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Check if a file exists on FTP, answer with yes or no

We have a system who storing files on a local server, where a part of the filenames contains an unique 8 char code.
This unique 8 char code is also stored in an access database.

Now I search for a function who:
1. On a click, makes this Access database connect to this local server through FTP (yes, ftp is a must).
2. Check if there is a filename having this unique 8 char code.
3. Tell Yes if the file exists, No if it doesn't exist.

And an overkill, but very useful if above is very easy:
4. If yes, click again and the file are transferred and runs with the computers associated software.

Is this possible? How do I do :)
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dingir
Asked:
dingir
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1 Solution
 
Jim P.Commented:
I've only have ever been able to shell FTP commands.  Someone pointed out this site to me to do FTP with api calls.
http://vbnet.mvps.org/index.html?code/internet/ftplist.htm

I have never used any of it, so I am not the expert to ask on this.
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harfangCommented:
Hello,

I'm sure there is a better way, but you can always do this, from a batch file or a Shell command:

    ftp -v -s:test.ftp ftp.site.com | find "filetocheck.txt" | find /v "ftp> " > test.out

test.ftp contains this (which can be written from VB, naturally)
-----------------------------
username
password
ls filetocheck.txt
quit
-----------------------------

After running the command, the file test.out will contain the name of the matching file, or nothing. It's easy to read that back into VB to proceed

A similar technique can be used to retrieve the file.

Hopw this helps
(°v°)
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dingirAuthor Commented:
Hi Jimpen! I'm about to trying this now.. I'm not sure how I get it into vbscript. I try to use Call Shell(..) as I use in some other similiar cases (just simple upload/download actions). You have any working vbscript-examples?
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dingirAuthor Commented:
Hi harfang! Thank's something like that - putted in a Shell, but I can't get that find-command works.. :/
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harfangCommented:
Ah, I knew it. Couldn't figure it out? There must be 1000 ways of doing this, but here is one:

Try ? CheckFTP("*.txt")
--------------------------------------------------------------------------------------
Option Explicit

Const FTP_SITE = "ftp.microsoft.com"
Const FTP_LOGIN = "anonymous" & vbCrLf & "i.am@testing.info"
Const FTP_PATH = "deskapps/ACCESS/KB"

Function CheckFTP(pstrFile As String)

    Dim strLine As String
   
    ChDir Environ("TEMP")
   
    ' ftp script:
    Open "~~check.ftp" For Output As #1
    Print #1, FTP_LOGIN
    Print #1, "cd " & FTP_PATH
    Print #1, "ls", pstrFile
    Print #1, "quit"
    Close #1
   
    ' batch file:
    Open "~~check.bat" For Output As #1
    Print #1, "ftp -v -s:~~check.ftp " & FTP_SITE _
        & "|find/v""ftp>"">~~check.out"
    Print #1, "del ~~check.ftp"
    Print #1, "del ~~check.bat"
    Close #1
   
    ' run batch
    CheckFTP = Null
    If Shell("~~check.bat") = 0 Then Exit Function
    Do While Dir("~~check.ftp") <> ""
        DoEvents
        ' should add a timer here...
    Loop
   
    ' read results...
    Open "~~check.out" For Input As #1
    Do Until EOF(1)
        Line Input #1, strLine
        strLine = Trim(strLine)
        If strLine <> "quit" And strLine <> "" Then _
            CheckFTP = CheckFTP + ";" & strLine
    Loop
    Close #1
    Kill "~~check.out"
   
End Function

More about FTP scripting at http://www.ericphelps.com/batch/samples/ftp.script.txt

Cheers!
(°v°)
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dingirAuthor Commented:
PERFECT! What a nice solution. Thank's a lot :)
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harfangCommented:
Glad you like it. It's low-tech (and shows my age) but it does seem to work...
Good luck!
(°v°)
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