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

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#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(hMenu, MF_STRING, ID_EXIT, TEXT("退出"));          Shell_NotifyIcon(NIM_ADD, &nid);  }      //演示托盘气泡提醒  void ShowTrayMsg()  {      lstrcpy(nid.szInfoTitle, APP_NAME);      lstrcpy(nid.szInfo, TEXT("收到一条消息！"));      nid.uTimeout = 1000;      Shell_NotifyIcon(NIM_MODIFY, &nid);  }      LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)  {      switch (uMsg)      {      case WM_TRAY:          switch(lParam)          {          case WM_RBUTTONDOWN:              {                  //获取鼠标坐标                  POINT pt; GetCursorPos(&pt);                      //解决在菜单外单击左键菜单不消失的问题                  SetForegroundWindow(hWnd);                      //使菜单某项变灰                  //EnableMenuItem(hMenu, ID_SHOW, MF_GRAYED);                          //显示并获取选中的菜单                  int cmd = TrackPopupMenu(hMenu, TPM_RETURNCMD, pt.x, pt.y, NULL, hWnd,                       NULL);                  if(cmd == ID_SHOW)                      MessageBox(hWnd, APP_TIP, APP_NAME, MB_OK);                  if(cmd == ID_EXIT)                       PostMessage(hWnd, WM_DESTROY, NULL, NULL);              }              break;          case WM_LBUTTONDOWN:              MessageBox(hWnd, APP_TIP, APP_NAME, MB_OK);              break;          case WM_LBUTTONDBLCLK:              break;          }          break;      case WM_DESTROY:          //窗口销毁时删除托盘          Shell_NotifyIcon(NIM_DELETE, &nid);          PostQuitMessage(0);          break;      case WM_TIMER:          ShowTrayMsg();          KillTimer(hWnd, wParam);          break;      }      if (uMsg == WM_TASKBAR_CREATED)      {          //系统Explorer崩溃重启时，重新加载托盘          Shell_NotifyIcon(NIM_ADD, &nid);      }      return DefWindowProc(hWnd, uMsg, wParam, lParam);  }      int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE /*hPrevInstance*/,       LPSTR /*lpCmdLine*/, int iCmdShow)  {      HWND hWnd;      MSG msg;      WNDCLASS wc = { 0 };      wc.style = NULL;      wc.hIcon = NULL;      wc.cbClsExtra = 0;      wc.cbWndExtra = 0;      wc.hInstance = hInstance;      wc.lpfnWndProc = WndProc;      wc.hbrBackground = NULL;      wc.lpszMenuName = NULL;      wc.lpszClassName = APP_NAME;      wc.hCursor = NULL;          if (!RegisterClass(&wc)) return 0;          hWnd = CreateWindowEx(WS_EX_TOOLWINDOW, APP_NAME, APP_NAME, WS_POPUP, CW_USEDEFAULT,          CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL);          ShowWindow(hWnd, iCmdShow);      UpdateWindow(hWnd);          InitTray(hInstance, hWnd);          //实例化托盘      SetTimer(hWnd, 3, 1000, NULL);      //定时发消息，演示气泡提示功能          while (GetMessage(&msg, NULL, 0, 0))      {          TranslateMessage(&msg);          DispatchMessage(&msg);      }      return msg.wParam;  }

资源头文件 resource.h

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#define IDI_TRAY    101  #define ID_SHOW     40001  #define ID_EXIT     40002

资源文件 resource.rc

 

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#include "resource.h"      IDI_TRAY ICON DISCARDABLE "ico.ico"

编译很简单，使用 Visual Studio建立一个空项目，建好以上3个文件，再找一个ico图标，保存为ico.ico，即可编译。