normal code goes wrong with MVS++

Hi guys, i've been facing this problem with my winAPI32 program.
this is the infamous code

Code:

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#include <windows.h>

HWND      gMainWnd = 0;
HINSTANCE gAppInst = 0;

LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
        switch(msg)
        {
        case WM_CREATE:
                return 0;

        case WM_DESTROY:
                PostQuitMessage(0);
                return 0;
        }

        return DefWindowProc(hWnd, msg, wParam, lParam);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR cmdLine, int showWnd)
{
        const char* className = "RTS-test";
       
        gAppInst = hInstance;

        WNDCLASS wc;
        wc.style        = CS_HREDRAW | CS_VREDRAW;
        wc.lpfnWndProc  = WndProc;
        wc.cbClsExtra    = 0;
        wc.cbWndExtra    = 0;
        wc.hInstance    = gAppInst;
        wc.hIcon        = ::LoadIcon(0, IDI_APPLICATION);
        wc.hCursor      = ::LoadCursor(0, IDC_ARROW);
        wc.lpszMenuName  = 0;
        wc.lpszClassName = className;

        if(RegisterClass(&wc) == 0)
        {
                MessageBox(0, "RegisterClass(&wc) function failed.", "Critical error", MB_OK);
                return 0;
        }

        gMainWnd = ::CreateWindow(className, "CAPTION HERE", WS_OVERLAPPED, 0, 0, 500, 500, 0, 0, gAppInst, 0);

        if(gMainWnd == 0)
        {
                MessageBox(0, "CreateWindow function failed.", "Critical error.", MB_OK);
                return 0;
        }

        ShowWindow(gMainWnd, showWnd);
        UpdateWindow(gMainWnd);

        MSG msg;
        ZeroMemory(&msg, sizeof(MSG));

        while(GetMessage(&msg, 0, 0, 0))
        {
                TranslateMessage(&msg);
                DispatchMessage(&msg);
        }

        return (int)msg.wParam;
}

---

when I debug it, the

Code:

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MessageBox(0, "RegisterClass(&wc) function failed.", "Critical error", MB_OK);

---

pops up, then moving the mouse a little gives me this:
http://img356.imageshack.us/img356/1813/errorey1.gif

i'm working on Microsoft Visual Studio 2005 pro

what gives?

All that's telling you is that you don't have the source code for MessageBox(). Which seems likely, since that belongs to MS.

But if you use the debugger to display the stack trace, the click on the stack frame for WinMain() you should see your code.
If you don't, then check you compiled the debug version.

i don't think so, since i already have included

Code:

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#include <windows.h>

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i don't get this error before I uninstalled MVS, but after a new installation i get this error :(

Quote:

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Originally Posted by Hussain Hani

i don't think so, since i already have included

Code:

---

#include <windows.h>

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i don't get this error before I uninstalled MVS, but after a new installation i get this error :(

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But that only contains the declaration of the MessageBox function - not the actual code that goes on when you call the function. The source code for MessageBox is NOT ON YOUR MACHINE (unless you have a license for Windows source code, and it's highly likely that you fall into the "you don't" variant in this case - you would know that you do, since you'd have to be in a room that is secure and locked 24/7 with special legal [contract law, not criminal law, but still LAW] restrictions on who can enter, etc).

--
Mats

Code:

---

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR cmdLine, int showWnd)
{
        const char* className = "RTS-test";
       
        gAppInst = hInstance;

        WNDCLASS wc = {0};       
        wc.style        = CS_HREDRAW | CS_VREDRAW;
        wc.lpfnWndProc  = WndProc;
        wc.cbClsExtra    = 0;
        wc.cbWndExtra    = 0;
        wc.hInstance    = gAppInst;
        wc.hIcon        = ::LoadIcon(0, IDI_APPLICATION);
        wc.hCursor      = ::LoadCursor(0, IDC_ARROW);
        wc.lpszMenuName  = 0;
        wc.lpszClassName = className;

        if(RegisterClass(&wc) == 0)
        {
                MessageBox(0, "RegisterClass(&wc) function failed.", "Critical error", MB_OK);
                return 0;
        }

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