name = $paypal->ipn_data['address_name']; $street_1 = $paypal->ipn_data['address_street']; $street_2 = ""; $city = $paypal->ipn_data['address_city']; $state = $paypal->ipn_data['address_state']; $zip = $paypal->ipn_data['address_zip']; $country = $paypal->ipn_data['address_country']; $txn_id = $paypal->ipn_data['txn_id']; $sql = "INSERT INTO orders (name, street_1, street_2, city, state, zip, country, txn_id) VALUES (:name, :street_1, :street_2, :city, :state, :zip, :country, :txn_id)"; $smt = $this->pdo->prepare($sql); $smt->bindParam(':name', $name, PDO::PARAM_STR); $smt->bindParam(':street_1', $street_1, PDO::PARAM_STR); $smt->bindParam(':street_2', $street_2, PDO::PARAM_STR); $smt->bindParam(':city', $city, PDO::PARAM_STR); $smt->bindParam(':state', $state, PDO::PARAM_STR); $smt->bindParam(':zip', $zip, PDO::PARAM_STR); $smt->bindParam(':country', $country, PDO::PARAM_STR); $smt->bindParam(':txn_id', $txn_id, PDO::PARAM_INT); $smt->execute(); // save products to orders relationship $order_id = $this->pdo->lastInsertId(); // $cart = $this->session->get('cart'); $cart = $this->session->get('cart'); foreach ($cart as $product_id => $item) { $quantity = $item['quantity']; $sql = "INSERT INTO orders_products (order_id, product_id, quantity) VALUES ('$order_id', '$product_id', '$quantity')"; $res = $this->pdo->query($sql); } $this->session->del('cart'); mail('[email protected]', 'IPN result', 'IPN was successful on wrestling-wear.com'); } else { mail('[email protected]', 'IPN result', 'IPN failed on wrestling-wear.com'); } And I'm using the PayPal IPN class for PHP as found here: http://www.micahcarrick.com/04-19-2005/php-paypal-ipn-integration-class.html, but the contents of the validate_ipn() method is as follows: public function validate_ipn() { $url_parsed = parse_url($this->paypal_url); $post_string = ''; foreach ($_POST as $field => $value) { $this->ipn_data[$field] = $value; $post_string.= $field.'='.urlencode(stripslashes($value)).'&'; } $post_string.= "cmd=_notify-validate"; // append IPN command // open the connection to PayPal $fp = fsockopen($url_parsed[host], "80", $err_num, $err_str, 30); if (!$fp) { // could not open the connection. If logging is on, the error message will be in the log $this->last_error = "fsockopen error no. $errnum: $errstr"; $this->log_ipn_results(false); return false; } else { // post the data back to PayPal fputs($fp, "POST $url_parsed[path] HTTP/1.1\r\n"); fputs($fp, "Host: $url_parsed[host]\r\n"); fputs($fp, "Content-type: application/x-www-form-urlencoded\r\n"); fputs($fp, "Content-length: ".strlen($post_string)."\r\n"); fputs($fp, "Connection: close\r\n\r\n"); fputs($fp, $post_string . "\r\n\r\n"); // loop through the response from the server and append to variable while (!feof($fp)) { $this->ipn_response.= fgets($fp, 1024); } fclose($fp); // close connection } if (eregi("VERIFIED", $this->ipn_response)) { // valid IPN transaction $this->log_ipn_results(true); return true; } else { // invalid IPN transaction; check the log for details $this->last_error = 'IPN Validation Failed.'; $this->log_ipn_results(false); return false; } }

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• Passing events in JMS

  - by sam

  I'm new in JMS. In my program, My Problem is that , I want to pass 4 events(classes) (callEvent, agentEvent, featureEvent, eventListenerExit) from the JMSQueue Program , who i m mention below. How can I do this? // (JmsSender.java) package com.apac.control.helper; import java.util.Calendar; import javax.jms.Queue; import javax.jms.QueueConnection; import javax.jms.QueueConnectionFactory; import javax.jms.QueueSender; import javax.jms.QueueSession; import javax.jms.Session; import javax.jms.TextMessage; import javax.naming.InitialContext; import com.apac.control.api.CallData; import com.apac.control.exception.CtiException; import library.cti.CtiEventDocument; import library.cti.impl.CtiEventDocumentImpl; public final class JmsSender { private QueueConnectionFactory factory; private Queue queue; private QueueConnection connection; private QueueSession session; private QueueSender sender; private String sessionId; private String deviceId; private String centerId; private String switchId; public JmsSender(String queueJndiName, String sessionId, String deviceId, String centerId, String switchId) throws CtiException { this.sessionId = sessionId; this.deviceId = deviceId; this.centerId = centerId; this.switchId = switchId; try { InitialContext ic = new InitialContext(); factory = (QueueConnectionFactory) ic.lookup("javax/jms/QueueConnectionFactory"); queue = (Queue) ic.lookup(queueJndiName); } catch (Exception e) { throw new CtiException("CTI. Error creating JmsSender.", e); } } public String getCenterId() { return centerId; } public String getDeviceId() { return deviceId; } public String getSwitchId() { return switchId; } public void connect() throws CtiException { try { connection = factory.createQueueConnection(); } catch (Exception e) { throw new CtiException("CTI000. Error connecting to cti queue."); } } public void close() throws CtiException { try { connection.close(); } catch (Exception e) { throw new CtiException("CTI000. Error closing queue."); } } public void send(String eventType, CallData call, long seqId) throws CtiException { // prepare the message CtiEventDocument ced = this.createBaseCtiDocument(); CtiEventDocument ce = ced.getCtiEvent(); ce.setSequenceId(seqId); ce.setCallId("" + call.getCallId()); ce.setUcid(call.getUCID()); ce.setEventType(eventType); ce.setDnisNumber(call.getDnisNumber()); ce.setAniNumber(call.getAniNumber()); ce.setApplicationData(call.getApplicationData()); ce.setQueueNumber(call.getQueueNumber()); ce.setCallingNumber(call.getCallingNumber()); if (call instanceof ManualCall) { ce.setManual("yes"); } try { sendMessage(ced.toString()); } catch (Exception e) { throw new CtiException("CTI051. Error sending message.", e); } } public void send(String eventType, String agentId, String agentMode, long seqId) throws CtiException { CtiEventDocument ced = this.createBaseCtiDocument(); CtiEventDocument ce = ced.getCtiEvent(); ce.setSequenceId(seqId); ce.setEventType(eventType); ce.setAgentId(agentId); ce.setAgentMode(agentMode); try { sendMessage(ced.toString()); } catch (Exception e) { throw new CtiException("CTI051. Error sending message.", e); } } public void sendError(String errCode, String errMsg) throws CtiException { CtiEventDocument ced = this.createBaseCtiDocument(); CtiEventDocument ce = ced.getCtiEvent(); ce.setEventType("Error"); ce.setErrorCode(errCode); ce.setErrorMessage(errMsg); try { sendMessage(ced.toString()); } catch (Exception e) { throw new CtiException("CTI051. Error sending message.", e); } } private CtiEventDocument createBaseCtiDocument() { CtiEventDocument ced = CtiEventDocument.Factory.newInstance(); CtiEventDocument ce = ced.addNewCtiEvent(); ce.setSessionId(sessionId); ce.setSwitchId(switchId); ce.setCenterId(centerId); ce.setDeviceId(deviceId); ce.setTime(Calendar.getInstance()); return ced; } // Synchronization protects session, which cannot be // accessed by more than one thread. We may more than // one thread here from Cti in some cases (for example // when customer is being transfered out and hangs the call // at the same time. synchronized void sendMessage(String msg) throws Exception { session = connection.createQueueSession(true, Session.AUTO_ACKNOWLEDGE); sender = session.createSender(queue); TextMessage txtMsg = session.createTextMessage(msg); sender.send(txtMsg); sender.close(); session.commit(); } }

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• HttpModule Init method is called several times - why?

