在WinCE下拷屏并保存为BMP图片

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在WinCE下拷屏并保存为BMP图片

2011-01-12 15:32:40| 分类：默认分类 | 标签： |字号大中小订阅

前几天要写一段在Windows CE 下拷屏的程序，但是CE不支持GetDIBits这个API，这可难坏了我，在网上查了半天资料，最后用CreateDIBSection搞定，现封装成一个函数SaveDCToBMP，方便大家使用。

void SaveDCToBMP(HDC hDC,int nStartX,int nStartY,
      int nWidth,int nHeight,LPCTSTR szFileName)
{
 //定义图形色深
 int iPixel = 32; //根据具体可赋值24

//位图信息头
 LPBITMAPINFO lpbmih = new BITMAPINFO;
 lpbmih->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
 lpbmih->bmiHeader.biWidth = nWidth;
 lpbmih->bmiHeader.biHeight = nHeight;
 lpbmih->bmiHeader.biPlanes = 1;
 lpbmih->bmiHeader.biBitCount = iPixel;
 lpbmih->bmiHeader.biCompression = BI_RGB;
 lpbmih->bmiHeader.biSizeImage = 0;
 lpbmih->bmiHeader.biXPelsPerMeter = 0;
 lpbmih->bmiHeader.biYPelsPerMeter = 0;
 lpbmih->bmiHeader.biClrUsed = 0;
 lpbmih->bmiHeader.biClrImportant = 0;

 //创建位图数据
 HDC hdcMem;
 HBITMAP hBitMap = NULL;
 CBitmap *pBitMap = NULL;
 CDC *pMemDC = NULL;
 BYTE *pBits;

 hdcMem = CreateCompatibleDC(hDC);
 hBitMap = CreateDIBSection(hdcMem,lpbmih,DIB_PAL_COLORS,(void **)&pBits,NULL,0);
 pBitMap = new CBitmap;
 pBitMap->Attach(hBitMap);
 pMemDC = new CDC;
 pMemDC->Attach(hdcMem);
 pMemDC->SelectObject(pBitMap);
pMemDC->BitBlt(0,0,nWidth,nHeight,CDC::FromHandle(hDC),nStartX,nStartY,SRCCOPY);

 BITMAPFILEHEADER bmfh;//位图文件头
 ZeroMemory(&bmfh,sizeof(BITMAPFILEHEADER));
 *((char *)&bmfh.bfType) = 'B';
 *(((char *)&bmfh.bfType) + 1) = 'M';
 bmfh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
 bmfh.bfSize = bmfh.bfOffBits + (nWidth * nHeight) * iPixel / 8;

 int iBMPBytes = nWidth * nHeight * iPixel / 8;
 CFile file;
 if(file.Open(szFileName,CFile::modeWrite | CFile::modeCreate))
 {
   file.Write(&bmfh,sizeof(BITMAPFILEHEADER));
   file.Write(&(lpbmih->bmiHeader),sizeof(BITMAPINFOHEADER));
   file.Write(pBits,iBMPBytes);
   file.Close();
 }
DeleteObject(hBitMap);
 DeleteObject(hDC);
 pMemDC->DeleteDC();
 delete pMemDC; pMemDC = NULL;
 delete pBitMap; pBitMap = NULL;
 delete lpbmih; lpbmih = NULL