Split URL into Host, Port and Resource - C++

Question

I need to split the URL into host, port and resource. I searched a lot of references but couldn't find anything that could help me. This is how I want:

eg: url is - 1.2.3.4:5678/path1/path2.html Necessary output is: Host - 1.2.3.4, Port - 5678, Resource - /path1/path2.html

This is how I tired:

#include <iostream>
 #include <cstddef>
 #include <string>
 using namespace std;

int main()
{
   string url="http://qwert.mjgug.ouhnbg:5678/path1/path2.html";
   size_t found = url.find_first_of("://");
   cout<<found<<endl;
   string protocol=url.substr(0,found);
   size_t found1 =url.find_first_of(":");
   cout<<found1<<endl;
   string host =url.substr(found+3,found1-found+1);
   size_t found2 = url.find_first_of(":/");
   string port1 =url.substr(found1+7,found2+found1-1);
   string port =url.substr(found2+1);
   cout<<protocol<<endl;
   cout<<host<<endl;
   cout<<port1<<endl;
   cout<<port;
   return 0;
}

My expected result is:

Protocol - http
Host - qwert.mjgug.ouhnbg
Port - 5678
Resource - path1/path2.html

But my result is:

http:                                                                                                                                                  
qwert.mj                                                                                                                                               
t.mjgug                                                                                                                                                
//qwert.mjgug.ouhnbg:5678/path1/path2.html

What should I change?

Answer 1

Use string.first_find_of(":") to get the index of first occurrence of any char and use string.substr(pos,len) to get the substring starting at index pos and length=len;

 #include <iostream>
 #include <cstddef>
 #include <string>
 using namespace std;

int main()
{
   string url="1.2.3.4:5678/path1/path2.html";
   size_t found = url.find_first_of(":");
   string host=url.substr(0,found);
   size_t found1 =url.find_first_of("/");
   string port =url.substr(found+1,found1-found-1);
   string resource =url.substr(found1);
   cout<<host<<endl;
   cout<<port<<endl;
   cout<<resource;
   return 0;
}

With http or https in url

int main()
{
  string url="http://qwert.mjgug.ouhnbg:5678/path1/path2.html";
  size_t found = url.find_first_of(":");
  string protocol=url.substr(0,found); 

 string url_new=url.substr(found+3); //url_new is the url excluding the http part
 size_t found1 =url_new.find_first_of(":");
 string host =url_new.substr(0,found1);

 size_t found2 = url_new.find_first_of("/");
 string port =url_new.substr(found1+1,found2-found1-1);
 string path =url_new.substr(found2);

  cout<<protocol<<endl;
 cout<<host<<endl;
 cout<<port<<endl;
 cout<<path;
 return 0;
 }