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Current File : /Program Files (x86)/Certbot/pkgs/win32/lib/win32gui_struct.py
# This is a work in progress - see Demos/win32gui_menu.py

# win32gui_struct.py - helpers for working with various win32gui structures.
# As win32gui is "light-weight", it does not define objects for all possible
# win32 structures - in general, "buffer" objects are passed around - it is
# the callers responsibility to pack the buffer in the correct format.
#
# This module defines some helpers for the commonly used structures.
#
# In general, each structure has 3 functions:
#
# buffer, extras = PackSTRUCTURE(items, ...)
# item, ... = UnpackSTRUCTURE(buffer)
# buffer, extras = EmtpySTRUCTURE(...)
#
# 'extras' is always items that must be held along with the buffer, as the
# buffer refers to these object's memory.
# For structures that support a 'mask', this mask is hidden from the user - if
# 'None' is passed, the mask flag will not be set, or on return, None will
# be returned for the value if the mask is not set.
#
# NOTE: I considered making these structures look like real classes, and
# support 'attributes' etc - however, ctypes already has a good structure
# mechanism - I think it makes more sense to support ctype structures
# at the win32gui level, then there will be no need for this module at all.
# XXX - the above makes sense in terms of what is built and passed to
# win32gui (ie, the Pack* functions) - but doesn't make as much sense for
# the Unpack* functions, where the aim is user convenience.

import sys
import win32gui
import win32con
import struct
import array
import commctrl
import pywintypes

is64bit = "64 bit" in sys.version

try:
    from collections import namedtuple

    def _MakeResult(names_str, values):
        names = names_str.split()
        nt = namedtuple(names[0], names[1:])
        return nt(*values)


except ImportError:
    # no namedtuple support - just return the values as a normal tuple.
    def _MakeResult(names_str, values):
        return values


_nmhdr_fmt = "PPi"
if is64bit:
    # When the item past the NMHDR gets aligned (eg, when it is a struct)
    # we need this many bytes padding.
    _nmhdr_align_padding = "xxxx"
else:
    _nmhdr_align_padding = ""

# Encode a string suitable for passing in a win32gui related structure
# If win32gui is built with UNICODE defined (ie, py3k), then functions
# like InsertMenuItem are actually calling InsertMenuItemW etc, so all
# strings will need to be unicode.
if win32gui.UNICODE:

    def _make_text_buffer(text):
        # XXX - at this stage win32gui.UNICODE is only True in py3k,
        # and in py3k is makes sense to reject bytes.
        if not isinstance(text, str):
            raise TypeError("MENUITEMINFO text must be unicode")
        data = (text + "\0").encode("utf-16le")
        return array.array("b", data)


else:

    def _make_text_buffer(text):
        if isinstance(text, str):
            text = text.encode("mbcs")
        return array.array("b", text + "\0")


# make an 'empty' buffer, ready for filling with cch characters.
def _make_empty_text_buffer(cch):
    return _make_text_buffer("\0" * cch)


if sys.version_info < (3, 0):

    def _make_memory(ob):
        return str(buffer(ob))

    def _make_bytes(sval):
        return sval


else:

    def _make_memory(ob):
        return bytes(memoryview(ob))

    def _make_bytes(sval):
        return sval.encode("ascii")


# Generic WM_NOTIFY unpacking
def UnpackWMNOTIFY(lparam):
    format = "PPi"
    buf = win32gui.PyGetMemory(lparam, struct.calcsize(format))
    return _MakeResult("WMNOTIFY hwndFrom idFrom code", struct.unpack(format, buf))


def UnpackNMITEMACTIVATE(lparam):
    format = _nmhdr_fmt + _nmhdr_align_padding
    if is64bit:
        # the struct module doesn't handle this correctly as some of the items
        # are actually structs in structs, which get individually aligned.
        format = format + "iiiiiiixxxxP"
    else:
        format = format + "iiiiiiiP"
    buf = win32gui.PyMakeBuffer(struct.calcsize(format), lparam)
    return _MakeResult(
        "NMITEMACTIVATE hwndFrom idFrom code iItem iSubItem uNewState uOldState uChanged actionx actiony lParam",
        struct.unpack(format, buf),
    )


