CkPython

Write Text at a String Offset in a Remote SFTP File

Demonstrates the Chilkat SFtp.WriteFileText64s method, which is like WriteFileText64 but takes the byte offset as a decimal string. The arguments are the handle, the offset string, the charset, and the text.

Background: Some programming languages Chilkat targets lack a native 64-bit integer type, or make large integer literals awkward. Passing the offset as a decimal string sidesteps that entirely — the value is parsed by the library — while addressing the same large-file positions as the int64 form.

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import sys
import chilkat

success = False

#  Demonstrates the SFtp.WriteFileText64s method, which is like WriteFileText64 but takes the
#  byte offset as a decimal string.  The 1st argument is the handle, the 2nd is the offset string,
#  the 3rd is the charset, and the 4th is the text.

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()

handle = sftp.openFile("subdir/hugefile.dat","readWrite","openOrCreate")
if (sftp.get_LastMethodSuccess() == False):
    print(sftp.lastErrorText())
    sys.exit()

#  Supplying the offset as a string is convenient in languages without a native 64-bit integer.
offset = "5000000000"
success = sftp.WriteFileText64s(handle,offset,"utf-8","MARKER")
if (success == False):
    print(sftp.lastErrorText())
    sys.exit()

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

print("Wrote at the string offset.")

sftp.Disconnect()