(Tcl) DNS Query TXT Records

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Shows how to perform a DNS query to retrieve TXT records.

Note: This example requires Chilkat v9.5.0.96 or later.

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load ./chilkat.dll

set dns [new_CkDns]

set json [new_CkJsonObject]

CkJsonObject_put_EmitCompact $json 0

set success [CkDns_Query $dns "TXT" "x.com" $json]
if {$success == 0} then {
    puts [CkDns_lastErrorText $dns]
    delete_CkDns $dns
    delete_CkJsonObject $json
    exit
}

puts [CkJsonObject_emit $json]

# Sample response.
# Parsing code below..

# {
#   "answer": {
#     "txt": [
#       {
#         "name": "x.com",
#         "ttl": 300,
#         "text": "kkdl3qb3tcrmdhfsm803p67r0my0svs8"
#       },
#       {
#         "name": "x.com",
#         "ttl": 300,
#         "text": "v=spf1 ip4:199.16.156.128/26 ip4:199.59.150.64/26 include:_spf.google.com include:spf-008d0a01.pphosted.com -all"
#       },
#       {
#         "name": "x.com",
#         "ttl": 300,
#         "text": "google-site-verification=8yQmoVhQedzlt36RPeQP41ytrEFk9aHEnde_xm0626g"
#       },
#       {
#         "name": "x.com",
#         "ttl": 300,
#         "text": "google-site-verification=F6u9mGL--d2lbLljvH3b1UUgXtevQPdcamKr9c8914A"
#       }
#     ]
#   }
# }

# Use this online tool to generate parsing code from sample JSON: 
# Generate Parsing Code from JSON

set i 0
set count_i [CkJsonObject_SizeOfArray $json "answer.txt"]
while {$i < $count_i} {
    CkJsonObject_put_I $json $i
    set name [CkJsonObject_stringOf $json "answer.txt[i].name"]
    set ttl [CkJsonObject_IntOf $json "answer.txt[i].ttl"]
    set text [CkJsonObject_stringOf $json "answer.txt[i].text"]
    set i [expr $i + 1]
}

delete_CkDns $dns
delete_CkJsonObject $json