writing data do stdin

[tokra]

I'm trying to make a cgi program that will clean up and validate the requests before passing them on to the appropriate script. After a post, how do I put the string back into stdin so a program that I call using system will have it waiting for it?

WR

 

[Cagliostro]

when a console program is ran by another console program it inherits the console, so, just use cout or printf functions and everything will be fine.

Ion Filipski

 

[tokra]

How do you use cout to write to stdin rather than stdout?

WR

 

[Cagliostro]

sorry, I was not attentive. I think you can use fwrite and fprintf with stdin as a file pointer.

Ion Filipski

 

[tokra]

I tracked down a solution here is the code the demonstrates it.

#include <iostream>
#include <stdio.h>
#include <process.h>


int _tmain(int argc, _TCHAR* argv[])
{
	std::cout<<&quot;Items written to stdin:&quot;<<fwrite(&quot;test\n&quot;,1,5,stdin)<<std::endl;

	FILE* out;
	out=_popen(&quot;cmd&quot;,&quot;w&quot;);
	std::cout<<&quot;Items written to console:&quot;<<fwrite(&quot;test\n&quot;,1,5,out)<<std::endl;

	
	return 0;
}

WR

 

[ArkM]

We can't use fprintf etc to write to stdin. C-stream stdin is read-only. Check return code from fprintf(stdin,...) - it's -1 (error.
tokra wants a filter. It's impossible to do it with brute force...