structure support on js-ctypes

I posted an article to Japanese Mozilla community site about js-ctypes on Firefox.next (3.7). Firefox.next improves many features such as struct support and callback support for js-ctypes.

This is a sample to use color picker on Windows using js-ctypes. ComDlg32 has color picker API "ChooseColor()". This sample is to access ChooseColor().

Components.utils.import("resource://gre/modules/ctypes.jsm");
 
var custColors_type = ctypes.ArrayType(ctypes.int32_t, 16);
const CHOOSECOLOR = new ctypes.StructType(
 'CHOOSECOLOR',
 [
  {'lStructSize': ctypes.uint32_t},
  {'hwndOwner' : ctypes.uint32_t},
  {'hInstance' : ctypes.uint32_t},
  {'rgbResult' : ctypes.uint32_t},
  {'lpCustColors' : custColors_type.ptr},
  {'Flags' : ctypes.uint32_t},
  {'lCustData' : ctypes.uint32_t},
  {'lpfnHook' : ctypes.uint32_t},
  {'lpTemplateName' : ctypes.uint32_t}
 ]);
 
var comdlg32 = ctypes.open("comdlg32");
var ChooseColor = comdlg32.declare("ChooseColorW",
                                   ctypes.stdcall_abi,
                                   ctypes.int32_t,
                                   CHOOSECOLOR.ptr);
 
var custColors = new custColors_type();
var col = new CHOOSECOLOR (CHOOSECOLOR.size, 0, 0, 0,
                           custColors.address(), 0, 0, 0, 0);
 
ChooseColor(col.address());
alert(col.rgbResult);