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(Unicode C) Async Methods Returning an ObjectDemonstrates how to call an asynchronous method that returns an object. This example reads email from a POP3 server using the Async versions of the Chilkat methods.
#include <C_CkGlobalW.h> #include <C_CkMailManW.h> #include <C_CkTaskW.h> #include <C_CkEmailW.h> void ChilkatSample(void) { HCkGlobalW chilkatGlob; BOOL success; HCkMailManW mailman; HCkTaskW task; int maxWaitMs; int numMessages; HCkEmailW email; int i; // 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: task = CkMailManW_Pop3BeginSessionAsync(mailman); if (CkMailManW_getLastMethodSuccess(mailman) == FALSE) { wprintf(L"%s\n",CkMailManW_lastErrorText(mailman)); CkGlobalW_Dispose(chilkatGlob); CkMailManW_Dispose(mailman); return; } // Start the background task. success = CkTaskW_Run(task); if (!success) { wprintf(L"%s\n",CkTaskW_lastErrorText(task)); CkTaskW_Dispose(task); CkGlobalW_Dispose(chilkatGlob); CkMailManW_Dispose(mailman); return; } // Wait for the POP3 connect task to finish. // The TRUE/FALSE returned by Wait applies to the Wait method call, not the task. maxWaitMs = 30000; success = CkTaskW_Wait(task,maxWaitMs); if (!success || (CkTaskW_getStatusInt(task) != 7) || (CkTaskW_getTaskSuccess(task) != TRUE)) { if (!success) { // The task.LastErrorText applies to the Wait method call. wprintf(L"%s\n",CkTaskW_lastErrorText(task)); } else { // The ResultErrorText applies to the underlying task method call (i.e. the Pop3BeginSession) wprintf(L"%s\n",CkTaskW_status(task)); wprintf(L"%s\n",CkTaskW_resultErrorText(task)); } CkTaskW_Dispose(task); CkGlobalW_Dispose(chilkatGlob); CkMailManW_Dispose(mailman); return; } CkTaskW_Dispose(task); // Get the number of messages in the mailbox. task = CkMailManW_GetMailboxCountAsync(mailman); // To keep the example short, we'll skip handling failures. // The failures would be handled in the same way as shown above. success = CkTaskW_Run(task); success = CkTaskW_Wait(task,maxWaitMs); numMessages = CkTaskW_GetResultInt(task); CkTaskW_Dispose(task); if (numMessages == 0) { CkGlobalW_Dispose(chilkatGlob); CkMailManW_Dispose(mailman); return; } email = CkEmailW_Create(); 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); CkEmailW_Dispose(email); return; } success = CkTaskW_Run(task); success = CkTaskW_Wait(task,maxWaitMs); if (!success || (CkTaskW_getStatusInt(task) != 7) || (CkTaskW_getTaskSuccess(task) != TRUE)) { if (!success) { // The task.LastErrorText applies to the Wait method call. wprintf(L"%s\n",CkTaskW_lastErrorText(task)); } else { // The ResultErrorText applies to the underlying task method call (i.e. the FetchByMsgnum) wprintf(L"%s\n",CkTaskW_status(task)); wprintf(L"%s\n",CkTaskW_resultErrorText(task)); } CkTaskW_Dispose(task); CkGlobalW_Dispose(chilkatGlob); CkMailManW_Dispose(mailman); CkEmailW_Dispose(email); return; } // Each Chilkat object that can be a return value of an asynchronous task will // have a method named LoadTaskResult. The object returned in the underlying // asynchronous method call is retrieved by calling LoadTaskResult. // To say it another way: The application will provide a pre-existing object of // the desired return type (in this case it is an email object). This object is // loaded by calling LoadTaskResult. success = CkEmailW_LoadTaskResult(email,task); CkTaskW_Dispose(task); if (!success) { wprintf(L"%s\n",CkEmailW_lastErrorText(email)); CkGlobalW_Dispose(chilkatGlob); CkMailManW_Dispose(mailman); CkEmailW_Dispose(email); return; } else { wprintf(L"%s: %s\n\n",CkEmailW_ck_from(email),CkEmailW_subject(email)); } } CkGlobalW_Dispose(chilkatGlob); CkMailManW_Dispose(mailman); CkEmailW_Dispose(email); } |
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