Node.JS C++ Native Addon read/write file? - c++

Question

The current problem I am facing with my project is that I do not know how to read/write files from the native node.js addon.
I have to build a type of encryption decryption ( RC6 algorithm ) program. But in order to encrypt files, i should be able to somehow read and write to them from "node-webkit". I am building the .cc file with nw-gyp, and tried multiple possibilities but none worked.
I am building my project with "grunt-node-webkit-builder" and I simply want to read/write one file from the build folder "nw" where nw.exe is located.
The Structure looks like this:
.webkitbuilds
.releases
.nw
.win
.nw
encrypt.txt
ffmpegsumo.dll
icudt.dll
libEGL.dll
libGLESv2.dll
nw.exe
nw.pak
How can I read in my c++ native node.js addon that "encrypt.txt" file.
Help ?
Edit:
Is there any way to use libuv with crypto ++ ?
EDIT 2:
I have the following code. The moment I execute it, the window freezes.
hello.cc:
#include <node.h>
#include <v8.h>
#include <stdio.h>
#include <fcntl.h>
using namespace v8;
#define __S_IREAD 0400 /* Read by owner. */
#define __S_IWRITE 0200 /* Write by owner. */
#define __S_IEXEC 0100 /* Execute by owner. */
#define S_IRUSR __S_IREAD /* Read by owner. */
uv_loop_t* loop;
uv_fs_t open_req;
void open_cb(uv_fs_t* req);
const char* path = "encrypt.txt";
void open_cb(uv_fs_t* req) {
int result = req->result;
if (result == -1) {
fprintf(stderr, "Error at opening file: %s\n",
uv_strerror(uv_last_error(loop)));
}
uv_fs_req_cleanup(req);
printf("Successfully opened file.\n");
}
char *get(v8::Local<v8::Value> value, const char *fallback = "") {
if (value->IsString()) {
v8::String::AsciiValue string(value);
char *str = (char *) malloc(string.length() + 1);
strcpy(str, *string);
return str;
}
char *str = (char *) malloc(strlen(fallback) + 1);
strcpy(str, fallback);
return str;
}
Handle<Value> Encrypt(const Arguments& args) {
HandleScope scope;
char* textToEncrypt = get(args[0], "str");
char* password = get(args[1], "str");
loop = uv_default_loop();
int r = uv_fs_open(loop, &open_req, path, O_RDONLY, S_IRUSR, open_cb);
if (r) {
fprintf(stderr, "Error at opening file: %s\n",
uv_strerror(uv_last_error(loop)));
}
uv_run(loop, UV_RUN_DEFAULT);
return scope.Close(String::New("done"));
}
void Init(Handle<Object> exports) {
exports->Set(String::NewSymbol("Encrypt"),
FunctionTemplate::New(Encrypt)->GetFunction());
}
NODE_MODULE(hello, Init)
In Javascript :
var application = require('./js/build/Release/hello');
var encrypted_data = "";
$(document).ready(function() {
$('#btn_encrypt').on('click', function() {
encrypted_data = application.Encrypt("val","val");
console.log(encrypted_data);
})
});