CkPython

Monitor FTP Transfer Progress

Demonstrates the progress properties CurBytesReceived, CurBytesReceivedStr, CurBytesSent, CurBytesSentStr, ProgressMonSize, PercentDoneScale, and AutoGetSizeForProgress.

Note: The local paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: Percentage progress needs a known total, but FTP does not always report a file's size up front — so AutoGetSizeForProgress issues a SIZE command before a download, and ProgressMonSize supplies an expected size when even that is unavailable (a one-shot value consumed by the next transfer). PercentDoneScale sets the resolution of progress callbacks. The current byte counts are exposed both as 32-bit integers and as strings, the string forms avoiding integer-width limits for very large transfers.

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CkPython

import sys
import chilkat

success = False

ftp = chilkat.CkFtp2()

ftp.put_Hostname("ftp.example.com")
ftp.put_Username("myFtpLogin")

#  Normally you would not hard-code the password in source.  You should instead obtain it
#  from an interactive prompt, environment variable, or a secrets vault.
ftp.put_Password("myPassword")

success = ftp.Connect()
if (success == False):
    print(ftp.lastErrorText())
    sys.exit()

#  AutoGetSizeForProgress sends a SIZE command before a download so percentage-based progress can
#  be computed.
ftp.put_AutoGetSizeForProgress(True)

#  PercentDoneScale sets the value representing one hundred percent in PercentDone callbacks.
#  1000 gives tenth-of-a-percent resolution.
ftp.put_PercentDoneScale(1000)

#  ProgressMonSize is a one-shot expected size for the next download when the size is not
#  otherwise known.  It is consumed by the next download and reset to 0.
ftp.put_ProgressMonSize(20485760)

success = ftp.GetFile("public_html/bigfile.zip","qa_output/bigfile.zip")
if (success == False):
    print(ftp.lastErrorText())
    sys.exit()

#  After a transfer, the current byte counts are available as 32-bit numbers or as strings (the
#  string forms avoid integer-size limits).
print("Bytes received: " + str(ftp.get_CurBytesReceived()))
print("Bytes received (str): " + ftp.curBytesReceivedStr())
print("Bytes sent: " + str(ftp.get_CurBytesSent()))
print("Bytes sent (str): " + ftp.curBytesSentStr())

success = ftp.Disconnect()
if (success == False):
    print(ftp.lastErrorText())
    sys.exit()