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  • by reference in C++

    - by lego69
    I have this snippet of the code Stack& Stack:: operator=(const Stack& stack){ if(this == &stack){ return *this } } here I define operator = but I can't understand, if I receive by reference stack why it should be & in this == &stack and not this == stack and why we return * in return *this and not this thanks in advance for any help

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  • PHP Pass by reference

    - by Salil
    I am calling this function which is modifying an array by reference: function addWord(&$words, $wordIndex, $word) { $words[$wordIndex] = $word; } At the function call, addWord(&$words, $wordsIndex, $word); ($words is used only during the function call) doesn't work. How do I make this or a similar functionality work? I want the addWord to be a separate function.

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  • Multiple reference in SQL

    - by AGarofoli
    Hi! I'm working on a db but i'm kinda new to this so i've bumped into a problem today. I've got some tables: OFFICE, ROOM, EMPLOYEE and DOCUMENT. Document must specify the sender, which can be a single employee, an entire room or an entire office so it must have a reference to the primary keys of those tables. Should I do a "parallel" table for handle it (for example i've done one for handle the multiple recipients documents) or there is another way? Thank you

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  • Getting a null reference exception exporting a slightly complex rdlc report to excel

    - by George Handlin
    Have an issue in exporting a slightly complex report to excel from an rdlc. Exporting a simple tabular report works fine, but getting a null reference exception with a more complex one. As is usually the case, it works on the server in the development environment, but not in the test environment. The server in the development environment has iis, sql and sql reporting services on it and test only has iis (I didn't set them up). I'm guessing there is something that gets installed with SSRS that is not installed with just the report viewer. The report has several parameters going into it and a few generic lists going in for datasources. Some tables for display as well as a list. Working with the 2005 version. Exception follows: [NullReferenceException: Object reference not set to an instance of an object.] Microsoft.ReportingServices.Rendering.ExcelRenderer.ExcelRenderer.RenderPageLayout(PageLayout pageLayout, Int32& currentPageNumber, Stack& stack) +91 Microsoft.ReportingServices.Rendering.ExcelRenderer.ExcelRenderer.RenderPageCollection(PageCollection pageCollection, Int32& currentPageNumber, Stack& stack, PageLayout& lastPageLayout) +607 Microsoft.ReportingServices.Rendering.ExcelRenderer.ExcelRenderer.GenerateWorkSheets() +150 Microsoft.ReportingServices.Rendering.ExcelRenderer.ExcelRenderer.GenerateMainSheet() +358 Microsoft.ReportingServices.Rendering.ExcelRenderer.ExcelRenderer.RenderExcelWorkBook(CreateAndRegisterStream createAndRegisterStream) +158 Microsoft.ReportingServices.Rendering.ExcelRenderer.ExcelRenderer.ProcessReport(CreateAndRegisterStream createAndRegisterStream) +385 