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• Error reached after genereated entity framework classes by edmgen tool

  - by loviji

  Hello, First I read this question, but this knowledge did not help to solve my problems. In initial I've created edmx file by Visual Studio. Generated files with names: uqsModel.Designer.cs uqsModel.edmx This files are located on App_Code folder. And my web app work normally. In Web Config generated connectionstring automatically. <add name="uqsEntities" connectionString="metadata=res://*/App_Code.uqsModel.csdl|res://*/App_Code.uqsModel.ssdl|res://*/App_Code.uqsModel.msl;provider=System.Data.SqlClient;provider connection string=&quot;Data Source=aemloviji\sqlexpress;Initial Catalog=uqs;Integrated Security=True;MultipleActiveResultSets=True&quot;" providerName="System.Data.EntityClient" /></connectionStrings> Then I had to generate classes by the instrument edmgen tool(full generation mode). Generated new files with names: uqsModel.cs uqsModel.csdl uqsModel.msl uqsModel.ssdl uqsViews.cs it save new classed to the folder where edmx files located before, and remove existing edmx files. And when page redirrects to any web page server side code fails. And problem: Unable to load the specified metadata resource. Some idea, please.

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• ThreadAbortException (WebClient using DownloadFile to grab file from server)

  - by baron

  Hi Everyone, Referencing my Earlier Question, regarding downloading a file from a server and handling exceptions properly. I am positive that I had this solved, then in classic programming fashion, returned days later to frustratingly find it broken :-( Updated code: private static void GoGetIt(HttpContext context) { var directoryInfoOfWhereTheDirectoryFullOfFilesShouldBe = new FileInfo(......); var name = SomeBasicLogicToDecideName(); //if (!directoryInfoOfWhereTheDirectoryFullOfFilesShouldBe.RefreshExists()) //{ // throw new Exception(string.Format("Could not find {0}.", name)); //} var tempDirectory = ""; //Omitted - creates temporary directory try { directoryInfoOfWhereTheDirectoryFullOfFilesShouldBe.CopyAll(tempDirectory); var response = context.Response; response.ContentType = "binary/octet-stream"; response.AddHeader("Content-Disposition", string.Format("attachment;filename={0}.zip", name)); ZipHelper.ZipDirectoryToStream(tempDirectory, response.OutputStream); response.End(); } catch (Exception ex) { Debug.WriteLine(ex.ToString()); context.Response.StatusCode = 404; } finally { tempDirectory.DeleteWithPrejudice(); } } This was working fine, and returning the zip, otherwise if the file didn't exist returning 404. Then on the client side I could handle this: public bool Download() { try { using (var client = new WebClient()) { client.DownloadFile(name, tempFilePath); } } catch (Exception) { fileExists = false; } return fileExists; } But the problem now is two things. 1) I get System.Threading.ThreadAbortException: Thread was being aborted in the server side try-catch block. Usually this was just a file not found exception. I have no idea what or why that new exception is throwing? 2) Now that a different exception is throwing on the server side instead of the file not found, it would seem I can't use this set up for the application, because back on client side, any exception is assumed to be filenotfound. Any help, especially info on why this ThreadAbortException is throwing!?!? greatly appreciated. Cheers

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• ‘Empty’ results from MQL Query. Freebase Schema: /film/film/starring & /film/actor/film

  - by user1879631

  First post here, so I hope this is enough detail. I started using freebase-python today to get film information for a program that I’m working on. One thing that I need to grab is a list of actors that starred in a film. I’ve followed some tutorials and guides on the way to do this, and can get a list of films for a director or the director of a film, but when I try to do the same with an actor or a film’s cast, I get ‘null’ results. I have the same problem in both Python and the Freebase MQL Query Editor, and you can see what I've tried below. Links to all of the examples below written in the editor can be found here, as Stack Overflow wouldn't let me post links underneath each example on my first post! Working director query in Python: import freebase fb = freebase.mqlread q = {'type':'/film/film', 'name':'Inception', 'directed_by':[]} fb(q) Working director's filmography query in Python: import freebase fb = freebase.mqlread q = {'type':'/film/director', 'name': 'Christopher Nolan', 'film':[]} fb(q) Based on these tests, I tried to do the same with actors, but with odd results: Not working cast list query in Python: import freebase fb = freebase.mqlread q = {'type':'/film/film', 'name':'Inception', 'starring':[]} fb(q) Not working actor's filmography query in Python: import freebase fb = freebase.mqlread q = {'type':'/film/actor', 'name':'Leonardo DiCaprio', 'film':[]} fb(q) Strangely, I get an accurate number of actors/films back, but no names. Does anyone have any idea what the problem might be? Thanks a lot, I'd appreciate any advice.

