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CGI and C/C++

Posted on 1997-04-20
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Last Modified: 2013-12-25
Hello everybody

I´m having trouble in "receiving" a form transmitted via POST method. My
program goes something like this:

#include "iostream.h"
#include "stdlib.h"
#include "stdio.h"
#include "conio.h"
#include "dos.h"
....
char *query_string;
if (getenv("REQUEST_METHOD")=="GET") query_string=getenv("QUERY_STRING");
else cin>>query_string;
....

I am using Visual C++ and Personal Web Server.
As POSTed forms are sent through stdin, I thought this should do the trick,
but it doesn´t. As I submit the form, my exe runs and hangs up my computer!
I think it is expecting data from stdin, but it should already be there!
I have no trouble with GET method, but sometimes I need to use POST.

Can anyone help me?

Thanks in advance
Ricardo Peres
Coimbra, Portugal
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Question by:rjperes
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1 Comment
 
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Accepted Solution

by:
julio011597 earned 100 total points
ID: 1827928
Well, i don't know C++, but it seems that your program cannot work.

> if(getenv("REQUEST_METHOD") == "GET")
does not do what you need.
Include <string.h> for strcmp() and go like this:
if(!strcmp(getenv("REQUEST_METHOD"), "GET"))

> query_string = getenv("QUERY_STRING");
this is ok, but beware that if QUERY_STRING is empty, then query_string will be a NULL pointer; you should handle this case.

> else cin >> query_string;
Does cin allocate memory for query_string??
If not, as i suppose, you should do it yourself.
So the code should look something like this (a bit redundant, for clearness:):
--//--
char *temp;
size_t content_length; /* check size_t on your os: i.e. check type needed for malloc() parameter */
...
else {
  if(!(temp = getenv("CONTENT_LENGTH")) || !(content_lenght = (size_t)atol(temp)) {
    return NO_QUERY_STRING; /* or such */
  }
  else {
    if(!(query_string = malloc(content_length + 1))) {
      return MALLOC_FAILED; /* or such, again */
    }
    else cin >> query_string;
  }
}
...
--//--

Last, shouldn't be:
#include <iostream.h>
#include <stdlib.h>
... and so on??

HTH, julio
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