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C-/C++-Quelltext

# include <windows.h>

LRESULT CALLBACK WindowProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam); //callback


int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInstance, LPSTR lpcmdline, int ncmdshow){
    
    WNDCLASSEX  windowclass;
    HWND        hWnd;
    MSG         message;

    const char szClassName[] = "Das erste Fenster";

    windowclass.cbSize = sizeof(WNDCLASSEX);        //zwischensp. größe struct


    windowclass.style = CS_HREDRAW | CS_VREDRAW;    //neuzeichnen des feinsters bei verschiebung


    windowclass.lpfnWndProc = WindowProc;           // pointer @ callback


    windowclass.cbClsExtra = 0;
    windowclass.cbClsExtra = 0;

    windowclass.hIcon   = LoadIcon(NULL, IDI_APPLICATION);
    windowclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
    windowclass.hCursor = LoadCursor (NULL, IDC_ARROW);

    windowclass.hbrBackground = (HBRUSH) COLOR_BACKGROUND+1;

    windowclass.lpszMenuName = NULL;

    windowclass.lpszClassName = szClassName;

    if(!RegisterClassEx(&windowclass)) return 0;

    hWnd = CreateWindowEx ( NULL,
                            szClassName,
                            "Das erste Fenster!",
                            WS_OVERLAPPEDWINDOW | WS_VISIBLE,
                            100, 100,
                            300, 250,
                            NULL,
                            NULL,
                            hInst,
                            NULL);

    if(hWnd == NULL) return 0;

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

    return(int)(message.wParam);
}       //winmain


LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch(message)
    {
    case WM_DESTROY:
        {
            PostQuitMessage(0);
            return 0;
        }
    case WM_KEYDOWN:
        {
            switch(wParam)
            {
            case VK_ESCAPE:
                {
                    PostQuitMessage(0);
                    return 0;
                }
            }
        } break;
    }

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