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• ASP.NET MVC - Javascript array always passed to controller as null

  - by Xuan Vu

  I'm having some problem with passing a javascript array to the controller. I have several checkboxes on my View, when a checkbox is checked, its ID will be saved to an array and then I need to use that array in the controller. Here are the code: VIEW: var selectedSearchUsers = new Array(); $(document).ready(function () { $("#userSearch").click(function () { selectedSearchUsers.length = 0; ShowLoading(); $.ajax({ type: "POST", url: '/manage/searchusers', dataType: "json", data: $("#userSearchForm").serialize(), success: function (result) { UserSearchSuccess(result); }, cache: false, complete: function () { HideLoading(); } }); }); $(".userSearchOption").live("change", function () { var box = $(this); var id = box.attr("dataId"); var checked = box.attr("checked"); if (checked) { selectedSearchUsers.push(id); } else { selectedSearchUsers.splice(selectedSearchUsers.indexOf(id), 1); } }); $("#Send").click(function () { var postUserIDs = { values: selectedSearchUsers }; ShowLoading(); $.post("/Manage/ComposeMessage", postUserIDs, function (data) { }, "json"); }); }); When the "Send" button is clicked, I want to pass the selectedSearchUsers to the "ComposeMessage" action. Here is the Action code: public JsonResult ComposeMessage(List values) { //int count = selectedSearchUsers.Length; string count = values.Count.ToString(); return Json(count); } However, the List values is always null. Any idea why? Thank you very much.

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• Android Scoreloop, OpenFeint etc al

  - by theblitz

  I am looking to use one of the social networks in my Android program. Most important for me is the ability to build a continuous leadership board in which players move up and down depending their wins/loses to others. The idea is for players to challenge others head-to-head. The winner gains points and the loser loses points. Equally important, I want this feature to include the possibility to "charge" the player game coins. Scoreloop includes the possibility of challenges but they are there in order to win coins off other players. In other words, they are the means to the end. In my case I need it to be the other way around. The "ends" is to be higher in the leadership board and the "means" are to play others with coins. Scoreloop do have a continuos leadership board but it is not accessible from the program. I tried looking at OpenFeint but their site is a real mess. It is impossible to understand from there exactly what is and isn't available. I signed up and tried to add my program. I ended up adding it four times and cannot delete it!

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• CSharpCodeProvider 'cannot find metadata file' Compiling Plugin Code With Mono

  - by Jason Champion

  I have some code in an XML file that I load and compile at runtime in an application. This works fine on Windows, but under Mono I get assembly reference errors. Here's the examine code in question: public static bool CompileSpell(Spell spell) { CSharpCodeProvider prov = new CSharpCodeProvider(); CompilerParameters cp = new CompilerParameters(); cp.GenerateExecutable = true; cp.GenerateInMemory = true; cp.ReferencedAssemblies.Add("system.dll"); cp.ReferencedAssemblies.Add("system.xml.dll"); cp.ReferencedAssemblies.Add("BasternaeMud.dll"); cp.ReferencedAssemblies.Add("ZoneData.dll"); Log.Trace("Compiling spell '" + spell.Name + "'."); StringBuilder sb = new StringBuilder(); int idx = spell.FileName.IndexOf('.'); string file = spell.FileName; if (idx > 0) { file = spell.FileName.Substring(0, idx); } int lines = GenerateWithMain(sb, spell.Code, "BasternaeMud"); CompilerResults cr = prov.CompileAssemblyFromSource(cp,sb.ToString()); .... The specific errors I get in the compiler results are: cannot find metadata file 'system.dll' at line 0 column 0. cannot find metadata file 'system.xml.dll' at line 0 column 0. Mono obviously doesn't like the way I add referenced assemblies to the code I'm compiling for system.xml and system.xml.dll. The other two assemblies add fine, which is no surprise because they're the code that the compiler is actually executing from and exist in the executable directory. Any clue what I need to do to fix this? Maybe I could just drop those DLLs in the executable directory, but that feels like a dumb idea.

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• OleDb database to DataSet and back in c#?

