Albert.W的窝儿

一段小代码：
//**********Hello.h***********
#pragma once
#include "afxwin.h"

class CMyApp :
 public CWinApp
{
public:
 CMyApp(void);
 ~CMyApp(void);
 virtual BOOL InitInstance();
};

class CMainWindow :
 public CFrameWnd
{
public:
 CMainWindow(void);
 ~CMainWindow(void);
protected:
 afx_msg void OnPaint();
 DECLARE_MESSAGE_MAP();
}

//************Hello.cpp************
#include <afxwin.h>
#include ".\hello.h"

CMyApp myApp;

CMyApp::CMyApp(void)
{
}

CMyApp::~CMyApp(void)
{
 }

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

CMainWindow::~CMainWindow(void)
{
}

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()

void CMainWindow::OnPaint()
{
 CPaintDC dc(this);
 CRect rect;
 GetClientRect(&rect);
 dc.DrawText(_T("Hello World") , -1 , &rect , DT_SINGLELINE|DT_CENTER|DT_VCENTER);
}