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(C#) Getting the HTTP Response after an Asynchronous HTTP Request CompletesSome HTTP methods return an HTTP response object. This example demonstrates how to obtain the HTTP response object for such a method when calling asynchronously.
// All Chilkat classes can be unlocked at once at the beginning of a program // by calling UnlockBundle. It requires a Bundle unlock code. Chilkat.Global chilkatGlob = new Chilkat.Global(); bool success = chilkatGlob.UnlockBundle("Anything for 30-day trial."); if (success != true) { Debug.WriteLine(chilkatGlob.LastErrorText); return; } Chilkat.Http http = new 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. Chilkat.Task task = http.QuickGetObjAsync("https://stackexchange.com"); if (http.LastMethodSuccess != true) { Debug.WriteLine(http.LastErrorText); return; } // Schedule the task for running on the thread pool. This changes the task's state // from Inert to Live. success = task.Run(); if (success != true) { Debug.WriteLine(task.LastErrorText); return; } // 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. while (task.Finished != true) { // Sleep 100 ms. task.SleepMs(100); } // 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 (task.StatusInt != 7) { Debug.WriteLine("Task did not complete."); Debug.WriteLine("task status: " + task.Status); return; } // 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. Chilkat.HttpResponse resp = new Chilkat.HttpResponse(); success = resp.LoadTaskResult(task); if (success != true) { Debug.WriteLine(resp.LastErrorText); return; } // Now that we have the response, we can get all of the information: Debug.WriteLine("status code: " + Convert.ToString(resp.StatusCode)); Debug.WriteLine("response header: " + resp.Header); // ... |
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