  - by MartinF

  I was creating a http module and while debugging I noticed something which at first (at least) seemed like weird behaviour. When i set a breakpoint in the init method of the httpmodule i can see that the http module init method is being called several times even though i have only started up the website for debugging and made one single request (sometimes it is hit only 1 time, other times as many as 10 times). I know that I should expect several instances of the HttpApplication to be running and for each the http modules will be created, but when i request a single page it should be handled by a single http application object and therefore only fire the events associated once, but still it fires the events several times for each request which makes no sense - other than it must have been added several times within that httpApplication - which means it is the same httpmodule init method which is being called every time and not a new http application being created each time it hits my break point (see my code example at the bottom etc.). What could be going wrong here ? is it because i am debugging and set a breakpoint in the http module? It have noticed that it seems that if i startup the website for debugging and quickly step over the breakpoint in the httpmodule it will only hit the init method once and the same goes for the eventhandler. If I instead let it hang at the breakpoint for a few seconds the init method is being called several times (seems like it depends on how long time i wait before stepping over the breakpoint). Maybe this could be some build in feature to make sure that the httpmodule is initialised and the http application can serve requests , but it also seems like something that could have catastrophic consequences. This could seem logical, as it might be trying to finish the request and since i have set the break point it thinks something have gone wrong and try to call the init method again ? soo it can handle the request ? But is this what is happening and is everything fine (i am just guessing), or is it a real problem ? What i am specially concerned about is that if something makes it hang on the "production/live" server for a few seconds a lot of event handlers are added through the init and therefore each request to the page suddenly fires the eventhandler several times. This behaviour could quickly bring any site down. I have looked at the "original" .net code used for the httpmodules for formsauthentication and the rolemanagermodule etc but my code isnt any different that those modules uses. My code looks like this. public void Init(HttpApplication app) { if (CommunityAuthenticationIntegration.IsEnabled) { FormsAuthenticationModule formsAuthModule = (FormsAuthenticationModule) app.Modules["FormsAuthentication"]; formsAuthModule.Authenticate += new FormsAuthenticationEventHandler(this.OnAuthenticate); } } here is an example how it is done in the RoleManagerModule from the .NET framework public void Init(HttpApplication app) { if (Roles.Enabled) { app.PostAuthenticateRequest += new EventHandler(this.OnEnter); app.EndRequest += new EventHandler(this.OnLeave); } } Do anyone know what is going on? (i just hope someone out there can tell me why this is happening and assure me that everything is perfectly fine) :) UPDATE: I have tried to narrow down the problem and so far i have found that the Init method being called is always on a new object of my http module (contary to what i thought before). I seems that for the first request (when starting up the site) all of the HttpApplication objects being created and its modules are all trying to serve the first request and therefore all hit the eventhandler that is being added. I cant really figure out why this is happening. If i request another page all the HttpApplication's created (and their moduless) will again try to serve the request causing it to hit the eventhandler multiple times. But it also seems that if i then jump back to the first page (or another one) only one HttpApplication will start to take care of the request and everything is as expected - as long as i dont let it hang at a break point. If i let it hang at a breakpoint it begins to create new HttpApplication's objects and starts adding HttpApplications (more than 1) to serve/handle the request (which is already in process of being served by the HttpApplication which is currently stopped at the breakpoint). I guess or hope that it might be some intelligent "behind the scenes" way of helping to distribute and handle load and / or errors. But I have no clue. I hope some out there can assure me that it is perfectly fine and how it is supposed to be?

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• Java implementing Exception Handling

  - by user69514

  I am trying to implement an OutOfStockException for when the user attempts to buy more items than there are available. I'm not sure if my implementation is correct. Does this look OK to you? public class OutOfStockException extends Exception { public OutOfStockException(){ super(); } public OutOfStockException(String s){ super(s); } } This is the class where I need to test it: import javax.swing.JOptionPane; public class SwimItems { static final int MAX = 100; public static void main (String [] args) { Item [] items = new Item[MAX]; int numItems; numItems = fillFreebies(items); numItems += fillTaxable(items,numItems); numItems += fillNonTaxable(items,numItems); sellStuff(items, numItems); } private static int num(String which) { int n = 0; do { try{ n=Integer.parseInt(JOptionPane.showInputDialog("Enter number of "+which+" items to add to stock:")); } catch(NumberFormatException nfe){ System.out.println("Number Format Exception in num method"); } } while (n < 1 || n > MAX/3); return n; } private static int fillFreebies(Item [] list) { int n = num("FREEBIES"); for (int i = 0; i < n; i++) try{ list [i] = new Item(JOptionPane.showInputDialog("What freebie item will you give away?"), Integer.parseInt(JOptionPane.showInputDialog("How many do you have?"))); } catch(NumberFormatException nfe){ System.out.println("Number Format Exception in fillFreebies method"); } catch(ArrayIndexOutOfBoundsException e){ System.out.println("Array Index Out Of Bounds Exception in fillFreebies method"); } return n; } private static int fillTaxable(Item [] list, int number) { int n = num("Taxable Items"); for (int i = number ; i < n + number; i++) try{ list [i] = new TaxableItem(JOptionPane.showInputDialog("What taxable item will you sell?"), Double.parseDouble(JOptionPane.showInputDialog("How much will you charge (not including tax) for each?")), Integer.parseInt(JOptionPane.showInputDialog("How many do you have?"))); } catch(NumberFormatException nfe){ System.out.println("Number Format Exception in fillTaxable method"); } catch(ArrayIndexOutOfBoundsException e){ System.out.println("Array Index Out Of Bounds Exception in fillTaxable method"); } return n; } private static int fillNonTaxable(Item [] list, int number) { int n = num("Non-Taxable Items"); for (int i = number ; i < n + number; i++) try{ list [i] = new SaleItem(JOptionPane.showInputDialog("What non-taxable item will you sell?"), Double.parseDouble(JOptionPane.showInputDialog("How much will you charge for each?")), Integer.parseInt(JOptionPane.showInputDialog("How many do you have?"))); } catch(NumberFormatException nfe){ System.out.println("Number Format Exception in fillNonTaxable method"); } catch(ArrayIndexOutOfBoundsException e){ System.out.println("Array Index Out Of Bounds Exception in fillNonTaxable method"); } return n; } private static String listEm(Item [] all, int n, boolean numInc) { String list = "Items: "; for (int i = 0; i < n; i++) { try{ list += "\n"+ (i+1)+". "+all[i].toString() ; if (all[i] instanceof SaleItem) list += " (taxable) "; if (numInc) list += " (Number in Stock: "+all[i].getNum()+")"; } catch(ArrayIndexOutOfBoundsException e){ System.out.println("Array Index Out Of Bounds Exception in listEm method"); } catch(NullPointerException npe){ System.out.println("Null Pointer Exception in listEm method"); } } return list; } private static void sellStuff (Item [] list, int n) { int choice; do { try{ choice = Integer.parseInt(JOptionPane.showInputDialog("Enter item of choice: "+listEm(list, n, false))); } catch(NumberFormatException nfe){ System.out.println("Number Format Exception in sellStuff method"); } }while (JOptionPane.showConfirmDialog(null, "Another customer?")==JOptionPane.YES_OPTION); JOptionPane.showMessageDialog(null, "Remaining "+listEm(list, n, true)); } }

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• Architecture choice about representation of collections in Business Objects

