🚀 go-pugleaf

"Nate" <RNLockwood@attglobal.net> wrote in message
news:44035e7c$1@newsgroups.borland.com...

> The receiver addess is the handle to the application but
> the receiver code is in the main form - does this matter?

Yes!  That is what I keep explaining to you.  You are not handling the
message from the context of the window that actually receives it.

> What should SendMessage return on success?

Whatever the receiver of the message returns.  Messages have a return value
of 0 by default.  You should have your message handler explicitally set the
result to TRUE.  The Win32 API documentation even says as much:

    "If the receiving application processes this message, it should return
TRUE; otherwise, it should return FALSE. "

Then, in the process that is sending the message, you can check the message
result to make sure that it was actually processed.  For example:

    if( Message.Msg == WM_COPYDATA )
    {
        //...
        if( ... is my message ... )
        {
            //...
            Message.Result = TRUE;
        }
        //...
    }


    if( ::SendMessage(hReceiver, WM_COPYDATA, ...) == TRUE )
        // message was processed ...
    else
        // message was not processed ...


Gambit