Windows Mobile中通过代码设置设备声音

最近一个Mobile项目中需要通过代码开启点击屏幕输出声音的功能.首先验证了一下在手边各种类型的Mobile设备在系统设置页面都有设置点击屏幕是否发声的选项.经验证这是一个Windows Mobile的通用选项,那能通过代码控制这个选项么? 答案是肯定的,而且仅仅需要几行代码.

        [DllImport("Coredll.dll")]
        private static extern void AudioUpdateFromRegistry();

        static readonly string KeyVolRegKey = @"HKEY_CURRENT_USER\ControlPanel\Volume";
        public KeyClickVolume KeyClickVolume
        {
            set
            {
                uint[] vals = new uint[] { 0, 1, 0x10002 };
                Registry.SetValue(KeyVolRegKey, "Screen", vals[(int)value], RegistryValueKind.DWord);
                AudioUpdateFromRegistry();
                EventLog(ErrorLevel.Info, String.Empty,string.Format( "Set KeyClickVolume to {0}",value), null);
            }
            get
            {
                switch ((uint)Registry.GetValue(KeyVolRegKey, "Screen", (uint)0x10002))
                {
                    case 0: return KeyClickVolume.Off;
                    case 1: return KeyClickVolume.Soft;
                    case 0x10002:
                    default: return KeyClickVolume.Loud;
                }
            }
        }

 

KeyClickVolume的定义如下:

    public enum KeyClickVolume
    {
        Off = 0,
        Soft,
        Loud
    };

 

另外除了可以设置点击Screen的声音外,你还可以对类似的其它选项进行设置.具体的键值可以参照下图:

 

参考:

http://stackoverflow.com/questions/982934/how-do-you-disable-the-key-click-sound-in-windows-ce

http://go4answers.webhost4life.com/Example/set-phone-volume-please-help-why-55820.aspx