Visual FoxPro

Clear the FTP Directory Listing Cache

Demonstrates the Chilkat Ftp2.ClearDirCache method, which clears the cached listing for the current remote directory. It takes no arguments; the next indexed-listing call fetches a fresh listing from the server.

Background: The index-based directory API caches the listing the first time you read it, so repeated accessor calls avoid extra round trips. The trade-off is staleness: if the directory changes — files added or removed, whether by your own operations or another process — the cache still reflects the old state. ClearDirCache discards it so the next GetDirCount queries the server again.

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LOCAL lnSuccess
LOCAL loFtp
LOCAL n

lnSuccess = 0

*  Demonstrates the Ftp2.ClearDirCache method, which clears the cached listing for the current
*  remote directory.  It takes no arguments and is a void method.

loFtp = CreateObject('Chilkat.Ftp2')

loFtp.Hostname = "ftp.example.com"
loFtp.Username = "myFtpLogin"

*  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.
loFtp.Password = "myPassword"

lnSuccess = loFtp.Connect()
IF (lnSuccess = 0) THEN
    ? loFtp.LastErrorText
    RELEASE loFtp
    CANCEL
ENDIF

lnSuccess = loFtp.ChangeRemoteDir("public_html")
IF (lnSuccess = 0) THEN
    ? loFtp.LastErrorText
    RELEASE loFtp
    CANCEL
ENDIF

*  The first GetDirCount caches the listing.
n = loFtp.GetDirCount()
? "Entries: " + STR(n)

*  ... the remote directory changes (files added or removed by another process) ...

*  Discard the cache so the next listing call fetches fresh data from the server.
loFtp.ClearDirCache()

n = loFtp.GetDirCount()
? "Entries after refresh: " + STR(n)

lnSuccess = loFtp.Disconnect()
IF (lnSuccess = 0) THEN
    ? loFtp.LastErrorText
    RELEASE loFtp
    CANCEL
ENDIF

RELEASE loFtp