Re: EuCGI test
At 04:00 PM 28-02-1999 , you wrote:
>Thank yuo...I can never say how happy i am at this...I have not messed
>with it yet but is there a way to make it run any E code? I do not know
>cgi(does anyone know of a good book or web site to start at?)
>
>Grape Vine
I noticed you visited me on 2-28 16:49:48 4.20.104.15 as Grape Vine ;)
On an earlier post is the full source code of the cgi you used.
CGI programming is easy! A CGI is a program that takes an input, process it
and then send it back to the webserver. The procesing of the data is done
as usual, you can use anything you want, including calling other
applications, connecting to databases, creating files, etc. The only
special mention is about getting the input and sending output.
There a mainly two way your CGI can get it's input:
a) Reading the standard input (like when using the '<' in DOS). Here you
must parse each query string that is in the form KEY1=VALUE?KEY2=VALUE2..
etc. Spaces are changed by the '+' sign. This way is the standard CGI (Unix)
b) Some server support another way, called WinCGI. WinCGI was developed by
O'Reilly for their WebSite webserver. Today several wintel webserver
support WinCGI. WinCGI is mich simpler than std. CGI. The webserver creates
an enviormental variable where a .INI file is specified. Your app then
reads the KY=VALUE pairs from that standard Windows ini file. The task is
simplifies because there are WinAPI functions that easily read a given key
value.
Each server may have it's own "other" way to pass parameters. In the case
of Xitami the KEY/VALUE pairs are set as enviormental variables and
alternativly as an input file (referenced by the CGI_STDIN enviomental
variable).
A CGI should output to the standard output. Because several languages can't
do this under Windows (mainly VB), many wintel webserver pass the app. a
filename it should use for it's output. Xitami defines this filename in the
CGI_STDOUT enviormental variable.
When sending your output to stdout the firs line must be exactly:
Content-type: text/html
followed by at least one blank line. After that you can send your html code.
I can't suggest any CGI book because I don't have any (well I have an
online version of "CGI programming on the WWW"), and haven't buy any
because they are usually based on Perl, something that I just don't want to
learn.
Some useful (related) links:
CGI official specification
http://hoohoo.ncsa.uiuc.edu/cgi/interface.html
CGI resources
http://www.cgi-resources.com/
Yahoo's CGI directory
ommon_Gateway_Interface/
Xitami
http://www.xitami.net
Internet Servers
http://serverwatch.internet.com/
Regards,
Daniel Berstein
[daber at pair.com]
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