vc6.0和vs2008同样代码不同结果

tmwanly 2012-11-28 09:35:59

void ThreadFunc()

{

	CTime time;

	CString strTime;

	m_bRun=TRUE;

	while(m_bRun)

	{

		time=CTime::GetCurrentTime();

		strTime=time.Format("%H:%M:%S");       

		::SetDlgItemText(AfxGetApp()->GetMainWnd()->m_hWnd,IDC_EDIT1,strTime);

                //::SetDlgItemText(AfxgetMainWnd()->m_pMainWnd->m_hWnd,IDC_EDIT1,strTime);可以

		//::SetDlgItemText(AfxGetMainWnd()->m_hWnd,IDC_EDIT1,strTime);不可以

		Sleep(1000);

	}

}

为什么::SetDlgItemText(AfxGetMainWnd()->m_hWnd,IDC_EDIT1,strTime);在vc6.0中可以用但是在vs2008不可以用呢，运行后会出现错误，调试运行箭头停在
::SetDlgItemText(AfxGetMainWnd()->m_hWnd,IDC_EDIT1,strTime);
有木有人知道是为什么呢，而且按理说这种错误应该是不会发生的。

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yisikaipu 2012-11-28

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补充：查 VC6 的 AfxGetMainWnd，会发现与新版的一致问题出在其内部调用的 AfxGetThread VC6 MSDN： Pointer to the currently executing thread. VC9(VS2005) MSDN：http://msdn.microsoft.com/en-us/library/0aa1ya36(v=vs.90).aspx Pointer to the currently executing thread; otherwise NULL. 而且有个Note： If you are porting an MFC project calling AfxGetThread from Visual C++ versions 4.2, 5.0, or 6.0, AfxGetThread calls AfxGetApp if no thread is found. In Visual C+ .NET and later, AfxGetThread returns NULL if no thread was found. If you want the application thread, you must call AfxGetApp. VC6会自动调用AfxGetApp，而VC9则返回NULL

shen_wei 2012-11-28

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编译的方式不一样，应该使用最新的编译器。。。跟上时代！！

Cppinsider 2012-11-28

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两个编译器相隔有些时间了，肯定有些不同。 VC6.0，VS2005, VS2010都用过的打酱油路过。

qin_zhu 2012-11-28

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引用 1 楼 qin_zhu 的回复:

Return Value: If the server has an object that is in-place active inside a container, and this container is active, this function returns a pointer to the frame window object that contains the in-pla……

上面说的是 AfxGetMainWnd（）。。。

qin_zhu 2012-11-28

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Return Value: If the server has an object that is in-place active inside a container, and this container is active, this function returns a pointer to the frame window object that contains the in-place active document. If there is no object that is in-place active within a container, or your application is not an OLE server, this function simply returns the m_pMainWnd of your application object. Remarks: If your application is not an OLE server, then calling this function is equivalent to directly referring to the m_pMainWnd member of your application object. 根据MSDN所说，在vc6.0、vs2008中你的应用程序性质不同，导致其返回结果也不一样，所以调用的形式也不同。 ps:这两个编译器默认编码方式也不同，所以调用方式上可能也会受影响。。。。

yisikaipu 2012-11-28