Remy Lebeau (TeamB)

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2 total messages Started by Jim Donachiue Mon, 24 Mar 2003 20:15

#17431

Author: Jim Donachiue
Date: Mon, 24 Mar 2003 20:15

50 lines
2578 bytes

Having problems with replying with Lotus Notes installled...

In any case, I must communicate both ways with VB app and I have the HWND.

I was under the impression I need to use:

const WM_JM_CTTR_COMM = RegisterWindowMessage("JobMasterExtMsgA");

struct TWM_JM_CTTR_Comm
{
 unsigned Msg;
  UINT wParam;
  LONG lParam;
} ;

//MESSAGE LONG OnJobMasterExtMsgA (UINT wParam, LONG lParam);
//MESSAGE LONG OnJobMasterExtMsgA (TWM_JM_CTTR_Comm);
MESSAGE LONG OnJobMasterExtMsgA (TMessage &AMess);

BEGIN_MESSAGE_MAP
    VCL_MESSAGE_HANDLER(WM_JM_CTTR_COMM, TMessage, OnJobMasterExtMsgA)
END_MESSAGE_MAP(TForm)


but when I compile I get an error E2313 Constant expression required for the
line:
VCL_MESSAGE_HANDLER(WM_JM_CTTR_COMM, TMessage, OnJobMasterExtMsgA)

Any ideas?

"Jim Donachiue" <jdonachiue@bjservices.ca> wrote in message
news:3e7f6162$1@newsgroups.borland.com...

> I am using C++ Builder version 4 and I am trying to
> cummunicate with a VB app.

Communication is what way exactly?  Will you be sending the message to the
VB app, or the other way around?  Please be more specific.

If the former, than do you have the HWND for the VB app?  You'll need to
obtain that because you can use SendMessage().  If you do have it, then just
call RegisterWindowMessage() and pass the return value as the uMsg parameter
of SendMessage().

If the latter, then you need to call RegisterWindowMessage() at program
startup, store the return value to a variable, then have your form override
the inherited WndProc() method to test messages for that value.


Gambit

Re: Remy Lebeau (TeamB)

#17435

Author: Remy Lebeau (TeamB)
Date: Mon, 24 Mar 2003 21:21

18 lines
1652 bytes

"Jim Donachiue" <jdonachiue@bjservices.ca> wrote in message
news:3e7f677e@newsgroups.borland.com...

> BEGIN_MESSAGE_MAP
>     VCL_MESSAGE_HANDLER(WM_JM_CTTR_COMM, TMessage, OnJobMasterExtMsgA)
> END_MESSAGE_MAP(TForm)

You can't use RegisterWindoweMessage() with a MESSAGE_MAP.  The compiler
expects the MESSAGE_MAP values to be compile-time constants, thus they need
to be known to the compiler ahead of time.  But RegisterWindowMessage()
return a dynamic run-time value that is not known until the application is
actually running, thus the compiler has nothing to compile with.  That is
why I mentioned earlier that you'll have to override your form's inherited
WndProc() method in order to intercept the registered message.


Gambit

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