如何使用 winmm.dll 确定歌曲的长度？

发布于 2024-07-25 04:55:54 字数 623 浏览 5 评论 0原文

我已经P/Invoked the mciSendString method from WinMM.dll：

[DllImport("winmm.dll")]
private static extern long mciSendString(string strCommand, StringBuilder strReturn,
                                         int iReturnLength, IntPtr hwndCallback);

我可以播放、暂停和停止歌曲（我还可以打开/关闭 CD 驱动器，但这并不重要）。现在我希望我的用户能够跳到歌曲中的某个部分（例如 1:21）。我查看了 seek 函数文档除了我不知道一首歌有多长之外，它看起来很简单。 WinMM 中是否存在执行此操作的命令/方法？

原文

I've P/Invoked the mciSendString method from WinMM.dll:

[DllImport("winmm.dll")]
private static extern long mciSendString(string strCommand, StringBuilder strReturn,
                                         int iReturnLength, IntPtr hwndCallback);

I can play, pause, and stop songs (I can also open/close the CD drive, but that's not important). Now I want my user to be able to skip to a certain part in a song (e.g. 1:21). I've looked at the seek functions documentation and it seems pretty staightforward except that I can't figure out how long a song is. Does a command/method exist to do this in WinMM?

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丘比特射中我 2024-08-01 04:55:54

大概是这样的：

StringBuilder sb = new StringBuilder(128);
mciSendString("status mediafile length", sb, 128, IntPtr.Zero);
long songlength = Convert.ToUInt64(sb.ToString());

It would probably be something like this:

StringBuilder sb = new StringBuilder(128);
mciSendString("status mediafile length", sb, 128, IntPtr.Zero);
long songlength = Convert.ToUInt64(sb.ToString());

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