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C-/C++-Quelltext

#include <windows.h>
#include <tchar.h>

LRESULT CALLBACK WndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam );
LRESULT CALLBACK EditProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam );

int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow )
{
    MSG msg;
    WNDCLASSEX wc =
    {
        sizeof( WNDCLASSEX ),
        CS_HREDRAW | CS_VREDRAW,
        WndProc,
        0, 0,
        hInstance,
        LoadIcon( NULL, IDI_APPLICATION ),
        LoadCursor( NULL, IDC_ARROW ),
        GetSysColorBrush( COLOR_BTNFACE ),
        NULL,
        _T( "MyCoolWindowClass" ),
        LoadIcon( NULL, IDI_APPLICATION )
    };

    if ( !RegisterClassEx( &wc ) )
    {
        OutputDebugString( _T( "RegisterClassEx failed!" ) );
        return 0;
    }

    HWND hWnd = CreateWindowEx( WS_EX_WINDOWEDGE, _T( "MyCoolWindowClass" ), _T( "Foobar Test" ), 
        WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 800, 600, NULL, NULL, hInstance, NULL );

    if ( !hWnd )
    {
        OutputDebugString( _T( "CreateWindowEx failed!" ) );
        return 0;
    }

    HWND hEdit = CreateWindowEx( WS_EX_CLIENTEDGE, _T( "EDIT" ), _T( "Please press enter..." ), WS_VISIBLE | WS_CHILD, 307, 290, 186, 20, hWnd,
        NULL, hInstance, NULL );

    LONG_PTR pWndProc = SetWindowLongPtr( hEdit, GWL_WNDPROC, ( LONG )EditProc );
    SetWindowLongPtr( hEdit, GWL_USERDATA, pWndProc );

    SetFocus( hEdit );
    ShowWindow( hWnd, SW_SHOW );
    UpdateWindow( hWnd );

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

    return ( int )msg.wParam;
}

LRESULT CALLBACK EditProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
    WNDPROC pWndProc = ( WNDPROC )GetWindowLongPtr( hWnd, GWL_USERDATA );

    switch ( uMsg )
    {
    case WM_KEYDOWN:
        if ( wParam == VK_RETURN )
        {
            MessageBox( hWnd, _T( "Return pressed" ), _T( "Info" ), MB_OK | MB_ICONINFORMATION );
            return FALSE;
        }

    default:
        return CallWindowProc( pWndProc, hWnd, uMsg, wParam, lParam );
    }

    return 0;
}

LRESULT CALLBACK WndProc( HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam )
{
    switch ( uMsg )
    {
    case WM_CLOSE:
        PostQuitMessage( 0 );
        break;

    default:
        return DefWindowProc( hWnd, uMsg, wParam, lParam );
    }

    return 0;
}