  - by Rajarshi

  I have made certain choices in my architecture which I request the community to review and comment. I am breaking up the post in smaller sections to make it easier to understand the context and then suggest/comment. I am sorry that the post is long, but is required to explain the context. What am I building A typical business application where there are application users, security roles, business operation/action rights based on roles and several business modules like Stock Receive, Stock Transfer, Sale Order, Sale Invoice, Sale Return, Stock Audit etc. and several reports. The application is a WinForm application since it has a lot of rich and responsive UI requirements and has to operate in disconnected mode (with a local SQL Server), most of the time. What have I done I have built a framework - nothing to boast about, but just a set of libraries that serves the repetative requirements of my application, e.g. authentication, role based authorization, data access, validation, exception handling, logging, change status tracking, presentation model compliance and reasonable loose coupling between components. No, I have not written everything from scratch, you can say I have consolidated many things together like some concepts from CSLA, Martin Fowler for Presentation Model, blocks from Enterprise Library, Unity etc. to build a set of libraries that will help my developers be productive quickly without having to look up Google for many of the technical requirements. I have tried to keep the framework generic so that it can be used in typical business applications and also tried to follow some best practices that will support the same Business Objects to be used in an ASP.NET MVC environment also. My present architecture serves my objectives well, and have built several modules (on WinForm) without much trouble. The architecture also lent itself well to build some usable prototype on ASP.NET MVC with the same set of business objects, without changing a single line of code. My Dilemma I have used Custom Business Objects since that gives me a clearer OOP representation of the problem scope in my solution scope, and helps me visualize my entire solution as collection of objects with data and behavior rather than having a set of relational data (DataSet) and implement behaviours (business logic, validation) etc. separately. With rich databinding support in .NET 2.0 binding Custom Business Objects to UI was a breeze. Now while building my business objects, I am still in a dilemma about representation of collections in business objects. Currently I am using DataSets to represent collections while I have seen many suggestions to implement custom collections. For example, in my vision, a typical Sale Invoice Object will contain 'Sales Invoice Items' as a collection. Now theoritically, I can accept that the each 'Sales Invoice Item' should have its own behavior along with their data (ItemCode, Name, Qty, Price etc.) but typically managing of Sale Invoice Items in a Sale Invoice is handled by the Sale Invoice Object itself, e.g. adding/removing Items from collection. Additionally, we can also put business logic/rules for the Sales Invoice Items like "Qty should not be greater than the ordered qty", "Price should be max 10% above the price in Sale Order" etc. in the Sale Invoice object itself. With that kind of a vision, I felt that most business object child collections can be managed by the parent itself, including add/remove from collection as well and implementing business logic for the collection items, hence the collection items hold nothing but data. Additionally, typical collections are represented in UI in Grids, where ability to support DataBinding becomes very important for any collection. Implementing a custom collection, in that case would also mean, I have to implement robust DataBinding support as well, for the collection, which is of course time consuming. Now, considering child collection behaviors are implemented in the parent and the need for DataBinding of child collections, I chose DataSet to represent any child collection in my business objects. In the above example of Sale Invoice I will have 'Invoice Number', 'Date', 'Customer' etc. as attributes of the 'Sale Invoice' but 'InvoiceItems' as a DataSet. Of course, when I say DataSet, it is not a vanilla dataset but an extended DataSet that supports business rule validation and the same role based security model of my framework to allow/deny any business operation to rows/columns of the DataSet, automatically. This approach has allowed easier collection management and databinding in my business objects and my developers are able to deliver modules rapidly. Questions Do you feel that the approach is reasonable? Do you see any shortcomings of this approach? I am recently thinking of using 'Typed DataSets' as child collections, for easier representation in code, that will allow me to write 'currentInvoice.InvoiceItems' (for the DataTable) and 'invoiceItem.ProductCode' or 'invoiceItem.Qty', instead of 'drow["ProductCode"].ToString()' or '(int)drow["Qty"]' etc. Does this choice have any demerits? Thank you if you have read so far and a salute if you still have the Energy to answer.

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• Unaccounted for database size

  - by Nazadus

  I currently have a database that is 20GB in size. I've run a few scripts which show on each tables size (and other incredibly useful information such as index stuff) and the biggest table is 1.1 million records which takes up 150MB of data. We have less than 50 tables most of which take up less than 1MB of data. After looking at the size of each table I don't understand why the database shouldn't be 1GB in size after a shrink. The amount of available free space that SqlServer (2005) reports is 0%. The log mode is set to simple. At this point my main concern is I feel like I have 19GB of unaccounted for used space. Is there something else I should look at? Normally I wouldn't care and would make this a passive research project except this particular situation calls for us to do a backup and restore on a weekly basis to put a copy on a satellite (which has no internet, so it must be done manually). I'd much rather copy 1GB (or even if it were down to 5GB!) than 20GB of data each week. sp_spaceused reports the following: Navigator-Production 19184.56 MB 3.02 MB And the second part of it: 19640872 KB 19512112 KB 108184 KB 20576 KB while I've found a few other scripts (such as the one from two of the server database size questions here, they all report the same information either found above or below). The script I am using is from SqlTeam. Here is the header info: * BigTables.sql * Bill Graziano (SQLTeam.com) * graz@<email removed> * v1.11 The top few tables show this (table, rows, reserved space, data, index, unused, etc): Activity 1143639 131 MB 89 MB 41768 KB 1648 KB 46% 1% EventAttendance 883261 90 MB 58 MB 32264 KB 328 KB 54% 0% Person 113437 31 MB 15 MB 15752 KB 912 KB 103% 3% HouseholdMember 113443 12 MB 6 MB 5224 KB 432 KB 82% 4% PostalAddress 48870 8 MB 6 MB 2200 KB 280 KB 36% 3% The rest of the tables are either the same in size or smaller. No more than 50 tables. Update 1: - All tables use unique identifiers. Usually an int incremented by 1 per row. I've also re-indexed everything. I ran the dbcc shrink command as well as updating the usage before and after. And over and over. An interesting thing I found is that when I restarted the server and confirmed no one was using it (and no maintenance procs are running, this is a very new application -- under a week old) and when I went to run the shrink, every now and then it would say something about data changed. Googling yielded too few useful answers with the obvious not applying (it was 1am and I disconnected everyone, so it seems impossible that was really the case). The data was migrated via C# code which basically looked at another server and brought things over. The quantity of deletes, at this point in time, are probably under 50k in rows. Even if those rows were the biggest rows, that wouldn't be more than 100M I would imagine. When I go to shrink via the GUI it reports 0% available to shrink, indicating that I've already gotten it as small as it thinks it can go. Update 2: sp_spaceused 'Activity' yields this (which seems right on the money): Activity 1143639 134488 KB 91072 KB 41768 KB 1648 KB Fill factor was 90. All primary keys are ints. Here is the command I used to 'updateusage': DBCC UPDATEUSAGE(0); Update 3: Per Edosoft's request: Image 111975 2407773 19262184 It appears as though the image table believes it's the 19GB portion. I don't understand what this means though. Is it really 19GB or is it misrepresented? Update 4: Talking to a co-worker and I found out that it's because of the pages, as someone else here has also state the potential for that. The only index on the image table is a clustered PK. Is this something I can fix or do I just have to deal with it? The regular script shows the Image table to be 6MB in size. Update 5: I think I'm just going to have to deal with it after further research. The images have been resized to be roughly 2-5KB each and on a normal file system doesn't consume much space but on SqlServer it seems to consume considerably more. The real answer, in the long run, will likely be separating that table in to another partition or something similar.

