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| 发表于：2008-01-12 17:01:27 楼主 |
请大家告诉我问题出在哪儿？一个pDC、一个pMyDC、一个成员变量m_pFillDC，三个dc中贴图，当执行第二个Bitblt时贴图位置不对，
需要刷新一次才能正确显示，
void CDisplayView::OnDraw(CDC* pDC)
{
GetClientRect(&rect);
CDC *pMyDC = new CDC();
CBitmap bitmap;
pMyDC->CreateCompatibleDC(pDC);
ASSERT(pMyDC->m_hDC != NULL);
bitmap.CreateCompatibleBitmap(pDC, rect.Width(),rect.Height());
m_pOldBmp = pMyDC->SelectObject(&bitmap);
ASSERT(pMyDC->m_hDC!=NULL);
pMyDC->SetMapMode(pDC->GetMapMode());
pDC->DPtoLP(&rect);
pMyDC->SetWindowOrg(rect.left, rect.top);
pMyDC->FillSolidRect(rect, pDC->GetBkColor());
if(m_bFill)
FillDC(pMyDC);//在这函数里对m_pFillMemDC进行绘图
pMyDC->BitBlt(rect.left, rect.top, rect.Width(), rect.Height(),
m_pFillDC, rect.left, rect.top, SRCCOPY);
DrawOthers(pMyDC, pDoc);
pDC->BitBlt(rect.left, rect.top, rect.Width(), rect.Height(),
pMyDC, rect.left, rect.top, SRCCOPY);
delete pMyDC;
pMyDC = NULL;
}
void CDisplayView::FillDC(CDC *pTempDC)
{
COtdrDoc *pDoc;
pDoc = (COtdrDoc *)GetDocument();
ASSERT_VALID(pDoc);
GetClientRect(&m_LgRect);
CBitmap bitmap;
ASSERT(m_pFillDC != NULL);
if(m_pFillDC->GetSafeHdc())
m_pFillDC->DeleteDC();
m_pFillDC->CreateCompatibleDC(pTempDC);
ASSERT(m_pFillDC->m_hDC != NULL);
bitmap.CreateCompatibleBitmap(pTempDC, m_LgRect.Width(),m_LgRect.Height());
m_pOldBmp = m_pFillDC->SelectObject(&bitmap);
ASSERT(m_pFillDC->m_hDC!=NULL);
m_pFillDC->SetMapMode(pTempDC->GetMapMode());
pTempDC->DPtoLP(&m_LgRect);
m_pFillDC->SetWindowOrg(m_LgRect.left, m_LgRect.top);
m_pFillDC->FillSolidRect(m_LgRect, pTempDC->GetBkColor());
DrawBKGrid(pDoc, m_pFillDC);
DrawLine(pDoc, m_pFillDC);
DrawFlag(pDoc, m_pFillDC, pTempDC);
}
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