hid_xpcom.js

function usbhid(vendor_id, product_id) {
  this.product_id = product_id;
  this.vendor_id = vendor_id;
  this.buffer_1 = new Object();
  this.buffer_2 = new Object();
    this.xpcom = Components.classes["@firechip.info/hidapi;1"].createInstance().QueryInterface(Components.interfaces.nsIHid);
    this.manufacturer_string = function() {
        alert(this.xpcom.manufacturer_string);
    }
    this.product_string = function() {
        alert(this.xpcom.product_string);
    }
    this.getVendor_id = function() {
    this.vendor_id = this.xpcom.vendor_id.toString(16);
    while(vendor_id.length < 4) this.vendor_id = "0" + this.vendor_id;
    this.vendor_id = "0x" + this.vendor_id.toUpperCase();
    alert(this.vendor_id);
    }
    this.getProduct_id = function() {
    this.product_id = this.xpcom.product_id.toString(16);
    while(product_id.length < 4) product_id = "0" + product_id;
    product_id = "0x" + product_id.toUpperCase();
    alert(product_id);
    }
    this.hid_write = function(buffer_1, buffer_2) {
      var res = this.xpcom.hid_write(buffer_1, buffer_2);
      alert(res);
    }
    this.hid_read = function() {
    var res = this.xpcom.hid_read(this.buffer_1,this.buffer_2);
        alert(res);
        alert(this.buffer_1.value);
        alert(this.buffer_2.value);
    }
}

usb = new usbhid("0x4d8", "0x3f");