建立bmp图片将设备上下文中的内容保存成位图文。

时间：2010-08-12 来源：thanklife

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;

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