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 C#中用API实现MP3等音频文件的播放类


  C#没有提供播放MP3等音频文件的类,要编写播放MP3等音频文件程序,必须使用第三方控件或类。本文使用API函数mciSendString,编写一个播放MP3等音频文件的类。

  具体源码如下:

  一、使用API函数mciSendString构成的媒体播放类。

using System;
using System.Runtime.InteropServices; 
using System.Text; 
using System.IO ; 
namespace clsMCIPlay
{
 /// <summary>
 /// clsMci 的摘要说明。
 /// </summary>
 public class clsMCI
 {
  public clsMCI()
  {
   //
   // TODO: 在此处添加构造函数逻辑
   //
  }

  //定义API函数使用的字符串变量 
  [MarshalAs(UnmanagedType.ByValTStr,SizeConst=260)]
  private string Name = "" ;
  [MarshalAs(UnmanagedType.ByValTStr,SizeConst=128)]
  private string durLength = "" ;
  [MarshalAs(UnmanagedType.LPTStr,SizeConst=128)]
  private string TemStr ="";
  int ilong;
  //定义播放状态枚举变量
  public enum State
  {
   mPlaying = 1,
   mPuase = 2,
   mStop = 3
  };
  //结构变量
  public struct structMCI 
  {
   public bool bMut;
   public int iDur;
   public int iPos;
   public int iVol;
   public int iBal;
   public string iName;
   public State state;
  };

  public structMCI mc =new structMCI() ;

  //取得播放文件属性
  public string FileName
  {
   get
   {
    return mc.iName;
   }
   set
   {
    //ASCIIEncoding asc = new ASCIIEncoding(); 
    try
    {
     TemStr =""; 
     TemStr = TemStr.PadLeft(127,Convert.ToChar(" "));
     Name = Name.PadLeft(260,Convert.ToChar(" ")) ;
     mc.iName = value; 
     ilong = APIClass.GetShortPathName(mc.iName,Name, Name.Length);
     Name = GetCurrPath(Name);
     //Name = "open " + Convert.ToChar(34) + Name + Convert.ToChar(34) + " alias media";
     Name = "open " + Convert.ToChar(34) + Name + Convert.ToChar(34) + " alias media";
     ilong = APIClass.mciSendString("close all", TemStr, TemStr.Length , 0);
     ilong = APIClass.mciSendString( Name, TemStr, TemStr.Length, 0);
     ilong = APIClass.mciSendString("set media time format milliseconds", TemStr, TemStr.Length , 0);
     mc.state = State.mStop; 
    }
    catch
    {
     MessageBox.Show("出错错误!"); 
    }
   }
  }
  //播放
  public void play()
  {
   TemStr = "";
   TemStr = TemStr.PadLeft(127,Convert.ToChar(" "));
   APIClass.mciSendString("play media", TemStr, TemStr.Length , 0);
   mc.state = State.mPlaying ;
  }
  //停止
  public void StopT()
  {
   TemStr = "";
   TemStr = TemStr.PadLeft(128,Convert.ToChar(" "));
   ilong = APIClass.mciSendString("close media", TemStr, 128, 0);
   ilong = APIClass.mciSendString("close all", TemStr, 128, 0);
   mc.state = State.mStop ; 
  }

  public void Puase()
  {
   TemStr = "";
   TemStr = TemStr.PadLeft(128,Convert.ToChar(" "));
   ilong = APIClass.mciSendString("pause media", TemStr, TemStr.Length, 0);
   mc.state = State.mPuase ; 
  }
  private string GetCurrPath(string name)
  {
   if(name.Length <1) return ""; 
   name = name.Trim();
   name = name.Substring(0,name.Length-1);
   return name;
  }
  //总时间
  public int Duration
  {
   get
   {
    durLength = "";
    durLength = durLength.PadLeft(128,Convert.ToChar(" ")) ;
    APIClass.mciSendString("status media length", durLength, durLength.Length, 0);
    durLength = durLength.Trim();
    if(durLength == "") return 0;
    return (int)(Convert.ToDouble(durLength) / 1000f); 
   }
  }

