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• Objective C - Constants with behaviour

  - by Akshay

  Hi, I'm new to Objective C. I am trying to define Constants which have behavior associated with them. So far I have done - @interface Direction : NSObject { NSString *displayName; } -(id)initWithDisplayName:(NSString *)aName; -(id)left; // returns West when North -(id)right; // return East when North @end @implementation Direction -(id)initWithDisplayName:(NSString *)aName { if(self = [super init]) { displayName = aName; } return self; } -(id)left {}; -(id)right {}; @end Direction* North = [Direction initWithDisplayName:@"North"]; // error - initializer element is not constant. This approach results in the indicated error. Is there a better way of doing this in Objective C.

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• Adding a custom control to a page, then adding multiple custom children into that one, null user con

  - by Rickjaah

  Hello all, While nerding my way through the day again. I came across a problem concerning adding children to an already add child control. I can add the controls, but when trying to use the controls in the added control, they all return null. This is the method: protected override CreateChildControls(EventArgs e) { UserControl uControl = LoadControl("~/controls/TwoColumn.ascx"); PlaceHolder holder = uControl.Controls.FindControl(phrContentMiddle) as PlaceHolder; holder.Controls.Add(LoadControl("~/controls/ImageShowControl"); } When i try to call any type of button/UserControl inside the ImageShowControl.... All return null. Is this something in the Page LifeCycle? If so, what is the way to go to realize this?

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• Getting the .NET Class associated with a process

  - by John P. Grieb

  As part of a WMI Coupled provider that I'm creating I need to write an instance enumerator. The code I have is below. What I need to do is get the Class instance associated with the process. Any ideas? static public WMIProviderSample GetInstance([ManagementName("ID")] int processId) { try { Process[] processes = Process.GetProcessesByName("WMI Provider Sample"); foreach (Process process in processes) { if (process.Id == processId) { // Need to convert the process to an instance of WMIProviderSampel } } return null; } catch (ArgumentException) { return null; } }

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• Performance of delegate and method group

  - by BlueFox

  Hi I was investigating the performance hit of creating Cachedependency objects, so I wrote a very simple test program as follows: using System; using System.Collections.Generic; using System.Diagnostics; using System.Web.Caching; namespace Test { internal class Program { private static readonly string[] keys = new[] {"Abc"}; private static readonly int MaxIteration = 10000000; private static void Main(string[] args) { Debug.Print("first set"); test7(); test6(); test5(); test4(); test3(); test2(); Debug.Print("second set"); test2(); test3(); test4(); test5(); test6(); test7(); } private static void test2() { DateTime start = DateTime.Now; var list = new List<CacheDependency>(); for (int i = 0; i < MaxIteration; i++) { list.Add(new CacheDependency(null, keys)); } Debug.Print("test2 Time: " + (DateTime.Now - start)); } private static void test3() { DateTime start = DateTime.Now; var list = new List<Func<CacheDependency>>(); for (int i = 0; i < MaxIteration; i++) { list.Add(() => new CacheDependency(null, keys)); } Debug.Print("test3 Time: " + (DateTime.Now - start)); } private static void test4() { var p = new Program(); DateTime start = DateTime.Now; var list = new List<Func<CacheDependency>>(); for (int i = 0; i < MaxIteration; i++) { list.Add(p.GetDep); } Debug.Print("test4 Time: " + (DateTime.Now - start)); } private static void test5() { var p = new Program(); DateTime start = DateTime.Now; var list = new List<Func<CacheDependency>>(); for (int i = 0; i < MaxIteration; i++) { list.Add(() => { return p.GetDep(); }); } Debug.Print("test5 Time: " + (DateTime.Now - start)); } private static void test6() { DateTime start = DateTime.Now; var list = new List<Func<CacheDependency>>(); for (int i = 0; i < MaxIteration; i++) { list.Add(GetDepSatic); } Debug.Print("test6 Time: " + (DateTime.Now - start)); } private static void test7() { DateTime start = DateTime.Now; var list = new List<Func<CacheDependency>>(); for (int i = 0; i < MaxIteration; i++) { list.Add(() => { return GetDepSatic(); }); } Debug.Print("test7 Time: " + (DateTime.Now - start)); } private CacheDependency GetDep() { return new CacheDependency(null, keys); } private static CacheDependency GetDepSatic() { return new CacheDependency(null, keys); } } } But I can't understand why these result looks like this: first set test7 Time: 00:00:00.4840277 test6 Time: 00:00:02.2041261 test5 Time: 00:00:00.1910109 test4 Time: 00:00:03.1401796 test3 Time: 00:00:00.1820105 test2 Time: 00:00:08.5394884 second set test2 Time: 00:00:07.7324423 test3 Time: 00:00:00.1830105 test4 Time: 00:00:02.3561347 test5 Time: 00:00:00.1750100 test6 Time: 00:00:03.2941884 test7 Time: 00:00:00.1850106 In particular: 1. Why is test4 and test6 much slower than their delegate version? I also noticed that Resharper specifically has a comment on the delegate version suggesting change test5 and test7 to "Covert to method group". Which is the same as test4 and test6 but they're actually slower? 2. I don't seem a consistent performance difference when calling test4 and test6, shouldn't static calls to be always faster?

