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C-/C++-Quelltext

#include<windows.h>

//Prototype of Callback-Function
LRESULT CALLBACK WindowProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);

//Main Program

int WINAPI WinMain (HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR lpcmdline, int ncmdshow)
{
    WNDCLASSEX windowclass; //Structure for Windowsettings
    HWND       hWnd;        //Window-Handle
    MSG        message;     //Message

    //The Classname of the Window is free to choose
    const TCHAR szClassName[] = TEXT("Standard Window");

    //Fill in Structures with your Settings

    //Buffer size of Structure
    windowclass.cbSize = sizeof (WNDCLASSEX);

    //Redraw Window if moved
    windowclass.style = CS_HREDRAW | CS_VREDRAW;

    //Pointer on Callback-Function
    windowclass.lpfnWndProc = WindowProc;
    
    //More Settings
    windowclass.cbClsExtra;
    windowclass.cbWndExtra;

    //Save Intstance
    windowclass.hInstance = hInst;

    //Set Icons and Cursors
    windowclass.hIcon   = LoadIcon (NULL, IDI_APPLICATION);
    windowclass.hIconSm = LoadIcon (NULL, IDI_WINLOGO);
    windowclass.hCursor = LoadIcon (NULL, IDC_WAIT);

    //Set Background Colour
    windowclass.hbrBackground = (HBRUSH)COLOR_BACKGROUND+1;

    //Menue
    windowclass.lpszMenuName = NULL;

    //Class Name
    windowclass.lpszClassName = szClassName;

    //Register Windowclass
    if (!RegisterClassEx (&windowclass) )
        return (0);

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

    //Check, if all worked
    if (hWnd == NULL)
        return (0);

    //"Heartbeat" of Program,
    //All Messages will be fetched,
    //translated and redirected here.
    while (GetMessage (&message, NULL, 0, 0) )
    {
        TranslateMessage (&message);
        DispatchMessage (&message);

    }
    //End Program
    return(int)(message.wParam);

}//WinMain

//Callback-Function for Message Processing
//
LRESULT CALLBACK WindowProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    //Analysing Message
    switch (message)
    {
        //Closing Window
    case WM_DESTROY:
        {
            //Send Message to end
            PostQuitMessage (0);
            return(0);
        }
    //Key was pressed
    case WM_KEYDOWN:
        {
            //Switching for each Key pressed
            switch (wParam)
            {
                //"Esc" was pressed
            case VK_ESCAPE:
                {
                    //Send Message to end
                    PostQuitMessage (0);
                    return (0);
                }
            }
        } break;
    }

    //Messages which are not processed by the user
    //will be processed by Windows
    return (DefWindowProc (hWnd, message, wParam, lParam) );

} //WindowProc