画图中出现图像闪烁的问题？？？？？？？？？？？？？？？？？

Question

CDC mem;
mem.CreateCompatiableDC(pDC);一切向mem上画，等画完了再bitblt到pdc

Answer 1

void CMyButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct) 
{
// TODO: Add your code to draw the specified item
CDC *pDC;
RECT rect;
CDC dcMem;

int nHeight;
int nWidth; UINT uStyle; rect = lpDrawItemStruct->rcItem ;
pDC = CDC::FromHandle (lpDrawItemStruct->hDC );
dcMem.CreateCompatibleDC (pDC); nHeight = rect.bottom - rect.top ;
nWidth = rect.right - rect.left ; uStyle = DFCS_BUTTONPUSH | DFCS_PUSHED; //::DrawFrameControl (lpDrawItemStruct->hDC, &lpDrawItemStruct->rcItem, DFC_BUTTON, uStyle);
::DrawFrameControl (dcMem.m_hDC , &lpDrawItemStruct->rcItem, DFC_BUTTON, uStyle); // Resize rect
rect.left += frame_width;
rect.top += frame_width;
rect.right -= frame_width;
rect.bottom -= frame_width; CBrush brush(bkColor);
//pDC->FillRect (&rect, &brush);
dcMem.FillRect (&rect,&brush); pDC->BitBlt (lpDrawItemStruct->rcItem .left ,lpDrawItemStruct->rcItem .top ,
         lpDrawItemStruct->rcItem .right - lpDrawItemStruct->rcItem .left ,
 lpDrawItemStruct->rcItem .bottom - lpDrawItemStruct->rcItem .top ,
 &dcMem, lpDrawItemStruct->rcItem .left ,lpDrawItemStruct->rcItem .top ,
 SRCCOPY); if ( type ) // Draw Left
{
draw1(pDC, rect);
}
else // Draw Right
{
draw2(pDC, rect);
}

}bitblt以后没有效果啊！

Answer 2

CWnd::SetRedraw is the only function to meet you.

Answer 3

CWnd::OnEraseBkgnd  
afx_msg BOOL OnEraseBkgnd( CDC* pDC );重载这个函数，然后 返回FALSE，就是说永远也不重画背景，或者加上适当的控制，尽量不重画背景

Answer 4

那位大虾有空帮我看看程序，留下EMail，我发给他，