NodeJS C++ JavaScript

[hmm]

Moinmoin,

ich habe in meinem NodeJs Projekt folgendes gemacht:

per Konsole:

• npm install -g node-gyp

und dann folgendes Files im gleichen Ordner angelegt:

• hello.cc

#include <node.h>
#include <v8.h>

using namespace v8;

Handle<Value> Method(const Arguments& args) {
  HandleScope scope;
  return scope.Close(String::New("world"));
}

void init(Handle<Object> target) {
  target->Set(String::NewSymbol("hello"),
      FunctionTemplate::New(Method)->GetFunction());
}
NODE_MODULE(hello, init)

-binding.gyp

{
  "targets": [
    {
      "target_name": "hello",
      "sources": [ "hello.cc" ]
    }
  ]
}

per Konsole:

• node-gyp configure build

meine Linux Konsole sagt mir dann:

gyp info it worked if it ends with ok
gyp info using node-gyp@3.6.0
gyp info using node@4.7.3 | linux | x64
gyp WARN download NVM_NODEJS_ORG_MIRROR is deprecated and will be removed in node-gyp v4, please use NODEJS_ORG_MIRROR
gyp WARN download NVM_NODEJS_ORG_MIRROR is deprecated and will be removed in node-gyp v4, please use NODEJS_ORG_MIRROR
gyp info spawn /usr/bin/python2
gyp info spawn args [ '/home/ubuntu/.nvm/versions/node/v4.7.3/lib/node_modules/node-gyp/gyp/gyp_main.py',
gyp info spawn args   'binding.gyp',
gyp info spawn args   '-f',
gyp info spawn args   'make',
gyp info spawn args   '-I',
gyp info spawn args   '/home/ubuntu/workspace/build/config.gypi',
gyp info spawn args   '-I',
gyp info spawn args   '/home/ubuntu/.nvm/versions/node/v4.7.3/lib/node_modules/node-gyp/addon.gypi',
gyp info spawn args   '-I',
gyp info spawn args   '/home/ubuntu/.node-gyp/4.7.3/include/node/common.gypi',
gyp info spawn args   '-Dlibrary=shared_library',
gyp info spawn args   '-Dvisibility=default',
gyp info spawn args   '-Dnode_root_dir=/home/ubuntu/.node-gyp/4.7.3',
gyp info spawn args   '-Dnode_gyp_dir=/home/ubuntu/.nvm/versions/node/v4.7.3/lib/node_modules/node-gyp',
gyp info spawn args   '-Dnode_lib_file=node.lib',
gyp info spawn args   '-Dmodule_root_dir=/home/ubuntu/workspace',
gyp info spawn args   '-Dnode_engine=v8',
gyp info spawn args   '--depth=.',
gyp info spawn args   '--no-parallel',
gyp info spawn args   '--generator-output',
gyp info spawn args   'build',
gyp info spawn args   '-Goutput_dir=.' ]
gyp WARN download NVM_NODEJS_ORG_MIRROR is deprecated and will be removed in node-gyp v4, please use NODEJS_ORG_MIRROR
gyp info spawn make
gyp info spawn args [ 'BUILDTYPE=Release', '-C', 'build' ]
make: Entering directory `/home/ubuntu/workspace/build'
  CXX(target) Release/obj.target/hello/hello.o
../hello.cc:6:28: error: ‘Arguments’ does not name a type
 Handle<Value> Method(const Arguments& args) {
                            ^
../hello.cc:6:39: error: ISO C++ forbids declaration of ‘args’ with no type [-fpermissive]
 Handle<Value> Method(const Arguments& args) {
                                       ^
In file included from /home/ubuntu/.node-gyp/4.7.3/include/node/node.h:42:0,
                 from ../hello.cc:1:
/home/ubuntu/.node-gyp/4.7.3/include/node/v8.h: In function ‘v8::Handle<v8::Value> Method(const int&)’:
/home/ubuntu/.node-gyp/4.7.3/include/node/v8.h:885:13: error: ‘v8::HandleScope::HandleScope()’ is protected
   V8_INLINE HandleScope() {}
             ^
../hello.cc:7:15: error: within this context
   HandleScope scope;
               ^
../hello.cc:8:16: error: ‘class v8::HandleScope’ has no member named ‘Close’
   return scope.Close(String::New("world"));
                ^
../hello.cc:8:22: error: ‘New’ is not a member of ‘v8::String’
   return scope.Close(String::New("world"));
                      ^
../hello.cc: In function ‘void init(v8::Handle<v8::Object>)’:
../hello.cc:12:15: error: ‘NewSymbol’ is not a member of ‘v8::String’
   target->Set(String::NewSymbol("hello"),
               ^
../hello.cc:13:35: error: no matching function for call to ‘v8::FunctionTemplate::New(v8::Handle<v8::Value> (&)(const int&))’
       FunctionTemplate::New(Method)->GetFunction());
                                   ^
../hello.cc:13:35: note: candidate is:
In file included from /home/ubuntu/.node-gyp/4.7.3/include/node/node.h:42:0,
                 from ../hello.cc:1:
/home/ubuntu/.node-gyp/4.7.3/include/node/v8.h:4349:34: note: static v8::Local<v8::FunctionTemplate> v8::FunctionTemplate::New(v8::Isolate*, v8::FunctionCallback, v8::Local<v8::Value>, v8::Local<v8::Signature>, int)
   static Local<FunctionTemplate> New(
                                  ^
/home/ubuntu/.node-gyp/4.7.3/include/node/v8.h:4349:34: note:   no known conversion for argument 1 from ‘v8::Handle<v8::Value>(const int&) {aka v8::Local<v8::Value>(const int&)}’ to ‘v8::Isolate*’
../hello.cc: In function ‘v8::Handle<v8::Value> Method(const int&)’:
../hello.cc:9:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^
make: *** [Release/obj.target/hello/hello.o] Error 1
make: Leaving directory `/home/ubuntu/workspace/build'
gyp ERR! build error 
gyp ERR! stack Error: `make` failed with exit code: 2
gyp ERR! stack     at ChildProcess.onExit (/home/ubuntu/.nvm/versions/node/v4.7.3/lib/node_modules/node-gyp/lib/build.js:285:23)
gyp ERR! stack     at emitTwo (events.js:87:13)
gyp ERR! stack     at ChildProcess.emit (events.js:172:7)
gyp ERR! stack     at Process.ChildProcess._handle.onexit (internal/child_process.js:211:12)
gyp ERR! System Linux 4.9.17-c9
gyp ERR! command "/home/ubuntu/.nvm/versions/node/v4.7.3/bin/node" "/home/ubuntu/.nvm/versions/node/v4.7.3/bin/node-gyp" "configure" "build"
gyp ERR! cwd /home/ubuntu/workspace
gyp ERR! node -v v4.7.3
gyp ERR! node-gyp -v v3.6.0
gyp ERR! not ok 

