(Unicode C) Async SFTP Progress Info

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

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#include <C_CkGlobalW.h>
#include <C_CkSFtpW.h>
#include <C_CkTaskW.h>

void ChilkatSample(void)
    {
    HCkGlobalW chilkatGlob;
    BOOL success;
    HCkSFtpW sftp;
    const wchar_t *hostname;
    int port;
    const wchar_t *localFilePath;
    const wchar_t *remoteFilePath;
    HCkTaskW task;
    int curPctDone;
    const wchar_t *name;
    const wchar_t *value;

    // 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;
    }

    sftp = CkSFtpW_Create();

    // Set some timeouts, in milliseconds:
    CkSFtpW_putConnectTimeoutMs(sftp,15000);
    CkSFtpW_putIdleTimeoutMs(sftp,15000);

    // Connect to the SSH server.  
    // The standard SSH port = 22
    // The hostname may be a hostname or IP address.
    hostname = L"www.my-ssh-server.com";
    port = 22;
    success = CkSFtpW_Connect(sftp,hostname,port);
    if (success != TRUE) {
        wprintf(L"%s\n",CkSFtpW_lastErrorText(sftp));
        CkGlobalW_Dispose(chilkatGlob);
        CkSFtpW_Dispose(sftp);
        return;
    }

    // Authenticate with the SSH server.  Chilkat SFTP supports
    // both password-based authenication as well as public-key
    // authentication.  This example uses password authenication.
    success = CkSFtpW_AuthenticatePw(sftp,L"myLogin",L"myPassword");
    if (success != TRUE) {
        wprintf(L"%s\n",CkSFtpW_lastErrorText(sftp));
        CkGlobalW_Dispose(chilkatGlob);
        CkSFtpW_Dispose(sftp);
        return;
    }

    // After authenticating, the SFTP subsystem must be initialized:
    success = CkSFtpW_InitializeSftp(sftp);
    if (success != TRUE) {
        wprintf(L"%s\n",CkSFtpW_lastErrorText(sftp));
        CkGlobalW_Dispose(chilkatGlob);
        CkSFtpW_Dispose(sftp);
        return;
    }

    // --------------------
    // Download a file
    // --------------------
    localFilePath = L"c:/temp/hamlet.xml";
    remoteFilePath = L"subdir1/subdir2/hamlet.xml";

    // Call the async version of the DownloadFileByName 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 = CkSFtpW_DownloadFileByNameAsync(sftp,remoteFilePath,localFilePath);
    if (CkSFtpW_getLastMethodSuccess(sftp) == FALSE) {
        wprintf(L"%s\n",CkSFtpW_lastErrorText(sftp));
        CkGlobalW_Dispose(chilkatGlob);
        CkSFtpW_Dispose(sftp);
        return;
    }

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

    // Schedule the task for running on the thread pool.  This changes the task's state
    // from Inert to Live.
    success = CkTaskW_Run(task);
    if (success != TRUE) {
        wprintf(L"%s\n",CkTaskW_lastErrorText(task));
        CkTaskW_Dispose(task);
        CkGlobalW_Dispose(chilkatGlob);
        CkSFtpW_Dispose(sftp);
        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 (CkTaskW_getFinished(task) != TRUE) {

        if (CkTaskW_getPercentDone(task) != curPctDone) {
            curPctDone = CkTaskW_getPercentDone(task);
            wprintf(L"%d percent done\n",curPctDone);
        }

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

            wprintf(L"%s: %s\n",name,value);
            CkTaskW_RemoveProgressInfo(task,0);
        }

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

    }

    // Just in case there are any remaining entries...
    while ((CkTaskW_getProgressLogSize(task) > 0)) {
        // Get the 1st entry, emit it, and then remove it..
        name = CkTaskW_progressInfoName(task,0);
        value = CkTaskW_progressInfoValue(task,0);
        wprintf(L"%s: %s\n",name,value);
        CkTaskW_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 (CkTaskW_getStatusInt(task) != 7) {
        wprintf(L"Task did not complete.\n");
        wprintf(L"task status: %s\n",CkTaskW_status(task));
        CkTaskW_Dispose(task);
        CkGlobalW_Dispose(chilkatGlob);
        CkSFtpW_Dispose(sftp);
        return;
    }

    // The DownloadFileByName 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 DownloadFileByName synchronously.
    success = CkTaskW_GetResultBool(task);
    if (success != TRUE) {
        // The task's ResultErrorText contains what would have been in the LastErrorText property had
        // the DownloadFileByName method been called synchronously.
        wprintf(L"%s\n",CkTaskW_resultErrorText(task));
    }
    else {
        wprintf(L"File downloaded asynchronously.\n");
    }

    CkTaskW_Dispose(task);


    CkGlobalW_Dispose(chilkatGlob);
    CkSFtpW_Dispose(sftp);

    }