c++ - 如何从一个字符串中提取多个子字符串？

Question

我原来的字符串看起来像这个<Information name="Identify" id="IdentifyButton" type="button"/>从此字符串中，如何提取3个子字符串string name_part = Identify，string id_part="IdentifyButton"和type_part="button"

Answer 1

假设您不想使用第三方XML解析器，则可以对每个名称使用std::string的find():

int main()
{
  std::string s("<Information name = \"Identify\" id = \"IdentifyButton\" type = \"button\" / >");
  std::string names[] = { "name = \"" , "id = \"" , "type = \"" };
  std::string::size_type posStart(0), posEnd(0);
  for (auto& n : names)
  {
    posStart = s.find(n, posEnd) + n.length();
    posEnd = s.find("\"", posStart);
    std::string part = s.substr(posStart, posEnd - posStart);
    std::cout << part << std::endl;
    posEnd++;
  }
}

根据您的容忍度添加错误检查:)