c# 用mcisendstring 播放mp3等文件的类

主要用API 函数mcisendstring ,功能基本完整.

using System;   
using System.Collections.Generic;   
using System.Text;   
using System.Runtime.InteropServices;   
using System.IO;   
namespace WindowsApplication2   
{   
    class Media   
    {   
        [DllImport("winmm.dll", EntryPoint = "mciSendString", CharSet = CharSet.Auto)]   
         private static extern int mciSendString(   
            string lpstrCommand,   
            string lpstrReturnString,   
            int uReturnLength,   
            int hwndCallback   
            );   
  
         [DllImport("winmm.dll", EntryPoint = "mciGetDeviceID", CharSet = CharSet.Auto)]   
         private static extern int mciGetDeviceID(string lpstrName);   
         [DllImport("kernel32.dll", CharSet = CharSet.Auto)]   
         public static extern int GetShortPathName(   
         string lpszLongPath,   
         string shortFile,   
         int cchBuffer   
        );   
  
        public enum PlayTypeName : byte  
        {   
            File = 1,   
            CDAudio = 2,   
            VCD = 3,   
            RealPlay = 4   
        }   
  
        public enum AudioSource : byte  
        {   
            H = 0,   
            L = 1,   
            R = 2   
        }   
  
        public enum Playstate : byte  
        {   
            Stopped = 1,   
            Playing = 2,   
            Pause = 3   
        }   
  
        public enum PlayStyle : byte  
        {   
            顺序 = 1,   
            随机 = 2,   
            循环 = 3   
        }   
  
        public PlayTypeName PlayType;   
  
        public int Temp; //零时变量 工程中将使用   
  
         public String SongName;  //储存当前真正播放的歌曲名称   
  
         public string PreSongName;   
  
        public string NextSongName;   
  
        public int SongIndex; //储存当前播放的歌曲列表的位置   
  
         public int totalSong;   
  
        public PlayStyle PlayerStyle;//播放模式   
  
         public int Valume;//音量大小   
  
         public AudioSource audiosource;   
  
        public bool IsSlowly;//播放速度          
  
         /// <summary>   
        /// 获取DeviceID   
        /// </summary>   
        /// <returns>返回设备类型</returns>   
  
        public int GetDeviceID()   
        {   
            return mciGetDeviceID("NOWMUSIC");   
        }   
  
        /// <summary>   
        /// 根据文件名，确定设备   
         /// </summary>   
        /// <param name="ff">文件名</param>   
        /// <returns></returns>   
  
        public string GetDriverID(string ff)   
        {   
            string result = "";   
            ff = ff.ToUpper().Trim();   
            switch (ff.Substring(ff.Length - 3))   
            {   
                case "MID":   
                    result = "Sequencer";   
                    break;   
  
                case "RMI":   
                    result = "Sequencer";   
                    break;   
  
                case "IDI":   
                    result = "Sequencer";   
                    break;   
  
                case "WAV":   
                    result = "Waveaudio";   
                    break;   
  
                case "ASX":   
                    result = "MPEGVideo2";   
                    break;   
  
                case "IVF":   
                    result = "MPEGVideo2";   
                    break;   
  
                case "LSF":   
                    result = "MPEGVideo2";   
                    break;   
  
                case "LSX":   
                    result = "MPEGVideo2";   
                    break;   
  
                case "P2V":   
                    result = "MPEGVideo2";   
                    break;   
  
                case "WAX":   
                    result = "MPEGVideo2";   
                    break;   
  
                case "WVX":   
                    result = "MPEGVideo2";   
                    break;   
  
                case ".WM":   
                    result = "MPEGVideo2";   
                    break;   
  
                case "WMX":   
                    result = "MPEGVideo2";   
                    break;   
  
                case "WMP":   
                    result = "MPEGVideo2";   
                    break;   
  
                case ".RM":   
                    result = "RealPlay";   
                    break;   
  
                case "RAM":   
                    result = "RealPlay";   
                    break;   
  
                case ".RA":   
                    result = "RealPlay";   
                    break;   
  
                case "MVB":   
                    result = "RealPlay";   
                    break;   
  
                default:   
                    result = "MPEGVideo";   
                    break;   
            }   
            return result;   
        }   
  
        /// <summary>   
        /// 打开MCI设备，   
         /// </summary>   
        /// <param name="FileName">要打开的文件名</param>   
        /// <param name="Handle">mci设备的窗口句柄</param>   
        /// <returns>传值代表成功与否</returns>   
  
        public bool OpenMusic(string FileName, IntPtr Handle)   
        {   
            bool result = false;               
            string MciCommand;               
            int RefInt;   
  
            CloseMusic();   
  
