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Problem with WM_USER message

Posted on 2000-03-09
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Last Modified: 2013-11-20
Hi,

I have a problem with WM_USER message. I have a class CRichListBox, child from CListBox. I overriden method
OnLButtonDown(UINT nFlags, CPoint point) this way:

//RichListBox.h:
#define WM_USER_RICHLISTBOX_LINK      WM_USER+0x1235

//RichListBox.cpp:

void CRichListBox::OnLButtonDown(UINT nFlags, CPoint point) {      
  //do something...
 
  //Send WM_USER message to parent
  GetParent()->SendMessage(WM_USER_RICHLISTBOX_LINK, 0, 0);
}


Dialog class:

//C_MFC_TESTDlg.h:

class C_MFC_TESTDlg : public CDialog
{
//...
  //{{AFX_MSG(C_MFC_TESTDlg)
  //...
  afx_msg void OnLink();
  //}}AFX_MSG
  DECLARE_MESSAGE_MAP()
//...
};


//C_MFC_TESTDlg.cpp:
//...
BEGIN_MESSAGE_MAP(C_MFC_TESTDlg, CDialog)
  //{{AFX_MSG_MAP(C_MFC_TESTDlg)
  //...
  ON_MESSAGE(WM_USER_RICHLISTBOX_LINK, OnLink)
 //}}AFX_MSG_MAP
END_MESSAGE_MAP()

//...

void C_MFC_TESTDlg::OnLink() {
  //...
}

This construction works fine in Debug version (Debug configuration). But in Release vesion I get "This program has performad an illegal operation..." e.g. program crashed.

Someone can tell me why this happens? May be I need to delete message after processing?

regards,
 mahno
0
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Question by:mahno
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2 Comments
 
LVL 8

Accepted Solution

by:
VinExpert earned 50 total points
ID: 2600118
Hi,

Change Ur function declaration to

afx_msg void OnLink(WPARAM wParam, LPARAM lParam);

And function as
void C_MFC_TESTDlg::OnLink(WPARAM wParam, LPARAM lParam)
{
            //...
}

Hope this helps.

VinExpert
0
 
LVL 1

Author Comment

by:mahno
ID: 2600359
Thanx
0

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