Mình thấy có 1 bài vd trong sách programming MFC như sau:

// file Hello.h
class CMyApp : public CWinApp
{
public:
    virtual BOOL InitInstance ();
};

class CMainWindow : public CFrameWnd
{
public:
    CMainWindow ();

protected:
    afx_msg void OnPaint ();
    DECLARE_MESSAGE_MAP ()
};

// file Hello.cpp
#include <afxwin.h>
#include "Hello.h"

CMyApp myApp;

BOOL CMyApp::InitInstance ()
{
    m_pMainWnd = new CMainWindow;
    

   m_pMainWnd->ShowWindow (m_nCmdShow);
    m_pMainWnd->UpdateWindow ();
    return TRUE;
}

BEGIN_MESSAGE_MAP (CMainWindow, CFrameWnd)
    ON_WM_PAINT ()
END_MESSAGE_MAP ()

CMainWindow::CMainWindow ()
{
    Create (NULL, _T ("The Hello Application"));
}

void CMainWindow::OnPaint ()
{
    CPaintDC dc (this);
    
    CRect rect;
    GetClientRect (&rect);

    dc.DrawText (_T ("Hello, MFC"), -1, &rect,
        DT_SINGLELINE ¦ DT_CENTER ¦ DT_VCENTER);
}

Vậy mà mình copy y chang, bỏ vô VC6++ hoặc VS2008 đều k dùng dc. Nó báo lỗi như sau:
"fatal error C1010: unexpected end of file while looking for precompiled header directive"

Bạn nào bít bị sao không? chỉ mình với, huhu