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(Unicode C) Async Task ChainDemonstrates how to combine a sequence of asynchronous tasks into a single task chain to be run in a background thread.
#include <C_CkGlobalW.h> #include <C_CkMailManW.h> #include <C_CkTaskChainW.h> #include <C_CkTaskW.h> #include <C_CkEmailW.h> void ChilkatSample(void) { HCkGlobalW chilkatGlob; BOOL success; HCkMailManW mailman; int numMessages; HCkTaskChainW taskChain; int i; HCkTaskW task; HCkEmailW email; int numTasks; int taskIdx; // All Chilkat classes can be unlocked at once at the beginning of a program // by calling UnlockBundle. It requires a Bundle unlock code. chilkatGlob = CkGlobalW_Create(); success = CkGlobalW_UnlockBundle(chilkatGlob,L"Anything for 30-day trial."); if (success != TRUE) { wprintf(L"%s\n",CkGlobalW_lastErrorText(chilkatGlob)); CkGlobalW_Dispose(chilkatGlob); return; } mailman = CkMailManW_Create(); // Set the POP3 server's hostname CkMailManW_putMailHost(mailman,L"pop.someMailServer.com"); // Set the POP3 login/password and any other requirements.. CkMailManW_putPopUsername(mailman,L"myLogin"); CkMailManW_putPopPassword(mailman,L"myPassword"); CkMailManW_putPopSsl(mailman,TRUE); CkMailManW_putMailPort(mailman,995); // Connect to the POP3 server: success = CkMailManW_Pop3BeginSession(mailman); if (!success) { wprintf(L"%s\n",CkMailManW_lastErrorText(mailman)); CkGlobalW_Dispose(chilkatGlob); CkMailManW_Dispose(mailman); return; } // Get the number of messages in the mailbox. numMessages = CkMailManW_GetMailboxCount(mailman); if (numMessages == 0) { wprintf(L"No email messages in the POP3 mailbox.\n"); CkGlobalW_Dispose(chilkatGlob); CkMailManW_Dispose(mailman); return; } taskChain = CkTaskChainW_Create(); // Create async task objects to fetch each email message // by its sequence number for (i = 1; i <= numMessages; i++) { task = CkMailManW_FetchByMsgnumAsync(mailman,i); if (CkMailManW_getLastMethodSuccess(mailman) == FALSE) { wprintf(L"%s\n",CkMailManW_lastErrorText(mailman)); CkGlobalW_Dispose(chilkatGlob); CkMailManW_Dispose(mailman); CkTaskChainW_Dispose(taskChain); return; } // Append each task to the task chain. success = CkTaskChainW_Append(taskChain,task); if (!success) { wprintf(L"%s\n",CkTaskChainW_lastErrorText(taskChain)); CkGlobalW_Dispose(chilkatGlob); CkMailManW_Dispose(mailman); CkTaskChainW_Dispose(taskChain); return; } CkTaskW_Dispose(task); } // At this point, no tasks have actually started running. // All we've done so far is to create tasks for the work that will be done // when the task chain is run. // Start the task chain running in a background thread. // Each task is run one after the other (on the same background thread) until all tasks have completed. // The task chain will stop at the first task that fails. CkTaskChainW_putStopOnFailedTask(taskChain,TRUE); success = CkTaskChainW_Run(taskChain); if (!success) { wprintf(L"%s\n",CkTaskChainW_lastErrorText(taskChain)); CkGlobalW_Dispose(chilkatGlob); CkMailManW_Dispose(mailman); CkTaskChainW_Dispose(taskChain); return; } // The application is now free to do anything else // while the emails are being downloaded // For this example, we'll simply sleep and periodically // check to see if the taskchain if finished. while (CkTaskChainW_getFinished(taskChain) != TRUE) { // Sleep 100 ms. CkTaskChainW_SleepMs(taskChain,100); } // A finished task chain could be one that was canceled, aborted, or truly finished. // If the task chain "completed", then it ran to completion. 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 (CkTaskChainW_getStatusInt(taskChain) != 7) { wprintf(L"Task did not complete.\n"); wprintf(L"task chain status: %s\n",CkTaskChainW_status(taskChain)); CkGlobalW_Dispose(chilkatGlob); CkMailManW_Dispose(mailman); CkTaskChainW_Dispose(taskChain); return; } email = CkEmailW_Create(); numTasks = CkTaskChainW_getNumTasks(taskChain); taskIdx = 0; while ((taskIdx < numTasks)) { task = CkTaskChainW_GetTask(taskChain,taskIdx); // Load the email object with email downloaded by this task. success = CkEmailW_LoadTaskResult(email,task); if (!success) { wprintf(L"Failed to load email object for task.\n"); } else { wprintf(L"%s; %s\n",CkEmailW_ck_from(email),CkEmailW_subject(email)); } CkTaskW_Dispose(task); taskIdx = taskIdx + 1; } CkGlobalW_Dispose(chilkatGlob); CkMailManW_Dispose(mailman); CkTaskChainW_Dispose(taskChain); CkEmailW_Dispose(email); } |
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