(CkPython) Co:Z SFTP Binary File Download (from z/OS IBM Mainframe)

Demonstrates how to download a binary file, such as a .zip, from a Co:Z SFTP server on a z/OS IBM Mainframe.

Note: This requires Chilkat v9.5.0.76 or greater.

Chilkat Python Downloads install with pip pip3 install chilkat or download... Python Module for Windows, MacOS, Linux, Alpine Linux, Solaris

import sys
import chilkat

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

sftp = chilkat.CkSFtp()

# Connect to the SSH server.  
hostname = "sftp.example.com"
port = 22
success = sftp.Connect(hostname,port)
if (success != True):
    print(sftp.lastErrorText())
    sys.exit()

success = sftp.AuthenticatePw("myLogin","myPassword")
if (success != True):
    print(sftp.lastErrorText())
    sys.exit()

success = sftp.InitializeSftp()
if (success != True):
    print(sftp.lastErrorText())
    sys.exit()

# To download a binary file from the Co:Z SFTP server, 
# we must switch to binary mode in the following unconventional way.
# We pretend to fetch a directory listing for "/+mode=binary"
# This has the effect of putting the server in binary mode for transfers.
handle = sftp.openDir("/+mode=binary")
if (sftp.get_LastMethodSuccess() != True):
    print(sftp.lastErrorText())
    sys.exit()

# Download the "directory listing" (but it's not actually a directory listing, and we'll just discard it.)
# dirListing is a CkSFtpDir
dirListing = sftp.ReadDir(handle)
if (sftp.get_LastMethodSuccess() != True):
    print(sftp.lastErrorText())
    sys.exit()

# Close the directory handle:
success = sftp.CloseHandle(handle)
if (success != True):
    print(sftp.lastErrorText())
    sys.exit()

# Download the binary file:
localFilePath = "c:/temp/test.zip"
remoteFilePath = "test.zip"
success = sftp.DownloadFileByName(remoteFilePath,localFilePath)
if (success != True):
    print(sftp.lastErrorText())
    sys.exit()

print("Success.")