Nodejs deep interaction with C language

2, Node-ffi

1) Nodejs reading data from C language

Factorial.c

#include <stdint.h>#include<stdio.h>#include<stdlib.h>#include<stdbool.h>#include<string.h>#ifDefined (WIN32) | | Defined (_WIN32)#defineEXPORT __declspec (dllexport)#else#defineEXPORT#endiftypedefstruct{    DoubleLon; Doublelat;}gps_info_t;gps_info_t*GPS;voidGet_gps_shm_init (void) {GPS= (gps_info_t *)malloc(sizeof(gps_info_t));} EXPORT gps_info_t* Get_gps_info (void) {get_gps_shm_init (); GPS->lon =55.5; GPS->lat =55.5;returnGPS;}

Factorial.js

varFFI = require ('.. /node-ffi-master/')varRefstruct = require ('ref-struct');varRefarray = require ('Ref-array');var ref= Require ('ref');//GPS date structvarGPS =refstruct ({'Lon':ref. Types.Double,    'lat':ref. Types.Double,});varGpsstructarraytype =Refarray (GPS);varGps_info = Gpsstructarraytype (Ten);varLibfactorial = Ffi. Library ('./libfactorial', {  'Get_gps_info': [Gpsstructarraytype, ['void']],}); Gps_info= Libfactorial.get_gps_info (0) Console.log ('Your Output:'+ gps_info[0].lon) Console.log ('Your Output:'+ gps_info[0].lat)

2) Nodejs write data to C language

Factorial.c

#include <stdint.h>#include<stdio.h>#include<stdlib.h>#include<stdbool.h>#include<string.h>#ifDefined (WIN32) | | Defined (_WIN32)#defineEXPORT __declspec (dllexport)#else#defineEXPORT#endiftypedefstruct{    Char*user_name; Char*passwd; Char*dev_id;} user_info_t;user_info_t*user;voidPut_user_info_shm_init (void) {User= (user_info_t *)malloc(sizeof(user_info_t)); User->user_name = (Char*)malloc( +*sizeof(Char)); User-&GT;PASSWD = (Char*)malloc( +*sizeof(Char)); User->dev_id = (Char*)malloc( +*sizeof(Char));} EXPORTvoidPut_user_info (user_info_t*user_info)  {Put_user_info_shm_init (); printf ("get UserInfo (user_name):%s",user_info->user_name); printf ("get UserInfo (user_name):%s",user_info->passwd); printf ("get UserInfo (user_name):%s",user_info->dev_id);}

Factorial.js

varFFI = require ('.. /node-ffi-master/')varRefstruct = require ('ref-struct');varRefarray = require ('Ref-array');var ref= Require ('ref');//UI Date structvaruser =refstruct ({'user_name':'string',    'passwd':'string',    'dev_id':'string',});varUserstructarraytype =Refarray (user);varUser_info = Userstructarraytype (1); user_info[0].user_name ='ZDD'; user_info[0].PASSWD ='123'; user_info[0].dev_id ='65535';varLibfactorial = Ffi. Library ('./libfactorial', {  'Put_user_info': ['void', [Userstructarraytype]]}); Libfactorial.put_user_info (User_info) Console.log ('Your Input:'+ user_info[0].user_name) Console.log ('Your Input:'+ user_info[0].passwd) Console.log ('Your Input:'+ user_info[0].DEV_ID)

Nodejs deep interaction with C language