  - by Troy

  I'm writing a program that lets a user: Connect to an (arbitrary) View all of the tables in that database in separate DataGridViews Edit them in the program, generate random data, and see the results Choose to commit those changes or revert So I discovered the DataSet class, which looks like it's capable of holding everything that a database would, and I decided that the best thing to do here would be to load everything into one dataset, let the user edit it, and then save the dataset back to the database. The problem is that the only way I can find to load the database tables is this: set = new DataSet(); DataTable schema = connection.GetOleDbSchemaTable( OleDbSchemaGuid.Tables, new string[] { null, null, null, "TABLE" }); foreach (DataRow row in schema.Rows) { string tableName = row.Field<string>("TABLE_NAME"); DataTable dTable = new DataTable(); new OleDbDataAdapter("SELECT * FROM " + tableName, connection).Fill(dTable); dTable.TableName = tableName; set.Tables.Add(dTable); } while it seems like there should be a simpler way given that datasets appear to be designed for exactly this purpose. The real problem though is when I try saving these things. In order to use the OleDbDataAdapter.Update() method, I'm told that I have to provide valid INSERT queries. Doesn't that kind of negate the whole point of having a class to handle this stuff for me? Anyway, I'm hoping somebody can either explain how to load and save a database into a dataset or maybe give me a better idea of how to do what I'm trying to do. I could always parse the commands together myself, but that doesn't seem like the best solution.

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• Extending Python and Objective-C

  - by chpwn

  I'm a fan of clean code. I like my languages to be able to express what I'm trying to do, but I like the syntax to mirror that too. For example, I work on a lot of programs in Objective-C for jailbroken iPhones, which patch other code using the method_setImplementation() function of the runtime. Or, in PyObjC, I have to use the syntax UIView.initWithFrame_(), which is also pretty awful and unreadable with the way the method names are structured. In both cases, the language does not support this in syntax. I've found three basic ways that this is done: Insane macros. Take a look at this "CaptainHook", it does what I'm looking for in a usable way, but it isn't quite clean and is a major hack. There's also "Logos", which implements a very nice syntax, but is written in Perl parsing my code with a ton of regular expressions. This scares me. I like the idea of adding a %hook ClassName, but not by using regular expressions to parse C or Objective-C. Finally, there is Cycript. This is an extension to JavaScript which interfaces with the Objective-C runtime and allows you to use Objective-C style code in your JavaScript, and inject that into other processes. This is likely the cleanest as it actually uses a parser for the JavaScript, but I'm not a huge fan of that language in general. Should, and how should, I create an extension to Python and Objective-C to allow me to do this? Is it worth writing a parser for my language to transform the syntax into something nicer, if it is only in a very specialized niche like this? Should I just live with the horrible syntax of the default Objective-C hooking or PyObjC?

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• Package creation issues using SQL Developer

  - by Carter

  So I've never worked with stored procedures and have not a whole lot of DB experience in general and I've been assigned a task that requires I create a package and I'm stuck. Using SQL Developer, I'm trying to create a package called JUMPTO with this code... create or replace package JUMPTO is type t_locations is ref cursor; procedure procGetLocations(locations out t_locations); end JUMPTO; When I run it, it spits out this PL/SQL code block... DECLARE LOCATIONS APPLICATION.JUMPTO.t_locations; BEGIN JUMPTO.PROCGET_LOCATIONS( LOCATIONS = LOCATIONS ); -- Modify the code to output the variable -- DBMS_OUTPUT.PUT_LINE('LOCATIONS = ' || LOCATIONS); END; A tutorial I found said to take out the comment for that second line there. I've tried with and without the comment. When I hit "ok" I get the error... ORA-06550: line 2, column 32: PLS-00302: component 'JUMPTO' must be declared ORA-06550: line 2, column 13: PL/SQL: item ignored ORA-06550: line 6, column 18: PLS-00320: the declaration of the type of this expression is incomplete or malformed ORA-06550: line 5, column 3: PL/SQL: Statement ignored ORA-06512: at line 58 I really don't have any idea what's going on, this is all completely new territory for me. I tried creating a body that just selected some stuff from the database but nothing is working the way it seems like it should in my head. Can anyone give me any insight into this?

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• Problem in IE8 with GET Parameters in opening a new windows with javascript.

