dev-cpp-users

[Dev-C++] popen

[Erik S. <esc...@gm...>]

what library is popen in?

[Dev-C++] popen

[Erik S. <esc...@gm...>]

This code is for a mac

why does this not work?

#include <iostream>
#include <cstdio>
#include <fstream>
#include <string>

using namespace std;

int main(int argc,char *argv[]){

	FILE* pipe=popen("top","top");
	
	ifstream pipeStream(fileno(pipe));
	
	string total;
	char c;
	
	while((pipeStream.get(c))!=NULL){
	
		total+=c;
		
	}
	
	cout<<total<<endl;
	
	pipeStream.close();
	
	return 0;

}

Re: [Dev-C++] popen

[Martin D. <nex...@qu...>]

Erik Schmidt wrote:
> This code is for a mac
>
> why does this not work?
>
>     FILE* pipe=popen("top","top");
You request invalid permissions for the pipe. The code should be

FILE* pipe=popen("top","r");

Then you can read from that pipe.

Happy coding,
next_ghost

[Dev-C++] popen

[Erik S. <esc...@gm...>]

Here is my code

#include <iostream>
#include <cstdio>
#include <string>
#include <fstream>

using namespace std;

int main(int argc,char *argv[]){

	FILE* pipe=popen("ls","r");
	
	string total;
	char c;
	
	cout<<"initialized"<<endl;
	
	while(!feof(pipe)){
	
		total+=fgetc(pipe);
		
	}
	
	fclose(pipe);
	
	cout<<total<<endl;
	
	return 0;

}

that code works, however, I am not trying to work with ls.  I am  
trying to work with "top"  when I replace ls with top, the program  
refuses to work

this is on a mac

thanx for any help

-Erik

Re: [Dev-C++] popen

[Martin D. <nex...@qu...>]

Erik Schmidt wrote:
> Here is my code
> ...
> that code works, however, I am not trying to work with ls.  I am
> trying to work with "top"  when I replace ls with top, the program
> refuses to work 

That code works fine with both ls and top on my Gentoo Linux. Did you
press 'q' to quit top? Your program won't display any output until you
do that.

Happy coding,
next_ghost

[Dev-C++] popen

[Erik S. <esc...@gm...>]

how do I create a pipe to command line such that I can send  
information to a process such as top?

Re: [Dev-C++] popen

[Per W. <pw...@ia...>]

It is not part of any standard library.

However, google "popen for windows" gives a number of links to ports of
the function".

/Per W

On Sat, 6 May 2006, Erik Schmidt wrote:

> what library is popen in?
>
>
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