  //当前时间
  public int CurrentPosition
  {
   get
   {
    durLength = "";
    durLength = durLength.PadLeft(128,Convert.ToChar(" ")) ;
    APIClass.mciSendString("status media position", durLength, durLength.Length, 0);
    mc.iPos = (int)(Convert.ToDouble(durLength) / 1000f);
    return mc.iPos;
   }
  }
 }

 public class APIClass
 {
  [DllImport("kernel32.dll", CharSet = CharSet.Auto)]
  public static extern int GetShortPathName (
   string lpszLongPath,
   string shortFile,
   int cchBuffer
  );

  [DllImport("winmm.dll", EntryPoint="mciSendString", CharSet = CharSet.Auto)]
  public static extern int mciSendString (
   string lpstrCommand,
   string lpstrReturnString,
   int uReturnLength,
   int hwndCallback
  );
 }
}

2
  二、用于测试媒体播放类的简单代码:

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Runtime.InteropServices; 
using System.Text; 
using System.IO ;
using clsMCIPlay;

namespace MCIPlay
{
 /// <summary>
 /// Form1 的摘要说明。
 /// </summary>
 public class Form1 : System.Windows.Forms.Form
 {
  private System.ComponentModel.IContainer components;
  private System.Windows.Forms.Timer timer1;
  private System.Windows.Forms.Button Play;
  private System.Windows.Forms.Button Stop;
  private System.Windows.Forms.Button Puase;
  private System.Windows.Forms.Label PlayFileName;
  private System.Windows.Forms.Label Duration;
  private System.Windows.Forms.Label CurrentPosition;
  private System.Windows.Forms.OpenFileDialog openFileDialog1;
  private System.Windows.Forms.Button BrowserFile;
  clsMCI mp = new clsMCI(); 

  public Form1()
  {
   //
   // Windows 窗体设计器支持所必需的
   //
   InitializeComponent();

   //
   // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
   //
  }

  /// <summary>
  /// 清理所有正在使用的资源。
  /// </summary>
  protected override void Dispose( bool disposing )
  {
   if( disposing )
   {
    if (components != null) 
    {
     components.Dispose();
    }
   }
   base.Dispose( disposing );
  }

