#region 屏幕亮度
[DllImport("dxva2.dll")]
public static extern bool SetMonitorBrightness(IntPtr hMonitor, short brightness);
[DllImport("dxva2.dll")]
public static extern bool GetMonitorBrightness(IntPtr hMonitor, ref short pdwMinimumBrightness,
    ref short pdwCurrentBrightness, ref short pdwMaximumBrightness);
[DllImport("dxva2.dll")]
public static extern bool GetNumberOfPhysicalMonitorsFromHMONITOR(IntPtr hMonitor,
    ref uint pdwNumberOfPhysicalMonitors);
[DllImport("dxva2.dll")]
public static extern bool GetPhysicalMonitorsFromHMONITOR(IntPtr hMonitor,
    uint dwPhysicalMonitorArraySize, [Out] PhysicalMonitor[] pPhysicalMonitorArray);
[DllImport("user32.dll")]
public static extern IntPtr MonitorFromWindow([In] IntPtr hwnd, uint dwFlags);
#endregion

/// <summary>
/// 物理常量
/// </summary>
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct PhysicalMonitor
    public IntPtr hPhysicalMonitor;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
    public string szPhysicalMonitorDescription;
/// <summary>
/// 设置屏幕亮度
/// </summary>
/// <param name="handle">所在屏幕窗口的句柄</param>
/// <param name="brightness">亮度</param>
/// <returns></returns>
public static bool SetBrightness(IntPtr handle, short brightness)
    if (handle == IntPtr.Zero)
        return false;
    uint pdwNumberOfPhysicalMonitors = uint.MinValue;
    //获取屏幕所在的屏幕设备
    var hMonitor = MonitorFromWindow(handle, 1);
    GetNumberOfPhysicalMonitorsFromHMONITOR(hMonitor, ref pdwNumberOfPhysicalMonitors);
    var screen = new PhysicalMonitor[pdwNumberOfPhysicalMonitors];
    GetPhysicalMonitorsFromHMONITOR(hMonitor, pdwNumberOfPhysicalMonitors, screen);
    return screen.Length <= 0 ? false : SetMonitorBrightness(screen[0].hPhysicalMonitor, brightness);
/// <summary>
/// 得到屏幕亮度参数
/// </summary>
/// <param name="handle">所在屏幕窗口的句柄</param>
/// <param name="minBrightness">最小亮度</param>
/// <param name="currentBrightness">当前亮度</param>
/// <param name="maxBrightness">最大亮度</param>
/// <returns></returns>
public static bool GetBrightness(IntPtr handle, ref short minBrightness,
    ref short currentBrightness,
    ref short maxBrightness)
    if (handle == IntPtr.Zero)
        return false;
    uint pdwNumberOfPhysicalMonitors = uint.MinValue;
    //获取屏幕所在的屏幕设备
    var hMonitor = MonitorFromWindow(handle, 1);
    GetNumberOfPhysicalMonitorsFromHMONITOR(hMonitor, ref pdwNumberOfPhysicalMonitors);
    var screen = new PhysicalMonitor[pdwNumberOfPhysicalMonitors];
    GetPhysicalMonitorsFromHMONITOR(hMonitor, pdwNumberOfPhysicalMonitors, screen);
    return screen.Length <= 0 ? false : GetMonitorBrightness(screen[0].hPhysicalMonitor, ref minBrightness,
        ref currentBrightness,
        ref maxBrightness);
DialogTool.SetBrightness(this.Handle, 45);
short minBrightness = 0;
short currentBrightness = 0;
short maxBrightness = 0;
DialogTool.GetBrightness(this.Handle,
    ref minBrightness,
    ref currentBrightness,
    ref maxBrightness);
Trace.WriteLine($"最小：{minBrightness},当前亮度:{currentBrightness},最大亮度:{maxBrightness}");
 
				
C#读取和调节屏幕亮度，注意是亮度，不是对比度！
ObjectQuery query = new ObjectQuery("SELECT * FROM WmiMonitorBrightness");//读取
new Object[] { UInt32.MaxValue, targetBrightness });//设置
				
[code="java"]WindowManager.LayoutParams lp = getWindow().getAttributes(); 
    lp.screenBrightness = 1.0f; 
getWindow().setAttributes(lp);
[/code]
				
Github:https://github.com/CHNMaxGor/AjustScreenBrightness
方法一: 使用网上常说的 Gdi32.dll 下的 SetDeviceGammaRamp (修改系统Gamma)
DllImport("gdi32.dll")]
public static extern bool GetDeviceGammaRamp(In...
private void GetScreenLight()
 ManagementScope scope = new ManagementScope("\\\\.\\ROOT\\WMI");
 //create object query
 ObjectQuery query = new ObjectQuery("SELECT * FROM WmiMonitorBrightness");
				
 SetBrightness(int.Parse(statics));//参数是亮度参数
 [DllImport("gdi32.dll")]
        private unsafe static extern bool SetDeviceGammaRamp(Int32 hdc, void* ramp);
        private static bool initialized = fa...
				
        try {
            IPowerManager power = IPowerManager.Stub.asInterface(
                    ServiceManager.getService("power"));
            if (power != null) {
                power.setB...
				
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这个工程基于FFmpeg和DXVA2技术，实现了一个简单的视频播放器。使用DXVA2技术可以加速视频的解码，解决了传统软件解码的卡顿和占用CPU资源的问题。同时，使用FFmpeg作为音视频框架，可以支持大量的媒体格式，实现多种媒体文件的播放。
这个工程源代码开放，可以通过Visual Studio进行编译和调试。对于需要实现视频播放的开发者，可以使用这个工程作为参考，了解视频播放的相关知识和技术，实现更高效、稳定的视频播放器。
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