  - by amfa95

  Hi, I have a problem with IE8 and the opening of a new window with javascript and submitting parameters with special characters. <a href="javascript:oWin('/html/de/4664286/printregistrationcontent.html?12-security question&#61;Wie hei&#223;t Ihr Lieblingsrestaurant','PRINT',800,600);" class="print">Seite drucken</a> The Problem is the letter 'ß' (sharp S). As you can see the string above is encodes due to anti XSS. This link works in FF and IE6 but IE8 is transmitting the URL Parameter as character with code 65*** (don't know the exaxt value). In the opening window you will only see a square (because character with 65000+ is not printable). I also tried to use URL Encoding instead of HTML encoding <a href="javascript:oWin('/html/de/4664286/printregistrationcontent.html?12-security question%3DWie hei%C3%9Ft Ihr Lieblingsrestaurant','PRINT',800,600);" class="print">Seite drucken</a> If i click on this Link in FF or IE6 it works as expected, but IE8 will fail to transmit the "ß" to the server and therefor will also get it back in the wrong way. If i paste this url to the IE8 it will work too, but not if the window is opened by javascript. The Javascript function oWin is defined as follows function oWin(url,title,sizeH,sizeV) { winHandle = top.open(url,title,'toolbar=no,directories=no,status=yes,scrollbars=yes,menubar=no,resizable=no,width='+sizeH+',height='+sizeV); if(navigator.appVersion.indexOf("MSIE 3",0)==-1) id = setTimeout('winHandle.focus()',1000); } If someone has an idea where to look for the reason please answer to this. Thank you amfa

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• ez components and AWS PHP SDK makes ez components freak out

  - by David

  Hi, I try to work with ez Components and AWS PHP SDK at the same time. I have a file called resize.php which is just handling resizing images using the ez Components ImageTransition tools. I queue the image for resize in Amazon AWS SQS. If I load the AWS PHP SDK and ez Components in the same file, PHP always complains about not finding the ez Components classes. Code looks something like this: amazonSQS.php: require 'modules/resize.php'; require 'modules/aws/sdk.class.php'; $sqs = new AmazonSQS(); $response = $sqs->send_message($queue_url, $message); resize.php: function resize_image($filename) { $settings = new ezcImageConverterSettings( array( //new ezcImageHandlerSettings( 'GD', 'ezcImageGdHandler' ), new ezcImageHandlerSettings( 'ImageMagick', 'ezcImageImagemagickHandler' ), ) ); Error message: Fatal error: Class 'ezcImageConverterSettings' not found in /home/www.com/public_html/modules/resize.php on line 10 If I call resize.php from another PHP file which has AWS not included, it works fine. I load ezComponents like this: require 'ezc/Base/ezc_bootstrap.php'; It is installed as a PEAR package. Any idea someone?

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• Android Launcher Shortcuts

  - by Tim

  I have made a simple punch in / punch out time clock application. I want to add the user the option of making a shortcut on the homescreen that will toggle the state of the app(time out / time in) but I don't want this shortcut to open up the app on the screen at all. here is my setupShortcut() private void setupShortcut() { Intent shortcutIntent = new Intent(this, Toggle.class); // shortcutIntent.setClassName(this, Toggle.class.getName()); shortcutIntent.putExtra(EXTRA_KEY, "ToggleShortcut"); shortcutIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); Intent intent = new Intent(); intent.putExtra(Intent.EXTRA_SHORTCUT_INTENT, shortcutIntent); intent.putExtra(Intent.EXTRA_SHORTCUT_NAME, "ToggleShortcut"); Parcelable iconResource = Intent.ShortcutIconResource.fromContext(this, R.drawable.app_sample_code); intent.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE, iconResource); setResult(RESULT_OK, intent); } Toggle.class is an activity that toggles the state for me. In the manifest I have these settings on it <activity android:name=".Toggle" android:exported="true" android:theme="@android:style/Theme.Translucent.NoTitleBar"> As it is now I can create a shortcut on the home screen then press it. The first time I press it it starts the Toggle activity and completes it fine, but it also opens up the TimeClock activity on the screen. If I then hit the back button I go back to the home. I can now press this shortcut and it will start the Toggle activity and not change the screen. Before I added: shortcutIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); It would open up the TimeClock activity every time. Now it is just the first time. But I want it to never show anything on the screen when the Toggle shortcut is pressed. Does anyone have any idea of how to get rid of that?

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• How do I debug a crash when I run my garbage-collected app in Rosetta?

