mfc,vc 禁止标题栏重绘,改变标题栏，双缓冲标题栏贴图

需要在标题栏上贴图，更换标题栏背景的时候，不想要标题栏显示颜色，尤其拉动改变窗体大小的时候，所以需要禁止标题栏重绘的方法。

只需要 处理WM_NCPAINT消息就好了，消息处理函数OnNcPaint中去掉CDialog::OnNcPaint()，从此世界安静了

标题栏更换颜色，标题栏贴图，窗体其他位置贴图也可以用这里的贴图函数

//*******************************************************************//

void CMyDlg::DrawTitleBar(CDC *pDC)
{
 CDC memDC;
 CBitmap bmp;
 CRect rect, rtTitle;
 CPoint point;
 GetClientRect(rect);

 //获取标题栏大小
 rtTitle.left = GetSystemMetrics(SM_CXFRAME);
 rtTitle.top = GetSystemMetrics(SM_CYFRAME);
 rtTitle.right = rect.right - rect.left - GetSystemMetrics(SM_CXFRAME);
 rtTitle.bottom = rtTitle.top + GetSystemMetrics(SM_CYSIZE);

 point.x = rect.right  + GetSystemMetrics(SM_CXFRAME);
 point.y = 30;

 memDC.CreateCompatibleDC(NULL);
 bmp.CreateCompatibleBitmap(pDC,point.x,point.y);
 CBitmap *pOldBit=memDC.SelectObject(&bmp);

 //背景颜色
 memDC.FillSolidRect(0,0,point.x,point.y,RGB(125,0,125));

 贴图
 //CBitmap pic;
 //pic.LoadBitmap(IDB_BITMAP1);
 //ShowBitmap(&memDC,0,0, rtTitle.right, 30, pic);

 pDC->BitBlt(0,0,point.x,point.y,&memDC,0,0,SRCCOPY);
 
 pOldBit->DeleteObject();
 memDC.DeleteDC();
 bmp.DeleteObject();

}

LRESULT CMyDlg::DefWindowProc(UINT message, WPARAM wParam, LPARAM lParam)
{
 //return CDialog::DefWindowProc(message, wParam, lParam);
 
 LRESULT lrst=CDialog::DefWindowProc(message, wParam, lParam);

 if (message==WM_MOVE||message==WM_PAINT||message==WM_NCPAINT||message==WM_NCACTIVATE ||message == WM_NOTIFY)
 {
  CDC* pWinDC = GetWindowDC();
  if (pWinDC)
   DrawTitleBar(pWinDC);
  ReleaseDC(pWinDC);
 }
 return lrst;

}

void CMyDlg::OnNcPaint()
{
 //CDialog::OnNcPaint();
}

BOOL CMyDlg::OnEraseBkgnd(CDC* pDC)
{
  return TRUE;

}

void CMyDlg::ShowBitmap(CDC *pDC, int x, int y, int nW, int nH, CBitmap &m_bitmap)
{
 CDC memDc, mdc;

 memDc.CreateCompatibleDC(NULL);
 mdc.CreateCompatibleDC(NULL);

 CBitmap memBitmap;
 memBitmap.CreateCompatibleBitmap(pDC,nW,nH);
 CBitmap *OldBmp = memDc.SelectObject(&m_bitmap);
 
 mdc.SelectObject(&m_bitmap);
 memDc.BitBlt(x,y,nW,nH,&mdc,0,0,SRCCOPY);

 BITMAP bm;
 m_bitmap.GetBitmap( &bm );

 //贴图
 //pDC->BitBlt(x, y,
 // x + bm.bmWidth,y + bm.bmHeight,
 // &MemDc,
 // 0, 0,
 // SRCCOPY);

 //拉伸
 pDC->StretchBlt(x,y, nW, nH ,&memDc,0,0,
  bm.bmWidth,bm.bmHeight,SRCCOPY);

 memDc.SelectObject(OldBmp);
 memDc.DeleteDC();

}