No MFC,Only API——菜单的创建和使用
在使用菜单之前，值得一提的是，包含菜单的窗口必须是POPUP-UP或OVERLAPPED风格,才可能拥有菜单。
菜单的创建有三种方法：1，在WINDOWCLASS中指定菜单资源的标识符；2，在CreateWindowEx函数参数中指定菜单句柄；3，先用LoadMenu函数
载入菜单资源，再用SetMenu函数把菜单加载到应用程序的菜单栏。
菜单的操作包含：向已存在菜单添加新的菜单项，删除菜单中的某一项，使菜单项呈现被选中状态，使菜单项无效，创建浮动式菜单，向
Windows系统菜单中添加，删除选项等等。
定位菜单项有两种途径：1，用菜单项的唯一标识符；2，用菜单项的逻辑索引。
菜单项的逻辑索引是这样规定的，菜单栏中的项从左到右的索引依次是0，1，2...，弹出菜单中的项从上到下的索引依次是0，1，2...。
如果想获得菜单某一项的句柄，因先获得菜单条的句柄，在用该菜单项的索引取得句柄。例如：
hMenu=GetMenu(hWnd); //hWnd是窗口句柄
hPopupMenu=GetSubMenu(hMenu,0); //0表示菜单的第一个选项
范例1：演示菜单的各种操作
// begin.cpp : Defines the entry point for the application.
//
#define WIN32_LEAN_AND_MEAN
#include "stdafx.h"
#include "resource.h"
#define ID_NEWITEM 1013 //定义新菜单项的标识符
#define ID_NEWSYSITEM 60441 //定义新系统菜单项标识符
LRESULT CALLBACK MainProc(HWND,UINT,WPARAM,LPARAM); //主窗口函数
BOOL WINAPI DoDispPopupMenu(HWND,int,int); //创建弹出式菜单
VOID WINAPI DoDispMessage(int); //显示相关信息
VOID WINAPI DoInsertMenuItem(void); //向已有菜单中插入新项
VOID WINAPI DoDeleteMenuItem(void); //删除菜单中的选项
VOID WINAPI DoCheckMenuItem(void); //设置菜单项为选中标志
VOID WINAPI DoCheckRadio(void); //设置菜单项为单选标志
VOID WINAPI DoInsertSysMenu(void); //向系统菜单中插入新项
char szAppName[]="Begin";
HINSTANCE hIns;
HWND hMainWnd;
BOOL isInsert; //插入菜单标志
BOOL isCheck; //选中标志
int idRadio=2; //单选标志
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
MSG msg;
HWND hWnd;
WNDCLASSEX wc;
wc.cbClsExtra = 0;
wc.cbSize = sizeof(WNDCLASSEX);
wc.cbWndExtra = 0;
wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wc.hCursor = LoadCursor(NULL,IDC_ARROW);
wc.hIcon = LoadIcon(NULL,IDI_APPLICATION);
wc.hIconSm = 0;
wc.hInstance = hInstance;
wc.lpfnWndProc = (WNDPROC)MainProc;
wc.lpszClassName = szAppName;
wc.lpszMenuName = MAKEINTRESOURCE(IDR_MENU1);
wc.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS | CS_OWNDC;
RegisterClassEx(&wc);
hWnd=CreateWindowEx(0, szAppName, szAppName, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,CW_USEDEFAULT,
NULL,NULL,hInstance,NULL);
hMainWnd=hWnd;
hIns=hInstance;
//在此处向系统菜单中插入菜单项
DoInsertSysMenu();
ShowWindow(hWnd,nCmdShow);
UpdateWindow(hWnd);
while(GetMessage(&msg,NULL,0,0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}
LRESULT CALLBACK MainProc(HWND hWnd,UINT message, WPARAM wParam,LPARAM lParam)
{
HDC hdc;
PAINTSTRUCT ps;
switch(message)
{
case WM_CREATE:
return 0;
case WM_PAINT:
hdc=BeginPaint(hWnd,&ps);
//do drawing
EndPaint(hWnd,&ps);
return 0;
case WM_RBUTTONDOWN:
//鼠标在窗口中右键被按下时，弹出浮动式菜单
if(DoDispPopupMenu(hWnd,LOWORD(lParam),HIWORD(lParam)))
return 0; //函数调用成功
else
break; //函数调用失败
case WM_COMMAND:
switch(LOWORD(wParam))
{
case ID_INSERT:
if(isInsert==0)
{
//插入新的菜单项
DoInsertMenuItem();
//显示相关信息
DoDispMessage(4);
}
break;