Microsoft.ReportingServices.Rendering.ExcelRenderer.ExcelRenderer.Render(Report report, NameValueCollection reportServerParameters, NameValueCollection deviceInfo, NameValueCollection clientCapabilities, EvaluateHeaderFooterExpressions evaluateHeaderFooterExpressions, CreateAndRegisterStream createAndRegisterStream) +230 [ReportRenderingException: An error occurred during rendering of the report.] Microsoft.ReportingServices.Rendering.ExcelRenderer.ExcelRenderer.Render(Report report, NameValueCollection reportServerParameters, NameValueCollection deviceInfo, NameValueCollection clientCapabilities, EvaluateHeaderFooterExpressions evaluateHeaderFooterExpressions, CreateAndRegisterStream createAndRegisterStream) +296 Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RenderSnapshot(IRenderingExtension renderer, CreateReportChunk createChunkCallback, RenderingContext rc, GetResource getResourceCallback) +1124 [WrapperReportRenderingException: An error occurred during rendering of the report.] Microsoft.ReportingServices.ReportProcessing.ReportProcessing.RenderSnapshot(IRenderingExtension renderer, CreateReportChunk createChunkCallback, RenderingContext rc, GetResource getResourceCallback) +1681 Microsoft.Reporting.LocalService.RenderWithDataCache(PreviewItemContext itemContext, ParameterInfoCollection reportParameters, IEnumerable dataSources, DatasourceCredentialsCollection credentials, IRenderingExtension renderer, ReportProcessing repProc, CreateAndRegisterStream createStreamCallback, ReportRuntimeSetup runtimeSetup) +1693 Microsoft.Reporting.LocalService.Render(PreviewItemContext itemContext, Boolean allowInternalRenderers, ParameterInfoCollection reportParameters, IEnumerable dataSources, DatasourceCredentialsCollection credentials, CreateAndRegisterStream createStreamCallback, ReportRuntimeSetup runtimeSetup, ProcessingMessageList& warnings) +227 Microsoft.Reporting.WebForms.LocalReport.InternalRender(String format, Boolean allowInternalRenderers, String deviceInfo, CreateAndRegisterStream createStreamCallback, Warning[]& warnings) +235 [LocalProcessingException: An error occurred during local report processing.] Microsoft.Reporting.WebForms.LocalReport.InternalRender(String format, Boolean allowInternalRenderers, String deviceInfo, CreateAndRegisterStream createStreamCallback, Warning[]& warnings) +276 Microsoft.Reporting.WebForms.LocalReport.InternalRender(String format, Boolean allowInternalRenderers, String deviceInfo, String& mimeType, String& encoding, String& fileNameExtension, String[]& streams, Warning[]& warnings) +189 Microsoft.Reporting.WebForms.LocalReport.Render(String format, String deviceInfo, String& mimeType, String& encoding, String& fileNameExtension, String[]& streams, Warning[]& warnings) +28 Microsoft.Reporting.WebForms.LocalReportControlSource.RenderReport(String format, String deviceInfo, NameValueCollection additionalParams, String& mimeType, String& fileNameExtension) +52 Microsoft.Reporting.WebForms.ExportOperation.PerformOperation(NameValueCollection urlQuery, HttpResponse response) +153 Microsoft.Reporting.WebForms.HttpHandler.ProcessRequest(HttpContext context) +202 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +303 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +64

