MCI

I am attempting to use MCISendString in order to aquire information about a media file.  More specifically I want to get the file length(in time) of a wma file.  I found elsewhere some information that is supposed to accomplish this, but I cannot get it to work.  Below is my code.

Using the code below, the return values of the calls to mciSendString were 0, meaning no errors, but no matter what my command string is, I mssg is ALWAYS blank.  Does anyone see anything that would be keeping mssg from returning a value????????

Thanks,
Kendal

private void FindLength(string file)
		{
			string cmd = "open " + file + " alias voice1";
			StringBuilder mssg = new StringBuilder(255);
			int h = mciSendString(cmd,null,0,0);
			int i = mciSendString("set voice1 time format ms", null, 0, 0);
			int j = mciSendString("status voice1 length", mssg, mssg.Length, 0);
			MessageBox.Show(mssg.ToString());
 
		}
 
		[DllImport("winmm.dll")]
		public static extern int mciSendString(string lpstrCommand, StringBuilder lpstrReturnString, int uReturnLength, int hwndCallback);
 
		[DllImport ("winmm.dll")] 
		private static extern int mciGetErrorString(int l1, StringBuilder s1, int l2);

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