C#获取音频文件(MP3等)播放时间长度的几种方式

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先介绍3种，分别是API方式，读取文件信息方式，使用DirectX中的AudioVideoPlayback方式。

1.API方式

通过winmm.dll中mciSendString多媒体API函数来获得音频文件信息。

主要代码：

using (OpenFileDialog openFileDialog = new OpenFileDialog()){openFileDialog.Filter = "MP3文件(*.mp3)|*.mp3";if (openFileDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK){string fileName = openFileDialog.FileName;TemStr = "";MP3Name = "";TemStr = TemStr.PadLeft(127, Convert.ToChar(" "));MP3Name = MP3Name.PadLeft(260, Convert.ToChar(" "));ilong = APIClass.GetShortPathName(fileName, MP3Name, MP3Name.Length);MP3Name = GetCurrPath(MP3Name);MP3Name = "Open \"" + MP3Name + "\" type mpegvideo alias mysong";ilong = APIClass.mciSendString(MP3Name, "", 0, 0);durLength = "";durLength = durLength.PadLeft(128, Convert.ToChar(" "));ilong = APIClass.mciSendString("set mysong time format milliseconds", TemStr, TemStr.Length, 0);ilong = APIClass.mciSendString("status mysong length", durLength, durLength.Length, 0);durLength = durLength.Trim();if (durLength == ""){btn.Content = 0;}else{int s_sum = (int)(Convert.ToInt32(durLength) / 1000);int h = (int)(s_sum / 3600);int m = (int)(s_sum / 60) - h * 60;int s = (int)s_sum % 60;btn.Content = string.Format("{0}:{1:d2}:{2:d2}", h, m, s);}}}

2.读取文件信息方式

需要引用COM组件的Microsoft Shell Controls And Automation

主要代码：

using (OpenFileDialog openFileDialog = new OpenFileDialog()){if (openFileDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK){string strFileName = openFileDialog.FileName;string dirName = System.IO.Path.GetDirectoryName(strFileName);string SongName = System.IO.Path.GetFileName(strFileName);//获得歌曲名称FileInfo fInfo = new FileInfo(strFileName);ShellClass sh = new ShellClass();Folder dir = sh.NameSpace(dirName);FolderItem item = dir.ParseName(SongName);btn.Content = Regex.Match(dir.GetDetailsOf(item, -1), "\\d:\\d{2}:\\d{2}").Value;//获取歌曲时间}}

3.使用DirectX中的AudioVideoPlayback方式

引用Microsoft.DirectX.AudioVideoPlayback;

注意：64位系统需将项目生成为x86应用程序。

如为.NET4.0平台调试，将app.config修改为：

<?xml version="1.0" encoding="utf-8"?><configuration>  <startup>    <!--<supportedRuntime version="v2.0.50727"/>-->    <startup useLegacyV2RuntimeActivationPolicy="true">      <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>    </startup>  </startup></configuration>

另外：调试中DirectX报错，如需过滤，将菜单调试->异常->Managed Debugging Assistants中勾去掉即可。

主要代码：

using (OpenFileDialog openFileDialog = new OpenFileDialog()){if (openFileDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK){string strFileName = openFileDialog.FileName;Audio ourAudio1 = new Audio(strFileName);int h = (int)(ourAudio1.Duration / 3600);int m = (int)(ourAudio1.Duration / 60) - h * 60;int s = (int)ourAudio1.Duration % 60;btn.Content = string.Format("{0}:{1:d2}:{2:d2}", h, m, s);//ourAudio1.Play();}}

代码

作者：FoolRabbit
出处：http://blog.csdn.net/rabbitsoft_1987
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