(Tcl) SFTP Fsync -- Flush an Open File on the Server

Demonstrates how to flush the contents of an open file on the server. This example only works for servers that implement the fsync@openssh.com extension.

Note: This example requires Chilkat v9.5.0.71 or later.

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load ./chilkat.dll

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

set sftp [new_CkSFtp]

# Pass a domain or IP address..
set success [CkSFtp_Connect $sftp "my-sftp-server.com" 22]
if {$success == 1} then {
    set success [CkSFtp_AuthenticatePw $sftp "mySFtpLogin" "mySFtpPassword"]
}

if {$success == 1} then {
    set success [CkSFtp_InitializeSftp $sftp]
}

if {$success != 1} then {
    puts [CkSFtp_lastErrorText $sftp]
    delete_CkSFtp $sftp
    exit
}

# Open a file on the server for writing.
set handle [CkSFtp_openFile $sftp "myTest.txt" "writeOnly" "createTruncate"]
if {[CkSFtp_get_LastMethodSuccess $sftp] != 1} then {
    puts [CkSFtp_lastErrorText $sftp]
    delete_CkSFtp $sftp
    exit
}

# Write some text to the file:
set success [CkSFtp_WriteFileText $sftp $handle "ansi" "abcdefghijklmnopqrstuvwxyz"]
if {$success != 1} then {
    puts [CkSFtp_lastErrorText $sftp]
    delete_CkSFtp $sftp
    exit
}

# Make sure the server flushes what we wrote to the disk..
# (this is requires a server that implements the fsync@openssh.com SFTP protocol extension)
set success [CkSFtp_Fsync $sftp $handle]
if {$success != 1} then {
    puts [CkSFtp_lastErrorText $sftp]
    delete_CkSFtp $sftp
    exit
}

# ....
# ....

set success [CkSFtp_WriteFileText $sftp $handle "ansi" "ABCDEFGHIJKLMNOPQRSTUVWXYZ"]
if {$success != 1} then {
    puts [CkSFtp_lastErrorText $sftp]
    delete_CkSFtp $sftp
    exit
}

# Close the file.
set success [CkSFtp_CloseHandle $sftp $handle]
if {$success != 1} then {
    puts [CkSFtp_lastErrorText $sftp]
    delete_CkSFtp $sftp
    exit
}

puts "Success."

delete_CkSFtp $sftp