TinyXML2에서 검색 키워드로 속성을 사용하는 방법 (C++)

Question

키워드를 사용하여 원하는 요소를 찾으려고합니다. 첫 번째 요소 인 경우에만 작동 할 수 있습니다.

bool readXML(){ 
string gateWay_str="",user_Input=""; 
XMLDocument XML_file; 
XML_file.LoadFile("exception_ip.xml");      //XML file Name 
XMLHandle docHandle(&XML_file);       //XMLHandle 
XMLNode* node_ctrl;           //Node pointer 
XMLElement* gateWay_Ele = docHandle.FirstChildElement("exception_ip").FirstChildElement("ip").ToElement(); //Get Node by XMLHandle and turn to Element 
cout<<"Test ip3=";           //show to user 
cin>>user_Input;           //user input 

if(gateWay_Ele){           //is gateWay_Ele null? 
    gateWay_str=gateWay_Ele->Name();      //get Element name and show 
    cout<< "Got gateWay_Ele = "<<gateWay_str<<endl; 
} 
if(gateWay_Ele ->Attribute("ip3",(user_Input.c_str()))){ //find Attribute where ip3 = "user input" 
     node_ctrl=gateWay_Ele->FirstChild();    //make node_ctrl point FirstChild 
     if(node_ctrl==nullptr){        //is nullptr? 
      cout<<"node_ctrl = nullptr"; 
      return false; 
     } 
     else{            
      gateWay_Ele=node_ctrl->ToElement();    //turn node_ctel to Element 
      gateWay_str = gateWay_Ele->GetText();   //get Text 
      cout<<"GateWay = "<<gateWay_str<<endl;   //show 
      return true;         //return true 
     } 
    } 
return false; 

}

내 XML 입력 23

내가 사용 NextSiblingElement ("IP"를 시도했을 때

<?xml version="1.0" ?> 
 
<exception_ip> 
 
\t <ip ip3="23"> \t 
 
     <gateway>123.123.23.1</gateway> 
 
     <dnsp>dnsp23</dnsp> 
 
     <dnss>dnss23</dnss> 
 
\t </ip> 
 
\t <ip ip3="24"> \t 
 
     <gateway>123.123.24.1</gateway> 
 
     <dnsp>dnsp24</dnsp> 
 
     <dnss>dnss24</dnss> 
 
\t </ip> 
 
</exception_ip>

그것은 단지 일이다) 포인트 유지하기 g에서 다음 형제 요소로 이동합니다. 하지만 그냥 무한 루프

do{ 
if(gateWay_Ele ->Attribute("ip3",(user_Input.c_str()))){ //find Attribute where ip3 = "user input" 
     node_ctrl=gateWay_Ele->FirstChild();    //make node_ctrl point FirstChild 
     if(node_ctrl==nullptr){        //is nullptr? 
      cout<<"node_ctrl = nullptr"; 
      return false; 
     } 
     else{            
      gateWay_Ele=node_ctrl->ToElement();    //turn node_ctel to Element 
      gateWay_str = gateWay_Ele->GetText();   //get Text 
      cout<<"GateWay = "<<gateWay_str<<endl;   //show 
      return true;         //return true 
     } 
    } 
else{ 
    gateWay_Ele->NextSiblingElement("ip"); 
} 
}while(true); 

감사합니다!

Answer 1

원하는 "ip3"속성을 테스트 할 때까지 모든 "ip"요소를 반복해야합니다. 그러나 여기 my tinyxml2 extension를 사용하여 그것을 할 수있는 쉬운 방법입니다 :

#include <string> 
#include <iostream> 
#include <conio.h> // for _getch() 
// include the header for tinyxml2ex which includes tinyxml2, remember to put them on your include path 
#include "tixml2ex.h" 

using namespace std; 

int main() 
{ 
    // put the XML into a string for simplicity 
    string testXml{ R"-(
<?xml version="1.0" ?> 
<exception_ip> 
    <ip ip3="23"> 
     <gateway>123.123.23.1</gateway> 
     <dnsp>dnsp23</dnsp> 
     <dnss>dnss23</dnss> 
    </ip> 
    <ip ip3="24"> 
     <gateway>123.123.24.1</gateway> 
     <dnsp>dnsp24</dnsp> 
     <dnss>dnss24</dnss> 
    </ip> 
</exception_ip> 
)-"s }; 

    auto doc = tinyxml2::load_document (testXml); 
    // find the required element by XPath and list its member elements 
    if (auto ip = find_element (*doc, "/exception_ip/ip[@ip3='24']"s)) 
    { 
     for (auto e : ip) 
      cout << e->Name() << " " << text (e) << endl; 
    } 
    else 
     cout << "could not find ip element" << endl; 

    return 0; 
} 

Answer 2

나는 다른 방법으로 모든 요소를 ​​반복하고 작동합니다.

bool readXML(){ 
    string gateway_str="",user_Input="",dnsp_str="",dnss_str=""; 
    XMLDocument XML_file; 
    if(XML_file.LoadFile("exception_ip.xml")){ 
     cout<<"Can't find exception_ip.xml"<<endl; 
     return false;                 //XML file Name 
    } 
    XMLHandle docHandle(&XML_file);                  //XMLHandle 
    XMLNode* node_ctrl = docHandle.FirstChildElement("exception_ip").FirstChildElement("ip").ToNode(); 
    XMLElement* element_main = node_ctrl->ToElement(); 

    cout<<"Test ip3=";           //show to user 
    cin>>user_Input;           //user input 


    if(element_main){           //do if element_main not null 
     do{ 
      element_main = node_ctrl ->ToElement();    //let node turn to element 

      if(element_main ->Attribute("ip3",(user_Input.c_str()))) //if Attribute is what we wnat? 
      { 
       element_main = element_main ->FirstChildElement();  //make element to child 

       gateway_str = element_main ->GetText();       //get test put into str 

       element_main = element_main->NextSiblingElement(); 

       dnsp_str = element_main->GetText(); 

       element_main = element_main->NextSiblingElement(); 

       dnss_str = element_main->GetText(); 


       cout<<"ip3="<<user_Input<<endl<<"GW= "<<gateway_str<<endl<<"DNS1= "<<dnsp_str<<endl<<"DNS2= "<<dnss_str<<endl;    //output 
       return true;           //return 1 
      } 
      else{              //if Attribute not match 
       if(node_ctrl=element_main ->NextSibling()){}   //make pointer to next element (Sibling) 
       else{ 
        cout<<"Can't find "<<user_Input<<endl;    //Can't find what we want QQ 
        return false;          //bye 
       } 
      } 

     }while(true); 
    } 
    return false;              //total fail -file can't found? 
}