使用Win32 API做个系统托盘图标

系统托盘在我们使用的程序中很普遍，下面我们来看一个很不错的例子，使用Win32 API实现，对理解系统托盘有些帮助。

#include <windows.h>
#define IDR_PAUSE 12
#define IDR_START 13
/*
#include <shellapi.h>
#pragma   comment(lib,   "shell32.lib") 
*/
LPCTSTR szAppName = TEXT("服务程序");
LPCTSTR szWndName = TEXT("服务程序");
HMENU hmenu;//菜单句柄


LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
NOTIFYICONDATA nid;
UINT WM_TASKBARCREATED;
POINT pt;//用于接收鼠标座标
int xx;//用于接收菜单选项返回值


// 不要修改TaskbarCreated，这是系统任务栏自定义的消息
WM_TASKBARCREATED = RegisterWindowMessage(TEXT("TaskbarCreated"));
switch (message)
{
case WM_CREATE://窗口创建时候的消息.
nid.cbSize = sizeof(nid);
nid.hWnd = hwnd;
nid.uID = 0;
nid.uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP;
nid.uCallbackMessage = WM_USER;
nid.hIcon = LoadIcon(NULL, IDI_APPLICATION);
lstrcpy(nid.szTip, szAppName);
Shell_NotifyIcon(NIM_ADD, &nid);
hmenu=CreatePopupMenu();//生成菜单
AppendMenu(hmenu,MF_STRING,IDR_PAUSE,"暂停服务");//为菜单添加两个选项
AppendMenu(hmenu,MF_STRING,IDR_START,"恢复服务");
break;
case WM_USER://连续使用该程序时候的消息.
if (lParam == WM_LBUTTONDOWN)
MessageBox(hwnd, TEXT("Win32 API 实现系统托盘程序,双击托盘可以退出!"), szAppName, MB_OK);
if (lParam == WM_LBUTTONDBLCLK)//双击托盘的消息,退出.
SendMessage(hwnd, WM_CLOSE, wParam, lParam);
if (lParam == WM_RBUTTONDOWN)
{
GetCursorPos(&pt);//取鼠标座标
::SetForegroundWindow(hwnd);//解决在菜单外单击左键菜单不消失的问题
EnableMenuItem(hmenu,IDR_PAUSE,MF_GRAYED);//让菜单中的某一项变灰
xx=TrackPopupMenu(hmenu,TPM_RETURNCMD,pt.x,pt.y,NULL,hwnd,NULL);//显示菜单并获取选项ID
if(xx==IDR_PAUSE) MessageBox(hwnd, TEXT("111"), szAppName, MB_OK);
if(xx==IDR_START) MessageBox(hwnd, TEXT("222"), szAppName, MB_OK);
if(xx==0) PostMessage(hwnd,WM_LBUTTONDOWN,NULL,NULL);
//MessageBox(hwnd, TEXT("右键"), szAppName, MB_OK);
}
break;
case WM_DESTROY://窗口销毁时候的消息.
Shell_NotifyIcon(NIM_DELETE, &nid);
PostQuitMessage(0);
break;
default:
/*
* 防止当Explorer.exe 崩溃以后，程序在系统系统托盘中的图标就消失
*
* 原理：Explorer.exe 重新载入后会重建系统任务栏。当系统任务栏建立的时候会向系统内所有
* 注册接收TaskbarCreated 消息的顶级窗口发送一条消息，我们只需要捕捉这个消息，并重建系
* 统托盘的图标即可。
*/
if (message == WM_TASKBARCREATED)
SendMessage(hwnd, WM_CREATE, wParam, lParam);
break;
}
return DefWindowProc(hwnd, message, wParam, lParam);
}


int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
  LPSTR szCmdLine, int iCmdShow)
{
HWND hwnd;
MSG msg;
WNDCLASS wndclass;


HWND handle = FindWindow(NULL, szWndName);
if (handle != NULL)
{
MessageBox(NULL, TEXT("Application is already running"), szAppName, MB_ICONERROR);
return 0;
}


wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;


if (!RegisterClass(&wndclass))
{
MessageBox(NULL, TEXT("This program requires Windows NT!"), szAppName, MB_ICONERROR);
return 0;
}


// 此处使用WS_EX_TOOLWINDOW 属性来隐藏显示在任务栏上的窗口程序按钮
hwnd = CreateWindowEx(WS_EX_TOOLWINDOW,
szAppName, szWndName,
WS_POPUP,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL, NULL, hInstance, NULL);


ShowWindow(hwnd, iCmdShow);
UpdateWindow(hwnd);


while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}