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• I don't get prices with Amazon Product Advertising API

  - by Xarem

  I try to get prices of an ASIN number with the Amazon Product Advertising API. Code: $artNr = "B003TKSD8E"; $base_url = "http://ecs.amazonaws.de/onca/xml"; $params = array( 'AWSAccessKeyId' => self::API_KEY, 'AssociateTag' => self::API_ASSOCIATE_TAG, 'Version' => "2010-11-01", 'Operation' => "ItemLookup", 'Service' => "AWSECommerceService", 'Condition' => "All", 'IdType' => 'ASIN', 'ItemId' => $artNr); $params['Timestamp'] = gmdate("Y-m-d\TH:i:s.\\0\\0\\0\\Z", time()); $url_parts = array(); foreach(array_keys($params) as $key) $url_parts[] = $key . "=" . str_replace('%7E', '~', rawurlencode($params[$key])); sort($url_parts); $url_string = implode("&", $url_parts); $string_to_sign = "GET\necs.amazonaws.de\n/onca/xml\n" . $url_string; $signature = hash_hmac("sha256", $string_to_sign, self::API_SECRET, TRUE); $signature = urlencode(base64_encode($signature)); $url = $base_url . '?' . $url_string . "&Signature=" . $signature; $response = file_get_contents($url); $parsed_xml = simplexml_load_string($response); I think this should be correct - but I don't get offers in the response: SimpleXMLElement Object ( [OperationRequest] => SimpleXMLElement Object ( [RequestId] => ************************* [Arguments] => SimpleXMLElement Object ( [Argument] => Array ( [0] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => Condition [Value] => All ) ) [1] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => Operation [Value] => ItemLookup ) ) [2] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => Service [Value] => AWSECommerceService ) ) [3] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => ItemId [Value] => B003TKSD8E ) ) [4] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => IdType [Value] => ASIN ) ) [5] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => AWSAccessKeyId [Value] => ************************* ) ) [6] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => Timestamp [Value] => 2011-11-29T01:32:12.000Z ) ) [7] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => Signature [Value] => ************************* ) ) [8] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => AssociateTag [Value] => ************************* ) ) [9] => SimpleXMLElement Object ( [@attributes] => Array ( [Name] => Version [Value] => 2010-11-01 ) ) ) ) [RequestProcessingTime] => 0.0091540000000000 ) [Items] => SimpleXMLElement Object ( [Request] => SimpleXMLElement Object ( [IsValid] => True [ItemLookupRequest] => SimpleXMLElement Object ( [Condition] => All [IdType] => ASIN [ItemId] => B003TKSD8E [ResponseGroup] => Small [VariationPage] => All ) ) [Item] => SimpleXMLElement Object ( [ASIN] => B003TKSD8E [DetailPageURL] => http://www.amazon.de/Apple-iPhone-4-32GB-schwarz/dp/B003TKSD8E%3FSubscriptionId%3DAKIAI6NFQHK2DQIPRUEQ%26tag%3Dbanholzerme-20%26linkCode%3Dxm2%26camp%3D2025%26creative%3D165953%26creativeASIN%3DB003TKSD8E [ItemLinks] => SimpleXMLElement Object ( [ItemLink] => Array ( [0] => SimpleXMLElement Object ( [Description] => Add To Wishlist [URL] => http://www.amazon.de/gp/registry/wishlist/add-item.html%3Fasin.0%3DB003TKSD8E%26SubscriptionId%3DAKIAI6NFQHK2DQIPRUEQ%26tag%3Dbanholzerme-20%26linkCode%3Dxm2%26camp%3D2025%26creative%3D12738%26creativeASIN%3DB003TKSD8E ) [1] => SimpleXMLElement Object ( [Description] => Tell A Friend [URL] => http://www.amazon.de/gp/pdp/taf/B003TKSD8E%3FSubscriptionId%3DAKIAI6NFQHK2DQIPRUEQ%26tag%3Dbanholzerme-20%26linkCode%3Dxm2%26camp%3D2025%26creative%3D12738%26creativeASIN%3DB003TKSD8E ) [2] => SimpleXMLElement Object ( [Description] => All Customer Reviews [URL] => http://www.amazon.de/review/product/B003TKSD8E%3FSubscriptionId%3DAKIAI6NFQHK2DQIPRUEQ%26tag%3Dbanholzerme-20%26linkCode%3Dxm2%26camp%3D2025%26creative%3D12738%26creativeASIN%3DB003TKSD8E ) [3] => SimpleXMLElement Object ( [Description] => All Offers [URL] => http://www.amazon.de/gp/offer-listing/B003TKSD8E%3FSubscriptionId%3DAKIAI6NFQHK2DQIPRUEQ%26tag%3Dbanholzerme-20%26linkCode%3Dxm2%26camp%3D2025%26creative%3D12738%26creativeASIN%3DB003TKSD8E ) ) ) [ItemAttributes] => SimpleXMLElement Object ( [Manufacturer] => Apple Computer [ProductGroup] => CE [Title] => Apple iPhone 4 32GB schwarz ) ) ) ) Can someone please explain me why I don't get any price-information? Thank you very much

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• Trouble updating my datagrid in WPF

