C#操作电脑多显示器设置

电脑多显示器设置

第一种方式

通过使用api函数SetDisplayConfig来设置。这种方式在某些电脑中设置有几率会导致电脑黑屏

使用代码如下：

private const uint SDC_APPLY = 0x00000080;

private const uint SDC_TOPOLOGY_INTERNAL = 0x00000001;

private const uint SDC_TOPOLOGY_CLONE = 0x00000002;

private const uint SDC_TOPOLOGY_EXTERNAL = 0x00000008;

private const uint SDC_TOPOLOGY_EXTEND = 0x00000004;

[DllImport("user32.dll", CharSet = CharSet.Unicode)]
private static extern long SetDisplayConfig(uint numPathArrayElements, IntPtr pathArray, uint numModeArrayElements, IntPtr modeArray, uint flags);

/// <summary>
/// 设置屏幕的显示模式
/// </summary>
/// <param name="type">模式(0 - 主屏  1 - 双屏复制  2 - 双屏扩展  3 - 第二屏幕</param>
/// <returns></returns>
public static void SetScreenMode(int type)
{
    uint smode;

    switch (type)
    {
        case 0:
            smode = SDC_APPLY | SDC_TOPOLOGY_INTERNAL;
            break;
        case 1:
            smode = SDC_APPLY | SDC_TOPOLOGY_CLONE;
            break;
        case 2:
            smode = SDC_APPLY | SDC_TOPOLOGY_EXTEND;
            break;
        case 3:
            smode = SDC_APPLY | SDC_TOPOLOGY_EXTERNAL;
            break;
        default:
            smode = SDC_APPLY | SDC_TOPOLOGY_INTERNAL;
            break;
    }

    SetDisplayConfig(0, IntPtr.Zero, 0, IntPtr.Zero, smode);
}

第二种方式

使用系统自带的displayswitch.exe，该文件在C:\Windows\System32\DisplaySwitch.exe中，可以使用Process来调用cmd.exe来执行displaySwitch.exe带参数的命令，当然你也可以直接执行已写好脚本的.bat文件。

其中包含的参数示意：

仅电脑屏幕 displayswitch /internal

复制 displayswitch /clone

扩展 displayswitch /extend

仅第二屏幕 displayswitch /external

示例代码如下：

 public enum DisplaySwitchEnum
 {
     Default,
     /// <summary>
     /// 仅电脑屏幕
     /// </summary>
     Internal,
     /// <summary>
     /// 复制屏
     /// </summary>
     Clone,
     /// <summary>
     /// 扩展屏
     /// </summary>
     Extend,
     /// <summary>
     /// 仅第二屏幕
     /// </summary>
     External
 }
public static void DisplaySwitch(DisplaySwitchEnum displaySwitch)
{
    Process process = new Process();
    string str = Environment.GetEnvironmentVariable("windir");//获取系统目录
    string dir = "System32";
    if (!Environment.Is64BitProcess)
    {
        dir = "SysNative";//非64位进程的使用这个目录
    }
    process.StartInfo.WorkingDirectory = System.IO.Path.Combine(str, dir);

    process.StartInfo.FileName = "cmd.exe";
    process.StartInfo.UseShellExecute = false;
    process.StartInfo.RedirectStandardInput = true;
    process.StartInfo.CreateNoWindow = true;
    process.Start();
    string cmd = string.Empty;
    switch (displaySwitch)
    {
        case DisplaySwitchEnum.Clone:
            cmd = "displayswitch.exe /clone";
            break;
        case DisplaySwitchEnum.Extend:
            cmd = "displayswitch.exe /extend";
            break;
        case DisplaySwitchEnum.External:
            cmd = "displayswitch.exe /external";
            break;
        case DisplaySwitchEnum.Internal:
            cmd = "displayswitch.exe /internal";
            break;
    }
    process.StandardInput.WriteLine(cmd);
    process.Close();
}