case ID_NEWITEM:
DoDispMessage(3);
break;
case ID_DELETE:
if(isInsert!=0)
{
//删除菜单项
DoDeleteMenuItem();
DoDispMessage(5);
}
break;
case IDEXIT:
PostQuitMessage(0);
break;
case ID_CHECK:
//在菜单选项前打钩
DoCheckMenuItem();
break;
case ID_RADIO1:
//在菜单选项前做一圆形标志，表明此项被选中，并清除旧的标志
idRadio=2;
DoCheckRadio();
break;
case ID_RADIO2: //同上
idRadio=3;
DoCheckRadio();
break;
case ID_RADIO3: //同上
idRadio=4;
DoCheckRadio();
break;
case ID_FLOAT1: //浮动菜单的选项被选中时的处理
DoDispMessage(0);
break;
case ID_FLOAT2: //同上
DoDispMessage(1);
break;
case ID_FLOAT3: //同上
DoDispMessage(2);
break;
}
return 0;
case WM_CLOSE:
PostQuitMessage(0);
return 0;
}
return DefWindowProc(hWnd,message,wParam,lParam);
}
BOOL WINAPI DoDispPopupMenu(HWND hWnd,int x,int y)
{
HMENU hMenu;
HMENU hPopupMenu;
POINT pt={x,y};
//从资源文件中载入菜单资源
hMenu=LoadMenu(hIns,MAKEINTRESOURCE(IDR_MENU2));
//获得子菜单的句柄
hPopupMenu=GetSubMenu(hMenu,0);
//窗口坐标转化到屏幕坐标
ClientToScreen(hMainWnd,&pt);
//创建浮动菜单
if(TrackPopupMenu(hPopupMenu, TPM_LEFTALIGN | TPM_RIGHTBUTTON, pt.x, pt.y, 0, hMainWnd, NULL)==FALSE)
return FALSE;
//使用完毕，回收内存
DestroyMenu(hMenu);
return TRUE;
}
VOID WINAPI DoDispMessage(int id)
{
//在菜单事件发生时，输出相应的字符串
HDC hdc;
char *mess[] = {
"Command Floating Menuitem 1 ",
"Command Floating Menuitem 2 ",
"Command Floating Menuitem 3 ",
"Command New Menu Item ",
"New Item Have Been Inserted ",
"New Item Have Been Deleted "
};
InvalidateRect(hMainWnd,NULL,FALSE);
hdc=GetDC(hMainWnd);
TextOut(hdc,0,0,mess[id],strlen(mess[id]));
ReleaseDC(hMainWnd,hdc);
}
VOID WINAPI DoInsertMenuItem()
{
//插入菜单项
HMENU hMenu;
HMENU hPopupMenu;
MENUITEMINFO info;
//每一个新插入的菜单项都必须填写MENUITEMINFO结构
info.cbSize = sizeof(MENUITEMINFO);
info.fMask = MFT_STRING | MIIM_DATA | MIIM_ID | MIIM_TYPE;
info.fType = MFT_STRING;
info.fState = 0;
info.wID = ID_NEWITEM;
info.hSubMenu = NULL;
info.hbmpChecked = NULL;
info.hbmpUnchecked = NULL;
info.dwItemData = ID_NEWITEM;
info.dwTypeData = "New Item";
info.cch = 8;
//获得已存在菜单的句柄
hMenu=GetMenu(hMainWnd);
//获得子菜单的句柄
hPopupMenu=GetSubMenu(hMenu,0);
//插入菜单项
InsertMenuItem(hPopupMenu,1,TRUE,&info);
//置插入标志为1
isInsert=1;
}
VOID WINAPI DoDeleteMenuItem()
{
//删除菜单项
HMENU hMenu;
HMENU hPopupMenu;
hMenu=GetMenu(hMainWnd);
hPopupMenu=GetSubMenu(hMenu,0);
RemoveMenu(hPopupMenu,ID_NEWITEM,MF_BYCOMMAND);
isInsert=0;
}
VOID WINAPI DoCheckMenuItem()
{
//此函数先判断菜单项是否被打钩，若没有，则做打钩标记
//若已有，则删除打钩标记
HMENU hMenu;
HMENU hPopupMenu;
hMenu=GetMenu(hMainWnd);
hPopupMenu=GetSubMenu(hMenu,1);
if(isCheck)
{
CheckMenuItem(hPopupMenu,0,MF_BYPOSITION | MF_UNCHECKED);
isCheck=0;
}
else
{
CheckMenuItem(hPopupMenu,0,MF_BYPOSITION | MF_CHECKED);
isCheck=1;
}
}
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