Re: writing to gui from thread

From:

"Jinny King" <jinnyking@126.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 21 Feb 2007 15:44:46 +0800

Message-ID:

<eltlrwYVHHA.600@TK2MSFTNGP05.phx.gbl>

I think that the AfxGetMainWnd() in the thread cause the asserttion. Because
the main window associated with the thread maybe different with the
application main window. you can use AfxGetApp()->m_pMainWnd to instead of
the AfxGetMainWnd().

"kunal s patel" <kunalspatel@discussions.microsoft.com> ????????????:009D9EA4-71B6-4DFB-91F7-9A18E36092FC@microsoft.com...

Hi all,
Here is a part of code:

#include "maindlg.h"

UINT MyThread(LPVOID obj); //thread function definition
class Cmaindlg
{
//this is the class of main gui with a listbox
CListbox m_listbox;
};

#include "sim.h"
#include "maindlg.h"

class sim
{
  //another file
  void proc(); //this function access the gui
  void run();
}

Now when someone press a button in maindlg application i spawn a thread
like this:

UINT MyThread(LPVOID obj)
{
   sim s;
   s.proc();
}

The function proc is defined as

void sim::proc()
{
  Cmaindlg* pmain = (Cmaindlg*) AfxGetMainWnd();
  pmain->m_listbox.AddString("Hi");
}

Now when i try to run this application, i get an assertion error. I am not
able to understand what is going wrong. Can anyone explain me the way out
of
it. Basically i want to access the gui objects from thread.

thanks
kunal