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(Unicode C) Async Methods Returning an StringDemonstrates how to call an asynchronous method that returns a string. This example sends an HTTPS GET request to a URL and gets the HTML response.
#include <C_CkHttpW.h> #include <C_CkTaskW.h> void ChilkatSample(void) { HCkHttpW http; HCkTaskW task; BOOL success; const wchar_t *html; // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. http = CkHttpW_Create(); task = CkHttpW_QuickGetStrAsync(http,L"https://www.chilkatsoft.com/helloWorld.html"); if (CkHttpW_getLastMethodSuccess(http) == FALSE) { wprintf(L"%s\n",CkHttpW_lastErrorText(http)); CkHttpW_Dispose(http); return; } // Start the background task. success = CkTaskW_Run(task); if (!success) { wprintf(L"%s\n",CkTaskW_lastErrorText(task)); CkTaskW_Dispose(task); CkHttpW_Dispose(http); return; } // The application is now free to do anything else // while the email is being sent. // For this example, we'll simply sleep and periodically // check to see if the HTTPS GET if finished. while (CkTaskW_getFinished(task) != TRUE) { // Sleep 100 ms. CkTaskW_SleepMs(task,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 (CkTaskW_getStatusInt(task) != 7) { wprintf(L"Task did not complete.\n"); wprintf(L"task status: %s\n",CkTaskW_status(task)); CkTaskW_Dispose(task); CkHttpW_Dispose(http); return; } // The QuickGetStr method returns a string. Therefore, after the task is finished, // we can get the string result by calling GetResultString. This is the return value had // we called QuickGetStr synchronously. html = CkTaskW_getResultString(task); wprintf(L"%s\n",html); CkTaskW_Dispose(task); CkHttpW_Dispose(http); } |
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