Re: Send message issue

From:

nicetom786@yahoo.com

Newsgroups:

microsoft.public.vc.mfc

Date:

5 Jun 2006 08:03:06 -0700

Message-ID:

<1149519786.682952.259720@i39g2000cwa.googlegroups.com>

Hi David and Scotts,

Thanks for your response.I could get the concept of using SendMessage()

I used the function and I get an assertion which says the window is
null.

CView->Tabctrl->Dialog->CCMyListCtrl.mv->SendMessage(WM_INSERT_ITEMS,0,0);

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

How should I get the window to be not null.
Since Every control is subclassed ,I declared the variables in CView
CMyTabCtrl is a variable of CView
CMyDialog is a variable of CMyTabCtrl
CMyListCtrl is a variable of CMyDialog

Where am I going wrong
I get an assertion in the file afxwin2.inl line 43

AFXWIN_INLINE LRESULT CWnd::_AFX_FUNCNAME(SendMessage)(UINT message,
WPARAM wParam, LPARAM lParam)
{ ASSERT(::IsWindow(m_hWnd)); return ::SendMessage(m_hWnd, message,
wParam, lParam); }

mfc80d.dll!CWnd::SendMessageA(unsigned int message=32869, unsigned int wParam=0, long lParam=0) Line 42 + 0x28 bytes C++

David Webber wrote:

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp> wrote in message
news:ePoZBnphGHA.2340@TK2MSFTNGP03.phx.gbl...

nicetom786@yahoo.com wrote:

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

I'll just add that when using the API function rather than the CWnd member,
I find it useful to write always

::SendMessage(...)

with the double colon prefix. It reminds me what I'm doing!

Dave
--
David Webber
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