WM_COMMAND产生的条件

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#include<windows.h>
#include "allmenu.h"
#include<iostream>
using namespace std;
HMENU hmenu;
HMENU haddmenu;

//窗口函数
LRESULT CALLBACK WndProc(HWND hwnd,UINT message,WPARAM wParam,LPARAM lParam)
{
 switch(message){
/* case WM_INIT:
   hmenu=GetMenu(hwnd);//该函数取得分配给指定窗口的菜单的句柄。
   haddmenu=CreateMenu();

   AppendMenu(haddmenu,MF_ENABLED,IDM_OPENBIG,"打开目标图像");
   AppendMenu(haddmenu,HF_ENABLED,IDM_OPENSMALL,"打开模板图像");
   AppendMenu(haddmenu,HF_ENABLED,IDM_EXIT,"退出");

/* case WM_COMMAND:
  switch(LOWORD(wParam))
  {
   hmenu=GetMenu(hwnd);
   haddmenu=CreateMenu();

   AppendMenu(haddmenu,MF_ENABLED,IDM_OPENBIG,"打开目标图像");
   AppendMenu(haddmenu,HF_ENABLED,IDM_OPENSMALL,"打开模板图像");
   AppendMenu(haddmenu,HF_ENABLED,IDM_EXIT,"退出");
  }*/
 case WM_DESTROY:
  PostQuitMessage(0);
  break;
 default:
  return DefWindowProc(hwnd,message,wParam,lParam);
 }
 return 0;
}
//winmain函数
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInst,LPSTR lpszCmdLine,int nCmdShow)
{
 MSG Msg;
 WNDCLASS wndclass;
 HWND hwnd;
 char lpszClassName[]="我的窗口";
 char lpszTitle[]="MyWindows";
 char lpszMenuName[]="menu";
 hmenu=LoadMenu(hInstance,"hmenu");

 wndclass.style=0;
 wndclass.lpfnWndProc=WndProc;
 wndclass.cbClsExtra=0; //窗口类无扩展
 wndclass.cbWndExtra=0; //窗口实例无扩展
 wndclass.hInstance=hInstance; //当前实例句柄
 wndclass.hIcon=LoadIcon(NULL,IDI_APPLICATION); //窗口的最小化图标为默认值
 wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);
 wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);

 wndclass.lpszMenuName=lpszMenuName;
 wndclass.lpszClassName=lpszClassName;

 if(!RegisterClass(&wndclass)){
  MessageBeep(0);
  return false;
 }
 //创建窗口
 hwnd=CreateWindow(
  lpszClassName,
  lpszTitle,
  WS_OVERLAPPEDWINDOW,
  CW_USEDEFAULT,
  CW_USEDEFAULT,
  CW_USEDEFAULT,
  CW_USEDEFAULT,
  NULL,
  hmenu,
  hInstance,
  NULL
  );
 ShowWindow(hwnd,nCmdShow);
 UpdateWindow(hwnd);
 while(GetMessage(&Msg,NULL,0,0)){
  TranslateMessage(&Msg);
  DispatchMessage(&Msg);
 }

 return Msg.wParam;
}
//allmenu.h文件

#define MYMENU 10
#define IDM_OPENSMALL 11

#define IDM_OPENBIG 12
#define IDM_CLOSE 13
#define IDM_EXIT 14