CkPython

Close a Remote SFTP File or Directory Handle

Demonstrates the Chilkat SFtp.CloseHandle method, which closes a remote file or directory handle previously returned by OpenFile or OpenDir. The only argument is the handle.

Background: Every opened handle corresponds to state the server holds, and servers cap how many a session may keep open at once, so a long-running program that forgets to close handles will eventually start failing to open new ones. Closing also ensures buffered writes are committed. Once closed, a handle is invalid and must not be reused.

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import sys
import chilkat

success = False

#  Demonstrates the SFtp.CloseHandle method, which closes a remote file or directory handle.  The
#  only argument is the handle returned by OpenFile or OpenDir.

sftp = chilkat.CkSFtp()

#  Connect, authenticate, and initialize the SFTP subsystem.
port = 22
success = sftp.Connect("sftp.example.com",port)
if (success == False):
    print(sftp.lastErrorText())
    sys.exit()

#  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.
password = "mySshPassword"

success = sftp.AuthenticatePw("mySshLogin",password)
if (success == False):
    print(sftp.lastErrorText())
    sys.exit()

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

#  Open a remote file, obtaining a handle.
handle = sftp.openFile("subdir/data.txt","readOnly","openExisting")
if (sftp.get_LastMethodSuccess() == False):
    print(sftp.lastErrorText())
    sys.exit()

#  ... use the handle ...

#  Close the handle to release the server-side resource.  A handle should not be used after it
#  is closed.
success = sftp.CloseHandle(handle)
if (success == False):
    print(sftp.lastErrorText())
    sys.exit()

print("Handle closed.")

sftp.Disconnect()