node.js调用C++函数的方法示例

// addon.cc
#include <node.h>
namespace demo {
using v8::Exception;
using v8::FunctionCallbackInfo;
using v8::Isolate;
using v8::Local;
using v8::Number;
using v8::Object;
using v8::String;
using v8::Value;// This is the implementation of the "add" method// Input arguments are passed using the// const FunctionCallbackInfo<Value>& args struct
void Add(const FunctionCallbackInfo<Value>& args) {
 Isolate* isolate = args.GetIsolate();
 // Check the number of arguments passed.
 if (args.Length() < 2) {
 // Throw an Error that is passed back to JavaScript
 isolate->ThrowException(Exception::TypeError(
  String::NewFromUtf8(isolate, "Wrong number of arguments")));
 return;
 }
 // Check the argument types
 if (!args[0]->IsNumber() || !args[1]->IsNumber()) {
 isolate->ThrowException(Exception::TypeError(
  String::NewFromUtf8(isolate, "Wrong arguments")));
 return;
 }
 // Perform the operation
 double value = args[0]->NumberValue()   args[1]->NumberValue();
 Local<Number> num = Number::New(isolate, value);
 // Set the return value (using the passed in
 // FunctionCallbackInfo<Value>&)
 args.GetReturnValue().Set(num);}
void Init(Local<Object> exports) {
 NODE_SET_METHOD(exports, "add", Add);}NODE_MODULE(NODE_GYP_MODULE_NAME, Init)
} // namespace demo

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

// test.js
const addon = require('./build/Release/addon');
console.log('This should be eight:', addon.add(3, 5));//结果为8

 "include_dirs": [
  "./gdal/include"
  ],

 'libraries': [
   "../gdal/lib/gdal_i.lib",
  ],

{
 "targets": [
 {
  "target_name": "addon",
  "sources": [
  "./C  _02/tile.cc"
  ],
  "include_dirs": [
  "./gdal/include"
  ],
  'libraries': [
   "../gdal/lib/gdal_i.lib",
  ],
 }
 ]
}

const addon=require（‘./build/Release/addon'）
var imagefile = "/vsicurl/http://sasmac.oss-cn-beijing.aliyuncs.com/cog.tif";
var x = 160;
var y = 83;
var l = 9;
console.log(addon.tileload(imagefile, x, y, l));