multi-thread problem

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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);
}


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