Re: Posting Registered message to another process?

"David Ching" <>
Fri, 21 Dec 2007 19:50:18 GMT
"L.Allan" <> wrote in message

I want to communicate between two SDI processes with something like:
PostMessage(HWND_BROADCAST, gMyRegMsgId, 123, 321);

The "Poster" and "Postee" both have calls in OnInitialUpdate for:

***** Poster code ****
void CPosterRegMsgView::OnClickPostButton()
 BOOL flag = ::PostMessage(HWND_BROADCAST, gBbFindMsgId, 1234, 4321);

***** Postee code ****
BEGIN_MESSAGE_MAP(CPosteeRegMsgView, CFormView)

LRESULT CPosteeRegMsgView::OnBbFindMsgId(WPARAM wParam, LPARAM lParam)
 CString msg;
 msg.Format("W: %d L: %d", wParam, lParam);
 ::MessageBox(NULL, msg, "CPosteeRegMsgView", MB_OK);
 return 0;


With the above, I can step through each of the programs and check that
gMyRegMsgId is the same. However, when I click on the button of the
"Poster" program, nothing seems to be received by the "Postee" program.
I'm expecting the MessageBox to show up, confirming the desired

What am I doing wrong? Is the HWND_BROADCAST argument to PostMessage

PostMessage(HWND_BROADCAST) only posts the message to top-level (not child)
windows; since your view is the child of the MainFrame, it doesn't get the
message. You need to catch the message in CMainFrame and either handle it
there or delegate it to the active view.

-- David

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