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  • Can't obtain reference to EKReminder array retrieved from fetchRemindersMatchingPredicate

    - by Scionwest
    When I create an NSPredicate via EKEventStore predicateForRemindersInCalendars; and pass it to EKEventStore fetchRemindersMatchingPredicate:completion:^ I can loop through the reminders array provided by the completion code block, but when I try to store a reference to the reminders array, or create a copy of the array into a local variable or instance variable, both array's remain empty. The reminders array is never copied to them. This is the method I am using, in the method, I create a predicate, pass it to the event store and then loop through all of the reminders logging their title via NSLog. I can see the reminder titles during runtime thanks to NSLog, but the local arrayOfReminders object is empty. I also try to add each reminder into an instance variable of NSMutableArray, but once I leave the completion code block, the instance variable remains empty. Am I missing something here? Can someone please tell me why I can't grab a reference to all of the reminders for use through-out the app? I am not having any issues at all accessing and storing EKEvents, but for some reason I can't do it with EKReminders. - (void)findAllReminders { NSPredicate *predicate = [self.eventStore predicateForRemindersInCalendars:nil]; __block NSArray *arrayOfReminders = [[NSArray alloc] init]; [self.eventStore fetchRemindersMatchingPredicate:predicate completion:^(NSArray *reminders) { arrayOfReminders = [reminders copy]; //Does not work. for (EKReminder *reminder in reminders) { [self.remindersForTheDay addObject:reminder]; NSLog(@"%@", reminder.title); } }]; //Always = 0; if ([self.remindersForTheDay count]) { NSLog(@"Instance Variable has reminders!"); } //Always = 0; if ([arrayOfReminders count]) { NSLog(@"Local Variable has reminders!"); } } The eventStore getter is where I perform my instantiation and get access to the event store. - (EKEventStore *)eventStore { if (!_eventStore) { _eventStore = [[EKEventStore alloc] init]; //respondsToSelector indicates iOS 6 support. if ([_eventStore respondsToSelector:@selector(requestAccessToEntityType:completion:)]) { //Request access to user calendar [_eventStore requestAccessToEntityType:EKEntityTypeEvent completion:^(BOOL granted, NSError *error) { if (granted) { NSLog(@"iOS 6+ Access to EventStore calendar granted."); } else { NSLog(@"Access to EventStore calendar denied."); } }]; //Request access to user Reminders [_eventStore requestAccessToEntityType:EKEntityTypeReminder completion:^(BOOL granted, NSError *error) { if (granted) { NSLog(@"iOS 6+ Access to EventStore Reminders granted."); } else { NSLog(@"Access to EventStore Reminders denied."); } }]; } else { //iOS 5.x and lower support if Selector is not supported NSLog(@"iOS 5.x < Access to EventStore calendar granted."); } for (EKCalendar *cal in self.calendars) { NSLog(@"Calendar found: %@", cal.title); } [_eventStore reset]; } return _eventStore; } Lastly, just to show that I am initializing my remindersForTheDay instance variable using lazy instantiation. - (NSMutableArray *)remindersForTheDay { if (!_remindersForTheDay) _remindersForTheDay = [[NSMutableArray alloc] init]; return _remindersForTheDay; } I've read through the Apple documentation and it doesn't provide any explanation that I can find to answer this. I read through the Blocks Programming docs and it states that you can access local and instance variables without issues from within a block, but for some reason, the above code does not work. Any help would be greatly appreciated, I've scoured Google for answers but have yet to get this figured out. Thanks everyone! Johnathon.

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  • VSDBCMD returns "An unexpected failure occurred: Object reference not set to an instance of an objec

    - by Matt Wrock
    I have been succesfully using the command line database deployment tool VSDBCMD on my dev and test environments but the tool fails in our integration environmrnt. I am using the VS 2010 version of the tool. The servers have all of the prerequisites including: .net 4.0 sql server compact edition 3.5 sp1 (as well as the full edition of 2008) sql server 2008 server management objects sql server 2008 native client sql server system clr types msxml 6 all of the dependent DLLs included in: C:\Program Files\Microsoft SQL Server Compact Edition\v3.5\desktop*.dll C:\Program Files\Microsoft SQL Server Compact Edition\v3.5*.dll C:\Program Files (x86)\Microsoft Visual Studio 10.0\VSTSDB\Deploy**. The only reference to this error that I have been able to find has to do with a bug in the VS 2008 edition when the HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\9.0 key is missing. In my case the 10.0 version of the key exists. Has anyone else encountered this?

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  • WPF parent-child window: binding reference problem

    - by LukePet
    I have a WPF Window that open a modal child window to load some data. Both window have a own viewmodel, now I have this problem: after I close the child window it seems still running in background! To close the child window I set DialogResult from viewmodel command; now, if I create a new data and then I edit it from parent window (with the child window closed before), the child window still capture the property changed event for the properties previously bind. How can avoid this? I would clear every reference with data when I close modal window. Which is the best practise to do it?

