CkPython

Get a Remote File's Size as a String

Demonstrates the Chilkat SFtp.GetFileSizeStr method, which returns a remote file's size in bytes as a decimal string. The arguments are the remote path (or handle), whether symbolic links are followed, and whether the first argument is a handle.

Background: Returning the size as a string sidesteps integer-width limits entirely, so it is the safe choice for files of any size — multi-gigabyte archives, disk images, database dumps. It is also convenient in programming languages that lack a native 64-bit integer type. When you need to do arithmetic on the value, parse the string; when you only need to display or log it, the string is ready to use.

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import sys
import chilkat

success = False

#  Demonstrates the SFtp.GetFileSizeStr method, which returns a remote file's size in bytes as a
#  decimal string.  The 1st argument is the remote path (or handle), the 2nd selects whether
#  symbolic links are followed, and the 3rd indicates whether the 1st argument is a handle.

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()

#  The 2nd argument (bFollowLinks) selects whether a symbolic link is followed to its target.
#  The 3rd argument (bIsHandle) is False here because the 1st argument is a path, not an
#  open handle.
bFollowLinks = True
bIsHandle = False

#  A string return avoids the 32-bit overflow that GetFileSize32 would have for very large files.
fileSize = sftp.getFileSizeStr("subdir/hugefile.dat",bFollowLinks,bIsHandle)
if (sftp.get_LastMethodSuccess() == False):
    print(sftp.lastErrorText())
    sys.exit()

print("File size: " + fileSize + " bytes")

sftp.Disconnect()