建立bmp图片将设备上下文中的内容保存成位图文。

这段内容是添加到单文档的应用程序的 视图类的OnDraw方法中的，将设备上下文中的内容保存成位图文件。 

pDC->TextOut(100, 30,"弃我去者，昨日之日不可留；乱我心者，");
 pDC->TextOut(60, 50,"今日之日多烦扰。长空万里送秋雁，对此可以");
 pDC->TextOut(60, 70,"酣高楼。蓬莱文章建安骨，中间小谢又青发。");
 pDC->TextOut(60, 90,"具怀逸兴壮思飞，欲上青天揽明月。抽刀断水");
 pDC->TextOut(60,110,"水更流，举杯消愁愁更愁。人生在世不称意，");
 pDC->TextOut(60,130,"明朝散发弄扁舟。");

 CBitmap bmp;
 bmp.CreateCompatibleBitmap(pDC,400,200);
 CDC memDC;
 memDC.CreateCompatibleDC(pDC);
 memDC.SelectObject(&bmp);
 memDC.BitBlt(0,0,400,200,pDC,0,0,SRCCOPY);

 BITMAP bInfo;
 bmp.GetBitmap(&bInfo);
 int szPanel = 0;
 if (bInfo.bmBitsPixel<16)
  szPanel = pow(2,bInfo.bmBitsPixel)*sizeof(RGBQUAD);
 BITMAPINFO* pBitInfo = (BITMAPINFO*) LocalAlloc(LPTR,sizeof(BITMAPINFO)+szPanel);
 pBitInfo->bmiHeader.biBitCount = bInfo.bmBitsPixel;
 pBitInfo->bmiHeader.biClrImportant = 0;
 pBitInfo->bmiHeader.biCompression = 0;
 pBitInfo->bmiHeader.biHeight = bInfo.bmHeight;
 pBitInfo->bmiHeader.biPlanes = bInfo.bmPlanes;
 pBitInfo->bmiHeader.biSize = sizeof(BITMAPINFO);
 pBitInfo->bmiHeader.biSizeImage = bInfo.bmWidthBytes* bInfo.bmHeight;
 pBitInfo->bmiHeader.biWidth = bInfo.bmWidth;
 pBitInfo->bmiHeader.biXPelsPerMeter = 0;
 pBitInfo->bmiHeader.biYPelsPerMeter = 0;

 char* pData = new char[bInfo.bmWidthBytes*bInfo.bmHeight];
 GetDIBits(memDC.m_hDC,bmp,0,bInfo.bmHeight,pData,pBitInfo,DIB_RGB_COLORS);

 BITMAPFILEHEADER FileHeader;
 FileHeader.bfType = 0x4d42; //BM
 FileHeader.bfReserved1 = 0;
 FileHeader.bfReserved2 = 0;
 FileHeader.bfSize = sizeof(BITMAPFILEHEADER);
 FileHeader.bfOffBits = sizeof(BITMAPFILEHEADER)+sizeof(BITMAPINFO)+szPanel;

 CFile file;
 file.Open("E:\\bmp.bmp",CFile::modeCreate|CFile::modeReadWrite);
 file.WriteHuge(&FileHeader,sizeof(BITMAPFILEHEADER));
 file.WriteHuge(pBitInfo,sizeof(BITMAPINFO));
 file.WriteHuge(pData,bInfo.bmWidthBytes*bInfo.bmHeight);
 file.Close();

 LocalFree(pBitInfo);
 delete pData;