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  • C# - Pass by value & Pass by Reference

    - by Lijo
    Hi Team, Could you please explain the following behavior of C# Class. I expect the classResult as "Class Lijo"; but actual value is “Changed”. We’re making a copy of the reference. Though the copy is pointing to the same address, the method receiving the argument cannot change original. Still why the value gets changed ? public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { Person p = new Person(); p.Name = "Class Lijo"; Utilityclass.TestMethod(p); string classResult = p.Name; Response.Write(classResult); } } public class Utilityclass { public static void TestMethod(Person k) { k.Name = "Changed"; } } public class Person { private string name; public string Name { get { return name; } set { name = value; } } } Thanks Lijo

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  • Visual Studio reference x64 GAC

    - by icelava
    How can one get Visual Studio 2005/2008 to reference assemblies in the 64-bit GAC instead of the 32-bit GAC? We are settin the target platfom to x64 and the compiler is throwing the error of Error 2 Warning as Error: Assembly generation -- Referenced assembly 'System.Data.dll' targets a different processor Common Error 3 Warning as Error: Assembly generation -- Referenced assembly 'mscorlib.dll' targets a different processor Common Error 4 Assembly signing failed; output may not be signed -- The system cannot find the file specified. Common Update 29 Dec 08 Been trying out Aaron Stebner's suggestions to place 64-bit assemblies onto an isolated location (e.g. C:\Windows\Microsoft.NET\Framework64\v2.0.50727\GAC_64) and creating additional entries in the registry like HKLM\SOFTWARE\Microsoft.NETFramework\AssemblyFolders\GAC_64 or HKLM\SOFTWARE\Microsoft.NETFramework\v2.0.50727\AssemblyFoldersEx\GAC_64 but Visual Studio 2005 is still not picking it up....

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  • Are there gotchas using varargs with reference parameters

    - by Roddy
    I have this piece of code (summarized)... AnsiString working(AnsiString format,...) { va_list argptr; AnsiString buff; va_start(argptr, format); buff.vprintf(format.c_str(), argptr); va_end(argptr); return buff; } And, on the basis that pass by reference is preferred where possible, I changed it thusly. AnsiString broken(const AnsiString &format,...) { ... the rest, totally identical ... } My calling code is like this:- AnsiString s1, s2; s1 = working("Hello %s", "World"); s2 = broken("Hello %s", "World"); But, s1 contains "Hello World", while s2 has "Hello (null)". I think this is due to the way va_start works, but I'm not exactly sure what's going on.

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  • How do you give variables reference in javascript?

    - by Eric
    I want to give variables reference in javascript. For example, I want to do: a=1 b=a a=2 and have b=2, and change accordingly to a. Is this possible in javascript? If it isn't is there a way to do like a.onchange = function () {b=a}? What I wanted to do was make a function like makeobject which make an object and puts it in an array and than returns it like function makeobject() { objects[objects.length] = {blah:'whatever',foo:8}; } so than I could do a=makeobject() b=makeobject() c=makeobject() and later in the code do for (i in objects) { objects[i].blah = 'whatev'; } and also change the values of a,b and c

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  • Assembly reference in Silverlight class library and used only in xaml is not packaged in XAP

    - by Brandon Copeland
    I have a 3rd party library (A). That library is referenced in my Silverlight class library (B). That Silverlight class library is referenced in my Silverlight application (C). The 3rd party library is not explicitly referenced in the Silverlight application. It seems that "A" is added to my XAP if "A" is used in any class in "B" because of a chain in dependencies (C - B - A). This is the behavior I would expect and need. If "A" is never explicitly used in a C# class but only defined in Xaml, the assembly is not packaged to the XAP. Maybe "A" includes a control that is only used declaratively and never referenced otherwise. Is this behavior by design? Am I missing a property somewhere that controls this? I would prefer to not explicitly reference the third party library in my Silverlight application. What's to best practice to ensure all necessary assemblies are packaged in the XAP?

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  • Assinging a GD reference to a new variable fails to copy

    - by Stomped
    This is a contrived example, but it illustrates my problem much more concisely then the code I'm using - and I've tested this and it exhibits the problem: $image = imagecreatefromjpeg('test.jpg'); $copy_of_image = $image; // The important bit imagedestroy($image); header('Content-type: image/jpeg'); imagejpeg($copy_of_image); Now, my expectation is that $copy_of_image is exactly that, but when I run this, it fails, printing out the URL of the script of all things. Comment out the imagedestroy() and it works just fine. a var_dump of $image provides: resource(3) of type (gd) So why can't I copy this? Apparently the assignment $copy_of_image = $image is creating a reference rather then a copy - is there a way to prevent that?

