B4X

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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Dim success As Boolean = 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.

Dim sftp As ChilkatSFtp
sftp.Initialize("sftp")

'  Connect, authenticate, and initialize the SFTP subsystem.
Dim port As Int = 22
success = sftp.Connect("sftp.example.com", port)
If success = False Then
    Log(sftp.LastErrorText)
    Return
End If


'  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.
Dim password As String = "mySshPassword"

success = sftp.AuthenticatePw("mySshLogin", password)
If success = False Then
    Log(sftp.LastErrorText)
    Return
End If


success = sftp.InitializeSftp
If success = False Then
    Log(sftp.LastErrorText)
    Return
End If


Dim handle As String = sftp.OpenFile("subdir/hugefile.dat", "readWrite", "openOrCreate")
If sftp.LastMethodSuccess = False Then
    Log(sftp.LastErrorText)
    Return
End If


'  Supplying the offset as a string is convenient in languages without a native 64-bit integer.
Dim offset As String = "5000000000"
success = sftp.WriteFileText64s(handle, offset, "utf-8", "MARKER")
If success = False Then
    Log(sftp.LastErrorText)
    Return
End If


success = sftp.CloseHandle(handle)
If success = False Then
    Log(sftp.LastErrorText)
    Return
End If

Log("Wrote at the string offset.")

sftp.Disconnect