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• Is it better to use List or Collection?

  - by Vivin Paliath

  I have an object that stores some data in a list. The implementation could change later, and I don't want to expose the internal implementation to the end user. However, the user must have the ability to modify and access this collection of data. Currently I have something like this: public List<SomeDataType> getData() { return this.data; } public void setData(List<SomeDataType> data) { this.data = data; } Does this mean that I have allowed the internal implementation details to leak out? Should I be doing this instead? public Collection<SomeDataType> getData() { return this.data; } public void setData(Collection<SomeDataType> data) { this.data = new ArrayList<SomeDataType>(data); }

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• Is it a good way to close a thread?

  - by Roman

  I have a short version of the question: I start a thread like that: counter.start();, where counter is a thread. At the point when I want to stop the thread I do that: counter.interrupt() In my thread I periodically do this check: Thread.interrupted(). If it gives true I return from the thread and, as a consequence, it stops. And here are some details, if needed: If you need more details, they are here. From the invent dispatch thread I start a counter thread in this way: public static void start() { SwingUtilities.invokeLater(new Runnable() { public void run() { showGUI(); counter.start(); } }); } where the thread is defined like that: public static Thread counter = new Thread() { public void run() { for (int i=4; i>0; i=i-1) { updateGUI(i,label); try {Thread.sleep(1000);} catch(InterruptedException e) {}; } // The time for the partner selection is over. SwingUtilities.invokeLater(new Runnable() { public void run() { frame.remove(partnerSelectionPanel); frame.add(selectionFinishedPanel); frame.invalidate(); frame.validate(); } }); } }; The thread performs countdown in the "first" window (it shows home much time left). If time limit is over, the thread close the "first" window and generate a new one. I want to modify my thread in the following way: public static Thread counter = new Thread() { public void run() { for (int i=4; i>0; i=i-1) { if (!Thread.interrupted()) { updateGUI(i,label); } else { return; } try {Thread.sleep(1000);} catch(InterruptedException e) {}; } // The time for the partner selection is over. if (!Thread.interrupted()) { SwingUtilities.invokeLater(new Runnable() { public void run() { frame.remove(partnerSelectionPanel); frame.add(selectionFinishedPanel); frame.invalidate(); frame.validate(); } }); } else { return; } } };

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• SYN flooding still a threat to servers?

  - by Rob

  Well recently I've been reading about different Denial of Service methods. One method that kind of stuck out was SYN flooding. I'm a member of some not-so-nice forums, and someone was selling a python script that would DoS a server using SYN packets with a spoofed IP address. However, if you sent a SYN packet to a server, with a spoofed IP address, the target server would return the SYN/ACK packet to the host that was spoofed. In which case, wouldn't the spoofed host return an RST packet, thus negating the 75 second long-wait, and ultimately failing in its attempt to DoS the server?

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• How to automatically insert a class notation using eclipse templates?

  - by João Paulo G. Piccinini

  Does anybody know how to insert a "@RunWith anotation" above the class signature, using eclipse templates? Ex.: @RunWith(Parameterized.class) public class MyClassTest { ... @Parameters public static Collection<Object[]> parameters() { List<Object[]> list = new ArrayList<Object[]>(); list.add(new Object[] { "mind!", "find!" }); list.add(new Object[] { "misunderstood", "understood" }); return list; } ... } __ Template: // TODO: move this '@RunWith(Parameterized.class)' to class anotation @Parameters public static Collection<Object[]> parameters() { ${type:elemType(collection)}<Object[]> parametersList = new ${type:elemType(collection)}<Object[]>(); ${cursor}// TODO: populate collection return parametersList; } __ Thanks for the help!

