CGI and C--getting non-form variables
I am using an imagemap(.gif and .map)in my CGI script (written in C). Along with the map I create a pulldown menu. The user can use either the imagemap or the menu to make their choice. I need to return 2 variables to my script. The menu works fine because I can pass hidden input through and then use the cgic.c library to access those variables.
The problem is that I can't read the variables when the user uses the imagemap. Entries in the .map file look like this:
poly http://.../cgi-bin/run?county=35&topic='C' 2,28 9,
56 5,64 43,64 44,30 2,28 2,28
When I do this, the cgiFormString function, etc. don't access the county and topic variables.
QUESTION: How do I read the non-form variables, using C? What is the function/code that will allow me to access them when passed this way? (NOTE: I'm trying to stay away from the client side implementation of the image maps because the maps are huge)
The problem is that I can't read the variables when the user uses the imagemap. Entries in the .map file look like this:
poly http://.../cgi-bin/run?county=35&topic='C' 2,28 9,
56 5,64 43,64 44,30 2,28 2,28
When I do this, the cgiFormString function, etc. don't access the county and topic variables.
QUESTION: How do I read the non-form variables, using C? What is the function/code that will allow me to access them when passed this way? (NOTE: I'm trying to stay away from the client side implementation of the image maps because the maps are huge)
ASKER CERTIFIED SOLUTION
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ASKER
When I did what you said, I got the same thing both times:
county=--&topic='C'
What you noticed is what I have a question about. Why can't I read the variables?
Given this, do you have anymore input?
If you could take a moment and find what the parse function is, I would appreciate it.
-Webslider
county=--&topic='C'
What you noticed is what I have a question about. Why can't I read the variables?
Given this, do you have anymore input?
If you could take a moment and find what the parse function is, I would appreciate it.
-Webslider
Two more questions: 1) What is the request method? Use:
print ("<P>QS CGIC:%s</P>", cgiRequestMethod);
to find out.
2) What version of cgic.c are you using
--mark;
print ("<P>QS CGIC:%s</P>", cgiRequestMethod);
to find out.
2) What version of cgic.c are you using
--mark;
ASKER
I use 'POST' everywhere else, but when the imagemap is clicked on it uses 'GET'.
As far as the version goes, I imagine I have the newest one. I got it from:
http://www.ee.hwh.edu.tw/teach/cgic/cgic.html#obtain
not more than a month ago.
-webslider
As far as the version goes, I imagine I have the newest one. I got it from:
http://www.ee.hwh.edu.tw/teach/cgic/cgic.html#obtain
not more than a month ago.
-webslider
I was looking through the latest cgic.c source code (version 1.05) and it will not read the QUERY_STRING variable if the method is POST, which would be one possible explanation for your problem.
If that's not it, email me your source code: mkornell@bridges.com
If that's not it, email me your source code: mkornell@bridges.com
As a test, write a program to display QUERY_STRING, both as cgic gets it and as it is set in the environment:
char *qs = getenv ("QUERY_STRING");
print ("<P>QS ENV:%s</P>", qs);
print ("<P>QS CGIC:%s</P>", cgiQueryString);
What does that tell you?
--mark;