  - by Rob Keniger

  I have a Universal app which is targeting 10.5 and which uses garbage collection. I am building for ppc, i386 and x86_64. I don't have access to a physical PowerPC machine so I am trying to use Rosetta to confirm that the PowerPC portion of the app works correctly. However, as soon as the app is launched in Rosetta it immediately crashes with the following crash log: Process: FooApp [91567] Path: /Users/rob/Development/src/FooApp/build/Release 64-bit/FooApp.app/Contents/MacOS/FooApp Identifier: com.companyX.FooApp Version: 0.9 (build d540e05) (2) Code Type: PPC (Translated) Parent Process: launchd [708] Date/Time: 2010-04-09 18:32:23.962 +1000 OS Version: Mac OS X 10.6.3 (10D573) Report Version: 6 Exception Type: EXC_CRASH (SIGTRAP) Exception Codes: 0x0000000000000000, 0x0000000000000000 Crashed Thread: 5 ...snip non-relevant threads... Thread 5 Crashed: 0 libSystem.B.dylib 0x8023656a __pthread_kill + 10 1 libSystem.B.dylib 0x80235e17 pthread_kill + 95 2 com.companyX.FooApp 0xb80bfb30 0xb8000000 + 785200 3 com.companyX.FooApp 0xb80c0037 0xb8000000 + 786487 4 com.companyX.FooApp 0xb80dd8e8 0xb8000000 + 907496 5 com.companyX.FooApp 0xb8145397 spin_lock_wrapper + 1791 6 com.companyX.FooApp 0xb801ceb7 0xb8000000 + 118455 I have used the Apple docs on debugging translated apps and the information on this page to attach gdb to the app when it's running in Rosetta. The app immediately breaks into the debugger upon launch: Program received signal SIGTRAP, Trace/breakpoint trap. [Switching to thread 15107] 0x9151fdd4 in auto_fatal () (gdb) bt #0 0x9151fdd4 in auto_fatal () #1 0x91536d84 in Auto::Thread::get_register_state () #2 0x915372f8 in Auto::Thread::scan_other_thread () #3 0x91529be4 in Auto::Zone::scan_registered_threads () #4 0x91539114 in Auto::MemoryScanner::scan_thread_ranges () #5 0x9153b000 in Auto::MemoryScanner::scan () #6 0x9153049c in Auto::Zone::collect () #7 0x915198f4 in auto_collect_internal () #8 0x9151a094 in auto_collection_work () #9 0x96687434 in _dispatch_call_block_and_release () #10 0x9668912c in _dispatch_queue_drain () #11 0x96689350 in _dispatch_queue_invoke () #12 0x966895c0 in _dispatch_worker_thread2 () #13 0x966896fc in _dispatch_worker_thread () #14 0x965a97e8 in _pthread_body () (gdb) I have no idea where to start with this. It looks like the Garbage Collector is failing very badly. Are garbage-collected PowerPC apps not supported in Rosetta? I can't see any mention of this limitation in the docs if so. Does anyone have any ideas?

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• Replace Temp with Query

  - by student

  The Replace Temp with Query refactoring method is recommended quite widely now but seems to be very inefficient for very little gain. The method from the Martin Fowler's site gives the following example: Extract the expression into a method. Replace all references to the temp with the expression. The new method can then be used in other methods. double basePrice = _quantity * _itemPrice; if (basePrice > 1000) return basePrice * 0.95; else return basePrice * 0.98; becomes if (basePrice() > 1000) return basePrice() * 0.95; else return basePrice() * 0.98; double basePrice() { return _quantity * _itemPrice; } Why is this a good idea? surely it means the calculation is needlessly repeated and you have the overhead of calling a function. I know CPU cycles are cheap but throwing them away like this seems careless? Am I missing something?

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• What is private bytes, virtual bytes, working set?

  - by Devil Jin

  I am using perfmon windows utility to debug memory leak in a process. Perfmon explaination: Working Set- Working Set is the current size, in bytes, of the Working Set of this process. The Working Set is the set of memory pages touched recently by the threads in the process. If free memory in the computer is above a threshold, pages are left in the Working Set of a process even if they are not in use. When free memory falls below a threshold, pages are trimmed from Working Sets. If they are needed they will then be soft-faulted back into the Working Set before leaving main memory. Virtual Bytes- Virtual Bytes is the current size, in bytes, of the virtual address space the process is using. Use of virtual address space does not necessarily imply corresponding use of either disk or main memory pages. Virtual space is finite, and the process can limit its ability to load libraries. Private Bytes- Private Bytes is the current size, in bytes, of memory that this process has allocated that cannot be shared with other processes. Q1. Is it the private byte should I measure to be sure if the process is having any leak as it does not involve any shared libraries and any leak if happening will be coming from the process itself? Q2. What is the total memory consumed by the process? Is it the Virtual byte size? or Is it the sum of Virtual Bytes and Working Set Q3. Is there any relation between private bytes, working set and virtual bytes. Q4. Any tool which gives a better idea memory information?

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• Phantom class definitions in Flash CS5?

