Re: Ports

[Scott Klement <sk@xxxxxxxxxxxxxxxx>]

Sender: Scott Klement <sk@xxxxxxxxxxxxxxxx>


> I've just started using FTP API and am very pleased with it.  I have one 
> problem though, I need to connect to port 222 instead of 21.  I've 
> changed the constant to 222 for FTP_PORT in the FTPAPI_H copy module but 
> it doesn't seem to make any difference it still wants to use 21.  What 
> am I missing?

Please don't change the constant.  It's a constant (instead of a variable) 
because it's not meant to be changed.  The way you're doing it WOULD work 
if you recompiled FTPAPI -- but I really discourage making changes to the 
source code -- it just makes it difficult to upgrade FTPAPI later.


A better idea is to pass the optional parameter for "port number" to 
either FTP_Conn() or FTP_Open() (whichever one you're using)

For example, this will use port 222 instead of 21 for the control channel:

     C                   eval      sess = FTP_conn( 'ftp.mybuddy.com'
     C                                            : 'scott'
     C                                            : 'mypassword'
     C                                            : 222 )

In fact, the reason that constant exists in FTPAPI_H is to allow access to 
the optional parameters that follow the port number without needing to 
hard-code the port in your programs.

For example, if you wanted to set a 30 second timeout but wanted to take 
the default for the port number, you'd code this:

     C                   eval      sess = FTP_conn( 'ftp.mybuddy.com'
     C                                            : 'scott'
     C                                            : 'mypassword'
     C                                            : FTP_PORT
     C                                            : 30 )

But, when you do want to change the port number, you should pass the 
number that you want in that parameter (as shown above)

If you're using the newer FTP_open() & FTP_login() instead of FTP_conn(), 
you'd code it this way:

     C                   eval      sess = FTP_open( 'ftp.mybuddy.com'
     C                                            : 222 )

     C                   if        FTP_login( sess
     C                                      : 'scott'
     C                                      : 'mypassword' ) < 0
      ***        ERROR! call FTP_errorMsg() to find out what happened
     C                   endif

Hope that helps
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