quick winamp control question

[wrybread]

I'm new to SDKs and had a quick question about controlling Winamp. I'm using Python, but the principles should be pretty universal.

# launch winamp with the class name Winamp_a
a = win32api.WinExec('c:/program files/winamp/winamp.exe /CLASS="Winamp_a"')

# make the handle (returns for example "65640")
hWinamp = win32gui.FindWindow(a, None)

# execute a command (numbers taken from the file wa_ipc.h in the Winamp SDK)
# format is SendMessage(hwnd_winamp, WM_COMMAND, command_name, 0);
# Winamp volume up is WIN_COMMAND 40058
win32api.SendMessage(hWinamp, 40058, 0, 0)

I can't get any response, it always returns 0 and does nothing. One thing I'm wondering about is the command_name parameter (2nd from last parameter above), if I use a non-integer I always get an error saying it wants an integer, so I'm just using 0.

Anyway, any help would be so appreciated.