# MENUITEMINFO struct
# http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/WinUI/WindowsUserInterface/Resources/Menus/MenuReference/MenuStructures/MENUITEMINFO.asp
# We use the struct module to pack and unpack strings as MENUITEMINFO
# structures.  We also have special handling for the 'fMask' item in that
# structure to avoid the caller needing to explicitly check validity
# (None is used if the mask excludes/should exclude the value)
_menuiteminfo_fmt = "5i5PiP"


def PackMENUITEMINFO(
    fType=None,
    fState=None,
    wID=None,
    hSubMenu=None,
    hbmpChecked=None,
    hbmpUnchecked=None,
    dwItemData=None,
    text=None,
    hbmpItem=None,
    dwTypeData=None,
):
    # 'extras' are objects the caller must keep a reference to (as their
    # memory is used) for the lifetime of the INFO item.
    extras = []
    # ack - dwItemData and dwTypeData were confused for a while...
    assert (
        dwItemData is None or dwTypeData is None
    ), "sorry - these were confused - you probably want dwItemData"
    # if we are a long way past 209, then we can nuke the above...
    if dwTypeData is not None:
        import warnings

        warnings.warn("PackMENUITEMINFO: please use dwItemData instead of dwTypeData")
    if dwItemData is None:
        dwItemData = dwTypeData or 0

    fMask = 0
    if fType is None:
        fType = 0
    else:
        fMask |= win32con.MIIM_FTYPE
    if fState is None:
        fState = 0
    else:
        fMask |= win32con.MIIM_STATE
    if wID is None:
        wID = 0
    else:
        fMask |= win32con.MIIM_ID
    if hSubMenu is None:
        hSubMenu = 0
    else:
        fMask |= win32con.MIIM_SUBMENU
    if hbmpChecked is None:
        assert hbmpUnchecked is None, "neither or both checkmark bmps must be given"
        hbmpChecked = hbmpUnchecked = 0
    else:
        assert hbmpUnchecked is not None, "neither or both checkmark bmps must be given"
        fMask |= win32con.MIIM_CHECKMARKS
    if dwItemData is None:
        dwItemData = 0
    else:
        fMask |= win32con.MIIM_DATA
    if hbmpItem is None:
        hbmpItem = 0
    else:
        fMask |= win32con.MIIM_BITMAP
    if text is not None:
        fMask |= win32con.MIIM_STRING
        str_buf = _make_text_buffer(text)
        cch = len(text)
        # We are taking address of strbuf - it must not die until windows
        # has finished with our structure.
        lptext = str_buf.buffer_info()[0]
        extras.append(str_buf)
    else:
        lptext = 0
        cch = 0
    # Create the struct.
    # 'P' format does not accept PyHANDLE's !
    item = struct.pack(
        _menuiteminfo_fmt,
        struct.calcsize(_menuiteminfo_fmt),  # cbSize
        fMask,
        fType,
        fState,
        wID,
        int(hSubMenu),
        int(hbmpChecked),
        int(hbmpUnchecked),
        dwItemData,
        lptext,
        cch,
        int(hbmpItem),
    )
    # Now copy the string to a writable buffer, so that the result
    # could be passed to a 'Get' function
    return array.array("b", item), extras


def UnpackMENUITEMINFO(s):
    (
        cb,
        fMask,
        fType,
        fState,
        wID,
        hSubMenu,
        hbmpChecked,
        hbmpUnchecked,
        dwItemData,
        lptext,
        cch,
        hbmpItem,
    ) = struct.unpack(_menuiteminfo_fmt, s)
    assert cb == len(s)
    if fMask & win32con.MIIM_FTYPE == 0:
        fType = None
    if fMask & win32con.MIIM_STATE == 0:
        fState = None
    if fMask & win32con.MIIM_ID == 0:
        wID = None
    if fMask & win32con.MIIM_SUBMENU == 0:
        hSubMenu = None
    if fMask & win32con.MIIM_CHECKMARKS == 0:
        hbmpChecked = hbmpUnchecked = None
    if fMask & win32con.MIIM_DATA == 0:
        dwItemData = None
    if fMask & win32con.MIIM_BITMAP == 0:
        hbmpItem = None
    if fMask & win32con.MIIM_STRING:
        text = win32gui.PyGetString(lptext, cch)
    else:
        text = None
    return _MakeResult(
        "MENUITEMINFO fType fState wID hSubMenu hbmpChecked "
        "hbmpUnchecked dwItemData text hbmpItem",
        (
            fType,
            fState,
            wID,
            hSubMenu,
            hbmpChecked,
            hbmpUnchecked,
            dwItemData,
            text,
            hbmpItem,
        ),
    )


