Tcl

Resolve Domain to IP Address

See more DNS Examples

Demonstrates how to perform a DNS query to obtain A records for resolving a domain name to an IPv4 address. Tcl

load ./chilkat.dll

set success 0

set dns [new_CkDns]

set json [new_CkJsonObject]

CkJsonObject_put_EmitCompact $json 0

set success [CkDns_Query $dns "A" "microsoft.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": {
#     "a": [
#       {
#         "name": "microsoft.com",
#         "ttl": 1528,
#         "ipv4": "20.112.250.133"
#       },
#       {
#         "name": "microsoft.com",
#         "ttl": 1528,
#         "ipv4": "20.231.239.246"
#       },
#       {
#         "name": "microsoft.com",
#         "ttl": 1528,
#         "ipv4": "20.76.201.171"
#       },
#       {
#         "name": "microsoft.com",
#         "ttl": 1528,
#         "ipv4": "20.70.246.20"
#       },
#       {
#         "name": "microsoft.com",
#         "ttl": 1528,
#         "ipv4": "20.236.44.162"
#       }
#     ]
#   }
# }

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

set i 0
set count_i [CkJsonObject_SizeOfArray $json "answer.a"]
while {$i < $count_i} {
    CkJsonObject_put_I $json $i
    set name [CkJsonObject_stringOf $json "answer.a[i].name"]
    set ttl [CkJsonObject_IntOf $json "answer.a[i].ttl"]
    set ipv4 [CkJsonObject_stringOf $json "answer.a[i].ipv4"]
    set i [expr $i + 1]
}

delete_CkDns $dns
delete_CkJsonObject $json