c-type.js

Components.utils.import("resource://gre/modules/ctypes.jsm");
Components.utils.import("resource://gre/modules/Services.jsm");


// Or using Services.jsm and Ci = Components.interfaces
var file = Components.classes["@mozilla.org/file/directory_service;1"].
           getService(Components.interfaces.nsIProperties).
           get("CurProcD", Components.interfaces.nsIFile);

// Append the file name.
file.append("hidapi.dll");

dump(file.path);

var lib = ctypes.open(file.path);

/* 	if (hid_init())
		return -1;

	devs = hid_enumerate(0x0, 0x0); */
  
var hid =  lib.declare("hid_init",
                        ctypes.winapi_abi,
                        ctypes.bool      /* return type */);
var struct_hid_device_info;

  struct_hid_device_info = ctypes.StructType('hid_device_info', [
    {'path': ctypes.char.ptr},
    {'vendor_id': ctypes.unsigned_short},
    {'product_id': ctypes.unsigned_short},
    {'serial_number': ctypes.jschar.ptr},
    {'release_number': ctypes.unsigned_short},
    {'manufacturer_string': ctypes.jschar.ptr},
    {'product_string': ctypes.jschar.ptr},
    {'usage_page': ctypes.unsigned_short},
    {'usage': ctypes.unsigned_short},
    {'interface_number': ctypes.int}
  ]);  
/* Declare the signature of the function we are going to call */
var enumerate = lib.declare("hid_enumerate",
                         ctypes.winapi_abi,
                         struct_hid_device_info,
                         ctypes.int32_t,
                         ctypes.int32_t);

hid();
var log_enumerate = enumerate(0, 0); 

dump(struct_hid_device_info);


lib.close();