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• itextsharp PdfCopy and landscape pages

  - by Andreas Rehm

  I'm using itextsharp to join mutiple pdf documents and add a footer. My code works fine - except for landscape pages - it isn't detecting the page rotation - the footer is not centerd for landscape: public static int AddPagesFromStream(Document document, PdfCopy pdfCopy, Stream m, bool addFooter, int detailPages, string footer, int footerPageNumOffset, int numPages, string pageLangString, string printLangString) { CreateFont(); try { m.Seek(0, SeekOrigin.Begin); var reader = new PdfReader(m); // get page count var pdfPages = reader.NumberOfPages; var i = 0; // add pages while (i < pdfPages) { i++; // import page with pdfcopy var page = pdfCopy.GetImportedPage(reader, i); // get page center float posX; float posY; var rotation = page.BoundingBox.Rotation; if (rotation == 0 || rotation == 180) { posX = page.Width / 2; posY = 0; } else { posX = page.Height / 2; posY = 20f; } var ps = pdfCopy.CreatePageStamp(page); var cb = ps.GetOverContent(); // add footer cb.SetColorFill(BaseColor.WHITE); var gs1 = new PdfGState {FillOpacity = 0.8f}; cb.SetGState(gs1); cb.Rectangle(0, 0, document.PageSize.Width, 46f + posY); cb.Fill(); // Text cb.SetColorFill(BaseColor.BLACK); cb.SetFontAndSize(baseFont, 7); cb.BeginText(); // create text var pages = string.Format(pageLangString, i + footerPageNumOffset, numPages); cb.ShowTextAligned(PdfContentByte.ALIGN_CENTER, printLangString, posX, 40f + posY, 0f); cb.ShowTextAligned(PdfContentByte.ALIGN_CENTER, footer, posX, 28f + posY, 0f); cb.ShowTextAligned(PdfContentByte.ALIGN_CENTER, pages, posX, 20f + posY, 0f); cb.EndText(); ps.AlterContents(); // add page to new pdf pdfCopy.AddPage(page); } // close PdfReader reader.Close(); // return number of pages return i; } catch (Exception e) { Console.WriteLine(e); return 0; } } How do I detect the page rotation (e.g. landscape) format in this case? The given example works for PdfReader but not for PdfCopy. Edit: Why do I need PdfCopy? I tried copying a word pdf export. Some word hyperlinks will not work when you try to copy pages with PdfReader. Only PdfCopy transfers all needed page informations. Edit: (SOLVED) You need to use reader.GetPageRotation(i);

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• presentViewController or presentModalViewController not supporting orientation in iOS 6

  - by Prateek

  I am new to this technology. I am using this code if ([self respondsToSelector:@selector(presentViewController:animated:completion:)]) { [self presentViewController:navigationControllerCustom animated:YES completion:nil]; } else { [self presentModalViewController:navigationControllerCustom animated:YES]; } My application has two orientation Portrait and Portrait upside down. This code works well with iOS 5.1, but orientation does not work on iOS 6 I have also added this code on my navigationControllerCustom class - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationPortrait || interfaceOrientation == UIInterfaceOrientationPortraitUpsideDown); } -(NSUInteger)supportedInterfaceOrientations { return (UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskPortraitUpsideDown); } Please help me to solve this issue. Thanks in advance.

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• hibernate3-maven-plugin: entiries in different maven projects, hbm2ddl fails

  - by Mike

  I'm trying to put an entity in a different maven project. In the current project I have: @Entity public class User { ... private FacebookUser facebookUser; ... public FacebookUser getFacebookUser() { return facebookUser; } ... public void setFacebookUser(FacebookUser facebookUser) { this.facebookUser = facebookUser; } Then FacebookUser (in a different maven project, that's a dependency of a current project) is defined as: @Entity public class FacebookUser { ... @Id @GeneratedValue(strategy = GenerationType.AUTO) public Long getId() { return id; } Here is my maven hibernate3-maven-plugin configuration: <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>hibernate3-maven-plugin</artifactId> <version>2.2</version> <executions> <execution> <phase>process-classes</phase> <goals> <goal>hbm2ddl</goal> </goals> </execution> </executions> <configuration> <components> <component> <name>hbm2ddl</name> <implementation>jpaconfiguration</implementation> </component> </components> <componentProperties> <ejb3>false</ejb3> <persistenceunit>Default</persistenceunit> <outputfilename>schema.ddl</outputfilename> <drop>false</drop> <create>true</create> <export>false</export> <format>true</format> </componentProperties> </configuration> </plugin> Here is the error I'm getting: org.hibernate.MappingException: Could not determine type for: com.xxx.facebook.model.FacebookUser, at table: user, for columns: [org.hibernate.mapping.Column(facebook_user)] I know that FacebookUser is on the classpath because if I make facebook user transient, project compiles fine: @Transient public FacebookUser getFacebookUser() { return facebookUser; }

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• VB.NET function that takes other functions as a parameter, and executes them

  - by rob

  Hello, Is there a way in vb.net to create a sub/function that will take as an argument some kind of pointer to another function, and allow this new sub/function to execute the passed function? What I have are 10-12 xml-rpc functions I am calling against a remote server. Each of these functions has different argument lists (one takes 1 string, another might take 3 strings and one int, etc). All of them return an object. As I am calling these, it seems like it should be able to be factored better. For instance, everytime I call any of these functions, I want to test the return value for a session drop, and do something to try and reconnect to the remote system, etc. Using .net 3.5 Thanks! -R

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• How to dynamically replace a method implementation in ObjC2?

