如何在C ++中从命令行获取CGI表单数据

Question

I'm just starting to try and learn CGI programming. I have a simple webpage with a form. The form has two input fields asking for a number.

Im just trying to figure out how to use the command line to send the numbers in the text boxes to my CGI program, multiply them, and cout the result.

WITHOUT using an external library, how do I get the input from the form?

Answer 1

If I remember correctly, you have to check environment for QUERY_STRING

so if CGI passes you string some_path?var1=a&var2=b then you could do

char* query = getenv("QUERY_STRING");
// query will be set to "var1=a&var2=b"

int a = atoi( ... ); // some code to find var1 and get "a" as a string
int b = atoi( ... ); // some code to find var2 and get "b" as a string

fprintf("%d", a+b);