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(Unicode C++) DNS Query MX RecordsSee more DNS ExamplesShows how to perform a DNS query to retrieve MX records. Note: This example requires Chilkat v9.5.0.96 or later.
#include <CkDnsW.h> #include <CkJsonObjectW.h> void ChilkatSample(void) { CkDnsW dns; CkJsonObjectW json; json.put_EmitCompact(false); bool success = dns.Query(L"MX",L"somebody@gmail.com",json); if (success == false) { wprintf(L"%s\n",dns.lastErrorText()); return; } wprintf(L"%s\n",json.emit()); // Sample response. // Parsing code below.. // ------------------------------------------------------------------------------- // Note: Chilkat will return the results sorted by "pref" from lowest to highest. // ------------------------------------------------------------------------------- // { // "answer": { // "mx": [ // { // "name": "gmail.com", // "ttl": 491, // "pref": 5, // "domain": "gmail-smtp-in.l.google.com" // }, // { // "name": "gmail.com", // "ttl": 491, // "pref": 10, // "domain": "alt1.gmail-smtp-in.l.google.com" // }, // { // "name": "gmail.com", // "ttl": 491, // "pref": 20, // "domain": "alt2.gmail-smtp-in.l.google.com" // }, // { // "name": "gmail.com", // "ttl": 491, // "pref": 30, // "domain": "alt3.gmail-smtp-in.l.google.com" // }, // { // "name": "gmail.com", // "ttl": 491, // "pref": 40, // "domain": "alt4.gmail-smtp-in.l.google.com" // } // ] // } // } // Use this online tool to generate parsing code from sample JSON: // Generate Parsing Code from JSON const wchar_t *name = 0; int ttl; int pref; const wchar_t *domain = 0; int i = 0; int count_i = json.SizeOfArray(L"answer.mx"); while (i < count_i) { json.put_I(i); name = json.stringOf(L"answer.mx[i].name"); ttl = json.IntOf(L"answer.mx[i].ttl"); pref = json.IntOf(L"answer.mx[i].pref"); domain = json.stringOf(L"answer.mx[i].domain"); i = i + 1; } } |
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