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(Unicode C) Cancel 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.
#include <C_CkHttpW.h> #include <C_CkTaskW.h> void ChilkatSample(void) { BOOL success; HCkHttpW http; int waitMaxMs; const wchar_t *downloadUrl; HCkTaskW task; BOOL wasCanceled; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. http = CkHttpW_Create(); // Set some timeouts, in seconds: CkHttpW_putConnectTimeout(http,15); CkHttpW_putReadTimeout(http,15); // Wait a max time of 2 seconds for the task. // In this example, it's an unreasonably small amount of time, // which means the task will get cancelled. waitMaxMs = 2000; // We're just going to download for 2 seconds and then cancel. // Substitute your own URL with a large enough file for testing.. downloadUrl = L"http://download.mono-project.com/archive/4.6.1/windows-installer/mono-4.6.1.5-gtksharp-2.12.38-win32-0.msi"; task = CkHttpW_DownloadAsync(http,downloadUrl,L"qa_output/mono.msi"); CkTaskW_Run(task); // Wait a maximum of waitMaxMs for the task (i.e. the HTTP download) to complete. // The Wait method returns when the task has been canceled, aborted, or completed, or when the max allotted time has passed. CkTaskW_Wait(task,waitMaxMs); // At this point, the download 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. wasCanceled = CkTaskW_Cancel(task); if (wasCanceled == TRUE) { wprintf(L"The HTTP download took too long and was canceled.\n"); } else { // Find out what happened. if (CkTaskW_getStatusInt(task) == 7) { // The task completed, which means the background thread's call to Download completed // with success or failure. Find out which... success = CkTaskW_GetResultBool(task); if (success == TRUE) { wprintf(L"Download successful!\n"); } else { wprintf(L"Download failed prior to waitMaxMs...\n"); wprintf(L"%s\n",CkTaskW_resultErrorText(task)); } } else { // The task must've been canceled or aborted by some other means.. wprintf(L"Task did not complete. Final status: %s\n",CkTaskW_status(task)); } } CkTaskW_Dispose(task); CkHttpW_Dispose(http); } |
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