Xbase++

HttpPostJson2Async Example

Demonstrates use of the HttpPostJson2Async method. Xbase++

LOCAL nSuccess
LOCAL oHttp
LOCAL cJsonBody
LOCAL oTask
LOCAL oResp
LOCAL nStatusCode
LOCAL oJson

nSuccess := 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.

oHttp := 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..
oHttp:AcceptCharset := ""
oHttp:UserAgent := ""
oHttp:AcceptLanguage := ""
oHttp:AllowGzip := 0

cJsonBody := '{"client_id": "PLAID_CLIENT_ID", "secret":"PLAID_SECRET", "count": 10, "offset": 0}'
oTask := oHttp:PostJson2Async("https://sandbox.plaid.com/institutions/get", "application/json", cJsonBody)
IF (oHttp:LastMethodSuccess == 0)
    ? oHttp:LastErrorText
    oHttp:destroy()
    RETURN
ENDIF

//  Start the background task.
nSuccess := oTask:Run()
IF (.NOT. nSuccess)
    ? oTask:LastErrorText
    oTask:destroy()
    oHttp:destroy()
    RETURN
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 oTask:Finished != 1
    //  Sleep 100 ms.
    oTask: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 (oTask:StatusInt != 7)
    ? "Task did not complete."
    ? "task status: " + oTask:Status
    oTask:destroy()
    oHttp:destroy()
    RETURN
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 (oTask:TaskSuccess == 0)
    ? "The underlying task failed, and there is no HTTP response object."
    ? "The LastErrorText for the underlying method call is:"
    ? oTask:ResultErrorText
    oTask:destroy()
    oHttp:destroy()
    RETURN
ENDIF

//  To get the HTTP response object, create a new instance and load it with the result from the task.
oResp := CreateObject("Chilkat.HttpResponse")
oResp:LoadTaskResult(oTask)
oTask:destroy()

nStatusCode := oResp:StatusCode
? "Response status code = " + Str(nStatusCode)

//  Examine the JSON response..
oJson := CreateObject("Chilkat.JsonObject")
oJson:Load(oResp:BodyStr)
oJson:EmitCompact := 0
? "JSON Response Body:"
? oJson:Emit()

oHttp:destroy()
oResp:destroy()
oJson:destroy()