I'm using SendMessage API to send messages between two applications in the
same machine, but, I need to do this process in an asynchronous way. I'm
probing replacing sendmessage API with the sendmessagecallback API, but i'cant
make that sendmessagecallback API send the message. The SendMessage API is
working well. I know that I should define a callBack Function, I think that
its Ok, but I dont know why I can't send and recive the message using sendmessageCallBack
Can somebody help me?