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C-/C++-Quelltext

#include <windows.h>

const char pcAppName[] = "Testapplication";

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain(HINSTANCE hInst,
                   HINSTANCE hPrevInst,
                   LPSTR lpCmdLine,
                   int nShowCmd)
{
    HWND        hWnd;
    MSG         msg;
    WNDCLASSEX  wc;

    wc.cbClsExtra       = 0;
    wc.cbSize           = sizeof(WNDCLASSEX);
    wc.cbWndExtra       = 0;
    wc.hbrBackground    = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wc.hCursor          = LoadCursor(hInst, IDC_ARROW);
    wc.hIcon            = LoadIcon(hInst, IDI_APPLICATION);
    wc.hIconSm          = LoadIcon(hInst, IDI_APPLICATION);
    wc.hInstance        = hInst;
    wc.lpfnWndProc      = WndProc;
    wc.lpszClassName    = pcAppName;
    wc.lpszMenuName     = NULL;
    wc.style            = CS_HREDRAW | CS_VREDRAW;

    if(!(RegisterClassEx(&wc)))
    {
        MessageBox(0, "Konnte Fensterklasse nicht initialisieren", pcAppName, MB_OK | MB_ICONASTERISK);
        return 0;
    }

    if(!(hWnd = CreateWindow(pcAppName,
                             pcAppName,
                             WS_OVERLAPPEDWINDOW,
                             CW_USEDEFAULT,
                             CW_USEDEFAULT,
                             CW_USEDEFAULT,
                             CW_USEDEFAULT,
                             0,
                             0,
                             hInst,
                             0)))
    {
        MessageBox(0, "Konnte Fenster nicht erstellen", pcAppName, MB_OK | MB_ICONASTERISK);
        return 0;
    }

    ShowWindow(hWnd, nShowCmd);
    UpdateWindow(hWnd);

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

    return msg.wParam;
}

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);
}

C-/C++-Quelltext

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

        case WM_PAINT:
        {
            break;
        }

        case WM_CLOSE:
        {
            PostQuitMessage(0);
            break;
        }
        
        default:
        {
            return DefWindowProc(hWnd, msg, wParam, lParam);
        }
    }
}