How do I use the PiFace C Library? - Raspberry Pi Forums

i can't find info on piface or offical website. makes thing?

can find github page.

library files in /usr/local/lib/
include file in /usr/local/includes/libpiface-1.0/

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#include <iostream> #include <libpiface-1.0/pfio.h>  using namespace std;  int main(int argc, char *argv[]) { 	pfio_init(); 	pfio_digital_write(0, 1); 	pfio_deinit();  	return 0; }

run

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g++ -l/usr/local/lib/ -lpiface-1.0 -o blah ./blah.c

this.

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/tmp/ccnw3zyb.o: in function `main': blah.c:(.text+0x8): undefined reference `pfio_init()' blah.c:(.text+0x14): undefined reference `pfio_digital_write(char, char)' blah.c:(.text+0x18): undefined reference `pfio_deinit()' collect2: ld returned 1 exit status 

i've been trying thing compile days

there c library can use

you compiling c++ compiler, library c.
havent told c++ compiler library c.

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extern "c" { #include <libpiface-1.0/pfio.h> } 

or!!! other way round ? c++ library source called blah.c , not blah.cpp compiler think c library.

ok.. i'm pretty sure 1 or other....

raspberrypi