[Discuss-gnuradio] Using Popen to start a pipe and pass the input

[Shashank Gaur]

Hello All,

I am trying to use popen to open an application under a block.

This looks something like that:

fp = popen(command, w); //doing it in write mode

if(!fp){
#Handle the error
}

..

pclose(fp);

Now the thing is even if I am trying to track using (fp != NULL) it
still keep executing the command over and over. Any ideas on that? May
somebody can guide me through right way to use popen?

Also to pass the c++ output stream, std::cout will work, right?

Thanks

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Re: [Discuss-gnuradio] Using Popen to start a pipe and pass the input

[Tom Rondeau]

On Mon, Jul 29, 2013 at 4:02 AM, Shashank Gaur shashankg...@ieee.org wrote:
 Hello All,

 I am trying to use popen to open an application under a block.

 This looks something like that:

 fp = popen(command, w); //doing it in write mode

 if(!fp){
 #Handle the error
 }

 ..

 pclose(fp);

 Now the thing is even if I am trying to track using (fp != NULL) it
 still keep executing the command over and over. Any ideas on that? May
 somebody can guide me through right way to use popen?

 Also to pass the c++ output stream, std::cout will work, right?

 Thanks


Hi Shashank,

I know you are working on GNU Radio for the GSoC, but this question
isn't related to GNU Radio. You'll be better off asking another forum
like Stack Overflow.

Tom

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Re: [Discuss-gnuradio] Using Popen to start a pipe and pass the input

[Shashank Gaur]

Apologies, I asked on Stack Overflow but posted here as well.

Thanks




On Mon, Jul 29, 2013 at 5:08 PM, Tom Rondeau t...@trondeau.com wrote:
 On Mon, Jul 29, 2013 at 4:02 AM, Shashank Gaur shashankg...@ieee.org wrote:
 Hello All,

 I am trying to use popen to open an application under a block.

 This looks something like that:

 fp = popen(command, w); //doing it in write mode

 if(!fp){
 #Handle the error
 }

 ..

 pclose(fp);

 Now the thing is even if I am trying to track using (fp != NULL) it
 still keep executing the command over and over. Any ideas on that? May
 somebody can guide me through right way to use popen?

 Also to pass the c++ output stream, std::cout will work, right?

 Thanks


 Hi Shashank,

 I know you are working on GNU Radio for the GSoC, but this question
 isn't related to GNU Radio. You'll be better off asking another forum
 like Stack Overflow.

 Tom

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