我写了一个，小窗口程序，可是不知道如何，相应菜单事件，请指教。
谢谢一楼的提示：
我是在WINDOWS下，用API编程，用C++语言：
//这里是主程序：
/********************************************************************\
*  Windows程序的基本例程
*  standard.c: Source code for standard                 
*                                                    
*  Comments: standard Application                     
*                                                    
*  Functions:                                         
*     WinMain      - Application entry point            
*     MainWndProc  - main window procedure          
*                                                    
\********************************************************************/

/*********************  Header Files  *********************/
#include <windows.h>
/*********************  Prototypes  ***********************/
LRESULT WINAPI MainWndProc( HWND, UINT, WPARAM, LPARAM );

/*******************  Global Variables ********************/
HANDLE ghInstance;

/********************************************************************\
*  Function: int PASCAL WinMain(HINSTANCE, HINSTANCE, LPSTR, int)    
*                                                                    
*  Purpose: Initializes Application                                 
*                                                                    
*  Comments: Register window class, create and display the main      
*            window, and enter message loop.                         
*                                                                    
\********************************************************************/

int PASCAL WinMain( HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPSTR lpszCmdLine,
                   int nCmdShow )
{
    WNDCLASS wc;
    MSG msg;
    HWND hWnd;
    
    if( !hPrevInstance )
    {
        wc.lpszClassName = "standardAppClass";
        wc.lpfnWndProc = MainWndProc;
        wc.style = CS_OWNDC | CS_VREDRAW | CS_HREDRAW;
        wc.hInstance = hInstance;
        wc.hIcon = LoadIcon( NULL, IDI_APPLICATION );
        wc.hCursor = LoadCursor( NULL, IDC_ARROW );
        wc.hbrBackground = (HBRUSH)( COLOR_WINDOW + 1 );
        wc.lpszMenuName = "StandardMenu";
        wc.cbClsExtra = 0;
        wc.cbWndExtra = 0;
        
        RegisterClass( &wc );
    }



    ghInstance = hInstance;
    hWnd = CreateWindow( "standardAppClass",
        "standard Application",
        WS_OVERLAPPEDWINDOW|WS_HSCROLL|WS_VSCROLL,
        0,
        0,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        NULL,
        NULL,
        hInstance,
        NULL
        );

    
    ShowWindow( hWnd, nCmdShow );
//    UpdateWindow(hWnd);
    
    while( GetMessage( &msg, NULL, 0, 0 ) ) {
        TranslateMessage( &msg );
        DispatchMessage( &msg );
    }
    
    return (int)msg.wParam;
}

/********************************************************************\
* Function: LRESULT CALLBACK MainWndProc(HWND, UINT, WPARAM, LPARAM
*                                                                    
*  Purpose: Processes Application Messages                           
*                                                                    
* Comments: The following messages are processed                     
*                                                                    
*           WM_PAINT                                                 
*           WM_LBUTTONDOWN                                          
*           WM_DESTROY                                               
*                                                                    
\********************************************************************/

LRESULT CALLBACK MainWndProc( HWND hWnd, UINT msg, WPARAM wParam,
                             LPARAM lParam )
{
    PAINTSTRUCT ps;
    HDC hDC;
    
    switch( msg ) {
        
        /**************************************************************\
        *     WM_PAINT:                                                
        \**************************************************************/
        
    case WM_PAINT:
        hDC = BeginPaint( hWnd, &ps );
        
        TextOut( hDC, 10, 10, "Hello, World!", 13 );
        
        EndPaint( hWnd, &ps );
        break;
        
        /**************************************************************\
        *    WM_LBUTTONDOWN:                        
        \**************************************************************/
        
    case WM_LBUTTONDOWN:
        MessageBox(NULL, "跨过长城，走向世界！", "^_^", MB_OK);
        break;
        
        /**************************************************************\
        *     WM_DESTROY: PostQuitMessage() is called   
        \**************************************************************/
        
    case WM_DESTROY:
        PostQuitMessage( 0 );
        break;
        
        /**************************************************************\
        *Let the default window proc handle all other messages
        \**************************************************************/
        
    default:
        return( DefWindowProc( hWnd, msg, wParam, lParam ));
    }
    
    return 0;
}
//这里是资源头文件：
//
// Used by STANDARD.RC
//
#define IDM_OPEN                        104
#define IDM_EXIT                        105
#define IDM_CLOSE                        106

#define IDM_COPY                        107
#define IDM_CUT                            108
#define IDM_PASTE                        109
//这里是资源文件：
// resource script.
//
#include "resource.h"
#include "windows.h"

/////////////////////////////////////////////////////////////////////////////
//
// Menu
//

StandardMenu MENU DISCARDABLE
BEGIN
   POPUP "文件"
    BEGIN
        MENUITEM "打开",                        IDM_OPEN
        MENUITEM "关闭",                        IDM_CLOSE
        MENUITEM "退出",                        IDM_EXIT
    END
    POPUP "编辑"
    BEGIN
        MENUITEM "复制",                        IDM_COPY
        MENUITEM "剪切",                        IDM_CUT
        MENUITEM "粘贴",                        IDM_PASTE
    END
END