C

Async FTP Progress Info

See more FTP Examples

Demonstrates checking for progress info updates when running a task asynchronously. This example demonstrates an FTP download. C

#include <C_CkFtp2.h>
#include <C_CkTask.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkFtp2 ftp;
    const char *localFilename;
    const char *remoteFilename;
    HCkTask task;
    int curPctDone;
    const char *name;
    const char *value;

    success = FALSE;

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

    ftp = CkFtp2_Create();

    CkFtp2_putHostname(ftp,"ftp.someFtpServer.com");
    success = CkFtp2_ConnectOnly(ftp);
    if (success != TRUE) {
        printf("%s\n",CkFtp2_lastErrorText(ftp));
        CkFtp2_Dispose(ftp);
        return;
    }

    CkFtp2_putUsername(ftp,"myLogin");
    CkFtp2_putPassword(ftp,"myPassword");
    success = CkFtp2_LoginAfterConnectOnly(ftp);
    if (success != TRUE) {
        printf("%s\n",CkFtp2_lastErrorText(ftp));
        CkFtp2_Dispose(ftp);
        return;
    }

    // Change to the remote directory where the file is located.
    // This step is only necessary if the file is not in the root directory
    // for the FTP account.
    success = CkFtp2_ChangeRemoteDir(ftp,"someRemoteDirectory");
    if (success != TRUE) {
        printf("%s\n",CkFtp2_lastErrorText(ftp));
        CkFtp2_Dispose(ftp);
        return;
    }

    localFilename = "/temp/romeo.xml";
    remoteFilename = "romeo.xml";

    // --------------------
    // Download a file
    // --------------------

    // Call the async version of the GetFile method to return a task object.
    // The task object is loaded, but is in the Inert state -- meaning it is
    // not yet scheduled to run on Chilkat's background thread pool.
    task = CkFtp2_GetFileAsync(ftp,remoteFilename,localFilename);
    if (CkFtp2_getLastMethodSuccess(ftp) == FALSE) {
        printf("%s\n",CkFtp2_lastErrorText(ftp));
        CkFtp2_Dispose(ftp);
        return;
    }

    // Before starting the task, tell it to keep an in-memory log of what would've been
    // ProgressInfo callbacks.
    CkTask_putKeepProgressLog(task,TRUE);

    // Schedule the task for running on the thread pool.  This changes the task's state
    // from Inert to Live.
    success = CkTask_Run(task);
    if (success != TRUE) {
        printf("%s\n",CkTask_lastErrorText(task));
        CkTask_Dispose(task);
        CkFtp2_Dispose(ftp);
        return;
    }

    // The application is now free to do anything else
    // while the file is being downloaded.

    // For this example, we'll simply sleep and periodically
    // check to see if the download is finished, and report the progress
    // along the way.
    curPctDone = 0;

    while (CkTask_getFinished(task) != TRUE) {

        if (CkTask_getPercentDone(task) != curPctDone) {
            curPctDone = CkTask_getPercentDone(task);
            printf("%d percent done\n",curPctDone);
        }

        // Check the progress info log.
        // Emit any log entries..
        while ((CkTask_getProgressLogSize(task) > 0)) {
            // Get the 1st entry, emit it, and then remove it..
            name = CkTask_progressInfoName(task,0);
            value = CkTask_progressInfoValue(task,0);

            // Entries reporting the received byte count will have the name "RcvByteCount"
            // Entries reporting the current bytes-per-second will have the name "RcvBytesPerSec"

            printf("%s: %s\n",name,value);
            CkTask_RemoveProgressInfo(task,0);
        }

        // Sleep 100 ms.
        CkTask_SleepMs(task,100);

    }

    // Just in case there are any remaining entries...
    while ((CkTask_getProgressLogSize(task) > 0)) {
        // Get the 1st entry, emit it, and then remove it..
        name = CkTask_progressInfoName(task,0);
        value = CkTask_progressInfoValue(task,0);
        printf("%s: %s\n",name,value);
        CkTask_RemoveProgressInfo(task,0);
    }

    // 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 (CkTask_getStatusInt(task) != 7) {
        printf("Task did not complete.\n");
        printf("task status: %s\n",CkTask_status(task));
        CkTask_Dispose(task);
        CkFtp2_Dispose(ftp);
        return;
    }

    // The GetFile method returns a boolean.  Therefore, after the task is finished,
    // we can get the boolean result by calling GetResultBool.  This is the return value had
    // we called GetFile synchronously.
    success = CkTask_GetResultBool(task);
    if (success != TRUE) {
        // The task's ResultErrorText contains what would have been in the LastErrorText property had
        // the GetFile method been called synchronously.
        printf("%s\n",CkTask_resultErrorText(task));
    }
    else {
        printf("File downloaded asynchronously.\n");
    }

    CkTask_Dispose(task);

    success = CkFtp2_Disconnect(ftp);


    CkFtp2_Dispose(ftp);

    }