  - by Abhi

  I am trying to learn how to write plugins using SIMBL. I got my plugin to load with the target application, and also know the method that I wish to override. However, I am not able to use class_getInstanceMethod correctly based on snippets on the Internet. Have things changed in OSX 10.6 and/or ObjC2? The following code from culater.net gives "Dereferencing pointer to incomplete type" on the second-last statement: BOOL DTRenameSelector(Class _class, SEL _oldSelector, SEL _newSelector) { Method method = nil; // First, look for the methods method = class_getInstanceMethod(_class, _oldSelector); if (method == nil) return NO; method->method_name = _newSelector; return YES; } Is there a complete example of how to override a method using SIMBL plugins? Thanks!

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• How Can I Populate Default Form Data with a ManyToMany Field?

  - by b14ck

  Ok, I've been crawling google and Django documentation for over 2 hours now (as well as the IRC channel on freenode), and haven't been able to figure this one out. Basically, I have a model called Room, which is displayed below: class Room(models.Model): """ A `Partyline` room. Rooms on the `Partyline`s are like mini-chatrooms. Each room has a variable amount of `Caller`s, and usually a moderator of some sort. Each `Partyline` has many rooms, and it is common for `Caller`s to join multiple rooms over the duration of their call. """ LIVE = 0 PRIVATE = 1 ONE_ON_ONE = 2 UNCENSORED = 3 BULLETIN_BOARD = 4 CHILL = 5 PHONE_BOOTH = 6 TYPE_CHOICES = ( ('LR', 'Live Room'), ('PR', 'Private Room'), ('UR', 'Uncensored Room'), ) type = models.CharField('Room Type', max_length=2, choices=TYPE_CHOICES) number = models.IntegerField('Room Number') partyline = models.ForeignKey(Partyline) owner = models.ForeignKey(User, blank=True, null=True) bans = models.ManyToManyField(Caller, blank=True, null=True) def __unicode__(self): return "%s - %s %d" % (self.partyline.name, self.type, self.number) I've also got a forms.py which has the following ModelForm to represent my Room model: from django.forms import ModelForm from partyline_portal.rooms.models import Room class RoomForm(ModelForm): class Meta: model = Room I'm creating a view which allows administrators to edit a given Room object. Here's my view (so far): def edit_room(request, id=None): """ Edit various attributes of a specific `Room`. Room owners do not have access to this page. They cannot edit the attributes of the `Room`(s) that they control. """ room = get_object_or_404(Room, id=id) if not room.is_owner(request.user): return HttpResponseForbidden('Forbidden.') if is_user_type(request.user, ['admin']): form_type = RoomForm elif is_user_type(request.user, ['lm']): form_type = LineManagerEditRoomForm elif is_user_type(request.user, ['lo']): form_type = LineOwnerEditRoomForm if request.method == 'POST': form = form_type(request.POST, instance=room) if form.is_valid(): if 'owner' in form.cleaned_data: room.owner = form.cleaned_data['owner'] room.save() else: defaults = {'type': room.type, 'number': room.number, 'partyline': room.partyline.id} if room.owner: defaults['owner'] = room.owner.id if room.bans: defaults['bans'] = room.bans.all() ### this does not work properly! form = form_type(defaults, instance=room) variables = RequestContext(request, {'form': form, 'room': room}) return render_to_response('portal/rooms/edit.html', variables) Now, this view works fine when I view the page. It shows all of the form attributes, and all of the default values are filled in (when users do a GET)... EXCEPT for the default values for the ManyToMany field 'bans'. Basically, if an admins clicks on a Room object to edit, the page they go to will show all of the Rooms default values except for the 'bans'. No matter what I do, I can't find a way to get Django to display the currently 'banned users' for the Room object. Here is the line of code that needs to be changed (from the view): defaults = {'type': room.type, 'number': room.number, 'partyline': room.partyline.id} if room.owner: defaults['owner'] = room.owner.id if room.bans: defaults['bans'] = room.bans.all() ### this does not work properly! There must be some other syntax I have to use to specify the default value for the 'bans' field. I've really been pulling my hair out on this one, and would definitely appreciate some help. Thanks!

