使用C#调用win32 mciSendCommand 播放音乐

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以下是调用win32播放音乐的类:

public class PlaySound    {        /// <summary>        /// 调用系统API        /// </summary>        /// <param name="lpszCommand"></param>        /// <param name="lpszReturnString"></param>        /// <param name="cchReturn"></param>        /// <param name="hwndCallback"></param>        /// <returns></returns>        [DllImport("winmm.dll", EntryPoint = "mciSendString", SetLastError = true, CharSet = CharSet.Auto)]        private static extern IntPtr mciSendString(String lpszCommand, String lpszReturnString, int cchReturn, int hwndCallback);                [DllImport("winmm.dll", EntryPoint = "mciGetErrorString", SetLastError = true, CharSet = CharSet.Auto)]        private static extern bool mciGetErrorString(int fdwError,ref String lpszErrorText, int UINT);        private static String fileName;        public static void LoadFile(string filePath)        {            isPlaying = false;            fileName = filePath;        }        public static void Play()        {            PlaySound.mciSendString(String.Format("open {0} alias mysong", fileName), "", 0, 0);            PlaySound.mciSendString("play mysong repeat", "", 0, 0);            isPlaying = true;        }        public static bool isPlaying = false;        public static void Stop()        {            PlaySound.mciSendString("stop mysong", "", 0, 0);            isPlaying = false;        }        public static void Pause()        {            isPlaying = false;            PlaySound.mciSendString("pause mysong", "", 0, 0);        }        public static string GetErrMsg()        {            string s=string.Empty;            mciGetErrorString(1, ref s, 0);            return s;        }    }

调用如下:

class Program    {        [STAThread]        static void Main(string[] args)        {            PlaySound.LoadFile("等一分钟.mp3");            PlaySound.Play();                        while (true) ;        }    }

如何在一个应用程序中,创建多个线程,每个线程都同时播放:

    class Program    {        [STAThread]        static void Main(string[] args)        {            for (int i = 0; i < 3; i++)            {                Thread th = new Thread(new ThreadStart(PlaySong));                th.SetApartmentState(ApartmentState.STA);                th.Start();                Thread.Sleep(1000 * 5);            }            while (true) ;        }        static void PlaySong()        {            PlaySound pl = new PlaySound();            pl.LoadFile("等一分钟.mp3");            pl.Play();            while (true) ;        }    }    public class PlaySound    {        public bool isPlaying = false;        /// <summary>        /// 调用系统API        /// </summary>        /// <param name="lpszCommand"></param>        /// <param name="lpszReturnString"></param>        /// <param name="cchReturn"></param>        /// <param name="hwndCallback"></param>        /// <returns></returns>        [DllImport("winmm.dll", EntryPoint = "mciSendString", SetLastError = true, CharSet = CharSet.Auto)]        private static extern IntPtr mciSendString(String lpszCommand, String lpszReturnString, int cchReturn, int hwndCallback);        [DllImport("winmm.dll", EntryPoint = "mciGetErrorString", SetLastError = true, CharSet = CharSet.Auto)]        private static extern bool mciGetErrorString(int fdwError, ref String lpszErrorText, int UINT);        private String fileName;        public void LoadFile(string filePath)        {            isPlaying = false;            fileName = filePath;        }        public void Play()        {            mciSendString(String.Format("open {0} alias mysong", fileName), "", 0, 0);            mciSendString("play mysong repeat", "", 0, 0);            isPlaying = true;        }        public void Stop()        {            mciSendString("stop mysong", "", 0, 0);            isPlaying = false;        }        public void Pause()        {            isPlaying = false;            mciSendString("pause mysong", "", 0, 0);        }        public string GetErrMsg()        {            string s = string.Empty;            mciGetErrorString(1, ref s, 0);            return s;        }    }

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