需要在標題欄上貼圖，更換標題欄背景的時候，不想要標題欄顯示顏色，尤其拉動改變窗體大小的時候，所以需要禁止標題欄重繪的方法。

只需要 處理WM_NCPAINT訊息就好了，訊息處理函式OnNcPaint中去掉CDialog::OnNcPaint()，從此世界安靜了

標題欄更換顏色，標題欄貼圖，窗體其他位置貼圖也可以用這裡的貼圖函式

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

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

 //獲取標題欄大小
 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);

 //背景顏色
 memDC.FillSolidRect(0,0,point.x,point.y,RGB(125,0,125));

 ////貼圖
 //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 );

 //貼圖
 //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();

}