  - by cc

  I'm trying to get FlashPunk working in the Flash CS5 IDE (don't ask), and I'm having trouble getting it to compile. In strict mode, the error I'm getting is: net/flashpunk/FP.as, Line 95 1119: Access of possibly undefined property _inherit through a reference with static type World. Typically, this means that there is a missing variable definition or the class being compiled cannot see that variable. Presumably, the framework compiles for others, so I'm pretty sure this isn't the issue, but I went in anyway and made sure the variables existed and set these variables to public (they were set to internal), but the error still occurred. It was almost like the compiler wasn't seeing the property definitions. If I turn off "strict mode", the app compiles, but then I get this error: ArgumentError: Error #1063: Argument count mismatch on World(). Expected 2, got 0. Now, World is a class in the FlashPunk package. In the class definition for it, the constructor does not expect any arguments: public function World() { ... ...and yet, for some reason, Flash is expecting two arguments. So it appears that everything is correct, but Flash is somehow expecting something different than what World's constructor defines. These two issues combined makes it seem like Flash is getting some other phantom version of another class called "World" which has two constructor arguments and different properties. I've gone in and checked the ActionScript settings. The only external-to-project stuff referenced is the default "$(AppConfig)/ActionScript 3.0/libs". And I'm not using any of my own code other than a single "Main.as" file that super's Engine to set a few parameters - certainly, there's no new World class. With a generic name like "World", I thought perhaps this is a reserved class name within Flash or something, maybe imported from the default libs mentioned above, but some Googling turning up empty seems to put the lie to that. Any idea what might be going on?

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• Problem with reCaptcha and .NET

  - by vtortola

  Hi, I get this error with reCaptcha: 'Input error: response: Required field must not be blank challenge: Required field must not be blank privatekey: Required field must not be blank' I'm sending the data via POST, so I don't understand what is going on. This is the code I use: public static Boolean Check(String challenge, String response) { try { String privatekey = "7LeAbLoSAAAABJBn05uo6sZoFNoFnK2XKyF3dRXL"; String remoteip = HttpContext.Current.Request.UserHostAddress; WebRequest req = WebRequest.Create("http://api-verify.recaptcha.net/verify"); req.Method = "POST"; using (StreamWriter sw = new StreamWriter(req.GetRequestStream())) { sw.Write("privatekey={0}&remoteip={1}&challenge={2}&response={3}", privatekey, remoteip, challenge, response); sw.Flush(); } String resultString = String.Empty; String errorString = String.Empty; using (StreamReader sr = new StreamReader(req.GetResponse().GetResponseStream())) { resultString = sr.ReadLine(); errorString = sr.ReadLine(); } Boolean b; return Boolean.TryParse(resultString, out b) && b; } catch (Exception) { return false; } } (Of course that'is not the correct private key :P) I have no idea what the problem is about, I think I'm sending the data correctly, but that error says that apparently I'm not sending anything. What could be the problem? Cheers.

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• How can I write good "research code"?

  - by John

  "Research code" is often held up as a paragon of what not to do when writing software. Certainly, the kind of code that often results from trying to solve a research problem can end up being poorly-designed, difficult to debug, etc. But my question is this: does research code have to be this way? Is it possible to write good research code? Is the only approach to consider the first version a poorly-written prototype to be discarded in favour of the better-designed second version? Software engineering has all sorts of best practices about how to design and write good code, but I don't usually find this relevant when you don't have a good idea ahead of time what the final system will look like. The final system is likely to be a result of what did or didn't work along the way, and the only way to determine what does or doesn't work is to write the code first. As you find things that don't work, you change what the final system looks like, moving further away from your original design (assuming you had one). I'd be interested in any personal experience with these issues, as well as any books or other resources anyone can point me to.

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• Ruby - Immutable Objects

  - by Chris Bunch

  I've got a highly multithreaded app written in Ruby that shares a few instance variables. Writes to these variables are rare (1%) while reads are very common (99%). What is the best way (either in your opinion or in the idiomatic Ruby fashion) to ensure that these threads always see the most up-to-date values involved? Here's some ideas so far that I had (although I'd like your input before I overhaul this): Have a lock that most be used before reading or writing any of these variables (from Java Concurrency in Practice). The downside of this is that it puts a lot of synchronize blocks in my code and I don't see an easy way to avoid it. Use Ruby's freeze method (see here), although it looks equally cumbersome and doesn't give me any of the synchronization benefits that the first option gives. These options both seem pretty similar but hopefully anyone out there will have a better idea (or can argue well for one of these ideas). I'd also be fine with making the objects immutable so they aren't corrupted or altered in the middle of an operation, but I don't know Ruby well enough to make the call on my own and this question seems to argue that objects are highly mutable.

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• I want to merge two PostScript Documents, pagewise. How?

