multi-thread problem

   I am not sure how to correctly write this Worker Thread example program.
And I realize that this specific problem is somewhat more of a C++ issue.
But I really needed to make sure that I was correctly writing this part of
the program.
   I've also encountered another problem, but I thought it could be
connected with this first problem here. However, I would hoped to ask about
it later.

   How do you write the statement that "post" the long integer in the
Controller thread to the receiving function.

UINT CThreadTestDlg::Thread1(LPVOID lParam)
{
     CThreadTestDlg* pHwnd = (CThreadTestDlg *)lParam; //**is this
correct**
     pHwnd->Thread1();
//**is this correct**

   long Num = 123456789; //need to post this long int

    ::PostMessage((HWND)pHwnd, UWM_THREAD_FINISHED, (WPARAM)0, (LPARAM)Num);
    return 0;
}

LRESULT CThreadTestDlg::OnThreadFinished(UINT wParam, LONG lParam)
{
    return 0;
}

void CThreadTestDlg::OnStart() //button to start worker thread
{
    AfxBeginThread(Thread1, this);
}