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  • [置顶] C# WINCE调节屏幕亮度

    在wince里面保存屏幕亮度的值保存在注册表HKEY_CURRENT_USERControlPanel\BacklightBrightness里面,值的范围是0-100,所以要改变屏幕的亮度,只要改变这个值,然后重新加载就行代码如下:



    /// <summary>
        /// 调节屏幕的亮度
        /// </summary>
        public class SetBackLight
        {
            public static void SetBright(string strValue)
            {
                SetBackLightValue(strValue);
                ReloadBackLight();
            }
            public static int GetBacklightValue()
            {
                RegistryKey CUser = Registry.CurrentUser;
                RegistryKey Backlight = CUser.OpenSubKey("ControlPanel\Backlight", true);
                return (int)Backlight.GetValue("Brightness", RegistryValueKind.DWord);
            }
            public static void SetBackLightValue(string strValue)
            {
                try
                {
                     
                    RegistryKey hkcu = Registry.CurrentUser;
                    RegistryKey Backlight = hkcu.OpenSubKey("ControlPanel\Backlight", true);
                    Backlight.SetValue("Brightness", strValue, RegistryValueKind.DWord);
                }
                catch (Exception ex)
                {
                    System.Diagnostics.Debug.WriteLine(ex.Message);
                }
            }
    
    
            public static bool ReloadBackLight()
            {
              
                bool ret = false;
                IntPtr scanEvent = NativeWin.CreateEvent(IntPtr.Zero, false, false, "BackLightChangeEvent");
                if (scanEvent == null)
                {
                    throw new Exception("CreateEvent失败");
                }
                else
                {
                    NativeWin.EventModify(scanEvent, EventFlags.SET);
                    NativeWin.CloseHandle(scanEvent);
                    ret = true;
                }
                return ret;
            }
    
    
            partial class NativeWin
            {
                [DllImport("coredll.dll", SetLastError = true, CharSet = CharSet.Auto)]
                internal static extern IntPtr CreateEvent(IntPtr lpEventAttributes, [In, MarshalAs(UnmanagedType.Bool)] bool bManualReset, [In, MarshalAs(UnmanagedType.Bool)] bool bIntialState, [In, MarshalAs(UnmanagedType.BStr)] string lpName);
    
    
                [DllImport("coredll.dll", SetLastError = true, CharSet = CharSet.Auto)]
                [return: MarshalAs(UnmanagedType.Bool)]
                internal static extern bool CloseHandle(IntPtr hObject);
    
    
                [DllImport("coredll.dll", SetLastError = true)]
                [return: MarshalAs(UnmanagedType.Bool)]
                internal static extern bool EventModify(IntPtr hEvent, [In, MarshalAs(UnmanagedType.U4)] EventFlags dEvent);
            }
    
    
            enum EventFlags : int
            {
                PULSE = 1,
                RESET = 2,
                SET = 3
            }
    
    
        }


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  • 原文地址:https://www.cnblogs.com/keanuyaoo/p/3290021.html
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