Unicode C

Async Task Chain (another example)

See more Async Examples

Demonstrates using a task chain to run a sequence of FTP tasks asynchronously. Unicode C

#include <C_CkFtp2W.h>
#include <C_CkTaskChainW.h>
#include <C_CkTaskW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkFtp2W ftp;
    HCkTaskChainW taskChain;
    HCkTaskW task;
    const wchar_t *localFilename;
    const wchar_t *remoteFilename;
    int numTasks;
    int taskIdx;

    success = FALSE;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    success = FALSE;

    ftp = CkFtp2W_Create();

    CkFtp2W_putHostname(ftp,L"ftp.example.com");
    CkFtp2W_putUsername(ftp,L"login");
    CkFtp2W_putPassword(ftp,L"password");

    // Connect and login to the FTP server.
    success = CkFtp2W_Connect(ftp);
    if (success != TRUE) {
        wprintf(L"%s\n",CkFtp2W_lastErrorText(ftp));
        CkFtp2W_Dispose(ftp);
        return;
    }

    taskChain = CkTaskChainW_Create();

    // Create a task to change to the remote directory where the file will be uploaded.
    task = CkFtp2W_ChangeRemoteDirAsync(ftp,L"junk");
    if (CkFtp2W_getLastMethodSuccess(ftp) == FALSE) {
        wprintf(L"%s\n",CkFtp2W_lastErrorText(ftp));
        CkFtp2W_Dispose(ftp);
        CkTaskChainW_Dispose(taskChain);
        return;
    }

    // Add this task to the task chain.
    success = CkTaskChainW_Append(taskChain,task);
    CkTaskW_Dispose(task);

    // Create a task to upload a file.
    localFilename = L"c:/temp/hamlet.xml";
    remoteFilename = L"hamlet.xml";

    task = CkFtp2W_PutFileAsync(ftp,localFilename,remoteFilename);
    if (CkFtp2W_getLastMethodSuccess(ftp) == FALSE) {
        wprintf(L"%s\n",CkFtp2W_lastErrorText(ftp));
        CkFtp2W_Dispose(ftp);
        CkTaskChainW_Dispose(taskChain);
        return;
    }

    // Add this task to the task chain.
    success = CkTaskChainW_Append(taskChain,task);
    CkTaskW_Dispose(task);

    // 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));
        CkFtp2W_Dispose(ftp);
        CkTaskChainW_Dispose(taskChain);
        return;
    }

    // The application is now free to do anything else
    // while the FTP commands are being run...

    // 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));
        CkFtp2W_Dispose(ftp);
        CkTaskChainW_Dispose(taskChain);
        return;
    }

    // If we got to this point, the ChangeRemoteDir and PutFile were successful.
    // We can visually verify by examining the LastErrorText that was recorded for each
    // of these method calls..
    numTasks = CkTaskChainW_getNumTasks(taskChain);
    taskIdx = 0;

    while ((taskIdx < numTasks)) {

        task = CkTaskChainW_GetTask(taskChain,taskIdx);

        // Examine the status of this task, and the ResultErrorText
        // (the ResultErrorText is the ftp.LastErrorText captured for FTP method called by the task).
        // Everything should indicate success.
        wprintf(L"task status: %s\n",CkTaskW_status(task));
        wprintf(L"task log: %s\n",CkTaskW_resultErrorText(task));

        CkTaskW_Dispose(task);

        taskIdx = taskIdx + 1;
    }

    success = CkFtp2W_Disconnect(ftp);


    CkFtp2W_Dispose(ftp);
    CkTaskChainW_Dispose(taskChain);

    }