Hi All, What are the major features/advantages in vista over xp? Any links are available by microsoft? -- Thanks & Regards, Alex. ...more >>

Hi all, I am devloping an application in VC++ with Visual Studio 2005. In this applicatin, Threadpool and stl classes are there. All threads will use(sending by pointer to vector) stl vector simultaneously for reading and writing purpose. Sometimes, application getting crash. I think, v...more >>

Hello everyone, I met with a strange issue that derived class function can not access base class's protected member. Do you know why? Here is the error message and code. [Code] error C2248: 'base::~base' : cannot access protected member declared in class 'base' [/Code] [Code] cl...more >>

Hello everyone, I think in built-in C/C++ functions, there is no direct function call to trim heading and trailing space characters, right? So, we have to implement it manually by iterating the string to check character one by one. Support not using MFC. thanks in advance, George...more >>

The Image class allows loading a bitmap from a graphic file. So far I've gotten it to work with JPG and BMP files. What other graphic file formats are supported in this way? Is this fixed based on the .NET Framework used (e.g., the Image class defines which formats can be used), or can diff...more >>

I have a C++/CLI library and I'm calling a function, RegisterTraceGuids() that takes a function callback as a parm. I need the callback function to be a managed delegate. In order to do this I create a pin_ptr of the delegate and then pass it to RegisterTraceGuids. The problem is that pin_...more >>

I want to create a clock that will countdown the number of days left to = a certain event. I want it to show, days, hours, minutes and seconds. If = possible I woud like to make it a floating form or if possible to show = in the task bar, is this possible to do and were could I find something = ...more >>

Hello everyone, Just interested to learn how C++ implements delete this statement internally. From logical point of view, I can not imagine how to implement a component which destroy itself. What makes me confused is the component is relying on itself even in the process of destroy, ho...more >>

Hello everyone, From MSDN, http://msdn2.microsoft.com/en-us/library/ms682583.aspx parameter fdwReason of DllMain has four values, DLL_PROCESS_ATTACH DLL_PROCESS_DETACH DLL_THREAD_ATTACH DLL_THREAD_DETACH I think we could simply understand what MSDN described about the four values...more >>

Hello everyone, I have noticed a lot of COM samples that the function AddRef and Release function of COM inteface is not synchronized to make it thread safe when dealing with adding/decreasing reference count. Is it needed to synchronize AddRef and Release? Or the COM runtime underlyin...more >>

Hello everyone, What is the purpose of virtual destructor? If currently, no derived class? thanks in advance, George...more >>

Hello, dear guys, I am a little confused. My host is 32-bit Windows XP, and my IDE is VS2005 Professional Edition. Also, there is a Win32 VC project. Now, I want to rebuild this project in 64-bit mode for 64-bit platform. From the MSDN, the Professional Edition support 64-bit build. But I don...more >>

I would like to know if the following is possible: create a component using C# or VB.NET -> component will use the ..netframework v2 create a VB (NONE .net) COM object that uses the above created component And if this is possible are their any pitfalls that we should be aware off? ...more >>

Hi, I am trying to wrap some std C++ code so it can be used from C#. The problem I'm having is that I can't seem to derive a ref class from a C+ + interface. Compilation fails with C2811: "...can only inherit from a ref class or interface class". AFAIK an abstract struct constitutes a valid i...more >>

Hello, I'm in the process of writing a managed wrapper on legacy C++ code. I have to deal with methods that are using the ellipsis. For instance,the legacy method is : void CLog::Print (LPCSTR szMask, ...) { CHAR szText[512]; va_list arglist; va_start (arglist, szMask); wvsprintfA...more >>

Hi, I am a fairly experienced C++ (MFC) programmer, with alot of MFC code still in use. Most of my projects are still using Visual Studio 6.0. I want to modernise, but don't want the lengthy (costly) disruption of porting my useful stuff to a more recent programming environment. I now hav...more >>

I am in the process of converting an application to Unicode that is built with Visual C++ .NET 2003. On application startup in debug mode I get an exception. The problem appears to be that code with #ifndef _UNICDODE is executed in output.c, the library code for supporting printf functions. I ...more >>

Why can't I safe_cast a Dictionary to an Object? Generic::Dictionary<String^, String^> Dict = gcnew Generic::Dictionary<String^, String^>(); Object^ DictObject = safe_cast<Object ^>(Dict); Anyone know why the compiler won't handle this syntax? Dave ...more >>

In the System::Speech namespace there asychronous methods on both the SR and TTS sides. For example, RecognizeAsync( ) and SpeakAsync( ). For the purposes of this discussion, it isn't important what these methods do, but how they do them. That is, upon executing these methods, they do not ne...more >>

I am writing an application in C++ in VS 2005. I wrote a function with a throw list, but the compiler and the runtime seem to ignore it. tha function can still throw an exception that does not appear in the throw list, and the handling environment catches it just fine. Is it possible that VS doe...more >>

Using VS2005 SP1, I have a C++ COM DLL and a C# client. If the C++ and MIDL source use type INT_PTR and the C# client uses type IntPtr, then the result works in x86 (32 bit) but doesn't compile in x64 (64-bit). The C# compiler gives error messages like Error CS1503: Parameter '6': cannot ...more >>

I am using a DLL function (complied in VC7), which takes a parameter of 'HANDLE *' datatype. The DLL developers recommend passing a HANDLE object using the following syntax: HANDLE obj =NULL; func(&obj); On successful execution of the code 'obj' is initialised to some value. This code ...more >>