Código Escaner de puertos en C++

[Drewermerc]

hola principe_azul.
bueno al igual que tu no lelvo mucho con esto de los sockets pero mira ya pude correr tu codigo espero que esto te ayude.

Código C:

#include <winsock2.h>
    #include <windows.h>     
    #include <iostream>
#pragma comment(lib, "Ws2_32.lib")
using namespace std;
 
char IP[20];
int startPort, endPort, err, nret;
 
 
 
int main()
{
    struct sockaddr_in conect;
    SOCKET iSocket;
    SOCKADDR_IN Info;
    WSADATA wsaData;
     if (WSAStartup(MAKEWORD(2,0), &wsaData) != 0 )
   {
      cout << "Winsock Error, Exiting..." << endl;
      cin.get();
      return 0;
   }
 
   cout << "Target IP: ";
   cin>>IP;
   cout << "Starting Port: ";
   cin>>startPort;
   cout << "End Port: ";
   cin>>endPort;
 
   cin.ignore();
 
   cout << endl << endl << "Scanning..." << endl << endl;
 
   for(int i=startPort; i < endPort; i++)
   {
      //iSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
      iSocket = socket(AF_INET, SOCK_STREAM, 0);
 
      Info.sin_family = AF_INET;
      Info.sin_port = htons(startPort);
      nret = connect(iSocket, (struct sockaddr *)&conect, sizeof(struct sockaddr));
      // error is for line above
      if(nret != SOCKET_ERROR)
      {
         cout << "Port " << i << " - OPEN! " << endl;
      }
      //temp++;
      closesocket(iSocket);
    }
    cout << endl << "Finished With Scan..." << endl;
 
    cin.get();
    WSACleanup();
}
 

saludos.