Re: Send message issue

From:

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>

Newsgroups:

microsoft.public.vc.mfc

Date:

Fri, 02 Jun 2006 19:09:41 -0400

Message-ID:

<ePoZBnphGHA.2340@TK2MSFTNGP03.phx.gbl>

nicetom786@yahoo.com wrote:

Even though I use SendMessage I get an error-

SendMessageA does not take 4 parameters.

1>c:\\samples\\cml\mylistctrl.cpp(92) : error C2660:
'CWnd::SendMessageA' : function does not take 4 arguments

The code was

void CMyListCtrlOne::OnNMClick(NMHDR *pNMHDR, LRESULT *pResult)
{
//CFrameWnd * pFrame = (CFrameWnd *)(AfxGetApp()->m_pMainWnd);
//now get the view from that
//CCView *mv = (CCView*)pFrame->GetActiveView();

SendMessage(mv->m_myCtrlTab.userDlg->m_myListCtrTwo,WM_INSERT_ITEMS,0,0);
}

Why this happens and what is the way to correct this

When you call SendMessage from inside a CWnd-derived class the compiler
assumes you mean to call CWnd::SendMessage, which takes 3 parameters.

When you call SendMessage from a non-CWnd class (CDocument) the compiler
assumes you mean to call the 4-parameter SendMessage API. But you are
calling it incorrectly: its first parameter must be an HWND.

Use CWnd::SendMessage in both cases:

GetCurrntView()->m_myListctrl.SendMessage(
    WM_MY_MESSAGE,
     0,
     0);

mv->m_myCtrlTab.userDlg->m_myListCtrTwo.SendMessage(WM_INSERT_ITEMS,0,0);

--
Scott McPhillips [VC++ MVP]