no sound heard while playing a MIDI file in C#.Net

Question

I use this code to play a MIDI file for my game, but I can not hear any sound from my speakers. Would you help me? It\'s kind of an emergency, please... My speakers are turn

Answer 1

I used to use the definition...

[DllImport("winmm.dll", EntryPoint = "mciSendStringA")] 

public static extern void mciSendStringA(string lpstrCommand, string lpstrReturnString, long uReturnLength, long hwndCallback); 

...in .Net 3.5 but in .Net 4.0 is gave me and unbalanced pinvoke exception! I fixed it by using this instead...

[DllImport("winmm.dll", EntryPoint = "mciSendStringA")]

public static extern void mciSendStringA(string lpstrCommand, string lpstrReturnString, int uReturnLength, IntPtr hwndCallback); 

...and passing in IntPtr.Zero as the last param.

The only difference is the uReturnLength is an int (and not a long) and hwndCallback is a IntPtr (and not a long).

Hope this helps...