Visual FoxPro

DNS Query CAA Records

See more DNS Examples

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

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

Visual FoxPro

LOCAL lnSuccess
LOCAL loDns
LOCAL loJson
LOCAL lcName
LOCAL lnTtl
LOCAL lnFlags
LOCAL lcTag
LOCAL lcValue
LOCAL i
LOCAL lnCount_i

lnSuccess = 0

loDns = CreateObject('Chilkat.Dns')

loJson = CreateObject('Chilkat.JsonObject')
loJson.EmitCompact = 0

lnSuccess = loDns.Query("CAA","zoom.us",loJson)
IF (lnSuccess = 0) THEN
    ? loDns.LastErrorText
    RELEASE loDns
    RELEASE loJson
    CANCEL
ENDIF

? loJson.Emit()

*  Sample response.
*  Parsing code below..

*  {
*    "answer": {
*      "caa": [
*        {
*          "name": "zoom.us",
*          "ttl": 300,
*          "flags": 0,
*          "tag": "iodef",
*          "value": "mailto:security@zoom.us"
*        },
*        {
*          "name": "zoom.us",
*          "ttl": 300,
*          "flags": 0,
*          "tag": "issue",
*          "value": "amazon.com"
*        },
*        {
*          "name": "zoom.us",
*          "ttl": 300,
*          "flags": 0,
*          "tag": "issue",
*          "value": "digicert.com"
*        },
*        {
*          "name": "zoom.us",
*          "ttl": 300,
*          "flags": 0,
*          "tag": "issue",
*          "value": "godaddy.com"
*        },
*        {
*          "name": "zoom.us",
*          "ttl": 300,
*          "flags": 0,
*          "tag": "issue",
*          "value": "letsencrypt.org"
*        },
*        {
*          "name": "zoom.us",
*          "ttl": 300,
*          "flags": 0,
*          "tag": "issue",
*          "value": "pki.goog"
*        },
*        {
*          "name": "zoom.us",
*          "ttl": 300,
*          "flags": 0,
*          "tag": "issue",
*          "value": "sectigo.com"
*        }
*      ]
*    }
*  }

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

i = 0
lnCount_i = loJson.SizeOfArray("answer.caa")
DO WHILE i < lnCount_i
    loJson.I = i
    lcName = loJson.StringOf("answer.caa[i].name")
    lnTtl = loJson.IntOf("answer.caa[i].ttl")
    lnFlags = loJson.IntOf("answer.caa[i].flags")
    lcTag = loJson.StringOf("answer.caa[i].tag")
    lcValue = loJson.StringOf("answer.caa[i].value")
    i = i + 1
ENDDO

RELEASE loDns
RELEASE loJson