C#中用API实现MP3等音频文件的播放类
作者： vbprog 出处： CSDN 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 ); }}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。 (2005-6-08:04:31)
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