  - by Peter Miehle

  hello, i have a tricky question, so i need to describe my problem: i need to print 2-sided booklets (a third of a paper) on normal paper (german A4, but letter is okay also) and cut the paper afterwards. The Pages are in a Postscript Level 2 File (generated by an ancient printer driver, so no chance to patch that, except ps2ps) generated by me with the ancient OS's Printing driver facilities (GpiMove, GpiLine, GpiText etc). I do not want to throw away two-thirds of the paper, so my idea is: Take file one, two and three, merge them (how?) on new double-sided papers by translate/move file two and three by one resp. two thirds and print the resulting new pages. If it helps, I can manage to print one page of the booklet per file. I cannot "speak" postscript natively, but I am capable of parsing and merging and manipulating files programmaticly. Maybe you can hint me to a webpage. I've read through the manuals on adobe's site and followed the links on www.inkguides.com/postscript.asp Maybe there are techniques with PDF that would help? I can translate ps2pdf. Thanks for help Peter Miehle PS: my current solution: i.e. 8 pages: print page 1, 4 and 7 on page one, 2,5,8 on page two and 3,6,blank on page three, cut the paper and restack. But i want to use a electrical cutting machine, which works better with thicker stacks of paper.

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• Wrapping my head around MongoDB, mongomapper and joins...

  - by cbmeeks

  I'm new to MongoDB and I've used RDBMS for years. Anyway, let's say I have the following collections: Realtors many :bookmarks key :name Houses key :address, String key :bathrooms, Integer Properties key :address, String key :landtype, String Bookmark key :notes I want a Realtor to be able to bookmark a House and/or a Property. Notice that Houses and Properties are stand-alone and have no idea about Realtors or Bookmarks. I want the Bookmark to be sort of like a "join table" in MySQL. The Houses/Properties come from a different source so they can't be modified. I would like to be able to do this in Rails: r = Realtor.first r.bookmarks would give me: House1 House2 PropertyABC PropertyOO1 etc... There will be thousands of Houses and Properties. I realize that this is what RDBMS were made for. But there are several reasons why I am using MongoDB so I would like to make this work. Any suggestions on how to do something like this would be appreciated. Thanks!

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• what's the best way, using the TFS API, to add a label to a file?

  - by jcollum

  I'd like to add a label to a set of files using the TFS API. My code looks like this: VersionControlLabel label = new VersionControlLabel(this.vcServer, this.label, this.vcServer.AuthenticatedUser, this.labelScopeDirectory, this.labelComment); List<LabelItemSpec> labelSpecs = new List<LabelItemSpec>(); // iterate files and versions foreach (var fileAndVersion in this.filesAndVersions) { VersionSpec vs = null; Item i = null; // i have no idea why the itemspec is needed instead of the item and version... ItemSpec iSpec = new ItemSpec("{0}/{1}".FormatString(this.source, fileAndVersion.Key), RecursionType.None); GetItemAndVersionSpec(fileAndVersion.Key, fileAndVersion.Value, out vs, out i); labelSpecs.Add(new LabelItemSpec(iSpec, vs, false)); } this.vcServer.CreateLabel(label, labelSpecs.ToArray(), LabelChildOption.Merge); (there are some extension methods in there... this is all largely lifted from this blog post) The thing that concerns me is things like this in the MSDN docs: This enumeration supports the .NET Framework infrastructure and is not intended to be used directly from your code. So MSDN is telling me not to use that enumeration (LabelChildOption), which is afaik the only way to create a label and add it to a file. Is there a better way? Is this sort of a "grey" area in the TFS API?

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• how to use gettimeofday() or something equivalent with Visual Studio C++ 2008?

  - by make

  Hi, Could someone please help me to use gettimeofday() function with Visual Studio C++ 2008 on Windows XP? here is a code that I found somewhere on the net: #include < time.h > #include <windows.h> #if defined(_MSC_VER) || defined(_MSC_EXTENSIONS) #define DELTA_EPOCH_IN_MICROSECS 11644473600000000Ui64 #else #define DELTA_EPOCH_IN_MICROSECS 11644473600000000ULL #endif struct timezone { int tz_minuteswest; /* minutes W of Greenwich */ int tz_dsttime; /* type of dst correction */ }; int gettimeofday(struct timeval *tv, struct timezone *tz) { FILETIME ft; unsigned __int64 tmpres = 0; static int tzflag; if (NULL != tv) { GetSystemTimeAsFileTime(&ft); tmpres |= ft.dwHighDateTime; tmpres <<= 32; tmpres |= ft.dwLowDateTime; /*converting file time to unix epoch*/ tmpres -= DELTA_EPOCH_IN_MICROSECS; tmpres /= 10; /*convert into microseconds*/ tv->tv_sec = (long)(tmpres / 1000000UL); tv->tv_usec = (long)(tmpres % 1000000UL); } if (NULL != tz) { if (!tzflag) { _tzset(); tzflag++; } tz->tz_minuteswest = _timezone / 60; tz->tz_dsttime = _daylight; } return 0; } ... // call gettimeofday() gettimeofday(&tv, &tz); tm = localtime(&tv.tv_sec); Last yesr when I tested this code VC++6, it works fine. But now when I use VC++ 2008, I am getting error of exception handling. So is there any idea on how to use gettimeofday or something equivalent? Thanks for your reply and any help would be very appreciated:

