I need function that generates simple tone with frequency 1562.5 HZ to be played on the audio device for duration 1920 microseconds. i can not use the Beep function since it has the following declaration BOOL Beep( DWORD dwFreq, // sound frequency in HZ DWORD dwDuration //...more >>

My objective was to remove all traces of Form1 from my source which was a vcpp.Net Windows application. And I was successful - but in doing so, I lost the ability to graphically modify my form! Could it be true that you must have the original Form1 to work with the GUI ToolBox ? I doubt it but...more >>

I am calling an unmanaged DLL like follows in a Class wrapper. namespace blah { [DllImport("DLLName.DLL", EntryPoint="BlahEntryPoint", CallingConvention=CallingConvention.ThisCall] public static extern void blahFn(out long blah, out long blah2); class sealed ClassBlah { privat...more >>

I am reading in image files in a program and I read in the header in ascii mode and the data in binary mode. The problem is, sometimes tellg() gives me a completely incorrect result and sometimes it is just fine. It is quite annoying because there is no other good way to read these file ...more >>

How do I use auto_ptr in managed C++? Here is my existing code: namespace Alta { public __gc class CMDAQ { public: CMDAQ(); ~CMDAQ(); private: CDAQControl* itsDAQControl; }; } namespace Alta { CMDAQ::CMDAQ( ) { itsDAQ...more >>

What is the best way of accessing info from ini files from VC++ (in VS.NET). ...more >>

I have I do while ((choice==1)||(choice==2)||(choice==3)); loop where I am sking a user to enter appropriate value 1,2,3. If user enters incorrect value I want then to see the main menu. How do I do this? ...more >>

What am I Doing incorect? My choice value is 2, but for some reason cout is not printing the message? switch (choice) { case 1:cout<<"Enter value in Fahrenheit:" ;break; case 2:cout<<"Enter value in Centigrade:";break; case 3:cout<<"Thank you for using this program.";break; default: break; ...more >>

I am using a mutiple application sharing a dll. In my application i am loading the dll using LoadLibrary Function. My Question is: 1) I have loaded the dll in the 1st appication 2) Now if again if i try to load the same dll again in another application whether i can know if the dll is loaded ...more >>

hResult = pDefaultDomain->CreateInstanceFrom( pAppDomain- >m_bstrLoadAssemblyName, pAppDomain->m_bstrManagedClass, &pObjectHandle ) This call gives the E_ACCESSDENIED return value. I have checked that nothing is using the loaded assembly and that the access rigts are OK. Does anyone kno...more >>

Hi, When I create a window as follows aWnd->hWnd = CreateWindowEx(WS_EX_CLIENTEDGE, strClassName, strWindowName, dwStyle, 10, 10, 40,40, hWndParent, NULL, aWnd->hInstance, NULL); The window handle hWnd is null but when I call GetLastError the error code is 0??????? Cany Someone Help?...more >>

I have a managed c++ web service that uses ATL. Everything worked fine with VC 7.0, but when I recompile with VC 7.1 I get the following link warning: LINK : warning LNK4243: DLL containing objects compiled with /clr is not linked with /NOENTRY; image may not run correctly. Having looked ...more >>

I have the C++ exe created with Microsoft Visual Studio 6.0. Now have ported the code to Microsoft Visual Studio 7.0. to compile with /clr extension ON; as the exe uses some managed code components. The project compiles fine in both Debug and Release version. It also runs perfectly in both ve...more >>

Hi, I am doing the following to read in a file however it does'nt seem to be reading in the correct size its like a few hundred bytes short? level = fopen("c:\\MALEV01.AIM","r"); fseek(level,0,SEEK_END); level_size=ftell(level); fseek(level,0,SEEK_SET); levelBuffer = (char*)malloc(level_s...more >>

Hello I want to change this code example wrote in C# to VC++ .NET, please give me a translation namespace MyNamespace { public class MyObject : MarshalByRefObject{ public override Object InitializeLifetimeService() { // This lease never expires. ...more >>

Hi, When I try to compile my VC++.Net project in the release mode, I'm getting the error, "error result returned from 'cl.exe' ". It happens when I add a static data member to a class whose all other members are static This doesn't happen when I compile in the debug mode. Anybody has come a...more >>

Hi, Is there anyway to make a transparent brush with C++? For example I want to make a brush that has a color of red with a 50% tranparency. Thanks Marcus de Leon ...more >>

