windows API 创建系统托盘图标

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。

[cpp] view
plaincopy





#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;//用于接收鼠标坐标

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);//取鼠标坐标

::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;

}