Win32 API 实现系统托盘程序

托盘程序就是运行在系统托盘区域的程序，显示为桌面右下角显示区域的一个小图标。通常托盘程序带有几种功能：托盘菜单，托盘图标，气泡提示，托盘提示。例如QQ收到消息后，会在系统右下角显示闪动QQ图标。

主程序Tray.cpp

#include <windows.h>
#include "resource.h"

#define WM_TRAY (WM_USER + 100)
#define WM_TASKBAR_CREATED RegisterWindowMessage(TEXT("TaskbarCreated"))

#define APP_NAME	TEXT("托盘程序")
#define APP_TIP		TEXT("Win32 API 实现系统托盘程序")

NOTIFYICONDATA nid;		//托盘属性
HMENU hMenu;			//托盘菜单

//实例化托盘
void InitTray(HINSTANCE hInstance, HWND hWnd)
{
	nid.cbSize = sizeof(NOTIFYICONDATA);
	nid.hWnd = hWnd;
	nid.uID = IDI_TRAY;
	nid.uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP | NIF_INFO;
	nid.uCallbackMessage = WM_TRAY;
	nid.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_TRAY));
	lstrcpy(nid.szTip, APP_NAME);

	hMenu = CreatePopupMenu();//生成托盘菜单
	//为托盘菜单添加两个选项
	AppendMenu(hMenu, MF_STRING, ID_SHOW, TEXT("提示"));
	AppendMenu(hMen