javascript - undefined symbole using node-ffi in node js -

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i have include c code in nodejs used node-ffi,i created log.c:

#include <stdio.h> #if defined(win32) || defined(_win32) #define export __declspec(dllexport) #else #define export #endif  export  void etat_periph(char periph[]){ file* fichier=null; fichier=fopen("log.txt","a+"); fputs(fichier,periph); fprintf(fichier,"**********end**********"); fclose(fichier); }  export  void user_connect(char user[] ,char date[]){ file* fichier=null; fichier=fopen("log.txt","a+"); fputs(fichier,"***********new user*********"); fputs(fichier,"user connected: %s at: %s",user,date); fclose(fichier); }

i added file app.js:

var ffi = require('node-ffi'); var libfile = ffi.library('./libfile', {     'etat_periph': ["void", ["string", "string"]],         'user_connect': ["void", ["string", "string"]] }); io.sockets.on('connection', function (socket) {     socket.on("new_user", function (data) {         console.log("a new user connected", data);         var current_date = new date();         var date = current_date.tostring();         libfile.user_connect(data, date);     });     socket.on("state", function (data) {         console.log(data);         libfile.etat_periph(data);     });  });

when run app.js got error message:

error: dynamic symbol retrieval error: ./libfile.so: undefined symbol: etat_periph


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