B4X

File Existence Check

See more FTP Examples

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. B4X

Dim success As Boolean = False

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

Dim ftp As ChilkatFtp2
ftp.Initialize("ftp")

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

'  Connect and login to the FTP server.
success = ftp.Connect
If success <> True Then
    Log(ftp.LastErrorText)
    Return
End If


'  Set the current remote directory to where the file is located:
success = ftp.ChangeRemoteDir("something")
If success <> True Then
    Log(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 Int = ftp.GetSizeByName("test123.txt")
If fileSize < 0 Then
    Log("file does not exist")
Else
    Log("file exists and is " & fileSize & " bytes in size")
End If


success = ftp.Disconnect