node-ffi

emulate-click.js

/**
 * Created by Prescott on 2015-05-08.
 */

const ffi = require("ffi");
// const ref = require('ref');


/*
const intPtr = ref.refType(ref.types.int32);
const Ucs2String = {
    indirection: 1,
    size: ref.sizeof.pointer,
    get: function (buffer, offset) {
        var _buf = buffer.readPointer(offset);
        // TODO: a *real* way to detect the end of the ucs2 string. this is a band-aid...
        return _buf.reinterpret(10000).toString('ucs2');
    },
    set: function (buffer, offset, string) {
        var _buf = new Buffer(Buffer.byteLength(string, 'ucs2') + 1);
        _buf.write(string, 'ucs2');
        _buf[_buf.length - 1] = 0;
        return buffer.writePointer(_buf, offset);
    }
};
*/

const user32 = ffi.Library('user32', {
    /**
     * Signature
     * MethodName: [ReturnType, [Args[0]Type, Args[1]Type, ...]]
     */
    'SetCursorPos': [ 'bool', ['int', 'int'] ],
    'mouse_event': ['void', ['int', 'int', 'int', 'int', 'int']]
    /*
    'FindWindowA': ['pointer', ['string', 'string']],
    'FindWindowExA': ['pointer', ['pointer', 'pointer', 'string', 'string']]
    'SendMessage ': ['int', ['pointer', 'uint', 'pointer', 'pointer']]
    'FindWindowW': ['pointer', [ Ucs2String, Ucs2String ]]
    */
    // put other functions that you want to use from the library here, e.g., "GetCursorPos"
});

const MOUSEEVENTF_LEFTDOWN = 0x02;
const MOUSEEVENTF_LEFTUP = 0x04;

module.exports = exports = function emulateClick(x, y) {
    user32.SetCursorPos(x, y);
    user32.mouse_event(MOUSEEVENTF_LEFTDOWN, x, y, 0, 0);
    user32.mouse_event(MOUSEEVENTF_LEFTUP, x, y, 0, 0);
};