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 程式師世界 >> 編程語言 >> .NET網頁編程 >> C# >> C#入門知識 >> C#中用API實現MP3等音頻文件的播放類

C#中用API實現MP3等音頻文件的播放類

編輯:C#入門知識

C#沒有提供播放MP3等音頻文件的類,要編寫播放MP3等音頻文件程序,必須使用第三方控件或類。本文使用API函數mciSendString,編寫一個播放MP3等音頻文件的類。

  具體源碼如下:

  一、使用API函數mciSendString構成的媒體播放類。

using System;
using System.Runtime.InteropServices;
using System.Text;
using System.IO ;
namespace clsMCIPlay
{
 /// <summary>
 /// clsMci 的摘要說明。
 /// </summary>
 public class clsMCI
 {
  public clsMCI()
  {
   //
   // TODO: 在此處添加構造函數邏輯
   //
  }

  //定義API函數使用的字符串變量
  [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;
  //定義播放狀態枚舉變量
  public enum State
  {
   mPlaying = 1,
   mPuase = 2,
   mStop = 3
  };
  //結構變量
  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() ;

  //取得播放文件屬性
  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("出錯錯誤!");
    }
   }
  }
  //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;
  }
  //總時間
  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);
   }
  }

  //當前時間
  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
  );
 }
}


  二、用於測試媒體播放類的簡單代碼:

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 的摘要說明。
 /// </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 窗體設計器支持所必需的
   //
   InitializeComponent();

   //
   // TODO: 在 InitializeComponent 調用後添加任何構造函數代碼
   //
  }

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

  #region Windows 窗體設計器生成的代碼
  /// <summary>
  /// 設計器支持所需的方法 - 不要使用代碼編輯器修改
  /// 此方法的內容。
  /// </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);

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