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  • Referencing a control programatically with external source

    - by James
    Forgive me about the title, I have no idea what this is called. I have a MS Access database set up, with a Period field that has either values 1, 2, 3, 4 or 5. I retrieve these values using a database connection and I would like to reference a particular control based on what period was grabbed from the database. Here's example code, pseudo of course. TextBox(dr(3)).Text = dr(0) dr(3) contains the period, and dr(0) contains the content I would like to put into the text box. I have these text boxes on my form: TextBox1, TextBox2, TextBox3, TextBox4 and TextBox5. So if dr(3) contained 2 then I would want to reference TextBox2. I hope I've made myself clear, any help would be greatly appreciated, thanks. :)

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  • How to reference both ASSEMBLYVERSION and ASSEMBLYFILEVERSION?

    - by Chuck
    I need to display both the AssemblyVersion and the AssemblyFileVersion. In AssemblyInfo.cs, I have: [assembly: AssemblyVersion("1.0.*")] [assembly: AssemblyFileVersion("2009.8.0")] However, I only get "2009.8.0" when I reference the above with: public class VersionInfo { public static string AppVersion() { return System.Diagnostics.FileVersionInfo.GetVersionInfo(System.Reflection.Assembly.GetExecutingAssembly().Location).FileMajorPart + "." + System.Diagnostics.FileVersionInfo.GetVersionInfo(System.Reflection.Assembly.GetExecutingAssembly().Location).FileMinorPart + "." + System.Diagnostics.FileVersionInfo.GetVersionInfo(System.Reflection.Assembly.GetExecutingAssembly().Location).FileBuildPart; } } How can I display both values? Thanks.

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  • How to make a reference to a normal java class from GWT server side

    - by mohammed-qumhieh
    hello I building my project using GWT plugin for eclipse Galileo, after i done from RPC between the server and client, i trying to make a reference from gwt server side to normal java class in non-gwt-project, but every time i make an object from the class (which in non-gwt-project) gives me ClassNotFoundException. i did the buildpath for the gwt project, but still gives me the same exception, is there a way to make that from server side (not from client side). i need help please, i spent a lot of time searching for solution but i did not found anything. i appreciate any suggestions...thanks

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  • undefined reference linker error

    - by klaus-johan
    Hi, I've stuck myself in a c++ project under linux ,for which I get an undefined reference when I try to create an object of a class that I just wrote.I believe this is an linker error caused by the fact that somewhere , somehow I should tell the linker to take into account the new class. I looked at the project properties and at the run command it executes a script (cmake.sh) . Because the project wasn't created by me , and because I'm a novice in working under linux, I just don't know how to direct the linker to do what I expect him to do !

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  • Reference methods defined in one JScript file from another JScript

    - by Thomas Svensen
    I am writing some server-side scripts using jscript and WSH. The scripts are getting quite long, and some common functions and variables would fit better in a general library script which I included in my various script instances. But, I cannot find a way reference one JScript file from another. For a moment, I though reading the file contents and passing it to "eval()" could work. But, as it says on MSDN: "Note that new variables or types defined in the eval statement are not visible to the enclosing program." (http://msdn.microsoft.com/en-us/library/b51a45x6.aspx) Is there any way to include/refence a JScript from another one?

