Question

我正在做一个c＃窗口项目，捕获RDC上每个键盘事件的屏幕截图。在这个项目中，我使用WH_KEYBOARD_LL钩子来捕捉键盘事件和微软的RDC。

问题是远程机器的远程会话是否已经存在意味着有人使用该远程计算机并在未注销的情况下断开连接，WH_KEYBOARD_LL hook无法在RDC的全屏模式下捕获键盘事件。

因此无法捕获图像。此问题发生在Microsoft server 2008 r2 64 bit上。

我尽可能多地搜索这个。我还是找不到解决办法。

拜托，有人帮我解决这个问题。

编辑：我在代码项目中使用了Gma.Useractivity项目。

     In this project, following is the route given by Gma.Useractivty project to add custom event handler

     public static event KeyEventHandler KeyUp
     {
        add
        {
            EnsureSubscribedToGlobalKeyboardEvents();
            s_KeyUp += value;
        }
        remove
        {
            s_KeyUp -= value;
            TryUnsubscribeFromGlobalKeyboardEvents();
        }
      }


      private static void EnsureSubscribedToGlobalKeyboardEvents()
    {
        // install Keyboard hook only if it is not installed and must be installed
        if (s_KeyboardHookHandle == 0)
        {
            //See comment of this field. To avoid GC to clean it up.
            s_KeyboardDelegate = KeyboardHookProc;
            //install hook
            s_KeyboardHookHandle = SetWindowsHookEx(
                WH_KEYBOARD_LL,
                s_KeyboardDelegate,
                Marshal.GetHINSTANCE(
                    Assembly.GetExecutingAssembly().GetModules()[0]),
                0);
            //If SetWindowsHookEx fails.
            if (s_KeyboardHookHandle == 0)
            {

                //Returns the error code returned by the last unmanaged function called using platform invoke that has the DllImportAttribute.SetLastError flag set. 
                int errorCode = Marshal.GetLastWin32Error();
                //do cleanup


                //Initializes and throws a new instance of the Win32Exception class with the specified error. 
                throw new Exception("@@@ Gma.UserActivityMonitor >> HookeManager.Callbacks.cs [" + "Creating Keyboard Hook is fail] @@@");


            }                     
        }
    }


    I registered my keyboard event handler in the form load as following...

private void RDR9902_Load（object sender，EventArgs e） {

        rdpProductionNode.FullScreenTitle = "????????(" + CommonData.userID + ")";
        WinAPI.SetWinFullScreen(this.Handle);

        HookManager.KeyDown += new KeyEventHandler(HookManager_KeyDown);
        HookManager.KeyUp += new KeyEventHandler(HookManager_KeyUp);
        HookManager.MouseUp += new MouseEventHandler(HookManager_MouseUp);
    }

当RDC处于全屏模式时，WH_KEYBOARD_LL无法捕获键盘事件

0 个答案: