PureBasic

Send JSON REST Request, Get JSON Response

See more REST Examples

Demonstrates sending a RESTful JSON request, and receiving a JSON response. This example will create a bucket in Google Cloud Storage (which involves sending and receiving JSON). PureBasic

IncludeFile "CkAuthGoogle.pb"
IncludeFile "CkRest.pb"
IncludeFile "CkJsonObject.pb"

Procedure ChilkatExample()

    success.i = 0

    ; This example will create a bucket in Google Cloud Storage.

    ; It requires the Chilkat API to have been previously unlocked.
    ; See Global Unlock Sample for sample code.

    gAuth.i = CkAuthGoogle::ckCreate()
    If gAuth.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Obtain an access token as shown in one of the following examples:
    ; See Get Access Token using a Service Account JSON Key
    ; See Get Access Token using a P12 File

    rest.i = CkRest::ckCreate()
    If rest.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Connect using TLS.
    bAutoReconnect.i = 1
    success = CkRest::ckConnect(rest,"www.googleapis.com",443,1,bAutoReconnect)

    ; Provide the authentication credentials (i.e. the access key)
    success = CkRest::ckSetAuthGoogle(rest,gAuth)

    ; Build the JSON request body for creating a bucket.
    ; The only required property is the "name", but we'll add more
    ; to make a better example..
    jsonReqBody.i = CkJsonObject::ckCreate()
    If jsonReqBody.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckAppendString(jsonReqBody,"name","chilkat-bucket-c")
    CkJsonObject::ckAppendString(jsonReqBody,"kind","storage#bucket")
    CkJsonObject::ckAppendString(jsonReqBody,"location","US")

    objVersioning.i = CkJsonObject::ckCreate()
    If objVersioning.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckAppendObject2(jsonReqBody,"versioning",objVersioning)
    CkJsonObject::ckAppendBool(objVersioning,"enabled",1)

    ; Show the HTTP request body we'll be sending.
    Debug CkJsonObject::ckEmit(jsonReqBody)

    ; Add the required query parameter.
    ; See https://cloud.google.com/storage/docs/json_api/v1/buckets/insert
    success = CkRest::ckAddQueryParam(rest,"project","chilkattest-1050")

    ; Add the Content-Type HTTP request header.
    success = CkRest::ckAddHeader(rest,"Content-Type","application/json; charset=UTF-8")

    jsonResponseStr.s = CkRest::ckFullRequestString(rest,"POST","/storage/v1/b",CkJsonObject::ckEmit(jsonReqBody))
    If CkRest::ckLastMethodSuccess(rest) = 0
        Debug CkRest::ckLastErrorText(rest)
        CkAuthGoogle::ckDispose(gAuth)
        CkRest::ckDispose(rest)
        CkJsonObject::ckDispose(jsonReqBody)
        CkJsonObject::ckDispose(objVersioning)
        ProcedureReturn
    EndIf

    ; Show the JSON response.  (See below for a sample JSON response.)
    Debug "Json Response: " + jsonResponseStr

    ; {
    ;  "kind": "storage#bucket",
    ;  "id": "chilkat-bucket-c",
    ;  "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-bucket-c",
    ;  "projectNumber": "999992999999",
    ;  "name": "chilkat-bucket-c",
    ;  "timeCreated": "2016-04-29T21:08:10.451Z",
    ;  "updated": "2016-04-29T21:08:10.451Z",
    ;  "metageneration": "1",
    ;  "owner": {
    ;   "entity": "project-owners-999992999999"
    ;  },
    ;  "location": "US",
    ;  "versioning": {
    ;   "enabled": true
    ;  },
    ;  "storageClass": "STANDARD",
    ;  "etag": "CAE="
    ; }
    ; 


    CkAuthGoogle::ckDispose(gAuth)
    CkRest::ckDispose(rest)
    CkJsonObject::ckDispose(jsonReqBody)
    CkJsonObject::ckDispose(objVersioning)


    ProcedureReturn
EndProcedure