C++ save base64-encoded image as file

gistfile1.txt

  
void SaveSnapshot(const std::string& base64_encoded_image) {
  std::vector<BYTE> buffer(base64_encoded_image.size());
  int len = buffer.size();
  ::Base64Decode(base64_encoded_image.c_str(),
                 base64_encoded_image.size(),
                 &buffer[0],
                 &len);
  HGLOBAL hMem = ::GlobalAlloc(GMEM_MOVEABLE, len);
  LPVOID pImage = ::GlobalLock(hMem);
  memcpy(pImage, &buffer[0], len);

  IStream* pStream = NULL;
  ::CreateStreamOnHGlobal(hMem, FALSE, &pStream);

  CImage image;
  image.Load(pStream);
  image.Save(L"testshot.png",
             Gdiplus::ImageFormatPNG);

  pStream->Release();
  GlobalUnlock(hMem);
  GlobalFree(hMem);
}