如何使超链接调用相同的C ++ CGI进程

Question

So my C++ CGI program generates some html-page with several links. How can I make within the same C++ process that after clicking this links will be displayed some others pages with content depending on what hyperlink was clicked?

For now I just have variant that there will be other C++ CGI program that will read URL param with getenv, and this param will be different for every link from my first page. But I believe there must be a way of doing this with one C++ process.

Answer 1

You are trying to store session information in the memory of your CGI program. CGI protocol doesn't allow this by itself . You must store session information somewhere else. Your options are:

• Output HTML where result of your calculations is embedded in URLs, so that next execution will see those results (if that information is sensitive, this is a security flaw - you may overcome this with safe encryption).
• Store results outside your C++ program memory (a file?). Then output a cookie or embed a session identifier in the URLs. In the next execution, you perform a lookup with session identifier then load those results from your server. You must take care to free old data to avoid space exhaustion.
• Turn your C++ application into a web server! Your C++ application will answer HTTP requests (it will not be only a CGI application). That may be overkill, but might be necessary. I think there are free open source libraries that helps on that, or you can develop an Apache (httpd) module.

Hope that answers your question!