Ich wollte einfach nur ein Tutorial nachbauen um zu gucken wie ich per javaSAcript C++ Funktionen aufrufen kann. Könnt ihr mir sagen wo der Fehler ist oder habt ihr ein anderes Beispiel für mich?

[Robert B.]

Moin,

die Meldungen des C++-Compilers deuten darauf hin, dass in deiner C++-Datei mindestens ein Include fehlt.

Viele Grüße
Robert

[hmm]

jau, dass wars danke.

Nächste Frage: Wie finde ich die Url die zu diesem Service gehört:

var express = require("express");
var app = express();
    
const addon = require('./build/Release/hello');
console.log("antwort: " + addon.hello());

app.get('/addon', function(req, res){
    res.send(addon.hello());
});

Muss ich "routes" definieren oder sowas? Ich kann den Url der Seite nach beliebene um "/addon" erweitern aber ich krieg den Service trotzdem nicht aufgerufen

und das hier schreibt mir nur "test" in die Konsole:

    <script>
    console.log("test");
        $.get("/addon", function(data){
            console.log("Data: " + data );
        });
    </script>

[hmm]

mit welchem Konsolenbefehl (node test.js oder npm start etc.) muss ich den folgenden Code starten um per URL die GET Methode auszulösen?

var express = require('express')
var app = express() 

app.get('/', function (req, res) { 
    res.send('Hello World') 
    
})
app.listen(8080)