C# 模拟CTRL+ALT+DELETE按键失败是怎么回事，感觉代码没问题

VagGrant 2017-09-04 11:42:46

想要客户端通过TCP发送命令通知Server执行CTRL+ALT+DELETE命令。（并不是远程桌面，客户端不会先登录）
根据TightVLC的C++代码和其他一些资料转成C#了。所有的返回都是正确的。但是就是不会切换到登录界面。
服务器是以windowservice启动的

求大神解答！！

附上代码：



private static void SimalateCtrlAltDelete()

        {

//查看当前weindowstation和desttop信息是否正确，

            uint ld = 0;

            IntPtr pt = NativeMethods.GetProcessWindowStation();

            var sda = NativeMethods.GetUserObjectInformation(pt, 2, null, 0, ref ld);

            byte[] a = new byte[ld];

            sda = NativeMethods.GetUserObjectInformation(pt, 2, a, ld, ref ld);

            string dsada = Encoding.Unicode.GetString(a);

//输出  Service-0x0-3e7$2

            System.Diagnostics.Debug.Print($"1##{dsada}\n");

            IntPtr oldDesk = NativeMethods.GetThreadDesktop(NativeMethods.GetCurrentThreadId());

            sda = NativeMethods.GetUserObjectInformation(oldDesk, 2, null, 0, ref ld);

            a = new byte[ld];

            sda = NativeMethods.GetUserObjectInformation(oldDesk, 2, a, ld, ref ld);

            dsada = Encoding.Unicode.GetString(a);

//输出  Default

            System.Diagnostics.Debug.Print($"2##{dsada}\n");

            IntPtr window = NativeMethods.OpenWindowStation("WinSta0", false, 0x0004 | 0x0020 | 0x0008 | 0x0001 | 0x0100 | 0x0040 | 0x0002 | 0x0200 | 0x0010);

            var sdad = NativeMethods.SetProcessWindowStation(window);

            sda = NativeMethods.GetUserObjectInformation(window, 2, null, 0, ref ld);

            a = new byte[ld];

            sda = NativeMethods.GetUserObjectInformation(window, 2, a, ld, ref ld);

            dsada = Encoding.Unicode.GetString(a);

            System.Diagnostics.Debug.Print($"3##{dsada}\n");

//能正确返回 Winlogon桌面

            IntPtr newDesk = NativeMethods.OpenDesktop("WinLogon", 0, false, 0x0004 | 0x0002 | 0x0040 | 0x0008 | 0x0020 | 0x0010 | 0x0001 | 0x0100 | 0x0080);

            var aaaa = NativeMethods.SetThreadDesktop(newDesk);

            sda = NativeMethods.GetUserObjectInformation(newDesk, 2, null, 0, ref ld);

            a = new byte[ld];

            sda = NativeMethods.GetUserObjectInformation(newDesk, 2, a, ld, ref ld);

            dsada = Encoding.Unicode.GetString(a);

            System.Diagnostics.Debug.Print($"4##{dsada}\n");

            //var bbbb = NativeMethods.CloseDesktop(oldDesk);

            //IntPtr ss = NativeMethods.FindWindow("SAS window class", "SAS window");

            //IntPtr ss = NativeMethods.FindWindow(null, "SAS window");

            //System.Diagnostics.Debug.Print($"error: {NativeMethods.GetLastError()}");

//执行后不能切换到 登录界面。。。。

            var adddd = NativeMethods.SendMessage(new IntPtr(0xffff), WM_HOTKEY, 0, MAKELPARAM(MOD_ALT | MOD_CONTROL, VK_DELETE));

            NativeMethods.SetProcessWindowStation(pt);

            NativeMethods.SetThreadDesktop(oldDesk);

            NativeMethods.CloseDesktop(newDesk);

            NativeMethods.CloseWindowStation(window);

        }