  - by wrigley06

  As the title indicates, I'm having trouble updating a datagrid in WPF. Basically what I'm trying to accomplish is a datagrid, that is connected to a SQL Server database, that updates automatically once a user enters information into a few textboxes and clicks a submit button. You'll notice that I have a command that joins two tables. The data from the Quote_Data table will be inserted by a different user at a later time. For now my only concern is getting the information from the textboxes and into the General_Info table, and from there into my datagrid. The code, which I'll include below compiles fine, but when I hit the submit button, nothing happens. This is the first application I've ever built working with a SQL Database so many of these concepts are new to me, which is why you'll probably look at my code and wonder what is he thinking. public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } public DataSet mds; // main data set (mds) private void Window_Loaded_1(object sender, RoutedEventArgs e) { try { string connectionString = Sqtm.Properties.Settings.Default.SqtmDbConnectionString; using (SqlConnection connection = new SqlConnection(connectionString)) { connection.Open(); //Merging tables General_Info and Quote_Data SqlCommand cmd = new SqlCommand("SELECT General_Info.Quote_ID, General_Info.Open_Quote, General_Info.Customer_Name," + "General_Info.OEM_Name, General_Info.Qty, General_Info.Quote_Num, General_Info.Fab_Drawing_Num, " + "General_Info.Rfq_Num, General_Info.Rev_Num, Quote_Data.MOA, Quote_Data.MOQ, " + "Quote_Data.Markup, Quote_Data.FOB, Quote_Data.Shipping_Method, Quote_Data.Freight, " + "Quote_Data.Vendor_Price, Unit_Price, Quote_Data.Difference, Quote_Data.Vendor_NRE_ET, " + "Quote_Data.NRE, Quote_Data.ET, Quote_Data.STI_NET, Quote_Data.Mfg_Time, Quote_Data.Delivery_Time, " + "Quote_Data.Mfg_Name, Quote_Data.Mfg_Location " + "FROM General_Info INNER JOIN dbo.Quote_Data ON General_Info.Quote_ID = Quote_Data.Quote_ID", connection); SqlDataAdapter da = new SqlDataAdapter(cmd); DataTable dt = new DataTable(); da.Fill(dt); MainGrid.ItemsSource = dt.DefaultView; mds = new DataSet(); da.Fill(mds, "General_Info"); MainGrid.DataContext = mds.Tables["General_Info"]; } } catch (Exception ex) { MessageBox.Show(ex.Message); } // renaming column names from the database so they are easier to read in the datagrid MainGrid.Columns[0].Header = "#"; MainGrid.Columns[1].Header = "Date"; MainGrid.Columns[2].Header = "Customer"; MainGrid.Columns[3].Header = "OEM"; MainGrid.Columns[4].Header = "Qty"; MainGrid.Columns[5].Header = "Quote Number"; MainGrid.Columns[6].Header = "Fab Drawing Num"; MainGrid.Columns[7].Header = "RFQ Number"; MainGrid.Columns[8].Header = "Rev Number"; MainGrid.Columns[9].Header = "MOA"; MainGrid.Columns[10].Header = "MOQ"; MainGrid.Columns[11].Header = "Markup"; MainGrid.Columns[12].Header = "FOB"; MainGrid.Columns[13].Header = "Shipping"; MainGrid.Columns[14].Header = "Freight"; MainGrid.Columns[15].Header = "Vendor Price"; MainGrid.Columns[16].Header = "Unit Price"; MainGrid.Columns[17].Header = "Difference"; MainGrid.Columns[18].Header = "Vendor NRE/ET"; MainGrid.Columns[19].Header = "NRE"; MainGrid.Columns[20].Header = "ET"; MainGrid.Columns[21].Header = "STINET"; MainGrid.Columns[22].Header = "Mfg. Time"; MainGrid.Columns[23].Header = "Delivery Time"; MainGrid.Columns[24].Header = "Manufacturer"; MainGrid.Columns[25].Header = "Mfg. Location"; } private void submitQuotebtn_Click(object sender, RoutedEventArgs e) { CustomerData newQuote = new CustomerData(); int quantity; quantity = Convert.ToInt32(quantityTxt.Text); string theDate = System.DateTime.Today.Date.ToString("d"); newQuote.OpenQuote = theDate; newQuote.CustomerName = customerNameTxt.Text; newQuote.OEMName = oemNameTxt.Text; newQuote.Qty = quantity; newQuote.QuoteNumber = quoteNumberTxt.Text; newQuote.FdNumber = fabDrawingNumberTxt.Text; newQuote.RfqNumber = rfqNumberTxt.Text; newQuote.RevNumber = revNumberTxt.Text; try { string insertConString = Sqtm.Properties.Settings.Default.SqtmDbConnectionString; using (SqlConnection insertConnection = new SqlConnection(insertConString)) { insertConnection.Open(); SqlDataAdapter adapter = new SqlDataAdapter(Sqtm.Properties.Settings.Default.SqtmDbConnectionString, insertConnection); SqlCommand updateCmd = new SqlCommand("UPDATE General_Info " + "Quote_ID = @Quote_ID, " + "Open_Quote = @Open_Quote, " + "OEM_Name = @OEM_Name, " + "Qty = @Qty, " + "Quote_Num = @Quote_Num, " + "Fab_Drawing_Num = @Fab_Drawing_Num, " + "Rfq_Num = @Rfq_Num, " + "Rev_Num = @Rev_Num " + "WHERE Quote_ID = @Quote_ID"); updateCmd.Connection = insertConnection; System.Data.SqlClient.SqlParameterCollection param = updateCmd.Parameters; // // Add new SqlParameters to the command. // param.AddWithValue("Open_Quote", newQuote.OpenQuote); param.AddWithValue("Customer_Name", newQuote.CustomerName); param.AddWithValue("OEM_Name", newQuote.OEMName); param.AddWithValue("Qty", newQuote.Qty); param.AddWithValue("Quote_Num", newQuote.QuoteNumber); param.AddWithValue("Fab_Drawing_Num", newQuote.FdNumber); param.AddWithValue("Rfq_Num", newQuote.RfqNumber); param.AddWithValue("Rev_Num", newQuote.RevNumber); adapter.UpdateCommand = updateCmd; adapter.Update(mds.Tables[0]); mds.AcceptChanges(); } } catch (Exception ex) { MessageBox.Show(ex.Message); } } Thanks in advance to anyone who can help, I really appreciate it, Andrew

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• Accessing py2exe program over network in Windows 98 throws ImportErrors

  - by darvids0n

  I'm running a py2exe-compiled python program from one server machine on a number of client machines (mapped to a network drive on every machine, say W:). For Windows XP and later machines, have so far had zero problems with Python picking up W:\python23.dll (yes, I'm using Python 2.3.5 for W98 compatibility and all that). It will then use W:\zlib.pyd to decompress W:\library.zip containing all the .pyc files like os and such, which are then imported and the program runs no problems. The issue I'm getting is on some Windows 98 SE machines (note: SOME Windows 98 SE machines, others seem to work with no apparent issues). What happens is, the program runs from W:, the W:\python23.dll is, I assume, found (since I'm getting Python ImportErrors, we'd need to be able to execute a Python import statement), but a couple of things don't work: 1) If W:\library.zip contains the only copy of the .pyc files, I get ZipImportError: can't decompress data; zlib not available (nonsense, considering W:\zlib.pyd IS available and works fine with the XP and higher machines on the same network). 2) If the .pyc files are actually bundled INSIDE the python exe by py2exe, OR put in the same directory as the .exe, OR put into a named subdirectory which is then set as part of the PYTHONPATH variable (e.g W:\pylib), I get ImportError: no module named os (os is the first module imported, before sys and anything else). Come to think of it, sys.path wouldn't be available to search if os was imported before it maybe? I'll try switching the order of those imports but my question still stands: Why is this a sporadic issue, working on some networks but not on others? And how would I force Python to find the files that are bundled inside the very executable I run? I have immediate access to the working Windows 98 SE machine, but I only get access to the non-working one (a customer of mine) every morning before their store opens. Thanks in advance! EDIT: Okay, big step forward. After debugging with PY2EXE_VERBOSE, the problem occurring on the specific W98SE machine is that it's not using the right path syntax when looking for imports. Firstly, it doesn't seem to read the PYTHONPATH environment variable (there may be a py2exe-specific one I'm not aware of, like PY2EXE_VERBOSE). Secondly, it only looks in one place before giving up (if the files are bundled inside the EXE, it looks there. If not, it looks in library.zip). EDIT 2: In fact, according to this, there is a difference between the sys.path in the Python interpreter and that of Py2exe executables. Specifically, sys.path contains only a single entry: the full pathname of the shared code archive. Blah. No fallbacks? Not even the current working directory? I'd try adding W:\ to PATH, but py2exe doesn't conform to any sort of standards for locating system libraries, so it won't work. Now for the interesting bit. The path it tries to load atexit, os, etc. from is: W:\\library.zip\<module>.<ext> Note the single slash after library.zip, but the double slash after the drive letter (someone correct me if this is intended and should work). It looks like if this is a string literal, then since the slash isn't doubled, it's read as an (invalid) escape sequence and the raw character is printed (giving W:\library.zipos.pyd, W:\library.zipos.dll, ... instead of with a slash); if it is NOT a string literal, the double slash might not be normpath'd automatically (as it should be) and so the double slash confuses the module loader. Like I said, I can't just set PYTHONPATH=W:\\library.zip\\ because it ignores that variable. It may be worth using sys.path.append at the start of my program but hard-coding module paths is an absolute LAST resort, especially since the problem occurs in ONE configuration of an outdated OS. Any ideas? I have one, which is to normpath the sys.path.. pity I need os for that. Another is to just append os.getenv('PATH') or os.getenv('PYTHONPATH') to sys.path... again, needing the os module. The site module also fails to initialise, so I can't use a .pth file. I also recently tried the following code at the start of the program: for pth in sys.path: fErr.write(pth) fErr.write(' to ') pth.replace('\\\\','\\') # Fix Windows 98 pathing issues fErr.write(pth) fErr.write('\n') But it can't load linecache.pyc, or anything else for that matter; it can't actually execute those commands from the looks of things. Is there any way to use built-in functionality which doesn't need linecache to modify the sys.path dynamically? Or am I reduced to hard-coding the correct sys.path?

