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    writing cgi using C++

    Posts: 59
    in Software Development

    Hi

    I'm writing a C++ program to run it as cgi. I need to receive input, and as I've found out looking up the net, the most fundamental way is to use getenv() from cstdlib.h.

    I wanna know if there's any other interface to receiving environment variables, that is made for C++, I mean I look for equivalent of cstdlib.h in C++, IF EXISTS AT ALL.

    Thanks. :)

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    Comments

    • Posts: 59
      and of course, how to receive POST data?
    • Posts: 501
      ActiveX wrote:
      and of course, how to receive POST data?

      The system call interface to any CGI program/script is the same no matter the language the CGI was written in. This is documented in the HTML standards. You just need for your C/C++ program to process the passed arguments appropriately.
    • Posts: 647
      woboyle wrote:

      The system call interface to any CGI program/script is the same no matter the language the CGI was written in. This is documented in the HTML standards. You just need for your C/C++ program to process the passed arguments appropriately.

      I do not know much about this matter (if anything at all).

      Do you have any link where I could get introduced to all this CGI world?

      Thanks woboyle!

      Regards
    • Posts: 59
      Rubberman, what do you mean by that?
      Receiving GET data is as simple as using getenv("QUERY_STRING") , kid's stuff, but I need to handle much bigger data and therefore I have to use ... POST! you know.

      Please tell me clearly what should I do to receive post data?

      And also, I asked if there's any library that can be used instead of <stdlib.h> and is not based on <stdlib.h>.
    • Posts: 501
      I believe that the POST data is passed to the stdin of the CGI program.
    • Posts: 59
      Great!

      Well, do you "believe" that data is passed through stdin, or you're exactly 100% certain?

      And also, Rubberman, would you please tell me how to capture it?

      Thanks
    • Posts: 157
      According to Wikipedia, Rubberman is right: POST uses stdin to pass data to your CGI program. In C++, you should then be able to use the cin-stream to capture the data.
    • Posts: 59
      Thanks jabirali,

      Considering the fact that I've first explored the net and then picked the pen to weave a thread in forum, I already know that, and I've already used the most common methods of receiving data from cin, such as << and get(), but I know that here's something I don't know, say another member function of cin or something like that, that I don't know and is the key for me to going ahead.

      Most of the resources on the net are writing perl programs as CGI and rarely I can find some "useful" page on net to have talked about writing CGI using C++ and thus discussing the most common problems.

      I'll keep searching and trying other resources.

      But thanks anyway ;-)
    • Posts: 157
      Have you tried doing something like this? 
      1. #include <iostream>
      2. #include <sstream>
      3. #include <string>
      4. using namespace std;
      5.  
      6. int main()
      7. {
      8. 	stringstream ss;
      9. 	ss << cin.rdbuf();
      10.  
      11. 	cout << "Content-type: text/html\\n\\n<html><body>\\n"
      12. 	     << "Data received:\\n" << ss.str() << "\\n</body></html>\\n";
      13.  
      14. 	return 0;
      15. }
    • Posts: 59
      Hell! it works! Thanks Jabir. ;-)
    • Posts: 157
      I'm glad I could help :)
    • Posts: 1

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