(Xojo Plugin) File Existence Check

Testing to see if a file exists on the FTP server. The GetSizeByName method is a convenient way to check if a file exists. It will return -1 if the file does not exist, otherwise it returns the size of the file in bytes.

Chilkat Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

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

Dim ftp As New Chilkat.Ftp2

ftp.Hostname = "ftp.example.com"
ftp.Username = "username"
ftp.Password = "password"

// Connect and login to the FTP server.
Dim success As Boolean
success = ftp.Connect()
If (success <> True) Then
    System.DebugLog(ftp.LastErrorText)
    Return
End If

// Set the current remote directory to where the file is located:
success = ftp.ChangeRemoteDir("something")
If (success <> True) Then
    System.DebugLog(ftp.LastErrorText)
    Return
End If

// Test to see if the file exists by getting the file size by name. 
// If a -1 is returned, the file does not exist.
Dim fileSize As Int32
fileSize = ftp.GetSizeByName("test123.txt")
If (fileSize < 0) Then
    System.DebugLog("file does not exist")
Else
    System.DebugLog("file exists and is " + Str(fileSize) + " bytes in size")
End If

success = ftp.Disconnect()