library.getFunction(name, signature)

• name <string>
• signature <Object>
• 返回：<Function>

解析一个符号并返回一个可调用的 JavaScript 封装器。

🌐 Resolves a symbol and returns a callable JavaScript wrapper.

返回的函数有一个 .pointer 属性，包含作为 bigint 的原生函数地址。

🌐 The returned function has a .pointer property containing the native function address as a bigint.

如果相同的符号已经被解析过，再用不同的签名请求它会抛出异常。用相同的签名再次请求它会返回同样的函数，从 library.functions 读取它也是一样。

🌐 If the same symbol has already been resolved, requesting it again with a different signature throws. Requesting it again with the same signature returns the same function, as does reading it from library.functions.

const { DynamicLibrary, suffix } = require('node:ffi');

const lib = new DynamicLibrary(`./mylib.${suffix}`);
const add = lib.getFunction('add_i32', {
  arguments: ['int32', 'int32'],
  return: 'int32',
});

console.log(add(20, 22));
console.log(add.pointer); 拷贝