            ShortPathName = "";   
            ShortPathName = ShortPathName.PadLeft(260, Convert.ToChar(" "));   
            RefInt=GetShortPathName(FileName, ShortPathName, ShortPathName .Length );   
            ShortPathName = GetCurrPath(ShortPathName);   
            string DriverID = GetDriverID(ShortPathName);   
            if (DriverID == "RealPlay")   
                return false;               
  
            MciCommand = string.Format("open {0} type {1} alias NOWMUSIC ", ShortPathName, DriverID);//"open " & RefShortName & " type " & DriverID & " alias NOWMUSIC"   
  
            if (DriverID == "AVIVideo" || DriverID == "MPEGVideo" || DriverID == "MPEGVideo2")   
            {   
                if (Handle != IntPtr.Zero)   
                {   
                    MciCommand = MciCommand + string.Format(" parent {0} style child ", Handle);// " parent " & Hwnd & " style child"   
                }   
                else  
                {   
                    MciCommand = MciCommand + " style overlapped ";   
                }   
            }   
  
            TemStr  = "";   
            TemStr  = TemStr.PadLeft(128, Convert.ToChar(" "));   
            RefInt = mciSendString(MciCommand, null, 0, 0);   
            mciSendString("set NOWMUSIC time format milliseconds", null, 0, 0);   
  
            if (RefInt == 0)   
            {   
                result = true;   
                SongName = Path.GetFileNameWithoutExtension(FileName);   
            }   
            return result;   
        }     

3 个解决方案

#1

        /// <summary>   
        /// 播放音乐   
         /// </summary>   
        /// <returns></returns>   
        public bool PlayMusic()   
        {   
            bool result = false;   
            int RefInt = mciSendString("play NOWMUSIC", null, 0, 0);   
            if (RefInt == 0)   
            {   
                result = true;   
                SetValume(Valume);//当前音量大小   
                   //检测播放速度   
                   if (IsSlowly)   
                    SetSpeed(800);   
                else  
                    SetSpeed(1200);   
                //检测声道   
                   switch ((int)audiosource)   
                {   
                    case 0:   
                        SetAudioSource(AudioSource.H);   
                        break;   
  
                    case 1:   
                        SetAudioSource(AudioSource.L);   
                        break;   
  
                    case 2:   
                        SetAudioSource(AudioSource.R);   
                        break;   
                }   
            }   
            return result;   
        }   
  
        /// <summary>   
        /// 设置声音大小   
         /// </summary>   
        /// <param name="Valume">音量大小</param>   
        /// <returns></returns>   
        public bool SetValume(int Valume)   
        {   
            bool result = false;   
            string MciCommand = string.Format("setaudio NOWMUSIC volume to {0}", Valume);   
            int RefInt = mciSendString(MciCommand, null, 0, 0);   
            if (RefInt == 0)   
            {   
                result = true;   
            }   
  
            return result;   
        }   
  
        /// <summary>   
        /// 设置播放速度   
         /// </summary>   
        /// <param name="Speed"></param>   
        /// <returns></returns>   
        public bool SetSpeed(int Speed)   
        {   
  
            bool result = false;   
            string MciCommand = string.Format("set NOWMUSIC speed to {0}", Speed);   
            int RefInt = mciSendString(MciCommand, null, 0, 0);   
            if (RefInt == 0)   
                result = true;   
            return result;   
        }   
  
        /// <summary>   
        /// 设置声道   
         /// </summary>   
        /// <param name="audioSource"></param>   
        /// <returns></returns>   
  
        public bool SetAudioSource(AudioSource audioSource)   
        {   
            bool result = false;   
            string strSource = "";   
            switch ((int)audioSource)   
            {   
                case 1: strSource = "left"; break;   
  
                case 2: strSource = "right"; break;   
  
                case 0: strSource = "stereo"; break;   
            }   
  
            int RefInt = mciSendString("setaudio  NOWMUSIC source to " + strSource, null, 0, 0);   
            if (RefInt == 0)   
                result = true;   
            return result;   
        }   
  
        /// <summary>   
        /// 设置静音 True为静音，FALSE为取消静音   
         /// </summary>   
        /// <param name="AudioOff"></param>   
        /// <returns></returns>   
        public bool SetAudioOnOff(bool AudioOff)   
        {     
            bool resut = false;  
            string OnOff;    
            if (AudioOff)     
                OnOff = "off";  
            else    
                OnOff = "on";  
            int RefInt = mciSendString("setaudio NOWMUSIC " + OnOff, null, 0, 0);    
            if (RefInt == 0)   
                resut = true;    
            return resut;   
        }   
  
        /// <summary>     
        /// 关闭媒体     
         /// </summary>     
        /// <returns></returns>    
        public bool CloseMusic()    
        {     
            int RefInt = mciSendString("close NOWMUSIC", null, 0, 0);   
            if (RefInt == 0)     
                return true;     
            return false;    
        }   
  
