运行环境:
Ubuntu 12.04
node-gyp v3.3.1
Python 2.7.3
gcc 4.6.3
make 3.81
node v0.10.37
binding.gyp(注意:不是building)
{add.cc
"targets": [
{
"target_name": "add",
"sources": [ "add.cc" ]
}
]
}
#define BUILDING_NODE_EXTENSION#include <node.h>using namespace v8;Handle<Value> hello(const Arguments& args) { HandleScope scope; return scope.Close(String::New("hello,world"));}Handle<Value> myConcat(const Arguments& args) { HandleScope scope; if (args.Length() < 2 || !args[0]->IsString()) { return ThrowException(Exception::TypeError( String::New("Wrong arguments"))); } Local<Function> cb = Local<Function>::Cast(args[1]); const unsigned argc = 1; Local<Value> argv[argc] = { String::Concat(Local<String>::Cast(args[0]), String::New(" myConcat")) }; cb->Call(Context::GetCurrent()->Global(), argc, argv); return scope.Close(Undefined());}Handle<Value> add(const Arguments& args) { HandleScope scope; if (args.Length() < 2 || !args[0]->IsNumber() || !args[1]->IsNumber()) { return ThrowException(Exception::TypeError( String::New("Wrong arguments"))); } int32_t sum = args[0]->ToInteger()->Value() + args[1]->ToInteger()->Value(); return scope.Close(Integer::New(sum));}void RegModule(Handle<Object> target){ target->Set(String::NewSymbol("hello"), FunctionTemplate::New(hello)->GetFunction()); target->Set(String::NewSymbol("myConcat"), FunctionTemplate::New(myConcat)->GetFunction()); target->Set(String::NewSymbol("myAdd"), FunctionTemplate::New(add)->GetFunction());}//moduleName, RegisterModuleFunctionNameNODE_MODULE(add, RegModule);test.js
var test = require('./build/Release/add');
var str = test.hello();
console.log(str);
test.myConcat('nodejs', function(data) {
console.log(data);
});
console.log("2+3="+test.myAdd(2,3));
编译运行:
node-gyp configure build
node test.js
结果:
hello,world
nodejs myConcat
2+3=5
注意有些版本代码则是这样的:
下面代码则在如下环境运行成功
Ubuntu 14.04.1 LTS
node-gyp v3.3.1
Python 2.7.6
gcc 4.8.2
make 3.81
node v5.2.0
#include <node.h>
#include <v8.h>
using namespace v8;
// 传入了两个参数,args[0] 字符串,args[1] 回调函数
void hello(const FunctionCallbackInfo<Value>& args) {
// 使用 HandleScope 来管理生命周期
Isolate* isolate = Isolate::GetCurrent();
HandleScope scope(isolate);
// 判断参数格式和格式
if (args.Length() < 2 || !args[0]->IsString()) {
isolate->ThrowException(Exception::TypeError(
String::NewFromUtf8(isolate, "Wrong arguments")));
return;
}
// callback, 使用Cast方法来转换
Local<Function> callback = Local<Function>::Cast(args[1]);
Local<Value> argv[1] = {
// 拼接String
String::Concat(Local<String>::Cast(args[0]), String::NewFromUtf8(isolate, " world"))
};
// 调用回调, 参数: 当前上下文,参数个数,参数列表
callback->Call(isolate->GetCurrentContext()->Global(), 1, argv);
}
// 相当于在 exports 对象中添加 { hello: hello }
void init(Handle<Object> exports) {
NODE_SET_METHOD(exports, "hello", hello);
}
// 将 export 对象暴露出去
// 原型 `NODE_MODULE(module_name, Initialize)`
NODE_MODULE(test, init);
类型判断
Local<Value> arg = args[0];
bool isArray = arg->IsArray();
bool isBoolean = arg->IsBoolean();
bool isNumber = arg->IsNumber();
bool isInt32 = arg->IsInt32();
类型转换
Local<Value> arg = args[0];
Local<Object> = arg->ToObject();
Local<Boolean> = arg->ToBoolean();
Local<Number> = arg->ToNumber();
Local<Int32> = arg->ToInt32 ();
Local<Function> callback = Local<Function>::Cast(args)