CompuServe Messages

Jim, I don't see anything fundamentally wrong with your reasoning here, but I would point out that as a matter of implementation, you should not be replying a NULL message… you seem to have already determined (perhaps through debugging it) that you are getting a NULL message, so don't reply if it is. It's kinda hard to say exactly what's happening, but you should be doing something like… alive = TRUE; while(alive) { plot_pixels(); if( msg = GetMsg( window->UserPort ) ) { if( msg->Class == MOUSEBUTTONS ) alive = FALSE; ReplyMsg( msg ); } } while( msg = GetMsg( window->UserPort ) ) ReplyMsg( msg ); CloseWindow( window ); .. this is a bit simplified, but was meant to point out that you should only reply to a messsage _if_ you get one. – Keith