VC++ Char * 保存成bmp和JPEG

void CXBlobMTooldlg::SaveJpgTest()
{
 int width = 999;
 int height = 1000;
 int band = 1;
 char * pImageData = Vision_GetHwnd(0, 0, 0, width, height);
 int stride = (width + 3) / 4 * 4;
 int rowSize = width * band;
 int strideSize = stride * band;
 char * pConvertData = new char[stride * height * band];
 char * pCopyData = pConvertData;
 pImageData += ((height - 1) * rowSize);
 for (int row = 0; row < height; row++)
 {
  memcpy(pCopyData, pImageData, rowSize);
  pCopyData += strideSize;
  pImageData -= rowSize;
 }
 
 BITMAPINFO * bmInfo = (BITMAPINFO*)malloc(sizeof(BITMAPINFO) + 256 * sizeof(RGBQUAD));
 bmInfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
 bmInfo->bmiHeader.biWidth = width;
 bmInfo->bmiHeader.biHeight = height;
 bmInfo->bmiHeader.biPlanes = 1;
 //bmInfo->bmiHeader.biBitCount = 8;//8位灰阶数据
 bmInfo->bmiHeader.biBitCount = band * 8;
 bmInfo->bmiHeader.biCompression = 0;//BI_RGB
 bmInfo->bmiHeader.biClrUsed = 0;//或256
 bmInfo->bmiHeader.biSizeImage = 0;
 bmInfo->bmiHeader.biXPelsPerMeter = 0;
 bmInfo->bmiHeader.biYPelsPerMeter = 0;
 bmInfo->bmiHeader.biClrImportant = 0;
 BITMAPINFOHEADER &bmInfohdr = (BITMAPINFOHEADER)bmInfo->bmiHeader;
 for (int i = 0; i<256; i++)
 {
  bmInfo->bmiColors[i].rgbRed = i;
  bmInfo->bmiColors[i].rgbGreen = i;
  bmInfo->bmiColors[i].rgbBlue = i;
 }
 HDC hDC = ::GetDC(0);
 HBITMAP hBmp = CreateDIBitmap(hDC,
  &bmInfohdr,
  CBM_INIT,
  pConvertData,
  bmInfo,
  DIB_RGB_COLORS);
 CImage   mmage;
 mmage.Attach(hBmp);
 int retval = mmage.Save("d:\123.jpg", Gdiplus::ImageFormatJPEG);
 delete[] pConvertData;
}

void  CXBlobMTooldlg::SaveBmp(const char *fileName, unsigned char *pImgData, int imgLength, int iWidth, int iHeight)
{
 BITMAPFILEHEADER targetfileheader;
 BITMAPINFOHEADER targetinfoheader;
 memset(&targetfileheader, 0, sizeof(BITMAPFILEHEADER));
 memset(&targetinfoheader, 0, sizeof(BITMAPINFOHEADER));

 //构造灰度图的文件头
 targetfileheader.bfOffBits = (DWORD)sizeof(BITMAPFILEHEADER) + (DWORD)sizeof(BITMAPINFOHEADER) + sizeof(RGBQUAD) * 256;
 targetfileheader.bfSize = 192 * 192 + sizeof(RGBQUAD) * 256 + sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
 targetfileheader.bfReserved1 = 0;
 targetfileheader.bfReserved2 = 0;
 targetfileheader.bfType = 0x4d42;

 //构造灰度图的信息头
 targetinfoheader.biBitCount = 8;
 targetinfoheader.biSize = sizeof(BITMAPINFOHEADER);
 targetinfoheader.biHeight = iHeight;
 targetinfoheader.biWidth = iWidth;
 targetinfoheader.biPlanes = 1;
 targetinfoheader.biCompression = BI_RGB;
 targetinfoheader.biSizeImage = 0;
 targetinfoheader.biXPelsPerMeter = 0;
 targetinfoheader.biYPelsPerMeter = 0;
 targetinfoheader.biClrImportant = 0;
 targetinfoheader.biClrUsed = 0;

 //构造灰度图的调色版
 RGBQUAD rgbquad[256];
 int i;
 for (i = 0; i<256; i++)
 {
  rgbquad[i].rgbBlue = i;
  rgbquad[i].rgbGreen = i;
  rgbquad[i].rgbRed = i;
  rgbquad[i].rgbReserved = 0;
 }
 
 BYTE* ptargetData;
 ptargetData = new BYTE[iWidth*iHeight];
 //由于BMP图像对于行是倒置的，即图像显示的第一行是最后一行数据，所以要倒置，这里的pcutface已经////是灰度图像了
 for (long i = iHeight -1; i >= 0; i--)
 {
  for (long j = 0; j<iWidth; j++)
  {
   ptargetData[i * iWidth + j] = pImgData[(iHeight-1 - i) * iWidth + j];
  }
 }
 CFile file;
 if (file.Open(fileName, CFile::modeCreate | CFile::modeWrite))
 {
  file.Write(&targetfileheader, sizeof(BITMAPFILEHEADER));
  file.Write(&targetinfoheader, sizeof(BITMAPINFOHEADER));
  file.Write(&rgbquad, sizeof(RGBQUAD) * 256);
  file.Write(ptargetData, iWidth*iHeight);   //这里targetbuf的大小为192x192
  file.Close();
  delete ptargetData;
  ptargetData = NULL;
 }
}