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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 hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow){ 
    
    WNDCLASS        windowclass; 
    HWND            hWnd; 
    MSG             msg; 

    static TCHAR szClassName[] = TEXT("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.cbWndExtra = 0; 
    windowclass.hInstance = hInstance;
    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(!RegisterClass(&windowclass)) return 0; 

    hWnd = CreateWindow (   
                            szClassName, 
                            TEXT("Das erste Fenster!"), 
                            WS_OVERLAPPEDWINDOW | WS_VISIBLE, 
                            100, 100, 
                            300, 250, 
                            NULL, 
                            NULL, 
                            hInstance, 
                            NULL); 

    //if(hWnd == NULL) return 0; 


     ShowWindow (hWnd, iCmdShow) ;
     UpdateWindow (hWnd) ;



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

    return msg.wParam; 
}        //winmain 


LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) 
{ 

    HDC hdc;
    PAINTSTRUCT ps ;
    RECT        rect ;

    switch(message) 
    { 

     case WM_PAINT:
          hdc = BeginPaint (hWnd, &ps) ;
          
          GetClientRect (hWnd, &rect) ;
          
          DrawText (hdc, TEXT ("Hallo, Zeus. Du schaffst es!"), -1, &rect,
                    DT_SINGLELINE | DT_CENTER | DT_VCENTER) ;

          EndPaint (hWnd, &ps) ;
          return 0 ;




    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)); 
}