How to do SRV and TXT query with windns.h

win_dnssd.cpp

/**
 * Compiled on VS2012
 */
#include <winsock2.h>  //winsock
#include <windns.h>   //DNS api's
#include <Rpc.h>
#include <iostream>
#include <functional>
#include <map>

using namespace std;

#pragma comment(lib, "Ws2_32.lib")
#pragma comment(lib, "Dnsapi.lib")

int main(int argc, char *argv[]) {
    if (argc < 3) {
        cerr << "Usage: " << argv[0] << " [SRV|TXT] [service]" << endl;
        return 1;
    }

    PDNS_RECORD pDnsRecord;          //Pointer to DNS_RECORD structure.

    {
        WORD type;
        if (!strcmp(argv[1], "SRV")) {
            type= DNS_TYPE_SRV;
        } else if (!strcmp(argv[1], "TXT")) {
            type= DNS_TYPE_TEXT;
        } else {
            cerr << "Invalid argument: '" << argv[1] << "'. Must be [SRV|TXT]" << endl;
            return 1;
        }

        if (DnsQuery_A(argv[2], type, DNS_QUERY_BYPASS_CACHE, NULL, &pDnsRecord, NULL)) {
            cerr << "Error querying: '" << argv[2] << "'" << endl;
            return 2;
        }
    }

    PDNS_RECORD it;
    map<WORD, function<void (void)>> callbacks;
    callbacks[DNS_TYPE_SRV]= [&it](void) -> void {
        cout << it->dwTtl << endl;
        cout << it->Data.SRV.wPriority << endl;
        cout << it->Data.SRV.wWeight << endl;
        cout << it->Data.SRV.wPort << endl;
        cout << RPC_CSTR(it->Data.SRV.pNameTarget) << endl;
    };
    callbacks[DNS_TYPE_TEXT]= [&it](void) -> void {
        for(DWORD i= 0; i < it->Data.TXT.dwStringCount; i++) {
            cout << RPC_CSTR(it->Data.TXT.pStringArray[i]) << endl;;
        }
    };
    
    for(it= pDnsRecord; it != NULL; it= it->pNext) {
        if (callbacks.count(it->wType)) {
            callbacks[it->wType]();
        }
    }
    DnsRecordListFree(pDnsRecord, DnsFreeRecordListDeep);

    return 0;
}