How Can I Integrate C Libraries Into Node.js Using SWIG?

Using C Library in Node.js

Node.js offers various ways to utilize C libraries. Here's a proven solution using SWIG:

The latest SWIG version 3.0 provides interface generators for Node.js, enabling you to seamlessly integrate C libraries.

Example Implementation

For instance, consider a C library with the header file myclass.h:

#include <iostream>

class MyClass {
    int myNumber;
public:
    MyClass(int number): myNumber(number) {}
    void sayHello() { std::cout << "Hello, my number is:" << myNumber << std::endl; }
};

SWIG Interface File

To use this class in Node.js, create the SWIG interface file mylib.i:

%module "mylib"
%{
#include "myclass.h"
%}
%include "myclass.h"

Binding File and Commands

Next, create the binding file binding.gyp:

{
  "targets": [
    {
      "target_name": "mylib",
      "sources": [ "mylib_wrap.cxx" ]
    }
  ]
}

Finally, run the following commands:

swig -c++ -javascript -node mylib.i
node-gyp build

Node.js Integration

Now, running Node.js within the same folder, you can access the C library:

> var mylib = require("./build/Release/mylib")
> var c = new mylib.MyClass(5)
> c.sayHello()
Hello, my number is:5

SWIG automatically discovers and generates natural interfaces, making it effortless to integrate C code into Node.js applications.

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