Visual FoxPro

HttpPostJson2Async Example

Demonstrates use of the HttpPostJson2Async method. Visual FoxPro

LOCAL lnSuccess
LOCAL loHttp
LOCAL lcJsonBody
LOCAL loTask
LOCAL loResp
LOCAL lnStatusCode
LOCAL loJson

lnSuccess = 0

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

* See PostJson2 Example for the synchronous equivalent of this example.

loHttp = CreateObject('Chilkat.Http')

* Sends a POST equivalent to the following CURL command:

* curl -X POST https://sandbox.plaid.com/institutions/get \
*   -H 'content-type: application/json' \
*   -d '{
*     "client_id": String,
*     "secret":String,
*     "count": Number,
*     "offset": Number
*   }'

* Suppress some default headers that would automatically added..
loHttp.AcceptCharset = ""
loHttp.UserAgent = ""
loHttp.AcceptLanguage = ""
loHttp.AllowGzip = 0

lcJsonBody = '{"client_id": "PLAID_CLIENT_ID", "secret":"PLAID_SECRET", "count": 10, "offset": 0}'
loTask = loHttp.PostJson2Async("https://sandbox.plaid.com/institutions/get","application/json",lcJsonBody)
IF (loHttp.LastMethodSuccess = 0) THEN
    ? loHttp.LastErrorText
    RELEASE loHttp
    CANCEL
ENDIF

* Start the background task.
lnSuccess = loTask.Run()
IF (NOT lnSuccess) THEN
    ? loTask.LastErrorText
    RELEASE loTask
    RELEASE loHttp
    CANCEL
ENDIF

* The application is now free to do anything else
* while the HTTP POST is in progress

* For this example, we'll simply sleep and periodically
* check to see if the HTTP POST is finished.  
DO WHILE loTask.Finished <> 1
    * Sleep 100 ms.
    loTask.SleepMs(100)
ENDDO

* When we get here, the task is either finished successfully or not, or was canceled/aborted.

* If the task was "canceled", it was canceled prior to actually starting.  This could
* happen if the task was canceled while waiting in a thread pool queue to be scheduled by Chilkat's
* background thread pool scheduler.  

* If the task was "aborted", it indicates that it was canceled while running in a background thread.  
* The ResultErrorText will likely indicate that the task was aborted.

* If the task "completed", then it ran to completion, but the actual success/failure of the method
* is determined by getting the result of the underlying method call.
* A task status of 7 indicates completion.
IF (loTask.StatusInt <> 7) THEN
    ? "Task did not complete."
    ? "task status: " + loTask.Status
    RELEASE loTask
    RELEASE loHttp
    CANCEL
ENDIF

* When called synchronously, the PostJson2 method returns an HTTP response object,
* unless the method failed and there was no response to be had.
* Check to see if PostJson2 method failed (and thus there is no response object).
IF (loTask.TaskSuccess = 0) THEN
    ? "The underlying task failed, and there is no HTTP response object."
    ? "The LastErrorText for the underlying method call is:"
    ? loTask.ResultErrorText
    RELEASE loTask
    RELEASE loHttp
    CANCEL
ENDIF

* To get the HTTP response object, create a new instance and load it with the result from the task.
loResp = CreateObject('Chilkat.HttpResponse')
loResp.LoadTaskResult(loTask)
RELEASE loTask

lnStatusCode = loResp.StatusCode
? "Response status code = " + STR(lnStatusCode)

* Examine the JSON response..
loJson = CreateObject('Chilkat.JsonObject')
loJson.Load(loResp.BodyStr)
loJson.EmitCompact = 0
? "JSON Response Body:"
? loJson.Emit()

RELEASE loHttp
RELEASE loResp
RELEASE loJson