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• Whats the scope of a c function defined within objective-c class?

  - by roja

  I was reading up about bypassing objective-c's messaging to gain performance (irrelevant to this specific question) when i found an interesting bit of code: #import <Cocoa/Cocoa.h> @interface Fib : NSObject { } - (long long) cFib: (NSUInteger) number; @end @implementation Fib // c implementation of fib long long cFibIMP(NSUInteger number) { return (number < 3) ? 1 : cFib(number - 1) + cFib(number - 2); } // method wrapper for c implementation of fib - (long long) cFib: (NSUInteger) number { return cFibIMP(number); } @end My question is; when using c function, within an objective-c object, what scope is the c function (cFibIMP in this particular case) placed in? Does the objective-c class encapsulate the c function removing change of name-clash or is the c function simply dumped into the global scope of the whole objective-c program?

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• Can I configure NUnit so that Debug.Fail doesn't show a message box when I run my tests?

  - by panamack

  I have this property: public SubjectStatus Status { get { return status; } set { if (Enum.IsDefined(typeof(SubjectStatus), value)) { status = value; } else { Debug.Fail("Error setting Subject.Status", "There is no SubjectStatus enum constant defined for that value."); return; } } } and this unit test [Test] public void StatusProperty_StatusChangedToValueWithoutEnumDefinition_StatusUnchanged() { Subject subject = new TestSubjectImp("1"); // assigned by casting from an int to a defined value subject.Status = (SubjectStatus)2; Assert.AreEqual(SubjectStatus.Completed, subject.Status); // assigned by casting from an int to an undefined value subject.Status = (SubjectStatus)100; // no change to previous value Assert.AreEqual(SubjectStatus.Completed, subject.Status); } Is there a way I can prevent Debug.Fail displaying a message box when I run my tests, but allow it to show me one when I debug my application?

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• iPhone TabBar selection cancelling

  - by Chris Schnyder

  I am developing an iPhone app that displays several views, all acessed via Tab Bar items. However I need to add an additional item to the Tab Bar that simply launches a URL in Safari. I've accomplished this by adding an empty placeholder view to the TabBar and returning FALSE from shouldSelectViewController when the this view's tabBarItem is clicked on, and launching Safari at the same time. That code is: - (BOOL)tabBarController:(UITabBarController *)tabBarController shouldSelectViewController:(UIViewController *)viewController { if([[viewController tabBarItem] title] == "Website"){ //... launch Safari return FALSE; } else { return TRUE; } } PROBLEM: If the TabBar has too many items, and this "Safari Launch" tab is pushed off to the "More" navigation controller, I lose the capability to intercept the event and prevent the view from loading when clicked. Any suggested tips?

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• How to Extract Properties for Refactoring

  - by Ngu Soon Hui

  I have this property public List<PointK> LineList {get;set;} Where PointK consists of the following structure: string Mark{get;set;} double X{get;set;} doible Y{get;set;} Now, I have the following code: private static Dictionary<string , double > GetY(List<PointK> points) { var invertedDictResult = new Dictionary<string, double>(); foreach (var point in points) { if (!invertedDictResult.ContainsKey(point.Mark)) { invertedDictResult.Add(point .Mark, Math.Round(point.Y, 4)); } } return invertedDictResult; } private static Dictionary<string , double > GetX(List<PointK> points) { var invertedDictResult = new Dictionary<string, double>(); foreach (var point in points) { if (!invertedDictResult.ContainsKey(point.Mark)) { invertedDictResult.Add(point .Mark, Math.Round(point.X, 4)); } } return invertedDictResult; } How to restructure the above code?

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• initWithCoder works, but init seems to be overwriting my objects properties?

