C++提取html中的文本

char* HtmlUtil::readFile(std::string& file_name){
    std::ifstream file(file_name);
    file.seekg(0, std::ios::end);
    int fileLength = file.tellg();

    file.seekg(0, std::ios::beg);

    char* buffer = new char[fileLength + 1];
    file.read(buffer, fileLength);
    buffer[fileLength] = '\0';
    return buffer;
}

std::vector<std::string> HtmlUtil::getCppSource(std::string& file_name){
  CDocument doc;
  doc.parse(HtmlUtil::readFile(file_name));

  CSelection c = doc.find(".source-cpp pre.de1, .source-text pre.de1");
  int size = c.nodeNum();
  std::vector<std::string> ret ;
  for(int i = 0;i<size;i++){
      ret.push_back(c.nodeAt(i).text());
  }
  return ret;
}