Re: multi-thread problem

From:

"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 14 Jun 2006 23:39:33 -0400

Message-ID:

<eJTu11CkGHA.1324@TK2MSFTNGP04.phx.gbl>

cdg wrote:

I'm still having problems with this simple worker thread program. And I'm
still not sure how to write the cast for controller function. Could you
correctly write any incorrect statements. And also, I had another question.
I have found that there must be some procedure to correctly place the
message receiving function into the program. Is it placed with the wizard or
manually and static, public or private. And the message maps seem to be
causing some unusual problem. Here is what I've added:

// Generated message map functions
//{{AFX_MSG(CThreadTestDlg)
virtual BOOL OnInitDialog();
afx_msg void OnSysCommand(UINT nID, LPARAM lParam);
afx_msg void OnPaint();
afx_msg HCURSOR OnQueryDragIcon();
afx_msg void OnStart();
afx_msg LRESULT OnThreadFinished(UINT wParam, LONG lParam);
//}}AFX_MSG
ON_MESSAGE(UWM_THREAD_FINISHED, OnThreadFinished);

This line belongs in the message map (in the cpp file).

DECLARE_MESSAGE_MAP()
private:
static UINT Thread1(LPVOID lParam);

This line declares Thread1 with a parameter.

Are there any steps involved in adding these statements. I am getting
these errors:
error C2059: syntax error : '{'
error C2334: unexpected token(s) preceding '{'; skipping apparent function
body

------------------------------------------

I am getting this error message for code:
error C2660: 'Thread1' : function does not take 0 parameters

UINT CThreadTestDlg::Thread1(LPVOID lParam)
{
CThreadTestDlg* pDlg = (CThreadTestDlg *)lParam;
pDlg->Thread1();

This line calls a Thread1 function that does not have a parameter. It
does not match your declarations. The compiler error message appears to
be clear and correct. It is hard to understand why you don't understand
this error: You are calling a function that you have not declared.

long Num = 123456789;

pDlg->PostMessage(UWM_THREAD_FINISHED, (WPARAM)0, (LPARAM)Num);
return 0;
}

LRESULT OnThreadFinished(UINT wParam, LONG lParam)

This line's parameters do not match your declarations.

{
return 0;
}

void CThreadTestDlg::OnStart()
{
AfxBeginThread(Thread1, this);
}

-----------------------------------------

--
Scott McPhillips [VC++ MVP]