  - by Zigrivers

  Hi guys, I've been trying to teach myself how to use the Archiving/Unarchiving methods of NSCoder, but I'm stumped. I have a Singleton class that I have defined with 8 NSInteger properties. I am trying to save this object to disk and then load from disk as needed. I've got the save part down and I have the load part down as well (according to NSLogs), but after my "initWithCoder:" method loads the object's properties appropriately, the "init" method runs and resets my object's properties back to zero. I'm probably missing something basic here, but would appreciate any help! My class methods for the Singleton class: + (Actor *)shareActorState { static Actor *actorState; @synchronized(self) { if (!actorState) { actorState = [[Actor alloc] init]; } } return actorState; } -(id)init { if (self = [super init]) { NSLog(@"New Init for Actor started...\nStrength: %d", self.strength); } return self; } -(id)initWithCoder:(NSCoder *)coder { if (self = [super init]) { strength = [coder decodeIntegerForKey:@"strength"]; dexterity = [coder decodeIntegerForKey:@"dexterity"]; stamina = [coder decodeIntegerForKey:@"stamina"]; will = [coder decodeIntegerForKey:@"will"]; intelligence = [coder decodeIntegerForKey:@"intelligence"]; agility = [coder decodeIntegerForKey:@"agility"]; aura = [coder decodeIntegerForKey:@"aura"]; eyesight = [coder decodeIntegerForKey:@"eyesight"]; NSLog(@"InitWithCoder executed....\nStrength: %d\nDexterity: %d", self.strength, self.dexterity); [self retain]; } return self; } -(void) encodeWithCoder:(NSCoder *)encoder { [encoder encodeInteger:strength forKey:@"strength"]; [encoder encodeInteger:dexterity forKey:@"dexterity"]; [encoder encodeInteger:stamina forKey:@"stamina"]; [encoder encodeInteger:will forKey:@"will"]; [encoder encodeInteger:intelligence forKey:@"intelligence"]; [encoder encodeInteger:agility forKey:@"agility"]; [encoder encodeInteger:aura forKey:@"aura"]; [encoder encodeInteger:eyesight forKey:@"eyesight"]; NSLog(@"encodeWithCoder executed...."); } -(void)dealloc { //My dealloc stuff goes here [super dealloc]; } I'm a noob when it comes to this stuff and have been trying to teach myself for the last month, so forgive anything obvious. Thanks for the help!

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• Using DateDiff in Entity Framwork on a SQL CE database

  - by deverop

  I have a method which should return a list of anonymous objects with a calculated column like this: var tomorrow = DateTime.Today.AddDays(1); return from t in this.Events where (t.StartTime >= DateTime.Today && t.StartTime < tomorrow && t.EndTime.HasValue) select new { Client = t.Activity.Project.Customer.Name, Project = t.Activity.Project.Name, Task = t.Activity.Task.Name, Rate = t.Activity.Rate.Name, StartTime = t.StartTime, EndTime = t.EndTime.Value, Hours = (System.Data.Objects.SqlClient.SqlFunctions.DateDiff("m", t.StartTime, t.EndTime.Value) / 60), Description = t.Activity.Description }; Unfortunately I get the following error from the DateDiff function: The specified method 'System.Nullable1[System.Int32] DateDiff(System.String, System.Nullable1[System.DateTime], System.Nullable`1[System.DateTime])' on the type 'System.Data.Objects.SqlClient.SqlFunctions' cannot be translated into a LINQ to Entities store expression. Any ideas what I could have done wrong here? EDIT: I also tried the EntityFunctions class mentioned here, but that did not work as well. Minutes = EntityFunctions.DiffMinutes(t.EndTime, t.StartTime),

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• number of days in a period that fall within another period

  - by thomas

  I have 2 independent but contiguous date ranges. The first range is the start and end date for a project. Lets say start = 3/21/10 and end = 5/16/10. The second range is a month boundary (say 3/1/10 to 3/31/10, 4/1/10 to 4/30/10, etc.) I need to figure out how many days in each month fall into the first range. The answer to my example above is March = 10, April = 30, May = 16. I am trying to figure out an excel formula or VBA function that will give me this value. Any thoughts on an algorithm for this? I feel it should be rather easy but I can't seem to figure it out. I have a formula which will return TRUE/FALSE if ANY part of the month range is within the project start/end but not the number of days. That function is below. return month_start <= project_end And month_end >= project_start

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• SQL partial max

  - by Rob

  Struggling with the following SQL problem Assume a three dimensional table with entries (h,t,q) 1,A,20 1,A,10 1,B,5 2,A,10 2,B,3 2,B,8 3,C,50 4,A,10 etc. I would like to extract 1,30 2,11 3,50 etc. group by first element and then return the maximum q value of same type, i.e. for header number 2 there are 10 As and 11 Bs, so return 11 The "max" element (A in case 1, B in case 2 and C in case 3) is irrelevant, I just need to get out the header and that maximum value. This shouldnt be too tricky, but cant get it to work. Using MS Access, but can use SQL within.

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• Is there an easier way of creating a registry volatile subkey in .net?

