c# - 以编程方式断开和重新连接显示

Question

问题以编程方式断开和重新连接显示的最佳方式是什么？

目标:关闭显示器上的视频输出(无背光的黑屏)，然后重新打开。想象一下，从显示器上拔下视频线，然后重新插入。

我的尝试:

// Get the monitor to disable
uint iDevNum = 0;
DISPLAY_DEVICE displayDevice = new DISPLAY_DEVICE();
displayDevice.cb = Marshal.SizeOf(displayDevice);
EnumDisplayDevices(null, iDevNum, ref displayDevice, 0))

DEVMODE devMode = new DEVMODE();
EnumDisplaySettings(displayDevice.DeviceName, 0, ref devMode);

//
// Do something here to disable this display device!
//

// Save the display settings
ChangeDisplaySettingsEx(displayDevice.DeviceName, ref devMode, 
    IntPtr.Zero, ChangeDisplaySettingsFlags.CDS_NONE, IntPtr.Zero);

我可以与每个显示器交互，但我不知道如何断开连接。

它类似于 Windows 7 中屏幕分辨率属性中的“断开此显示器”:

注意事项:

• 关闭所有显示器的视频输出是行不通的，因为我需要其他显示器保持打开状态。
• “死”显示器上的桌面区域在关闭时不需要可用。另外，如果 window 四处移动也没关系。

引用资料:

1. SO: Enabling a Second Monitor
2. How to Turn Off a Monitor

Answer 1

1) 从这里获取 MultiMonitorHelper: https://github.com/ChrisEelmaa/MultiMonitorHelper/tree/master

2) 扩展 Win7Display 以断开显示:

using MultiMonitorHelper.DisplayModels.Win7.Enum;
using MultiMonitorHelper.DisplayModels.Win7.Struct;

/// <summary>
/// Disconnect a display.
/// </summary>
public void DisconnectDisplay(int displayNumber)
{
    // Get the necessary display information
    int numPathArrayElements = -1;
    int numModeInfoArrayElements = -1;
    StatusCode error = CCDWrapper.GetDisplayConfigBufferSizes(
        QueryDisplayFlags.OnlyActivePaths,
        out numPathArrayElements,
        out numModeInfoArrayElements);

    DisplayConfigPathInfo[] pathInfoArray = new DisplayConfigPathInfo[numPathArrayElements];
    DisplayConfigModeInfo[] modeInfoArray = new DisplayConfigModeInfo[numModeInfoArrayElements];
    error = CCDWrapper.QueryDisplayConfig(
        QueryDisplayFlags.OnlyActivePaths,
        ref numPathArrayElements,
        pathInfoArray,
        ref numModeInfoArrayElements,
        modeInfoArray,
        IntPtr.Zero);
    if (error != StatusCode.Success)
    {
        // QueryDisplayConfig failed
    }

    // Check the index
    if (pathInfoArray[displayNumber].sourceInfo.modeInfoIdx < modeInfoArray.Length)
    {
        // Disable and reset the display configuration
        pathInfoArray[displayNumber].flags = DisplayConfigFlags.Zero;
        error = CCDWrapper.SetDisplayConfig(
            pathInfoArray.Length,
            pathInfoArray,
            modeInfoArray.Length,
            modeInfoArray,
            (SdcFlags.Apply | SdcFlags.AllowChanges | SdcFlags.UseSuppliedDisplayConfig));
        if (error != StatusCode.Success)
        {
            // SetDisplayConfig failed
        }
    }
}

3) 使用来自 this post 的答案扩展 Win7Display 以重新连接显示器 :

using System.Diagnostics;

/// <summary>
/// Reconnect all displays.
/// </summary>
public void ReconnectDisplays()
{
    DisplayChanger.Start();
}

private static Process DisplayChanger = new Process
{
    StartInfo =
    {
        CreateNoWindow = true,
        WindowStyle = ProcessWindowStyle.Hidden,
        FileName = "DisplaySwitch.exe",
        Arguments = "/extend"
    }
};

4)更新IDisplay中的方法。

5)实现方法:

IDisplayModel displayModel = DisplayFactory.GetDisplayModel();
List<IDisplay> displayList = displayModel.GetActiveDisplays().ToList();

displayList[0].DisconnectDisplay(0);
displayList[0].ReconnectDisplays();