(PowerBuilder) Getting the HTTP Response after an Asynchronous HTTP Request Completes

Some HTTP methods return an HTTP response object. This example demonstrates how to obtain the HTTP response object for such a method when calling asynchronously.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

integer li_rc
oleobject loo_ChilkatGlob
integer li_Success
oleobject loo_Http
oleobject loo_Task
oleobject loo_Resp

// All Chilkat classes can be unlocked at once at the beginning of a program
// by calling UnlockBundle.  It requires a Bundle unlock code.
loo_ChilkatGlob = create oleobject
// Use "Chilkat_9_5_0.Global" for versions of Chilkat < 10.0.0
li_rc = loo_ChilkatGlob.ConnectToNewObject("Chilkat.Global")
if li_rc < 0 then
    destroy loo_ChilkatGlob
    MessageBox("Error","Connecting to COM object failed")
    return
end if
li_Success = loo_ChilkatGlob.UnlockBundle("Anything for 30-day trial.")
if li_Success <> 1 then
    Write-Debug loo_ChilkatGlob.LastErrorText
    destroy loo_ChilkatGlob
    return
end if

loo_Http = create oleobject
// Use "Chilkat_9_5_0.Http" for versions of Chilkat < 10.0.0
li_rc = loo_Http.ConnectToNewObject("Chilkat.Http")

// Call the async version of the QuickGetObj method to return a task object.
// The task object is loaded, but is in the Inert state -- meaning it is
// not yet scheduled to run on Chilkat's background thread pool.
loo_Task = loo_Http.QuickGetObjAsync("https://stackexchange.com")
if loo_Http.LastMethodSuccess <> 1 then
    Write-Debug loo_Http.LastErrorText
    destroy loo_ChilkatGlob
    destroy loo_Http
    return
end if

// Schedule the task for running on the thread pool.  This changes the task's state
// from Inert to Live.
li_Success = loo_Task.Run()
if li_Success <> 1 then
    Write-Debug loo_Task.LastErrorText
    destroy loo_Task
    destroy loo_ChilkatGlob
    destroy loo_Http
    return
end if

// The application is now free to do anything else
// while the HTML page is being downloaded.

// For this example, we'll simply sleep and periodically
// check to see if the QuickGetObjAsync if finished.
do while loo_Task.Finished <> 1

    // Sleep 100 ms.
    loo_Task.SleepMs(100)

loop

// A finished task could be one that was canceled, aborted, or truly finished.  

// 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 the result obtained via a GetResult* method.  (A "completed" task will
// have a StatusInt equal to 7.   If the task finished, but was not completed, then it must've
// been aborted or canceled:
if loo_Task.StatusInt <> 7 then
    Write-Debug "Task did not complete."
    Write-Debug "task status: " + loo_Task.Status
    destroy loo_Task
    destroy loo_ChilkatGlob
    destroy loo_Http
    return
end if

// The synchronous call to QuickGetObj would return an HTTP response object.  To get this 
// response object for the async call, we instantiate a new/empty HTTP response object,
// and then load it from the completed task.
loo_Resp = create oleobject
// Use "Chilkat_9_5_0.HttpResponse" for versions of Chilkat < 10.0.0
li_rc = loo_Resp.ConnectToNewObject("Chilkat.HttpResponse")

li_Success = loo_Resp.LoadTaskResult(loo_Task)
if li_Success <> 1 then
    Write-Debug loo_Resp.LastErrorText
    destroy loo_Task
    destroy loo_ChilkatGlob
    destroy loo_Http
    destroy loo_Resp
    return
end if

destroy loo_Task

// Now that we have the response, we can get all of the information:

Write-Debug "status code: " + string(loo_Resp.StatusCode)
Write-Debug "response header: " + loo_Resp.Header

// ..


destroy loo_ChilkatGlob
destroy loo_Http
destroy loo_Resp