Winsock programming interface experiment: implementation of ipconfig

Rewrite the code in the book , Use C++
《Windows Network programming （ The first 2 edition ）》

#define _WINSOCK_DEPRECATED_NO_WARNINGS

#include <winsock2.h>
#include<iphlpapi.h>
#pragma comment(lib, "Ws2_32.lib")
#pragma comment(lib,"iphlpapi.lib")

#include<iostream>
#include<sstream>

using namespace std;

void getInfo()
{
    
	//  Specify the pointer of the obtained network information structure linked list 
	IP_ADAPTER_INFO* pAdapterInfo;
	//  Save the length of the linked list of the obtained network information structure 
	ULONG  ulOutBufLen;
	//  Return call code 
	DWORD dwRetVal;
	//  A single structure variable used to round through all network adapter information 
	PIP_ADAPTER_INFO pAdapter;

	//  by pAdapterInfo Allocate space 
	pAdapterInfo = NULL;//(IP_ADAPTER_INFO *)malloc(sizeof(IP_ADAPTER_INFO));
	ulOutBufLen = 0;//sizeof(IP_ADAPTER_INFO);

	// Get network card information 
	//  The first 1 Secondary call GetAdaptersInfo(), Get the size of the returned result to ulOutBufLen in , The length of the linked list of network information structure 
	if (GetAdaptersInfo(pAdapterInfo, &ulOutBufLen) == ERROR_BUFFER_OVERFLOW)
	{
    
		pAdapterInfo = new IP_ADAPTER_INFO[ulOutBufLen];
	}
	//  The first 2 Secondary call GetAdaptersInfo(), Get the local network information to the structure pAdapterInfo in 
	if ((dwRetVal = GetAdaptersInfo(pAdapterInfo, &ulOutBufLen)) != ERROR_SUCCESS)
	{
    
		cout<<"GetAdaptersInfo Error! :"<< dwRetVal<<endl;
	}
	//  from pAdapterInfo  Get and display local network information 
	pAdapter = pAdapterInfo;
	while (pAdapter)
	{
    
		cout << endl;
		cout << " Network adapter name ：\t" << pAdapter->AdapterName << endl;
		cout << "\n  Network adapter description ：\t" << pAdapter->Description << endl;
		printf(" MAC Address : \t\t");
		for (unsigned int i = 0; i < pAdapter->AddressLength; i++)
		{
    
			if (i == (pAdapter->AddressLength - 1))
				printf("%.2X\n", (int)pAdapter->Address[i]);
			else
				printf("%.2X-", (int)pAdapter->Address[i]);
		}
		printf(" IP Address : \t\t%s\n", pAdapter->IpAddressList.IpAddress.String);
		printf("  Subnet mask : \t\t%s\n", pAdapter->IpAddressList.IpMask.String);
		printf("  gateway : \t\t%s\n", pAdapter->GatewayList.IpAddress.String);

		if (pAdapter->DhcpEnabled)
		{
    
			printf("  Enable DHCP: \t\t yes \n");
			printf(" DHCP The server : \t\t%s\n", pAdapter->DhcpServer.IpAddress.String);
		}
		else
		{
    
			printf("  Enable DHCP: \t\t no \n");
		}
		
		//  Handle next person network adapter 
		pAdapter = pAdapter->Next;
	}
	//  Release resources 
	if (pAdapterInfo)
		delete pAdapter;

	cout << endl;
}

int main()
{
    
	getInfo();
	
	return 0;
}