  - by Simon

  So far I have the below which is taken from http://www.danielmoth.com/Blog/volatile-registrykey.aspx public static class RegistryHelper { public static RegistryKey CreateVolatileSubKey(RegistryKey rk, string subkey, RegistryKeyPermissionCheck permissionCheck) { var rk2 = rk.GetType(); const BindingFlags bfStatic = BindingFlags.NonPublic | BindingFlags.Static; const BindingFlags bfInstance = BindingFlags.NonPublic | BindingFlags.Instance; rk2.GetMethod("ValidateKeyName", bfStatic).Invoke(null, new object[] { subkey }); rk2.GetMethod("ValidateKeyMode", bfStatic).Invoke(null, new object[] { permissionCheck }); rk2.GetMethod("EnsureWriteable", bfInstance).Invoke(rk, null); subkey = (string)rk2.GetMethod("FixupName", bfStatic).Invoke(null, new object[] { subkey }); if (!(bool)rk2.GetField("remoteKey", bfInstance).GetValue(rk)) { var key = (RegistryKey)rk2.GetMethod("InternalOpenSubKey", bfInstance, null, new[] { typeof(string), typeof(bool) }, null).Invoke(rk, new object[] { subkey, permissionCheck != RegistryKeyPermissionCheck.ReadSubTree }); if (key != null) { rk2.GetMethod("CheckSubKeyWritePermission", bfInstance).Invoke(rk, new object[] { subkey }); rk2.GetMethod("CheckSubTreePermission", bfInstance).Invoke(rk, new object[] { subkey, permissionCheck }); rk2.GetField("checkMode", bfInstance).SetValue(key, permissionCheck); return key; } } rk2.GetMethod("CheckSubKeyCreatePermission", bfInstance).Invoke(rk, new object[] { subkey }); int lpdwDisposition; IntPtr hkResult; var srh = Type.GetType("Microsoft.Win32.SafeHandles.SafeRegistryHandle"); var temp = rk2.GetField("hkey", bfInstance).GetValue(rk); var rkhkey = (SafeHandleZeroOrMinusOneIsInvalid)temp; var getregistrykeyaccess = (int)rk2.GetMethod("GetRegistryKeyAccess", bfStatic, null, new[] { typeof(bool) }, null).Invoke(null, new object[] { permissionCheck != RegistryKeyPermissionCheck.ReadSubTree }); var errorCode = RegCreateKeyEx(rkhkey, subkey, 0, null, 1, getregistrykeyaccess, IntPtr.Zero, out hkResult, out lpdwDisposition); var keyNameField = rk2.GetField("keyName", bfInstance); var rkkeyName = (string)keyNameField.GetValue(rk); if (errorCode == 0 && hkResult.ToInt32() > 0) { var rkremoteKey = (bool)rk2.GetField("remoteKey", bfInstance).GetValue(rk); var hkResult2 = srh.GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic, null, new[] { typeof(IntPtr), typeof(bool) }, null).Invoke(new object[] { hkResult, true }); var key2 = (RegistryKey)rk2.GetConstructor(BindingFlags.Instance | BindingFlags.NonPublic, null, new[] { hkResult2.GetType(), typeof(bool), typeof(bool), typeof(bool), typeof(bool) }, null).Invoke(new[] { hkResult2, permissionCheck != RegistryKeyPermissionCheck.ReadSubTree, false, rkremoteKey, false }); rk2.GetMethod("CheckSubTreePermission", bfInstance).Invoke(rk, new object[] { subkey, permissionCheck }); rk2.GetField("checkMode", bfInstance).SetValue(key2, permissionCheck); if (subkey.Length == 0) { keyNameField.SetValue(key2, rkkeyName); } else { keyNameField.SetValue(key2, rkkeyName + @"\" + subkey); } key2.Close(); return rk.OpenSubKey(subkey, true); } if (errorCode != 0) rk2.GetMethod("Win32Error", bfInstance).Invoke(rk, new object[] { errorCode, rkkeyName + @"\" + subkey }); return null; } [DllImport("advapi32.dll", CharSet = CharSet.Auto)] private static extern int RegCreateKeyEx(SafeHandleZeroOrMinusOneIsInvalid hKey, string lpSubKey, int reserved, string lpClass, int dwOptions, int samDesigner, IntPtr lpSecurityAttributes, out IntPtr hkResult, out int lpdwDisposition); } Which works but is fairly ugly. Is there a better way?

