Automated Polling & FTP Transfer question

Posted on 2001-07-16
Medium Priority
Last Modified: 2011-09-20
The exact requirement is listed below.I want VB code for this:

I am building a VB application which will look(Poll) in different FTP Server(Unix,Windows) as well as in the C:/Filein directory for incoming files.If a fileis avaialable the application will process the file, move it to a separate directory & FTP it back to Unix server for processing. FTP to Unix server is OK to me & I know it.Main part I am looking for is the polling in different FTP servers & whenever file comes process it & put it in a separate directory.Any help will be very much appreciated.

Question by:himachal

Expert Comment

ID: 6286845

Since YOU're building a VB application, let's see you code up to now!


Accepted Solution

jdesharnais earned 800 total points
ID: 6289992
I'm think what you are asking is how do i check if a file exists.
I would connect with verbose mode off the use the ls command to find if a file exists.
Here is an example of using ls with verbose mode on then off.

ftp> ls config.sys
200 PORT command successful.
150 Opening ASCII mode data connection for config.sys.
226 Transfer complete.
12 bytes received in 0.00 seconds (12000.00 Kbytes/sec)
ftp> ls config.syd
200 PORT command successful.
550 config.syd: error 2.
ftp> verbose
Verbose mode Off.
ftp> ls config.sys
ftp> ls config.syd
config.syd: error 2.

Author Comment

ID: 6290437
Thanks for all your help.I am looking for how I can poll in a particular directory(Unix or Windows) for a file.Also note that I have to process the file only when it's being transfered to that directory.
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Expert Comment

ID: 6290614
So what you are saying is that at every x time interval you want to check is the file exists, if it does get it, delete the original, process it, then put it back to a different directory

I have done a lot of ftp but never in vb.  Here are some commands I found in the msdn library.

FtpFindFirstFile Function


Searches the specified directory of the given FTP session. File and directory entries are returned to the application in the WIN32_FIND_DATA structure.


HINTERNET FtpFindFirstFile(
    IN HINTERNET hConnect,
    IN LPCTSTR lpszSearchFile,
    OUT LPWIN32_FIND_DATA lpFindFileData,
    IN DWORD dwFlags,
    IN DWORD_PTR dwContext

Return Value

Returns a valid handle for the request if the directory enumeration was started successfully, or returns NULL otherwise. To retrieve a specific error message, call GetLastError. If the function finds no matching files, GetLastError returns ERROR_NO_MORE_FILES.

FtpCommand Function


Allows an application to send commands directly to an FTP server.


BOOL FtpCommand(
    IN HINTERNET hConnect,
    IN BOOL fExpectResponse,
    IN DWORD dwFlags,
    IN LPCTSTR lpszCommand,
    IN DWORD_PTR dwContext,
    OUT HINTERNET *phFtpCommand

Return Value

Returns TRUE if successful, or FALSE otherwise. To get a specific error message, call GetLastError.


GetLastError can return ERROR_INTERNET_NO_DIRECT_ACCESS if the client application is offline. If one or more of the parameters are invalid, GetLastError will return ERROR_INVALID_PARAMETER.
LVL 49

Expert Comment

ID: 7153475
Hi himachal,
It appears that you have forgotten this question. I will ask Community Support to close it unless you finalize it within 7 days. I will ask a Community Support Moderator to:

    Accept jdesharnais's comment(s) as an answer.

himachal, if you think your question was not answered at all or if you need help, just post a new comment here; Community Support will help you.  DO NOT accept this comment as an answer.

EXPERTS: If you disagree with that recommendation, please post an explanatory comment.
DanRollins -- EE database cleanup volunteer

Expert Comment

ID: 7182130
Comment from expert accepted as answer

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