Re: Thread function and class member function and variable access

From:

"AliR" <AliR@online.nospam>

Newsgroups:

microsoft.public.vc.mfc

Date:

Wed, 2 Aug 2006 10:58:05 -0500

Message-ID:

<44d0cbd3$0$23695$a8266bb1@reader.corenews.com>

The thread function has to be a static method of the class, and static
methods of the class don't have a this pointer, therefore they can't call
any non static methods of the class.

The solution to you problem is to pass the this pointer to the thread
fuction in the parameter of the thread function

void foo::StartThread(void)
{
CWinThread* pwt;
pwt = AfxBeginThread(this->ThreadProc, this);
}

UINT foo::ThreadProc(LPVOID pvData)

{

foo *pFoo = (foo *) pvData;
ASSERT(pFoo);

CString csMsg = _T("i = ");
csMsg += iValue;
AfxMessageBox(csMsg);

pFoo->ErrorReport(_T("Error: ThreadProc"));

return 1;
}

AliR.

"awu" <awu10@hotmail.com> wrote in message
news:1154530141.617543.216410@i3g2000cwc.googlegroups.com...

All:
There are some discussions about this topic back to 2003. I still
don't really clear about the solution. I am using .NET 2005 MFC
application. I have a class definition as follows. Inside thread
function, I want to call private variable or public function from the
same class, I got the same error C2597: illegal reference to non-static
member 'foo::iValue', 'foo::ErrorReport'. How do I do to let my thread
function that can call class member variable and function?

By the way, this class is initalized in view object from MFC framework.

I have a class as follows:

#pragma once
class foo
{
public:
foo();
~foo();

void StartThread(void);
static UINT ThreadProc(LPVOID pvData);

void ErrorReport(CString csError);
private:
int iValue;
};

#include "stdafx.h"
#include "foo.h"

foo::foo()
{
iValue = 10;
}

foo::~foo()
{
}

void foo::StartThread(void)
{
CWinThread* pwt;
pwt = AfxBeginThread(this->ThreadProc, NULL);
}

UINT foo::ThreadProc(LPVOID pvData)
{
CString csMsg = _T("i = ");
csMsg += iValue;
AfxMessageBox(csMsg);

ErrorReport(_T("Error: ThreadProc"));
return 1;
}

void foo::ErrorReport(CString csError)
{
AfxMessageBox(csError);
}

Thank you so much for the help
awu10