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  • What does this WCF error mean: "Custom tool warning: Cannot import wsdl:portType"

    - by stiank81
    I created a WCF service library project in my solution, and have service references to this. I use the services from a class library, so I have references from my WPF application project in addition to the class library. Services are set up straight forward - only changed to get async service functions. Everything was working fine - until I wanted to update my service references. It failed, so I eventually rolled back and retried, but it failed even then! So - updating the service references fails without doing any changes to it. Why?! The error I get is this one: Custom tool error: Failed to generate code for the service reference 'MyServiceReference'. Please check other error and warning messages for details. The warning gives more information: Custom tool warning: Cannot import wsdl:portType Detail: An exception was thrown while running a WSDL import extension: System.ServiceModel.Description.DataContractSerializerMessageContractImporter Error: List of referenced types contains more than one type with data contract name 'Patient' in namespace 'http://schemas.datacontract.org/2004/07/MyApp.Model'. Need to exclude all but one of the following types. Only matching types can be valid references: "MyApp.Dashboard.MyServiceReference.Patient, Medski.Dashboard, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" (matching) "MyApp.Model.Patient, MyApp.Model, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" (matching) XPath to Error Source: //wsdl:definitions[@targetNamespace='http://tempuri.org/']/wsdl:portType[@name='ISomeService'] There are two similar warnings too saying: Custom tool warning: Cannot import wsdl:binding Detail: There was an error importing a wsdl:portType that the wsdl:binding is dependent on. XPath to wsdl:portType: //wsdl:definitions[@targetNamespace='http://tempuri.org/']/wsdl:portType[@name='ISomeService'] XPath to Error Source: //wsdl:definitions[@targetNamespace='http://tempuri.org/']/wsdl:binding[@name='WSHttpBinding_ISomeService'] And the same for: Custom tool warning: Cannot import wsdl:port .. I find this all confusing.. I don't have a Patient class on the client side Dashboard except the one I got through the service reference. So what does it mean? And why does it suddenly show? Remember: I didn't even change anything! Now, the solution to this was found here, but without an explanation to what this means. So; in the "Configure service reference" for the service I uncheck the "Reuse types in the referenced assemblies" checkbox. Rebuilding now it all works fine without problems. But what did I really change? Will this make an impact on my application? And when should one uncheck this? I do want to reuse the types I've set up DataContract on, but no more. Will I still get access to those without this checked?

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  • Null Reference Exception on MVVM pattern

    - by Mohit Deshpande
    System.NullReferenceException Object reference not set to an instance of an object. at Microsoft.Windows.Design.DocumentModel.Trees.MarkupDocumentTreeManager.<FindMarkupNodePath>d__0.MoveNext() at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable1 source) at MS.Internal.Services.DocumentInformationServiceImpl.get_Root() at MS.Internal.Designer.VSDesigner.Load() at MS.Internal.Designer.VSIsolatedDesigner.VSIsolatedView.Load() at MS.Internal.Designer.VSIsolatedDesigner.VSIsolatedDesignerFactory.Load(IsolatedView view) at MS.Internal.Host.Isolation.IsolatedDesigner.BootstrapProxy.LoadDesigner(IsolatedDesignerFactory factory, IsolatedView view) at MS.Internal.Host.Isolation.IsolatedDesigner.BootstrapProxy.LoadDesigner(IsolatedDesignerFactory factory, IsolatedView view) at MS.Internal.Host.Isolation.IsolatedDesigner.Load() at MS.Internal.Designer.DesignerPane.LoadDesignerView() I keep getting this exception and then intellisense stops working in a XAML text editor. Any ideas why?

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  • Incorrect decrement of the reference count

    - by idober
    I have the following problem: In one flow of the execution I use alloc, and on the other flow, alloc is not needed. At the end of the if statement, in any case, I release the object. When I do 'build and Analize' I get an error: 'Incorrect decrement of the reference count of an object is not owned by the caller'. How to solve that? UIImage *image; int RandomIndex = arc4random() % 10; if (RandomIndex<5) { image = [[UIImage alloc] initWithContentsOfFile:@"dd"]; } else { image = [UIImage imageNamed:@"dd"]; } UIImageView *imageLabel =[[UIImageView alloc] initWithImage:image]; [image release]; [imageLabel release];

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