call c program form php

[Anon]

Hi...

I need to write program that communicate with serial port, but can be controled from web. I intend to write program to communicated with com port in c and php for web end. I cant find any reference on php communicating with com port. Any idea how can i write program in c and can be integrate with php?

[Anon]

you sure? wont the exec() or system() commands work for you?

[ame12]

Rob is right... exec will be easiest. Another thing you might do is to wrap a cgi main() around the c code so that you can invoke it directly from fopen("http://127.0.0.1/...") - this would make it easier to distribute functionality between remote machines.

Dave

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[trellie]

Here's a little tricky part... you can use a named pipe to intercommunicate between php and your c program.

you create a named pipe with the command:

'mknod prog_pipe p'

this will create a NULL byte filename named 'prog_pipe'.

Then by ways of reading or writing to this file you can communicate with eachother..

shared memory can also be used but is a lot trickier and php has to be recompiled to enable it...