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(C#) Cancel HTTP Get Async Task if not Completed after a Max TimeDemonstrates how to wait a maximum amount of time for an asynchronous task to completed. If not completed in the allotted amount of time, the task is cancelled.
// This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. bool success; Chilkat.Http http = new Chilkat.Http(); // Set some timeouts, in seconds: http.ConnectTimeout = 15; // ReadTimeout specifies the max number of seconds that must elapse when no additional data is received before // timing out. For example, if a server sends a 300 byte response at the rate of 1 byte per second, then // ReadTimeout would never cause a timeout because there is never a 15 second interval when nothing arrives. http.ReadTimeout = 15; string url = "https://your-url.com/something"; Chilkat.Task task = http.QuickGetStrAsync(url); task.Run(); // Wait a maximum of waitMaxMs for the task (i.e. the HTTP GET) to complete. // The Wait method returns when the task has been canceled, aborted, or completed, or when the max allotted time has passed. int waitMaxMs = 20000; task.Wait(waitMaxMs); // At this point, the GET may or may not have completed. // Rather than checking the Task status, we can call task.Cancel because // if the Task is no longer running (because it already completed, was canceled or aborted), then the // call to Cancel is a NO-OP (meaning it does nothing and the Task's status is unaffected). // Also, task.Cancel returns true if the task was in the "queued" or "running" state and was canceled or aborted. // The method returns false if the task has any other status. bool wasCanceled = task.Cancel(); if (wasCanceled == true) { Debug.WriteLine("The HTTP GET took too long and was canceled."); } else { // Find out what happened. if (task.StatusInt == 7) { // The task completed, which means the background thread's call to QuickGetStr completed // with success or failure. Find out which... if (task.TaskSuccess == true) { // Get the string response for the call to QuickGetStr (which happened in Chilkat's background thread). string responseStr = task.GetResultString(); Debug.WriteLine(responseStr); Debug.WriteLine("HTTP GET successful!"); } else { Debug.WriteLine("HTTP GET failed prior to waitMaxMs..."); Debug.WriteLine(task.ResultErrorText); } } else { // The task must've been canceled or aborted by some other means.. Debug.WriteLine("Task did not complete. Final status: " + task.Status); } } |
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