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• MySQL Full-Text Search Across Multiple Tables - Quick/Long Solution?

  - by Kerry

  Hello all, I have been doing a bit of research on full-text searches as we realized a series of LIKE statements are terrible. My first find was MySQL full-text searches. I tried to implement this and it worked on one table, failed when I was trying to join multiple tables, and so I consulted stackoverflow's articles (look at the end for a list of the ones I've been to) I didn't see anything that clearly answered my questions. I'm trying to get this done literally in an hour or two (quick solution) but I also want to do a better long term solution. Here is my query: SELECT a.`product_id`, a.`name`, a.`slug`, a.`description`, b.`list_price`, b.`price`, c.`image`, c.`swatch`, e.`name` AS industry FROM `products` AS a LEFT JOIN `website_products` AS b ON (a.`product_id` = b.`product_id`) LEFT JOIN ( SELECT `product_id`, `image`, `swatch` FROM `product_images` WHERE `sequence` = 0) AS c ON (a.`product_id` = c.`product_id`) LEFT JOIN `brands` AS d ON (a.`brand_id` = d.`brand_id`) INNER JOIN `industries` AS e ON (a.`industry_id` = e.`industry_id`) WHERE b.`website_id` = 96 AND b.`status` = 1 AND b.`active` = 1 AND MATCH( a.`name`, a.`sku`, a.`description`, d.`name` ) AGAINST ( 'ashley sofa' ) GROUP BY a.`product_id` ORDER BY b.`sequence` LIMIT 0, 9 The error I get is: Incorrect arguments to MATCH If I remove d.name from the MATCH statement it works. I have a full-text index on that column. I saw one of the articles say to use an OR MATCH for this table, but won't that lose the effectiveness of being able to rank them together or match them properly? Other places said to use UNIONs but I don't know how to do that properly. Any advice would be greatly appreciated. In the idea of a long term solution it seems that either Sphinx or Lucene is best. Now by no means and I a MySQL guru, and I heard that Lucene is a bit more complicated to setup, any recommendations or directions would be great. Articles: http://stackoverflow.com/questions/1117005/mysql-full-text-search-across-multiple-tables http://stackoverflow.com/questions/668371/mysql-fulltext-search-across-1-table http://stackoverflow.com/questions/2378366/mysql-how-to-make-multiple-table-fulltext-search http://stackoverflow.com/questions/737275/pros-cons-of-full-text-search-engine-lucene-sphinx-postgresql-full-text-searc http://stackoverflow.com/questions/1059253/searching-across-multiple-tables-best-practices

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• Add a custom variable to an email header already within a gmail inbox

  - by Ali

  Hi guys - this may seem odd but I was wondering if it was possible to add custom header details to emails already in an inbox. Like lets say I wish to add in the Header of the email something like - myvariable = myvalue and then be able to query it somehow. I'm looking at code from Iloha mail and most of the details like subject and from recieved etc are in the headers and you can search through them. SO is it possible to add my own custom variable to an email header and query it in the same way? How can it be done using php? EDIT ==================== Thanks I know how you can modify the headers of sent messages plus also query for custom variables in message headers however in this case I want to know if it would be possible to add a custom variable in a recieved message already in my inbox. Actually let me define the situation here. I'm working on a google apps solution which requires maintaining references to emails. Basically the application is as such that when an email comes in - we create an order from that email and wish to maintain a reference to that EXACT email by some kind of identifier which would enable us to identify that email. The fact is that we don't want to download the emails in a database and maintain a separate store as we would want to keep all the emailing on GMAIL. We just need: A way to be able to 'link' to a specific email permanently - the UID is just a sequence number and not very reliable. We couldn't find any property of emails that could function as a unique ID or primary key and so we thought if we could instead generate a key on our end and store it in a custom variable on the email itself. However it seems unfortunately that there isn't a way to manipulate headers of an already existing email. :( is there any solution to this problem I could use any IDEA !

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