我的問(wèn)題是 PostMessage Windows API 工作不正常，因?yàn)樗趶目刂婆_(tái)應(yīng)用程序運(yùn)行時(shí)工作。工作代碼：我有 2 個(gè)應(yīng)用程序 [1] 是控制臺(tái)應(yīng)用程序 [2] Windows 窗體應(yīng)用程序。要求是我想向所有正在運(yùn)行的應(yīng)用程序?qū)嵗l(fā)送消息?？刂婆_(tái)應(yīng)用程序代碼：class Program{    #region Dll Imports    public const int HWND_BROADCAST = 0xFFFF;    [DllImport("user32.dll")]    public static extern bool SetForegroundWindow(IntPtr hWnd);    [DllImport("user32")]    public static extern bool PostMessage(IntPtr hwnd, int msg, IntPtr wparam, IntPtr lparam);    [DllImport("user32")]    public static extern int RegisterWindowMessage(string message);    #endregion Dll Imports    public static readonly int WM_ACTIVATEAPP = RegisterWindowMessage("CLOSE");    static void Main(string[] args)    {            //we tried to create a mutex, but there's already one (createdNew = false - another app created it before)            //so there's another instance of this application running        Process currentProcess = Process.GetCurrentProcess();        //get the process that has the same name as the current one but a different ID        foreach (Process process in Process.GetProcessesByName("ClientApp1"))        {            if (process.Id != currentProcess.Id)            {                IntPtr handle = process.MainWindowHandle;                //if the handle is non-zero then the main window is visible (but maybe somewhere in the background, that's the reason the user started a new instance)                //so just bring the window to front                //if (handle != IntPtr.Zero)                 }        }    }}上面的代碼按預(yù)期工作。我的問(wèn)題從這里開(kāi)始。我想從 Windows 服務(wù)而不是控制臺(tái)應(yīng)用程序運(yùn)行相同的代碼。需要立即指導(dǎo)。似乎當(dāng)我從 Windows 服務(wù)運(yùn)行此代碼時(shí)，它沒(méi)有掌握進(jìn)程或服務(wù)在不同的帳戶中運(yùn)行，因此沒(méi)有傳遞消息。