Re: writing to gui from thread

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.