使用API函数mciSendString构成的媒体播放类

使用API函数mciSendString构成的媒体播放类.txt我自横刀向天笑，笑完我就去睡觉。你的手机比话费还便宜。路漫漫其修远兮，不如我们打的吧。/**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。*/usingSystem;usingSystem.Collections.Generic;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Linq;usingSystem.Text;usingSystem.Windows.Forms;usingSystem.Runtime.InteropServices;namespace使用API函数mciSendString构成的媒体播放类{publicpartialclassForm1:Form{stringpath;publicForm1(){InitializeComponent();}clsMCImci=null;privatevoidbutton1_Click(objectsender,EventArgse){mci=newclsMCI();mci.FileName=path;gressBar1.Maximum=mci.Duration;mci.play();this.timer1.Enabled=true;}privatevoidbutton2_Click(objectsender,EventArgse){if(mci==null){}else{this.timer1.Enabled=false;mci.StopT();}}privatevoidbutton3_Click(objectsender,EventArgse){OpenFileDialogop=newOpenFileDialog();if(op.ShowDialog()==DialogResult.OK){path=op.FileName;}}privatevoidForm1_Load(objectsender,EventArgse){}privatevoidtimer1_Tick(objectsender,EventArgse){gressBar1.Value=mci.CurrentPosition;if(mci.CurrentPosition==mci.Duration){this.timer1.Enabled=false;}}}publicclassclsMCI{publicclsMCI(){////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)]privatestringName="";}///<summary>//////</summary>publicvoidPuase(){TemStr="";TemStr=TemStr.PadLeft(128,Convert.ToChar(""));ilong=APIClass.mciSendString("pausemedia",TemStr,TemStr.Length,0);mc.state=State.mPuase;}///<summary>//////</summary>///<paramname="name"></param>///<returns></returns>privatestringGetCurrPath(stringname){if(name.Length<1)return"";name=name.Trim();name=name.Substring(0,name.Length-1);returnname;}///<summary>///总时间///</summary>publicintDuration{get{durLength="";durLength=durLength.PadLeft(128,Convert.ToChar(""));APIClass.mciSendString("statusmedialength",durLength,durLength.Length,0);durLength=durLength.Trim();if(durLength=="")return0;durLength=durLength.Substring(0,durLength.IndexOf('\0'));return(int)(Convert.ToDouble(durLength)/1000f);}}///<summary>///当前时间///</summary>publicintCurrentPosition{get{durLength="";durLength=durLength.PadLeft(128,Convert.ToChar(""));APIClass.mciSendString("statusmediaposition",durLength,durLength.Length,0);durLength=durLength.Substring(0,durLength.IndexOf('\0'));mc.iPos=(int)(Convert.ToDouble(durLength)/1000f);returnmc.iPos;}}}publicclassAPIClass{[DllImport("kernel32.dll",CharSet=CharSet.Auto)]publicstaticexternintGetShortPathName(stringlpszLongPath,stringshortFile,intcchBuffer);[DllImport("winmm.dll",EntryPoint="mciSend