DataFlex

HttpPostJson2Async Example

Demonstrates use of the HttpPostJson2Async method. DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoHttp
    String sJsonBody
    Variant vTask
    Handle hoTask
    Handle hoResp
    Integer iStatusCode
    Handle hoJson
    String sTemp1
    Integer iTemp1
    Boolean bTemp1

    Move False To iSuccess

    // 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.

    Get Create (RefClass(cComChilkatHttp)) To hoHttp
    If (Not(IsComObjectCreated(hoHttp))) Begin
        Send CreateComObject of hoHttp
    End

    // 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..
    Set ComAcceptCharset Of hoHttp To ""
    Set ComUserAgent Of hoHttp To ""
    Set ComAcceptLanguage Of hoHttp To ""
    Set ComAllowGzip Of hoHttp To False

    Move '{"client_id": "PLAID_CLIENT_ID", "secret":"PLAID_SECRET", "count": 10, "offset": 0}' To sJsonBody
    Get ComPostJson2Async Of hoHttp "https://sandbox.plaid.com/institutions/get" "application/json" sJsonBody To vTask
    If (IsComObject(vTask)) Begin
        Get Create (RefClass(cComChilkatTask)) To hoTask
        Set pvComObject Of hoTask To vTask
    End
    Get ComLastMethodSuccess Of hoHttp To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Start the background task.
    Get ComRun Of hoTask To iSuccess
    If (Not iSuccess) Begin
        Get ComLastErrorText Of hoTask To sTemp1
        Showln sTemp1
        Send Destroy of hoTask
        Procedure_Return
    End

    // 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.  
    While ((ComFinished(hoTask)) <> True)
        // Sleep 100 ms.
        Send ComSleepMs To hoTask 100
    Loop

    // 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.
    Get ComStatusInt Of hoTask To iTemp1
    If (iTemp1 <> 7) Begin
        Showln "Task did not complete."
        Get ComStatus Of hoTask To sTemp1
        Showln "task status: " sTemp1
        Send Destroy of hoTask
        Procedure_Return
    End

    // 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).
    Get ComTaskSuccess Of hoTask To bTemp1
    If (bTemp1 = False) Begin
        Showln "The underlying task failed, and there is no HTTP response object."
        Showln "The LastErrorText for the underlying method call is:"
        Get ComResultErrorText Of hoTask To sTemp1
        Showln sTemp1
        Send Destroy of hoTask
        Procedure_Return
    End

    // To get the HTTP response object, create a new instance and load it with the result from the task.
    Get Create (RefClass(cComChilkatHttpResponse)) To hoResp
    If (Not(IsComObjectCreated(hoResp))) Begin
        Send CreateComObject of hoResp
    End
    Get ComLoadTaskResult Of hoResp vTask To iSuccess
    Send Destroy of hoTask

    Get ComStatusCode Of hoResp To iStatusCode
    Showln "Response status code = " iStatusCode

    // Examine the JSON response..
    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get ComBodyStr Of hoResp To sTemp1
    Get ComLoad Of hoJson sTemp1 To iSuccess
    Set ComEmitCompact Of hoJson To False
    Showln "JSON Response Body:"
    Get ComEmit Of hoJson To sTemp1
    Showln sTemp1


End_Procedure