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• Merging elements inside a xml.etree.ElementTree

  - by theAlse

  I have a huge test data like the one provided below (and yes I have no control over this data). Each line is actually 6 parts and I need to generate an XML based on this data. Nav;Basic;Dest;Smoke;No;Yes; Nav;Dest;Recent;Regg;No;Yes; Nav;Dest;Favourites;Regg;No;Yes; ... Nav;Dest using on board;By POI;Smoke;No;Yes; Nav;Dest using on board;Other;Regg;No;Yes; The first 3 elements on each line denotes "test suites"-XML element and the last 3 element should create a "test case"-XML element. I have successfully converted it into a XML using the following code: # testsuite (root) testsuite = ET.Element('testsuite') testsuite.set("name", "Tests") def _create_testcase_tag(elem): global testsuite level1, level2, level3, elem4, elem5, elem6 = elem # -- testsuite (level1) testsuite_level1 = ET.SubElement(testsuite, "testsuite") testsuite_level1.set("name", level1) # -- testsuite (level2) testsuite_level2 = ET.SubElement(testsuite_level1, "testsuite") testsuite_level2.set("name", level2) # -- testsuite (level3) testsuite_level2 = ET.SubElement(testsuite_level2, "testsuite") testsuite_level2.set("name", level3) # -- testcase testcase = ET.SubElement(testsuite_level2, "testcase") testcase.set("name", "TBD") summary = ET.SubElement(testcase, "summary") summary.text = "Test Type= %s, Automated= %s, Available=%s" %(elem4, elem5, elem6) with open(input_file) as in_file: for line_number, a_line in enumerate(in_file): try: parameters = a_line.split(';') if len(parameters) >= 6: level1 = parameters[0].strip() level2 = parameters[1].strip() level3 = parameters[2].strip() elem4 = parameters[3].strip() elem5 = parameters[4].strip() elem6 = parameters[5].strip() lines_as_list.append((level1, level2, level3, elem4, elem5, elem6)) except ValueError: pass lines_as_list.sort() for elem in lines_as_list: _create_testcase_tag(elem) output_xml = ET.ElementTree(testsuite) ET.ElementTree.write(output_xml, output_file, xml_declaration=True, encoding="UTF-8") The above code generates an XML like this: <testsuite name="Tests"> <testsuite name="Nav"> <testsuite name="Basic navigation"> <testsuite name="Set destination"> <testcase name="TBD"> <summary>Test Type= Smoke test Automated= No, Available=Yes</summary> </testcase> </testsuite> </testsuite> </testsuite> <testsuite name="Nav"> <testsuite name="Set destination"> <testsuite name="Recent"> <testcase name="TBD"> <summary> Test Type= Reggression test Automated= No, Available=Yes </summary> </testcase> </testsuite> </testsuite> </testsuite> </testsuite> ... This is all correct, but as you can see I have created a whole tree for each line and that is not what I need. I need to combine e.g. all testsuite with the same name into one testsuite and also perform that recursively. So the XML looks like this instead: <testsuite name="Tests"> <testsuite name="Nav"> <testsuite name="Basic navigation"> <testsuite name="Set destination"> <testcase name="TBD"> <summary>Test Type= Smoke test Automated= No, Available=Yes</summary> </testcase> </testsuite> <testsuite name="Recent"> <testcase name="TBD"> <summary> Test Type= Reggression test Automated= No, Available=Yes </summary> </testcase> </testsuite> </testsuite> </testsuite> </testsuite> I hope you can understand what I mean, but level1, level2 and level3 should be unique with testcases inside. How should I do this? Please do not suggest the use of any external libraries! I can not install new libraries in customer site. xml.etree.ElementTree is all I have. Thanks

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• php send a file attachment inbuild script

  - by abhi

  hello iam new to php please let me know is any script or link for ( php script to send mail with file multiple attachments) and the html form also to how to connect this form or any inbuilt script so that i can upload to my server. i already try in many ways by coping the codes and pasting them and changing there path but still it get many errors so please let me know if there inbuilt script easily upload to my server <?php if($_GET['name']== '' || $_GET['email']=='' || $_GET['email']=='' || $_GET['Message']=='' ) { ?> <form action="check3.php" method="get" name="frmPhone"> <fieldset> <legend style="color:#000">Contact </legend> <table width="100%"> <tr> <td width="29%"> <label for="name" <?php if(isset($_GET['Submit']) && $_GET['name']=='') echo "style='color:red'"; ?>>Name* </label> </td> <td width="71%"> <input id="name" name="name" type="text" style="width:50%" value=" <?php echo $_GET['name']; ?>"/> </td> </tr> <tr> <td> <label for=" email" <?php if(isset($_GET['Submit']) && $_GET['email']=='') echo "style='color:red'"; ?>>Email* </label> </td> <td> <input id="email" name="email" type="text" style="width:50%" value=" <?php echo $_GET['email']; ?>"/> </td> </tr> </table> </fieldset> <fieldset> <legend style="color:#000">Inquiry </legend> <table width="100%"> <tr> <td width="41%" valign="top"> <label for="Message" <?php if(isset($_GET['Submit']) && $_GET['Message']=='') echo "style='color:red'"; ?>>Message*</label> </td> <td width="59%"> <textarea name="Message" rows="5" style="width:90%" id="Message"> <?php echo $_GET['Message']; ?> </textarea> </td><div align="center">Photo <input name="photo" type="file" size="35" /> </div></td> </tr> <tr> <input name="Submit" type="submit" value="Submit" /> </form> </td> </td> </form> </tr> <?php } else { $to = '[email protected]'; $subject = 'Customer Information'; $message = ' Name: '.$_GET['name'].' Email Address: '.$_GET['email'].' Message: '.$_GET['Message']; $headers = 'From:'.$_GET['email']; mail($to, $subject, $message, $headers); $connection=mysql_connect("db2173.perfora.net", "dbo311409166", "malani2002") or die(mysql_error()); $query = mysql_query("INSERT INTO `feedback` ( `name` , `email` , `Message` , `photo` ) VALUES ('".$_GET['name']."', '".$_GET['email']."', '".$_GET['Message']."')"); define ("MAX_SIZE","75"); if(isset($_FILES['photo']['name']) && $_FILES['photo']['name']<>"") { $typ = $_FILES['photo']['type']; if($typ == "image/g if" || $typ == "image/png" || $typ == "image/jpeg" || $typ == "image/pg if" || $typ == "image/ppng" || $typ =="image/JPEG") { $uploaddir = "contacts/"; $uploadimages = $uploaddir.basename($_FILES['photo']['name']); if(move_uploaded_file($_FILES['photo']['tmp_name'], $uploadimages)) { echo "File successfully copied"; $sql="INSERT INTO contacts (Photo, Beschrijving) VALUES ('$uploadimages', '$_POST[images]')"; if (!mysql_query($sql,$con)) { die('Error: ' . mysql_error()); mysql_close($con); } } else {echo "Copy unsuccessful"; } } else { echo "Incorrect file type"; } } else { echo "No file selected"; } echo "Thank you! "; } ?> thanks and regards abhi

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• how to use multiple tab controls, and to be able to call a selected tab control with buttons.

