C#获取音频文件(MP3等)播放时间长度的几种方式

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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