Visual C++ and MFC Programming 2nd Edition

Visual C++ and MFC Fundamentals Chapter 5: The Document/View Architecture

afx_msg void OnPaint()

Practical Learning: Using the Paint Message

1. To use the structure of the WM_PAINT message, change the program as follows:

#include <afxwin.h>

class CMainFrame : public CFrameWnd

{

public:

CMainFrame ();

protected:

afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);

afx_msg void OnShowWindow(BOOL bShow, UINT nStatus);

afx_msg void OnActivate(UINT nState, CWnd* pWndOther, BOOL bMinimized);

afx_msg void OnPaint();

DECLARE_MESSAGE_MAP()

};

CMainFrame::CMainFrame()

{

// Create the window's frame

Create(NULL, "Windows Application", WS_OVERLAPPEDWINDOW,

CRect(120, 100, 700, 480), NULL);

}

class CExerciseApp: public CWinApp

{

public:

BOOL InitInstance();

};

BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)

ON_WM_CREATE()

ON_WM_SHOWWINDOW()

ON_WM_ACTIVATE()

ON_WM_PAINT()

END_MESSAGE_MAP()

int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)

{

if (CFrameWnd::OnCreate(lpCreateStruct) == -1)

return -1;

return 0;

}

void CMainFrame::OnShowWindow(BOOL bShow, UINT nStatus)

{

CFrameWnd::OnShowWindow(bShow, nStatus);

// TODO: Add your message handler code here

//ShowWindow(SW_SHOW);

}

void CMainFrame::OnActivate(UINT nState, CWnd* pWndOther, BOOL bMinimized)

{