Re: mediaplayer generate WM_SYNCPAINT by every picture change - my programm flickers

Hello Steve,

I make a try with the example program 'ParticleTest' from codeproject - which use CMemDC.

I add an own control class to the project - and this class flickers.

I add an new Button class:

----------------------------------------

// CMyBut

class CMyBut : public CButton

{

    DECLARE_DYNAMIC(CMyBut)

public:

    CMyBut();

    virtual ~CMyBut();

    void DrawItem(LPDRAWITEMSTRUCT lpDIS);

protected:

    DECLARE_MESSAGE_MAP()

public:

    afx_msg BOOL OnEraseBkgnd(CDC* pDC);

};

...

BEGIN_MESSAGE_MAP(CMyBut, CButton)

    ON_WM_ERASEBKGND()

END_MESSAGE_MAP()

// CMyBut message handlers

void CMyBut::DrawItem(LPDRAWITEMSTRUCT lpDIS)

{

    CDC *pDC_ = CDC::FromHandle(lpDIS->hDC);

    CMemDC pDC(pDC_);

    CString s = "hallo";

    RECT rClient = lpDIS->rcItem;

    pDC->DrawText(s, &rClient, DT_CENTER);

}

BOOL CMyBut::OnEraseBkgnd(CDC* pDC)

{

    // TODO: Add your message handler code here and/or call default

    return FALSE;

}

----------------------------------------

I put one button in the view.

----

but1 = new CMyBut();

RECT rect = {80,0,180,40};

but1->Create(TEXT("HH"),WS_CHILD|WS_VISIBLE|BS_OWNERDRAW, rect, this, 112233);

----

And the button flickers - what is wrong ?

The programm without the button - does not flicker in the view.

The menubar and the toolbar flickers - but that is OK for me and my program.

But the flickering from my own control 'CMyBut' is the problem.

---

Frank Iversen