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mciSendString 为嘛有的能取音频文件长度有的却不能

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悬赏园豆：200 [已解决问题] 解决于 2023-03-02 13:52

mciSendString 为嘛有的能取音频文件长度有的却不能

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using System.Runtime.InteropServices;
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;

public class ClassMp3
{
    [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
    );

    #region 基本无用
    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);

        string CmdStr   =   "play   f:/mp3/让我取暖.mp3   fullscreen";
        mciSendString(CmdStr, null, 0, 0);

        if (RefInt == 0)
        {
            result = true;
            SongName = Path.GetFileNameWithoutExtension(FileName);
        }
        return result;
    }


    ///<summary>
    /// 关闭音乐
    ///</summary>
    ///<returns></returns>
    public bool CloseMusic()
    {
        string CmdStr = "stop f:/mp3/让我取暖.mp3 fullscreen";
        int RefInt = mciSendString(CmdStr, null, 0, 0);

        string CmdStr2 = "close f:/mp3/让我取暖.mp3 fullscreen";
         RefInt = mciSendString(CmdStr2, null, 0, 0);

        if (RefInt == 0)
            return true;
        return false;
    }

    ///<summary>
    /// 播放音乐
    ///</summary>
    ///<returns></returns>
    public bool PlayMusic()
    {
        bool result = false;
        string CmdStr = "play   f:/mp3/让我取暖.mp3   fullscreen";
        int RefInt = mciSendString(CmdStr, 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>
    /// 暂停播放
    ///</summary>
    ///<returns></returns>
    public bool PauseMusic()
    {
        string CmdStr = "pause   f:/mp3/让我取暖.mp3   fullscreen";
        int RefInt = mciSendString(CmdStr, 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;
        try
        {

            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;
        }
        catch
        {
        }

        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(""));
        string CmdStr = "status   f:/mp3/让我取暖.mp3   position";
        mciSendString(CmdStr, 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(""));
        string CmdStr = "status   f:/mp3/让我取暖.mp3   position";
        mciSendString(CmdStr, 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;
    }
    #endregion


    private static bool IsHanZi(string ch)
    {
        byte[] byte_len = System.Text.Encoding.Default.GetBytes(ch);
        if (byte_len.Length == 2) { return true; }

        return false;
    }
    

    ///<summary>
    /// 获取媒体的长度
    ///</summary>
    ///<returns></returns>
    public int GetMusicLength(string FileName)
    {
        durLength = "";

        durLength = durLength.PadLeft(128, Convert.ToChar(""));

        ShortPathName = "";
        ShortPathName = ShortPathName.PadLeft(260, Convert.ToChar(""));
        int RefInt = GetShortPathName(FileName, ShortPathName, ShortPathName.Length);
        ShortPathName = GetCurrPath(ShortPathName);

        string CmdStr = string.Empty;
        if (FileName.Contains("")||!FileName.Contains("nobody"))
        {
            CmdStr = "status  " + ShortPathName + "   length";
        }
        else
        {
            CmdStr = "status  " + FileName + "   length";
        }
        
        mciSendString(CmdStr, 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(string FileName)
    {
        durLength = "";

        durLength = durLength.PadLeft(128, Convert.ToChar(""));

        ShortPathName = "";
        ShortPathName = ShortPathName.PadLeft(260, Convert.ToChar(""));
        int RefInt = GetShortPathName(FileName, ShortPathName, ShortPathName.Length);
        ShortPathName = GetCurrPath(ShortPathName);

        string CmdStr = "status  " + ShortPathName + "   length";
        mciSendString(CmdStr, durLength, durLength.Length, 0);

        durLength = durLength.Trim();

        if (string.IsNullOrEmpty(durLength))

            return "00:00:00";

        else
        {
            if (durLength!="\0")
            {
                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);
            }
            return "00:00:00";
        }
    }
    

    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]

    private string ShortPathName = "";

    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]

    private string durLength = "";

    [MarshalAs(UnmanagedType.LPTStr, SizeConst = 128)]

    private string TemStr = "";

}


 当我打印 Response.Write(cm.GetMusicLengthString("F:\\Mp3\\nobody.mp3"));

结果是 00:00:00其他文件都可以取到长度 知道的亲解答下！谢谢

单纯的遐想的主页 单纯的遐想 | 初学一级 | 园豆：21
提问于：2012-04-01 01:52
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最佳答案
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楼主看看这里能不能 帮到你http://hi.baidu.com/feitianchong1/blog/item/dadc41a6b5ae679cd04358c4.html

收获园豆：200
az235 | 大侠五级 |园豆：8483 | 2012-04-01 09:47

谢谢你的回答 不过人家最后也强调不是所有Mp3都可以读取到长度

单纯的遐想 | 园豆：21 (初学一级) | 2012-04-01 12:34

@aiouluosi: 有没有尝试一下他所说的方法？

az235 | 园豆：8483 (大侠五级) | 2012-04-01 12:36
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