我该如何暂时在C＃中空白Windows-7第二显示器？

我试着用ChangeDisplaySettingsEx设置它的宽度和高度为0，它使显示监视器变为空白，但是当我将W和H设置回来（并恢复dmPosition.x）时，它仍然保持关闭状态。我该如何暂时在C＃中空白Windows-7第二显示器？

我的系统有两个显示器，我试图暂时将其中的一个显示为空白。之后，我需要重新开启它。

下面的代码.................

public static void set_monitor_settings(int devNum, bool monitor_on_off) 
    { 
     if(monitor_on_off) 
      Console.WriteLine("TURN ON ULTRASOUND MONITOR"); 
     else 
      Console.WriteLine("TURN OFF ULTRASOUND MONITOR"); 

     // Init: 
      DISPLAY_DEVICE lpDisplayDevice = new DISPLAY_DEVICE(0);  // OUT 
      DISPLAY_DEVICE monitor_name = new DISPLAY_DEVICE(0);  // OUT 
      DEVMODE display_setting = new DEVMODE(); 
      lpDisplayDevice.cb = Marshal.SizeOf(lpDisplayDevice); 
      display_setting.dmSize = (ushort)Marshal.SizeOf(display_setting); 

     // Set lpDisplayDevice to select 2nd display device: 
      EnumDisplayDevices(null, devNum, ref lpDisplayDevice, 0); 
       Console.WriteLine("\ndevNum =" + devNum); 
       Console.WriteLine("cb =" + lpDisplayDevice.cb); 
       Console.WriteLine("DeviceID =" + lpDisplayDevice.DeviceID); 
       Console.WriteLine("DeviceKey =" + lpDisplayDevice.DeviceKey); 
       Console.WriteLine("DeviceName =" + lpDisplayDevice.DeviceName.Trim()); 
       Console.WriteLine("DeviceString =" + lpDisplayDevice.DeviceString.Trim()); 

     // Open settings of 2nd device: 
     int return_value; 
     if(monitor_on_off) 
     { 
      return_value = EnumDisplaySettings(lpDisplayDevice.DeviceName, 
        0, //ENUM_CURRENT_SETTINGS,           ///////<<<<<<<<< might need to be 0 
        ref display_setting) ; 
     } 
     else 
     { 
      return_value = EnumDisplaySettings(lpDisplayDevice.DeviceName, 
        ENUM_CURRENT_SETTINGS,           ///////<<<<<<<<< might need to be 0 
        ref display_setting); 
     } 
     if(return_value > 0)// Succeeded 
     { 
      Console.WriteLine("Current Mode:\n\t" + 
       "{0}w by {1}h, " + 
       "{2} bit, " + 
       "{3} degrees, " + 
       "{4} hertz", 
       display_setting.dmPelsWidth, 
       display_setting.dmPelsHeight, 
       display_setting.dmBitsPerPel, 
       display_setting.dmDisplayOrientation * 90, 
       display_setting.dmDisplayFrequency); 

      //Console.WriteLine(display_setting.dmDisplayOrientation + "\t = Raw orientation"); 

      display_setting.dmDisplayOrientation = 0; // set landscape orientation to landscape 
      //display_setting.dmDisplayOrientation = 2; // set landscape orientation to landscape upside down 

      if (monitor_on_off) 
      { 
       // Set resolution to G4.1 (April 2013) requirement: 
       display_setting.dmPelsWidth = 1280; 
       display_setting.dmPelsHeight = 1024; 
       display_setting.dmPosition.x = 1200; 
      } 
      else 
      { 
       display_setting.dmPelsWidth = 0; 
       display_setting.dmPelsHeight = 0; 

      } 

      int iRet = ChangeDisplaySettingsEx(lpDisplayDevice.DeviceName, ref display_setting, IntPtr.Zero, CDS_UPDATEREGISTRY, IntPtr.Zero); 
      if (iRet == 0) 
       Console.WriteLine("SUCCESSFUL"); 
      else 
       Console.WriteLine(iRet + "\t = ChangeDisplaySettingsEx return value "); 


     } 
     else 
     { 
      Console.WriteLine(">>> EnumDisplaySettings RETURNED 0. <<<<<<<<<<<<<<"); 
     } 
    }

来源

2013-05-02 Doug Null

这里是我发现并成功使用该解决方案......

[DllImport("user32.dll")] 
    static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam); 

    private const int WM_SYSCOMMAND = 0x0112; 
    private const int SC_MONITORPOWER = 0xF170; 
    private const int MonitorTurnOn = -1; 
    private const int MonitorShutoff = 2; 

    //Turn them off 
    public static void turn_off_monitors() 
    { 
     Form f = new Form(); 

     SendMessage(f.Handle, WM_SYSCOMMAND, (IntPtr)SC_MONITORPOWER, (IntPtr)MonitorShutoff); 
    } 


    //Turn them on 
    public static void turn_on_monitors() 
    { 
     Form f = new Form(); 

     SendMessage(f.Handle, WM_SYSCOMMAND, (IntPtr)SC_MONITORPOWER, (IntPtr)MonitorTurnOn); 
    }

来源

2013-06-05 16:44:39

您可以使用DisplaySwitch应用程序要做到这一点：

String cmd = "DisplaySwitch"; 
String argument = "/internal"; 
System.Diagnostics.Process.Start(cmd, argument);

如果你想

其他监控，使用：

String argument = "/external";

要检索双画面：

String argument = "/extend";

来源

2013-05-02 16:22:54 Xaruth

我该如何暂时在C＃中空白Windows-7第二显示器？

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