  - by mojotaker

  Please I am trying to assign each button on the left its own Tab control. That is for example, when the Intake form button is pushed, it will have its own set of tabs (its own tabcontrols) am i supposed to place multiple tab controls on the artboard, or is there a way to programatically change the names of the tabs, and there contents, when a button is pushed on the left ? thank you in advance. and here is a link hxxp://img709.imageshack.us/img709/554/tabcontrol.gif here is the code so far <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" x:Class="service.MainWindow" x:Name="Window" Title="MainWindow" Width="687" Height="480" mc:Ignorable="d"> <Window.Resources> <Storyboard x:Key="OnLoaded1"/> </Window.Resources> <Window.Triggers> <EventTrigger RoutedEvent="FrameworkElement.Loaded"> <BeginStoryboard Storyboard="{StaticResource OnLoaded1}"/> </EventTrigger> </Window.Triggers> <Grid x:Name="LayoutRoot" Margin="0,0,-16,1"> <Grid.ColumnDefinitions> <ColumnDefinition Width="0*"/> <ColumnDefinition/> </Grid.ColumnDefinitions> <DockPanel Margin="8,8,0,7" LastChildFill="False" Grid.Column="1" HorizontalAlignment="Left" Width="660"> <Menu VerticalAlignment="Top" Width="657" Height="32"> <MenuItem x:Name="file" Header="File"/> <MenuItem x:Name="edit" Header="Edit"> <MenuItem Width="100" Height="100" Header="MenuItem"/> </MenuItem> <MenuItem x:Name="view" Header="View"/> <MenuItem x:Name="preferences" Header="Preferences"/> <MenuItem x:Name="help" Header="Help"/> </Menu> </DockPanel> <TabControl x:Name="tabwin" Margin="137.224,46,19,7" Grid.Column="1"> <TabItem x:Name="intakeformsub" Header="Elegibility Form"> <Grid HorizontalAlignment="Left" Width="490"/> </TabItem> <TabItem Header="TabItem"> <Grid/> </TabItem> <TabItem Header="TabItem"> <Grid/> </TabItem> <TabItem Header="TabItem"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="0.567*"/> <ColumnDefinition Width="0.433*"/> </Grid.ColumnDefinitions> </Grid> </TabItem> <TabItem Header="TabItem"> <Grid/> </TabItem> <TabItem Header="TabItem"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition Width="0.735*"/> <ColumnDefinition Width="0.265*"/> </Grid.ColumnDefinitions> </Grid> </TabItem> <TabItem Header="TabItem"> <Grid/> </TabItem> <TabItem Header="TabItem"> <Grid/> </TabItem> </TabControl> <Grid x:Name="___buttontab" Margin="11.205,61,0,0" Grid.Column="1" HorizontalAlignment="Left" Width="122.019" VerticalAlignment="Top" Height="276"> <Button VerticalAlignment="Top" Height="36" Content="Button"/> <Button Margin="0,40,0,0" Content="Oasis Assessments" VerticalAlignment="Top" Height="36"/> <Button Margin="0,80,0,0" VerticalAlignment="Top" Height="36" Content="Plan of Care"/> <Button Margin="0,120,0,0" VerticalAlignment="Top" Height="36" Content="Medication Profile" RenderTransformOrigin="0.421,5.556"/> <Button Margin="0,0,0,80" VerticalAlignment="Bottom" Height="36" Content="Clinical Notes"/> <Button Margin="0,0,0,40" VerticalAlignment="Bottom" Height="36" Content="Infection Control"/> <Button x:Name="intakeformbtn" VerticalAlignment="Top" Height="36" Content="Intake Form" Click="intakeform"> <Button.BindingGroup> <BindingGroup/> </Button.BindingGroup> </Button> <Button VerticalAlignment="Bottom" Height="36" Content="Discharge Summary"/> </Grid> <ProgressBar HorizontalAlignment="Left" Margin="8,0,0,7" VerticalAlignment="Bottom" Width="104.795" Height="19" Grid.Column="1"/> </Grid> </Window>

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• Fetching value from collection

  - by user334119

  public string GetProductVariantImageUrl(ShoppingCartItem shoppingCartItem) { string pictureUrl = String.Empty; ProductVariant productVariant = shoppingCartItem.ProductVariant; ProductVariantAttributeValueCollection pvaValues = shoppingCartItem.Attributes; [here the count comes 0]{case1} } public string GetAttributeDescription(ShoppingCartItem shoppingCartItem) { string result = string.Empty; ProductVariant productVariant = shoppingCartItem.ProductVariant; if (productVariant != null) { ProductVariantAttributeValueCollection pvaValues = shoppingCartItem.Attributes;[here count is 1] } } WHY am i not able to get count as 1 for the case1. /// <summary> /// Represents a shopping cart item /// </summary> public class ShoppingCartItem : BaseEntity { #region Fields private ProductVariant _cachedProductVariant; private ProductVariantAttributeValueCollection _cachedPvaValues; #endregion #region Ctor /// <summary> /// Creates a new instance of the shopping cart class /// </summary> public ShoppingCartItem() { } #endregion #region Properties /// <summary> /// Gets or sets the shopping cart item identifier /// </summary> public int ShoppingCartItemID { get; set; } /// <summary> /// Gets or sets the shopping cart type identifier /// </summary> public int ShoppingCartTypeID { get; set; } /// <summary> /// Gets or sets the customer session identifier /// </summary> public Guid CustomerSessionGUID { get; set; } /// <summary> /// Gets or sets the product variant identifier /// </summary> public int ProductVariantID { get; set; } /// <summary> /// Gets or sets the product variant attribute identifiers /// </summary> public List<int> AttributeIDs { get; set; } /// <summary> /// Gets or sets the text option /// </summary> public string TextOption { get; set; } /// <summary> /// Gets or sets the quantity /// </summary> public int Quantity { get; set; } /// <summary> /// Gets or sets the date and time of instance creation /// </summary> public DateTime CreatedOn { get; set; } /// <summary> /// Gets or sets the date and time of instance update /// </summary> public DateTime UpdatedOn { get; set; } #endregion #region Custom Properties /// <summary> /// Gets the log type /// </summary> public ShoppingCartTypeEnum ShoppingCartType { get { return (ShoppingCartTypeEnum)ShoppingCartTypeID; } } /// <summary> /// Gets the product variant /// </summary> public ProductVariant ProductVariant { get { if (_cachedProductVariant == null) { _cachedProductVariant = ProductManager.GetProductVariantByID(ProductVariantID); } return _cachedProductVariant; } } /// <summary> /// Gets the product variant attribute values /// </summary> public ProductVariantAttributeValueCollection Attributes { get { if (_cachedPvaValues == null) { ProductVariantAttributeValueCollection pvaValues = new ProductVariantAttributeValueCollection(); foreach (int attributeID in this.AttributeIDs) { ProductVariantAttributeValue pvaValue = ProductAttributeManager.GetProductVariantAttributeValueByID(attributeID); if (pvaValue != null) pvaValues.Add(pvaValue); } _cachedPvaValues = pvaValues; } return _cachedPvaValues; } } /// <summary> /// Gets the total weight /// </summary> public decimal TotalWeigth { get { decimal totalWeigth = decimal.Zero; ProductVariant productVariant = ProductVariant; if (productVariant != null) { decimal attributesTotalWeight = decimal.Zero; foreach (ProductVariantAttributeValue pvaValue in this.Attributes) { attributesTotalWeight += pvaValue.WeightAdjustment; } decimal unitWeight = productVariant.Weight + attributesTotalWeight; totalWeigth = unitWeight * Quantity; } return totalWeigth; } } /// <summary> /// Gets a value indicating whether the shopping cart item is free shipping /// </summary> public bool IsFreeShipping { get { ProductVariant productVariant = this.ProductVariant; if (productVariant != null) return productVariant.IsFreeShipping; return true; } }

