如何将客户区的某块区域保存为一幅位图？（急！）

Question

如何将客户区的某块区域保存为一幅位图，请高手指点，不胜感激！

Answer 1

http://search.csdn.net/Expert/topic/460/460729.xml?temp=.5991632

Answer 2

BOOL CEastDrawView::SaveDIB(CBitmap*pbitmap, CFile&file)
{
    CClientDC dc(this);
OnPrepareDC(&dc);
dc.SetWindowOrg(m_CenterPoint);
CDC*pViewDC=&dc;
    CEastDrawDoc* pDoc = GetDocument();
ASSERT_VALID(pDoc); CBitmap*Oldmap;
    CBitmap Bitmap;
CDC memDC;
    Bitmap.CreateCompatibleBitmap(pViewDC,this->GetTotalSize().cx,this->GetTotalSize().cy);
    memDC.CreateCompatibleDC(pViewDC);
    memDC.SetMapMode(pViewDC->GetMapMode());
Oldmap=memDC.SelectObject(&Bitmap);

memDC.SetWindowOrg(m_CenterPoint);
memDC.PatBlt(m_CenterPoint.x,m_CenterPoint.y,GetTotalSize().cx,GetTotalSize().cy,WHITENESS);

this->DrawAll(&memDC);
    if(this->m_HaveAxis)
this->DrawAxis(&memDC);
::GdiFlush();
memDC.SelectObject(Oldmap);
memDC.DeleteDC();

BITMAPFILEHEADER bmfHdr; 

    bmfHdr.bfType=0x4d42;
int sizeHdr=sizeof(BITMAPINFOHEADER);
   
    LPBITMAPINFOHEADER lpBI=( LPBITMAPINFOHEADER)::GlobalAlloc(LMEM_FIXED,sizeHdr);
  if(!lpBI)
{
  AfxMessageBox("内存申请失败，请稍后再试");

}
BYTE *pDib;
BYTE *pDib2;
    pDib=(BYTE*)::GlobalAlloc(LMEM_FIXED,GetTotalSize().cx*GetTotalSize().cy*4);
    if(!pDib)
{
  AfxMessageBox("内存申请失败，请稍后再试");

}
lpBI->biSize=(LONG)sizeof(BITMAPINFOHEADER);
lpBI->biWidth=(LONG)this->GetTotalSize().cx;
lpBI->biHeight=(LONG)this->GetTotalSize().cy;
lpBI->biPlanes=1;
lpBI->biBitCount=32;
lpBI->biCompression=BI_RGB;
lpBI->biSizeImage=0;
lpBI->biXPelsPerMeter=0;
lpBI->biYPelsPerMeter=0;
lpBI->biClrUsed=0;
lpBI->biClrImportant=0;   
    Bitmap.GetBitmapBits(GetTotalSize().cx*GetTotalSize().cy*4,pDib); pDib2=(BYTE*)::GlobalAlloc(LMEM_FIXED,GetTotalSize().cx*GetTotalSize().cy*4);
  if(!pDib2)
{
  AfxMessageBox("内存申请失败，请稍后再试");

}

for(int j=0;j<GetTotalSize().cy;j++)
 for(int i=0;i<GetTotalSize().cx*4;i++)
 {
  pDib2[i+j*GetTotalSize().cx*4]=pDib[GetTotalSize().cx*(GetTotalSize().cy-1-j)*4+i];
}
 ::GlobalFree(pDib);
    bmfHdr.bfSize=(DWORD) (sizeof(BITMAPFILEHEADER) + 
                 sizeHdr +GetTotalSize().cx*GetTotalSize().cy*4); 
bmfHdr.bfReserved1=bmfHdr.bfReserved2=0;
bmfHdr.bfOffBits=sizeof(BITMAPFILEHEADER)+sizeHdr;

  try
  {
 
     file.Write((LPVOID)&bmfHdr,sizeof(BITMAPFILEHEADER));
 file.Write((LPVOID)lpBI,sizeHdr);
 file.WriteHuge((LPVOID)pDib2,GetTotalSize().cx*GetTotalSize().cy*4);
  }  catch(CException*Fe)
  {
    Fe->ReportError();
Fe->Delete();
   return false;
  }
  
 
  ::GlobalFree(lpBI);
  ::GlobalFree(pDib2);
   return true;  
  }