        /// <summary>     
        /// 暂停播放     
         /// </summary>     
        /// <returns></returns>   
        public bool PauseMusic()     
        {     
            int RefInt = mciSendString("pause NOWMUSIC", null, 0, 0);   
            if (RefInt == 0)     
                return true;     
            return false;    
        }   
  
        /// <summary>     
        /// 获得当前媒体的状态是不是在播放    
         /// </summary>     
        /// <returns></returns>     
        public Playstate IsPlaying()    
        {     
            Playstate isPlaying=Playstate .Stopped ;   
            durLength = "";     
            durLength = durLength.PadLeft(128, Convert.ToChar(" "));    
            int RefInt=  mciSendString("status NOWMUSIC mode", durLength, durLength.Length, 0);   
            durLength = durLength.Trim();   
  
            if (durLength.Substring(0, 7) == "playing" || durLength.Substring(0, 2) == "播放")  
                isPlaying = Playstate.Playing;     
            else if (durLength.Substring(0, 7) == "stopped" || durLength.Substring(0, 2) == "停止")   
                isPlaying = Playstate.Stopped;     
            else isPlaying = Playstate.Pause;   
            return isPlaying;   
        }   
  
        /// <summary>     
        /// 获取当前播放进度 毫秒     
         /// </summary>     
        /// <returns></returns>    
        public int GetMusicPos()     
        {     
            durLength = "";     
            durLength = durLength.PadLeft(128, Convert.ToChar(" "));     
            mciSendString("status NOWMUSIC position", durLength ,durLength .Length , 0);   
            durLength = durLength.Trim();    
            if (string.IsNullOrEmpty(durLength)) 
                return 0;     
            else    
                return (int)(Convert.ToDouble(durLength) );     
        }   
  
        /// <summary>     
        /// 获取当前播放进度 格式 00：00:00   
        /// </summary>     
        /// <returns></returns>     
        public string GetMusicPosString()     
        {     
            durLength = "";     
            durLength = durLength.PadLeft(128, Convert.ToChar(" "));   
            mciSendString("status NOWMUSIC position", durLength, durLength.Length, 0);   
            durLength = durLength.Trim();   
  
            if (string.IsNullOrEmpty(durLength))   
                return "00:00:00";     
            else    
            {     
                int s = Convert.ToInt32(durLength)/1000;   
                int h = s /3600;     
                int m = (s - (h * 3600)) / 60;     
                s = s - (h * 3600 + m * 60);     
                return string.Format("{0:D2}:{1:D2}:{2:D2}", h, m, s);     
            }     
        }     

#2

        /// <summary>     
        /// 获取媒体的长度     
         /// </summary>     
        /// <returns></returns>     
        public int GetMusicLength()     
        {     
            durLength = "";     
            durLength = durLength.PadLeft(128, Convert.ToChar(" "));     
            mciSendString("status NOWMUSIC length", durLength, durLength.Length, 0);   
            durLength = durLength.Trim();   
  
            if (string.IsNullOrEmpty(durLength))   
                return 0;     
            else    
                return Convert.ToInt32(durLength);     
        }   
  
        /// <summary>     
        /// 获取媒体的长度 00:00:00     
        /// </summary>     
        /// <returns></returns>     
        public string GetMusicLengthString()     
        {     
            durLength = "";     
            durLength = durLength.PadLeft(128, Convert.ToChar(" "));    
            mciSendString("status NOWMUSIC length", durLength, durLength.Length, 0);   
            durLength = durLength.Trim();     
            if (string.IsNullOrEmpty(durLength))   
                return "00:00:00";   
  
            else    
            {     
                int s = Convert.ToInt32(durLength) / 1000;     
                int h = s / 3600;     
                int m = (s - (h * 3600)) / 60;     
                s = s - (h * 3600 + m * 60);     
                return string.Format("{0:D2}:{1:D2}:{2:D2}", h, m, s);   
            }     
        }    
  
        public bool SetMusicPos(int Position)     
        {     
            string MciCommand = string.Format("seek NOWMUSIC to {0}", Position ); 
            int RefInt = mciSendString( MciCommand , null, 0, 0);   
            if (RefInt == 0)     
                return true;     
            else    
                return false;     
        }   
  
        private string GetCurrPath(string name)    
        {     
            if (name.Length < 1) return "";     
            name = name.Trim();     
            name = name.Substring(0, name.Length - 1); 
            return name;     
        }       
  
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]     
        private string ShortPathName = "";     

        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]     
        private string durLength = "";   
  
        [MarshalAs(UnmanagedType.LPTStr, SizeConst = 128)]    
        private string TemStr = "";     
    }     
}  

#3

学习了，呵呵