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• Subset sum problem

  - by MadBoy

  I'm having a problem with counting which is continuation of this question. I am not really a math person so it's really hard for me to figure out this subset sum problem which was suggested as resolution. I'm having 4 ArrayList in which I hold data: alId, alTransaction, alNumber, alPrice Type | Transaction | Number | Price 8 | Buy | 95.00000000 | 305.00000000 8 | Buy | 126.00000000 | 305.00000000 8 | Buy | 93.00000000 | 306.00000000 8 | Transfer out | 221.00000000 | 305.00000000 8 | Transfer in | 221.00000000 | 305.00000000 8 | Sell | 93.00000000 | 360.00000000 8 | Sell | 95.00000000 | 360.00000000 8 | Sell | 126.00000000 | 360.00000000 8 | Buy | 276.00000000 | 380.00000000 In the end I'm trying to get what's left for customer and what's left I put into 3 array lists: alNew (corresponds to alNumber), alNewPoIle (corresponds to alPrice), and alNewCo (corrseponds to alID) ArrayList alNew = new ArrayList(); ArrayList alNewPoIle = new ArrayList(); ArrayList alNewCo = new ArrayList(); for (int i = 0; i < alTransaction.Count; i++) { string tempAkcjeCzynnosc = (string) alTransaction[i]; string tempAkcjeInId = (string) alID[i]; decimal varAkcjeCena = (decimal) alPrice[i]; decimal varAkcjeIlosc = (decimal) alNumber[i]; int index; switch (tempAkcjeCzynnosc) { case "Transfer out": case "Sell": index = alNew.IndexOf(varAkcjeIlosc); if (index != -1) { alNew.RemoveAt(index); alNewPoIle.RemoveAt(index); alNewCo.RemoveAt(index); } else { ArrayList alTemp = new ArrayList(); decimal varAkcjeSuma = 0; for (int j = 0; j < alNew.Count; j ++) { string akcjeInId = (string) alNewCo[j]; decimal akcjeCena = (decimal) alNewPoIle[j]; decimal akcjeIlosc = (decimal) alNew[j]; if (tempAkcjeInId == akcjeInId && akcjeCena == varAkcjeCena) { alTemp.Add(j); varAkcjeSuma = varAkcjeSuma + akcjeIlosc; } } if (varAkcjeSuma == varAkcjeIlosc) { for (int j = alTemp.Count -1 ; j >=0 ; j --) { int tempIndex = (int) alTemp[j]; alNew.RemoveAt(tempIndex); alNewPoIle.RemoveAt(tempIndex); alNewCo.RemoveAt(tempIndex); } } } break; case "Transfer In": case "Buy": alNew.Add(varAkcjeIlosc); alNewPoIle.Add(varAkcjeCena); alNewCo.Add(tempAkcjeInId); break; } } Basically I'm adding and removing things from Array depending on Transaction Type, Transaction ID and Numbers. I'm adding numbers to ArrayList like 156, 340 (when it is TransferIn or Buy) etc and then i remove them doing it like 156, 340 (when it's TransferOut, Sell). My solution works for that without a problem. The problem I have is that for some old data employees were entering sum's like 1500 instead of 500+400+100+500. How would I change it so that when there's Sell/TransferOut or Buy/Transfer In and there's no match inside ArrayList it should try to add multiple items from thatArrayList and find elements that combine into aggregate. Inside my code I tried to resolve that problem with simple summing everything when there's no match (index == 1) if (index != -1) { alNew.RemoveAt(index); alNewPoIle.RemoveAt(index); alNewCo.RemoveAt(index); } else { ArrayList alTemp = new ArrayList(); decimal varAkcjeSuma = 0; for (int j = 0; j < alNew.Count; j ++) { string akcjeInId = (string) alNewCo[j]; decimal akcjeCena = (decimal) alNewPoIle[j]; decimal akcjeIlosc = (decimal) alNew[j]; if (tempAkcjeInId == akcjeInId && akcjeCena == varAkcjeCena) { alTemp.Add(j); varAkcjeSuma = varAkcjeSuma + akcjeIlosc; } } if (varAkcjeSuma == varAkcjeIlosc) { for (int j = alTemp.Count -1 ; j >=0 ; j --) { int tempIndex = (int) alTemp[j]; alNew.RemoveAt(tempIndex); alNewPoIle.RemoveAt(tempIndex); alNewCo.RemoveAt(tempIndex); } } But it only works if certain conditions are met, and fails for the rest.

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• SSL confirmation dialog popup auto closes in IE8 when re-accessing a JNLP file

  - by haylem

  I'm having this very annoying problem to troubleshoot and have been going at it for way too many days now, so have a go at it. The Environment We have 2 app-servers, which can be located on either the same machine or 2 different machines, and use the same signing certificate, and host 2 different web-apps. Though let's say, for the sake of our study case here, that they are on the same physical machine. So, we have: https://company.com/webapp1/ https://company.com/webapp2/ webapp1 is GWT-based rich-client which contains on one of its screens a menu with an item that is used to invoke a Java WebStart Client located on webapp2. It does so by performing a simple window.open call via this GWT call: Window.open("https://company.com/webapp2/app.jnlp", "_blank", null); Expected Behavior User merrilly goes to webapp1 User navigates to menu entry to start the WebStart app and clicks on it browser fires off a separate window/dialog which, depending on the browser and its security settings, will: request confirmation to navigate to this secure site, directly download the file, and possibly auto-execute a javaws process if there's a file association, otherwise the user can simply click on the file and start the app (or go about doing whatever it takes here). If you close the app, close the dialog, and re-click the menu entry, the same thing should happen again. Actual Behavior On Anything but God-forsaken IE 8 (Though I admit there's also all the god-forsaken pre-IE8 stuff, but the Requirements Lords being merciful we have already recently managed to make them drop these suckers. That was close. Let's hold hands and say a prayer of gratitude.) Stuff just works. JNLP gets downloaded, app executes just fine, you can close the app and re-do all the steps and it will restart happily. People rejoice. Puppies are safe and play on green hills in the sunshine. Developers can go grab a coffee and move on to more meaningful and rewarding tasks, like checking out on SO questions. Chrome doesn't want to execute the JNLP, but who cares? Customers won't get RSI from clicking a file every other week. On God-forsaken IE8 On the first visit, the dialog opens and requests confirmation for the user to continue to webapp2, though it could be unsafe (here be dragons, I tell you). The JNLP downloads and auto-opens, the app start. Your breathing is steady and slow. You close the app, close that SSL confirmation dialog, and re-click the menu entry. The dialog opens and auto-closes. Nothing starts, the file wasn't downloaded to any known location and Fiddler just reports the connection was closed. If you close IE and reach that menu item to click it again, it is now back to working correctly. Until you try again during the same session, of course. Your heart-rate goes up, you get some more coffee to make matters worse, and start looking for plain tickets online and a cheap but heavy golf-club on an online auction site to go clubbing baby polar seals to avenge your bloodthirst, as the gates to the IE team in Redmond are probably more secured than an ice block, as one would assume they get death threats often. Plus, the IE9 and IE10 teams are already hard at work fxing the crap left by their predecessors, so maybe you don't want to be too hard on them, and you don't have money to waste on a PI to track down the former devs responsible for this mess. Added Details I have come across many problems with IE8 not downloading files over SSL when it uses a no-cache header. This was indeed one of our problems, which seems to be worked out now. It downloads files fine, webapp2 uses the following headers to serve the JNLP file: response.setHeader("Cache-Control", "private, must-revalidate"); // IE8 happy response.setHeader("Pragma", "private"); // IE8 happy response.setHeader("Expires", "0"); // IE8 happy response.setHeader("Access-Control-Allow-Origin", "*"); // allow to request via cross-origin AJAX response.setContentType("application/x-java-jnlp-file"); // please exec me As you might have inferred, we get some confirmation dialog because there's something odd with the SSL certificate. Unfortunately I have no control over that. Assuming that's only temporary and for development purposes as we usually don't get our hands on the production certs. So the SSL cert is expired and doesn't specify the server. And the confirmation dialog. Wouldn't be that bad if it weren't for IE, as other browsers don't care, just ask for confirmation, and execute as expected and consistantly. Please, pretty please, help me, or I might consider sacrificial killings as an option. And I think I just found a decently prized stainless steel golf-club, so I'm right on the edge of gore. Side Notes Might actually be related to IE8 window.open SSL Certificate issue. Though it doesn't explain why the dialog would auto-close (that really is beyong me...), it could help to not have the confirmation dialog and not need the dialog at all. For instance, I was thinking that just having a simple URL in that menu instead of have it entirely managed by GWT code to invoke a Window.open would solve the problem. But I don't have control on that menu, and also I'm very curious how this could be fixed otherwise and why the hell it happens in the first place...

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