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