Hi List, I have an existing 7.0 project which I need to create a makefile for. I tried to do it this way: file -> add new project -> makefile project. It generates a testing.vproj for me, so, seriously, I don't know what to do with it. Can someone provide me a step-by-step to create a make...more >>

Okay, here's the deal. I installed VIsual C++.net and Visual Basic.net, both 2002 versions, earlier this year. I had to delete my profile on the network recently, and now I'm re-installing VC. I can't get it to install! I keep getting an internal error on the second disc (2349, I *think*). No ...more >>

Hi, I have a C++ code. I tried to open and run in in VC++.Net and it gave me an error: fatal error C1083: Cannot open include file: 'getopt.h': No such file or directory Somehow it did not find the standard C++ library. And the question is what do I need to do in order to run the C++ c...more >>

Hello, is there a way to distinguish between VC.NET 2002 and VC.NET 2003 at compile-time (pre-defined preprocessor macros)? I have only found _MSC_VER to be set to 1300 in both versions, which doesn't solve this problem. Do I have to define my own macro or redefine _MSC_VER? regards, And...more >>

I have a .H file with tonnes of #define constants and I want to access that from C# but I dont want to rewrite the header file as a class. Is there a way after including that in MC++ to get those values from C#? ...more >>

In the attached code fragment I have a buffer overflow and a memory access violation. When I run the code .Net fails to verify the IL because of the buffer overflow and I get an exception as expected. My question relates to the memory access violation, specfically, what should happen? My guess ...more >>

Hi, when applying changes to the code and hitting [F5] to debug, a MessageBox pops up asking me if I want to build before debugging. Of course I want, that's why I've changed the code... Is there a simple way to suppress this MessageBox in Studio 7 and to start a Build-Debug sequence immediate...more >>

Hi, currently we have an intern writing an OPC server for us in C++. OPC is a hierarchy of classes based on DCOM. When the intern leaves I will have to maintain that server. since i am new to DCOM, I was wondering if anyone could recommend a good book for learning DCOM: what it is, what it ...more >>

I just had VC++ installed by our administrator - when I tried to debug a test application I discovered I did not have access because I wasn't in the Debugger User Group. Geez - I guess I'll call the administrator back up and have him waste another thirty minutes because Microsoft is busy ...more >>

I am converting some projects from VS 6.0 to VS .NET 2003 and I get a linker error error LNK2001: unresolved external symbol ___security_cookie or error LNK2001: unresolved external symbol ___security_cookie Does anybody knows where does this symbol comes from? Is it because I am using a wr...more >>

I have developed an Ole DB provider using Visual Studio.NET ATL and C++. What is the best was to redistribute this. Are the any free installation packages about, do I even require an installation package or is there an easier way to register it. Thanks, Duncan. ...more >>

Hi, In my current ATL server project, I have to parse the input in the client application's request to find out the different combination of parameters, instead of using SOAP. For this reason, I am not using ATL server web service project. On client side, I use POST to send XML to web ser...more >>

i haven't the scroibble in my cd of visual c++ if someone can help me for find this in the net because i hope to learn how can i use visual c++ for developping my applications with interface thanks rym.benhaddada@noos.fr...more >>

I'm trying to finish a program that gives a test for the user. The test has four options to choose from, 1. addition 2. subtraction 3. multiplication 4. division. Once the user picks one of the choices above the program will give a specific amount of mathematical problems u...more >>

Hello. I recently came across something that baffled me regarding floating point calculations. I use Microsoft Visual C++ version 6 on a Windows 2000 machine. All my variables are type double. After compiling a program in Debug mode and then running the program, it correctly calculate...more >>

I am having some template problems in VC7.1 The following code should compile fine but I get the error: 'warning C4667: 'void F(Traits<T>::P)' : no function template defined that matches forced instantiation' However if I instantiate the function implicitly by using it in some...more >>

In upsizing some old VC6 code, I've come across the following problem regarding MAKEINTRESOURCE. In the old version, there was code along the lines of: m_pListBox.AddString(CString(MAKEINTRESOURCE(IDS_TESTSTRING))); If you however turn on managed extensions, this code fails. (A workaro...more >>

How can i (using Managed C++) convert a System::String object containing basic text into a char* object? Thanks in advance, Tim ...more >>