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• Countdown timer using NSTimer in "0:00" format

  - by Joey Pennacchio

  I have been researching for days on how to do this and nobody has an answer. I am creating an app with 5 timers on the same view. I need to create a timer that counts down from "15:00" (minutes and seconds), and, another that counts down from "2:58" (minutes and seconds). The 15 minute timer should not repeat, but it should stop all other timers when it reaches "00:00." The "2:58" timer should repeat until the "15:00" or "Game Clock" reaches 0. Right now, I have scrapped almost all of my code and I'm working on the "2:58" repeating timer, or "rocketTimer." Does anyone know how to do this? Here is my code: #import <UIKit/UIKit.h> @interface FirstViewController : UIViewController { //Rocket Timer int totalSeconds; bool timerActive; NSTimer *rocketTimer; IBOutlet UILabel *rocketCount; int newTotalSeconds; int totalRocketSeconds; int minutes; int seconds; } - (IBAction)Start; @end and my .m #import "FirstViewController.h" @implementation FirstViewController - (NSString *)timeFormatted:(int)newTotalSeconds { int seconds = totalSeconds % 60; int minutes = (totalSeconds / 60) % 60; return [NSString stringWithFormat:@"%i:%02d"], minutes, seconds; } -(IBAction)Start { newTotalSeconds = 178; //for 2:58 newTotalSeconds = newTotalSeconds-1; rocketCount.text = [self timeFormatted:newTotalSeconds]; if(timerActive == NO){ timerActive = YES; newTotalSeconds = 178; [rocketTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerLoop) userInfo:nil repeats:YES]; } else{ timerActive = NO; [rocketTimer invalidate]; rocketTimer = nil; } } -(void)timerLoop:(id)sender { totalSeconds = totalSeconds-1; rocketCount.text = [self timeFormatted:totalSeconds]; } - (void)dealloc { [super dealloc]; [rocketTimer release]; } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view from its nib. timerActive = NO; } - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations return (interfaceOrientation == UIInterfaceOrientationPortrait); } @end

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• javaEE javax.xml.bind.MarshalException

  - by sandeep

  Hi, I am getting javax.xml.bind.MarshalException error. I am sending List from my webservice to the backingbean and I have this error. Here is my code: Errors WARNING: invocation error on ejb endpoint Login_webservice at /Login_webserviceService/Login_webservice : javax.xml.bind.MarshalException - with linked exception: [javax.xml.bind.JAXBException: class JPA.Cantable nor any of its super class is known to this context.] javax.xml.ws.WebServiceException: javax.xml.bind.MarshalException - with linked exception: [javax.xml.bind.JAXBException: class JPA.Cantable nor any of its super class is known to this context.] at com.sun.xml.ws.message.jaxb.JAXBMessage.writePayloadTo(JAXBMessage.java:325) at com.sun.xml.ws.message.AbstractMessageImpl.writeTo(AbstractMessageImpl.java:142) at com.sun.xml.ws.encoding.StreamSOAPCodec.encode(StreamSOAPCodec.java:109) at com.sun.xml.ws.encoding.SOAPBindingCodec.encode(SOAPBindingCodec.java:278) at com.sun.xml.ws.transport.http.HttpAdapter.encodePacket(HttpAdapter.java:380) at com.sun.xml.ws.transport.http.HttpAdapter.access$100(HttpAdapter.java:92) at com.sun.xml.ws.transport.http.HttpAdapter$HttpToolkit.handle(HttpAdapter.java:525) at com.sun.xml.ws.transport.http.HttpAdapter.handle(HttpAdapter.java:285) at com.sun.xml.ws.transport.http.servlet.ServletAdapter.handle(ServletAdapter.java:143) at org.glassfish.webservices.Ejb3MessageDispatcher.handlePost(Ejb3MessageDispatcher.java:116) at org.glassfish.webservices.Ejb3MessageDispatcher.invoke(Ejb3MessageDispatcher.java:87) at org.glassfish.webservices.EjbWebServiceServlet.dispatchToEjbEndpoint(EjbWebServiceServlet.java:196) at org.glassfish.webservices.EjbWebServiceServlet.service(EjbWebServiceServlet.java:127) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) Backing bean @WebServiceRef(wsdlLocation = "http://localhost:26565/Login_webserviceService/Login_webservice?WSDL") public String login() { System.out.println("Login Phase entered"); int result = 0; List list; List finalList = null; try { Weblogin.LoginWebserviceService service = new Weblogin.LoginWebserviceService(); Weblogin.LoginWebservice port = service.getLoginWebservicePort(); result = port.login(voterID, password); Weblogin.LoginWebservice port1 = service.getLoginWebservicePort(); list = port1.candDetails(1); finalList = list; this.setList(finalList); } catch (Exception e) { e.printStackTrace(); } if (result == 1) return "polling"; else return "login"; } Webservice public List candDetails(int pollEvent) { List resultList = null; List finalList = null; try { if (pollEvent == 1) { resultList = em.createNamedQuery("Cantable.findAll").getResultList(); finalList = resultList; } } catch (Exception e) { e.printStackTrace(); } return resultList; }

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