(Visual FoxPro) DNS Query A Records

See more DNS Examples

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

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

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LOCAL loDns
LOCAL loJson
LOCAL lnSuccess
LOCAL lcName
LOCAL lnTtl
LOCAL lcIpv4
LOCAL i
LOCAL lnCount_i

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Dns')
loDns = CreateObject('Chilkat.Dns')

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJson = CreateObject('Chilkat.JsonObject')
loJson.EmitCompact = 0

lnSuccess = loDns.Query("A","microsoft.com",loJson)
IF (lnSuccess = 0) THEN
    ? loDns.LastErrorText
    RELEASE loDns
    RELEASE loJson
    CANCEL
ENDIF

? loJson.Emit()

* 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

i = 0
lnCount_i = loJson.SizeOfArray("answer.a")
DO WHILE i < lnCount_i
    loJson.I = i
    lcName = loJson.StringOf("answer.a[i].name")
    lnTtl = loJson.IntOf("answer.a[i].ttl")
    lcIpv4 = loJson.StringOf("answer.a[i].ipv4")
    i = i + 1
ENDDO

RELEASE loDns
RELEASE loJson