以编程方式断开和重新连接显示器 [英] Disconnect and Reconnect Displays Programmatically

问题描述

问题:以编程方式断开和重新连接显示器的最佳方法是什么?

Question: What is the best way to programmatically disconnect and reconnect displays programmatically?

目标:关闭显示器上的视频输出(没有背光的黑屏)，然后再将其打开.想象一下从显示器上拔下视频线，然后再插回去.

The Goal: Kill the video output (black screen with no backlight) on a display and later turn it back on. Imagine unplugging the video cord from the monitor, then plugging it back in.

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互动，但我不知道如何断开其中一个.

I can interact with each display, but I can't figure out how to disconnect one.

它类似于 Windows 7 中屏幕分辨率属性中的断开此显示器":

It is similar to "Disconnect this display" in the Screen Resolution properties in Windows 7:

注意事项:

• 关闭所有显示器上的视频输出不起作用，因为我需要其他显示器保持开启状态.
• 死"显示器上的桌面区域在关闭时不需要可用.此外，如果窗户四处移动也无妨.

参考:

1. SO:启用第二个监视器
2. 如何关闭显示器

推荐答案

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

2) 扩展 Win7Display 以断开显示器:

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 这篇文章:

3) Extend Win7Display to reconnect the display using an answer from this post:

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();

这篇关于以编程方式断开和重新连接显示器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！