mciSendString cannot save wave file

[C# Programming]

Hello,

VS 2008 SP1

I have a created a small application that records and plays audio. However, my application needs to save the wave file to the application data directory on the users computer.

The mciSendString takes a C style string as a parameter and has to be in 8.3 format. However, my problem is I can't get it to save. And what is strange is sometime it does and sometimes it doesn't. However, most of the time it failes. However, if I save directly to the C drive it works first time everything. I have used 3 different methods that I have coded below.

The error number that I get when it fails is 286."The file was not saved. Make sure your system has sufficient disk space or has an intact network connection"



[DllImport("winmm.dll",CharSet=CharSet.Auto)]
private static extern uint mciSendString([MarshalAs(UnmanagedType.LPTStr)] string command,
StringBuilder returnValue,
int returnLength,
IntPtr winHandle);

[DllImport("winmm.dll", CharSet = CharSet.Auto)]
private static extern int mciGetErrorString(uint errorCode, StringBuilder errorText, int errorTextSize);

[DllImport("Kernel32.dll", CharSet=CharSet.Auto)]
private static extern int GetShortPathName([MarshalAs(UnmanagedType.LPTStr)] string longPath,
[MarshalAs(UnmanagedType.LPTStr)] StringBuilder shortPath,
int length);

// Stop recording
private void StopRecording()
{
// Save recorded voice
string shortPath = this.shortPathName();
string formatShortPath = string.Format("save recsound \"{0}\"", shortPath);
uint result = 0;
StringBuilder errorTest = new StringBuilder(256);

// C:\DOCUME~1\Steve\APPLIC~1\Test.wav
// Fails
result = mciSendString(string.Format("{0}", formatShortPath), null, 0, IntPtr.Zero);
mciGetErrorString(result, errorTest, errorTest.Length);

// command line convention - fails
result = mciSendString("save recsound \"C:\\DOCUME~1\\Steve\\APPLIC~1\\Test.wav\"", null, 0, IntPtr.Zero);
mciGetErrorString(result, errorTest, errorTest.Length);

// 8.3 short format - fails
result = mciSendString(@"save recsound C:\DOCUME~1\Steve\APPLIC~1\Test.wav", null, 0, IntPtr.Zero);
mciGetErrorString(result, errorTest, errorTest.Length);

// Save to C drive works everytime.
result = mciSendString(@"save recsound C:\Test.wav", null, 0, IntPtr.Zero);
mciGetErrorString(result, errorTest, errorTest.Length);

mciSendString("close recsound ", null, 0, IntPtr.Zero);
}


// Get the short path name so that the mciSendString can save the recorded wave file
private string shortPathName()
{
string shortPath = string.Empty;
long length = 0;
StringBuilder buffer = new StringBuilder(256);

// Get the length of the path
length = GetShortPathName(this.saveRecordingPath, buffer, 256);

shortPath = buffer.ToString();

return shortPath;
}