To use the structure of the WM_PAINT message

[sukishan]

Using the Paint Message

#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)
{
    CFrameWnd::OnActivate(nState, pWndOther, bMinimized);
   
    // TODO: Add your message handler code here
    switch( nState )
    {
    case WA_ACTIVE:
        SetWindowText("This window has been activated, without the mouse!");
        break;
    case WA_INACTIVE:
        SetWindowText(
            "This window has been deactivated and cannot be changed now!!");
        break;
    case WA_CLICKACTIVE:
        SetWindowText("This window has been activated using the mouse!!!");
        break;
    }   
}

void CMainFrame::OnPaint()
{
    CFrameWnd::OnPaint();

    SetWindowText("The window has been painted<==>");
}

BOOL CExerciseApp::InitInstance()
{
    m_pMainWnd = new CMainFrame ;
    m_pMainWnd->ShowWindow(SW_SHOW);
    m_pMainWnd->UpdateWindow();

    return TRUE;
}

CExerciseApp theApp;Test the application and return to MSVC.