Re: How to catch WM_PAINT use Hook in Dialog?

From:

"green" <greenabc300@163.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 6 Jun 2007 10:41:25 +0800

Message-ID:

<uyi4IO#pHHA.960@TK2MSFTNGP03.phx.gbl>

Dear,

m_pParentWnd -----------is a static member of the class,
and my CALLBACK function is static member of the class,
And I have send you my test hook code to newcomer@flounder.com ,if you have
any time.

Thanks
Green
2007-06-06

"Joseph M. Newcomer" <newcomer@flounder.com>
??????:d3ab63pisc059kb9uhdq628d0l9v7t3gl8@4ax.com...

On Tue, 5 Jun 2007 12:47:06 +0800, "green" <greenabc300@163.com> wrote:

m_hCallWndhook =

SetWindowsHookEx(WH_CALLWNDPROC,CallWndProc,/*NULL*/AfxGetApp()->m_hInstanc

,GetCurrentThreadId());

LRESULT C***::CallWndProc(int nCode, WPARAM wParam, LPARAM lParam)
{

****
presumably this is declared as

static LRESULT CALLBACK CallWndProc(int, WPARAM, LPARAM);

so why is the word CALLBACK missing in the above declaration?
****

CWPSTRUCT* cwps = (CWPSTRUCT*)lParam;

if ( cwps->hwnd != m_pParentWnd->m_hWnd ) //if is not the Dialog

return.

****
What is m_pParentWnd? It can't be a class member of the class because

this function

cannot be a class member function, so what is it?
****

return

CallNextHookEx(m_hCallWndhook,nCode,wParam,lParam);

****
Likewise, m_hCallWndhook cannot be a class member because the callback

cannot have access

to any member variable, because it must be static.

I have a suspicion that you have deeper problems here. Fix all the above

problems first.

joe
****

        CString str;
        str.Format("nCode:%d ,wParam:%d ,lParam:%d ,
message:0x%04X.\r\n",nCode,wParam,lParam,cwps->message);
        //OutputDebugString(str);

        if( cwps->message == WM_PAINT )
                 OutputDebugString(_T("----------------WM_PAINT

..\r\n"));

         if( cwps->message == WM_ERASEBKGND )
                 OutputDebugString(_T("----------------WM_ERASEBKGND
.\r\n"));

        return CallNextHookEx(m_hCallWndhook, nCode, wParam, lParam);
}

"Tom Serface" <tom.nospam@camaswood.com>
??????:64390268-6EE2-4970-88EF-5814EB0F4A63@microsoft.com...

Could you post a bit of the code? Why are you trying to hook WM_PAINT
rather than just putting you code into the OnPaint() routine?

Tom

"green" <greenabc300@163.com> wrote in message
news:%23zbVbdypHHA.4120@TK2MSFTNGP06.phx.gbl...

Dear all,

I used WH_CALLWNDPROC,
but in the hook function, WM_PAINT can only catch once (only when

dialog

Create'), Then OnPaint is called ,but in Hook function ,I do not

catch

WM_PAINT.

Thanks
green
2007-06-05

Joseph M. Newcomer [MVP]
email: newcomer@flounder.com
Web: http://www.flounder.com
MVP Tips: http://www.flounder.com/mvp_tips.htm