I have the following CPython code which I now try to run in IronPython:

import ctypes

class BarHeader(ctypes.Structure):
    _fields_ = [
        ("id", ctypes.c_char * 4),
        ("version", ctypes.c_uint32)]

bar_file = open("data.bar", "rb")
header_raw = bar_file.read(ctypes.sizeof(BarHeader))
header = BarHeader.from_buffer_copy(header_raw)

The last line raises this exception: TypeError: expected array, got str

I tried BarHeader.from_buffer_copy(bytes(header_raw)) instead of the above, but then the exception message changes to TypeError: expected array, got bytes.

Any idea what I'm doing wrong?