  #region Windows 窗体设计器生成的代码 
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
   this.components = new System.ComponentModel.Container();
   this.Play = new System.Windows.Forms.Button();
   this.PlayFileName = new System.Windows.Forms.Label();
   this.Duration = new System.Windows.Forms.Label();
   this.Stop = new System.Windows.Forms.Button();
   this.Puase = new System.Windows.Forms.Button();
   this.CurrentPosition = new System.Windows.Forms.Label();
   this.timer1 = new System.Windows.Forms.Timer(this.components);
   this.openFileDialog1 = new System.Windows.Forms.OpenFileDialog();
   this.BrowserFile = new System.Windows.Forms.Button();
   this.SuspendLayout();
   // 
   // Play
   // 
   this.Play.Location = new System.Drawing.Point(102, 243);
   this.Play.Name = "Play";
   this.Play.Size = new System.Drawing.Size(78, 24);
   this.Play.TabIndex = 0;
   this.Play.Text = "Play";
   this.Play.Click += new System.EventHandler(this.Play_Click);
   // 
   // PlayFileName
   // 
   this.PlayFileName.AutoSize = true;
   this.PlayFileName.Location = new System.Drawing.Point(12, 15);
   this.PlayFileName.Name = "PlayFileName";
   this.PlayFileName.Size = new System.Drawing.Size(0, 17);
   this.PlayFileName.TabIndex = 1;
   // 
   // Duration
   // 
   this.Duration.AutoSize = true;
   this.Duration.Location = new System.Drawing.Point(15, 51);
   this.Duration.Name = "Duration";
   this.Duration.Size = new System.Drawing.Size(0, 17);
   this.Duration.TabIndex = 2;
   // 
   // Stop
   // 
   this.Stop.Location = new System.Drawing.Point(282, 243);
   this.Stop.Name = "Stop";
   this.Stop.Size = new System.Drawing.Size(81, 24);
   this.Stop.TabIndex = 3;
   this.Stop.Text = "Stop";
   this.Stop.Click += new System.EventHandler(this.Stop_Click);
   // 
   // Puase
   // 
   this.Puase.Location = new System.Drawing.Point(198, 243);
   this.Puase.Name = "Puase";
   this.Puase.Size = new System.Drawing.Size(72, 24);
   this.Puase.TabIndex = 4;
   this.Puase.Text = "Puase";
   this.Puase.Click += new System.EventHandler(this.Puase_Click);
   // 
   // CurrentPosition
   // 
   this.CurrentPosition.AutoSize = true;
   this.CurrentPosition.Location = new System.Drawing.Point(15, 87);
   this.CurrentPosition.Name = "CurrentPosition";
   this.CurrentPosition.Size = new System.Drawing.Size(0, 17);
   this.CurrentPosition.TabIndex = 5;
   // 
   // timer1
   // 
   this.timer1.Enabled = true;
   this.timer1.Interval = 1000;
   this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
   // 
   // BrowserFile
   // 
   this.BrowserFile.Location = new System.Drawing.Point(312, 165);
   this.BrowserFile.Name = "BrowserFile";
   this.BrowserFile.Size = new System.Drawing.Size(87, 24);
   this.BrowserFile.TabIndex = 6;
   this.BrowserFile.Text = "SelectFile";
   this.BrowserFile.Click += new System.EventHandler(this.BrowserFile_Click);
   // 
   // Form1
   // 
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(433, 287);
   this.Controls.Add(this.BrowserFile);
   this.Controls.Add(this.CurrentPosition);
   this.Controls.Add(this.Puase);
   this.Controls.Add(this.Stop);
   this.Controls.Add(this.Duration);
   this.Controls.Add(this.PlayFileName);
   this.Controls.Add(this.Play);
   this.Name = "Form1";
   this.Text = "Form1";
   this.ResumeLayout(false);

  }
  #endregion

  /// <summary>
  /// 应用程序的主入口点。 
  /// </summary>
  [STAThread]
  static void Main() 
  {
   Application.Run(new Form1());
  }

  //选择MP3文件播放
  private void Play_Click(object sender, System.EventArgs e)
  {
   try
   {
    mp.play(); 
   }
   catch
   {
    MessageBox.Show("出错错误!"); 
   }
  }

  //暂停播放
  private void Puase_Click(object sender, System.EventArgs e)
  {
   try
   {
    mp.Puase(); 
   }
   catch
   {
    MessageBox.Show("出错错误!"); 
   }

  }

  //停止播放
  private void Stop_Click(object sender, System.EventArgs e)
  {
   try
   {
    mp.StopT(); 
   }
   catch
   {
    MessageBox.Show("出错错误!"); 
   }
  }

  //每秒显示一次播放进度
  private void timer1_Tick(object sender, System.EventArgs e)
  {
   CurrentPosition.Text = mp.CurrentPosition.ToString(); 
  }

  //浏览文件
  private void BrowserFile_Click(object sender, System.EventArgs e)
  {
   try
   {
    openFileDialog1.Filter = "*.mp3|*.mp3";
    openFileDialog1.FileName = "";
    if(openFileDialog1.ShowDialog() == DialogResult.OK)
    {
     mp.FileName = openFileDialog1.FileName ;
     PlayFileName.Text = openFileDialog1.FileName ;
     Duration.Text = mp.Duration.ToString() ; 
    }
   }
   catch
   {
    MessageBox.Show("出错错误!"); 
   }
  }
 }
}

  本程序在.net 2003 、win XP SP1下编译通过。

该文章在 2018-1-12 23:05:58 编辑过

  离 线  2018-1-12 23:05:57 
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