notifyicondata图标通知C

我有一个作为服务运行的应用程序，以及监视服务的辅助应用程序。使用NOTIFYICONDATA在系统托盘中存在监视应用程序，该应用程序正常。

我目前正在尝试做的事情是，当应用程序通知服务停止时，我想显示一条通知（就像电池在笔记本电脑上的电池一样低）。我以本文为基础。我必须执行的功能如下：

void CALLBACK checkit( HWND hwnd, UINT umsg, UINT timerid, DWORD dwtime ) {
    if ( isServiceRunning() ) {
        if ( nidApp.dwInfoFlags != NIIF_NONE ) {
            Log( "dwInfoFlags != NIFF_NONE" );
            nidApp.dwInfoFlags = NIIF_NONE;
            strcpy_s( nidApp.szInfoTitle, sizeof( nidApp.szInfoTitle ), "" );
            strcpy_s( nidApp.szInfo, sizeof( nidApp.szInfoTitle ), "" );
            Log( "%d", Shell_NotifyIcon( NIM_MODIFY, &nidApp ) );
        }
    } else {
        if ( nidApp.dwInfoFlags != NIIF_WARNING ) {
            Log( "dwInfoFlags != NIIF_WARNING" );
            nidApp.dwInfoFlags = NIIF_WARNING;
            strcpy_s( nidApp.szInfoTitle, sizeof( nidApp.szInfoTitle ), "Service Stopped" );
            strcpy_s( nidApp.szInfo, sizeof( nidApp.szInfo ), "The " PROGRAM_NAME " service has been stopped. Any runs in progress have been terminated." );
            nidApp.uTimeout = 10000;
            Log( "%d", Shell_NotifyIcon( NIM_MODIFY, &nidApp ) );
        }
    }
}

此功能每五秒钟称为一次。使用日志，我可以看到dwInfoFlags设置了正确的设置，并且Shell_NotifyIcon返回TRUE，但是，没有显示通知。我敢肯定，我一定会缺少一些东西，但是我无法弄清楚它是什么。

nidApp在CPP文件的顶部定义为NOTIFYICONDATA nidApp;，如下所示：

hMainIcon = LoadIcon( hInstance, (LPCTSTR)MAKEINTRESOURCE( IDI_ICON1 ) );
nidApp.cbSize = sizeof( NOTIFYICONDATA ); // sizeof the struct in bytes
nidApp.hWnd = (HWND)hWnd;            //handle of the window which will process this app. messages
nidApp.uID = IDI_ICON1;       //ID of the icon that willl appear in the system tray
nidApp.uFlags = NIF_ICON | NIF_MESSAGE | NIF_TIP | NIF_GUID | NIF_SHOWTIP; //ORing of all the flags
nidApp.hIcon = hMainIcon; // handle of the Icon to be displayed, obtained from LoadIcon
nidApp.uCallbackMessage = WM_USER_SHELLICON;
nidApp.uVersion = NOTIFYICON_VERSION_4;
nidApp.guidItem = myGUID;
strcpy_s( nidApp.szTip, sizeof( nidApp.szTip ), PROGRAM_NAME " Service Controller" );
Shell_NotifyIcon( NIM_ADD, &nidApp );
Shell_NotifyIcon( NIM_SETVERSION, &nidApp );