Ruby

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. Ruby

require 'chilkat'

success = false

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

ftp = Chilkat::CkFtp2.new()

ftp.put_Hostname("ftp.someFtpServer.com")
success = ftp.ConnectOnly()
if (success != true)
    print ftp.lastErrorText() + "\n";
    exit
end

ftp.put_Username("myLogin")
ftp.put_Password("myPassword")
success = ftp.LoginAfterConnectOnly()
if (success != true)
    print ftp.lastErrorText() + "\n";
    exit
end

# 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 = ftp.ChangeRemoteDir("someRemoteDirectory")
if (success != true)
    print ftp.lastErrorText() + "\n";
    exit
end

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 is a CkTask
task = ftp.GetFileAsync(remoteFilename,localFilename)
if (ftp.get_LastMethodSuccess() == false)
    print ftp.lastErrorText() + "\n";
    exit
end

# Before starting the task, tell it to keep an in-memory log of what would've been
# ProgressInfo callbacks.
task.put_KeepProgressLog(true)

# Schedule the task for running on the thread pool.  This changes the task's state
# from Inert to Live.
success = task.Run()
if (success != true)
    print task.lastErrorText() + "\n";

    exit
end

# 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 task.get_Finished() != true

    if (task.get_PercentDone() != curPctDone)
        curPctDone = task.get_PercentDone()
        print curPctDone.to_s() + " percent done" + "\n";
    end

    # Check the progress info log.
    # Emit any log entries..
    while (task.get_ProgressLogSize() > 0)
        # Get the 1st entry, emit it, and then remove it..
        name = task.progressInfoName(0)
        value = task.progressInfoValue(0)

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

        print name + ": " + value + "\n";
        task.RemoveProgressInfo(0)
    end

    # Sleep 100 ms.
    task.SleepMs(100)

end

# Just in case there are any remaining entries...
while (task.get_ProgressLogSize() > 0)
    # Get the 1st entry, emit it, and then remove it..
    name = task.progressInfoName(0)
    value = task.progressInfoValue(0)
    print name + ": " + value + "\n";
    task.RemoveProgressInfo(0)
end

# 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 (task.get_StatusInt() != 7)
    print "Task did not complete." + "\n";
    print "task status: " + task.status() + "\n";

    exit
end

# 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 = task.GetResultBool()
if (success != true)
    # The task's ResultErrorText contains what would have been in the LastErrorText property had
    # the GetFile method been called synchronously.
    print task.resultErrorText() + "\n";
else
    print "File downloaded asynchronously." + "\n";
end

success = ftp.Disconnect()