def EmptyMENUITEMINFO(mask=None, text_buf_size=512):
    # text_buf_size is number of *characters* - not necessarily no of bytes.
    extra = []
    if mask is None:
        mask = (
            win32con.MIIM_BITMAP
            | win32con.MIIM_CHECKMARKS
            | win32con.MIIM_DATA
            | win32con.MIIM_FTYPE
            | win32con.MIIM_ID
            | win32con.MIIM_STATE
            | win32con.MIIM_STRING
            | win32con.MIIM_SUBMENU
        )
        # Note: No MIIM_TYPE - this screws win2k/98.

    if mask & win32con.MIIM_STRING:
        text_buffer = _make_empty_text_buffer(text_buf_size)
        extra.append(text_buffer)
        text_addr, _ = text_buffer.buffer_info()
    else:
        text_addr = text_buf_size = 0

    # Now copy the string to a writable buffer, so that the result
    # could be passed to a 'Get' function
    buf = struct.pack(
        _menuiteminfo_fmt,
        struct.calcsize(_menuiteminfo_fmt),  # cbSize
        mask,
        0,  # fType,
        0,  # fState,
        0,  # wID,
        0,  # hSubMenu,
        0,  # hbmpChecked,
        0,  # hbmpUnchecked,
        0,  # dwItemData,
        text_addr,
        text_buf_size,
        0,  # hbmpItem
    )
    return array.array("b", buf), extra


# MENUINFO struct
_menuinfo_fmt = "iiiiPiP"


def PackMENUINFO(
    dwStyle=None,
    cyMax=None,
    hbrBack=None,
    dwContextHelpID=None,
    dwMenuData=None,
    fMask=0,
):
    if dwStyle is None:
        dwStyle = 0
    else:
        fMask |= win32con.MIM_STYLE
    if cyMax is None:
        cyMax = 0
    else:
        fMask |= win32con.MIM_MAXHEIGHT
    if hbrBack is None:
        hbrBack = 0
    else:
        fMask |= win32con.MIM_BACKGROUND
    if dwContextHelpID is None:
        dwContextHelpID = 0
    else:
        fMask |= win32con.MIM_HELPID
    if dwMenuData is None:
        dwMenuData = 0
    else:
        fMask |= win32con.MIM_MENUDATA
    # Create the struct.
    item = struct.pack(
        _menuinfo_fmt,
        struct.calcsize(_menuinfo_fmt),  # cbSize
        fMask,
        dwStyle,
        cyMax,
        hbrBack,
        dwContextHelpID,
        dwMenuData,
    )
    return array.array("b", item)


def UnpackMENUINFO(s):
    (cb, fMask, dwStyle, cyMax, hbrBack, dwContextHelpID, dwMenuData) = struct.unpack(
        _menuinfo_fmt, s
    )
    assert cb == len(s)
    if fMask & win32con.MIM_STYLE == 0:
        dwStyle = None
    if fMask & win32con.MIM_MAXHEIGHT == 0:
        cyMax = None
    if fMask & win32con.MIM_BACKGROUND == 0:
        hbrBack = None
    if fMask & win32con.MIM_HELPID == 0:
        dwContextHelpID = None
    if fMask & win32con.MIM_MENUDATA == 0:
        dwMenuData = None
    return _MakeResult(
        "MENUINFO dwStyle cyMax hbrBack dwContextHelpID dwMenuData",
        (dwStyle, cyMax, hbrBack, dwContextHelpID, dwMenuData),
    )


def EmptyMENUINFO(mask=None):
    if mask is None:
        mask = (
            win32con.MIM_STYLE
            | win32con.MIM_MAXHEIGHT
            | win32con.MIM_BACKGROUND
            | win32con.MIM_HELPID
            | win32con.MIM_MENUDATA
        )

    buf = struct.pack(
        _menuinfo_fmt,
        struct.calcsize(_menuinfo_fmt),  # cbSize
        mask,
        0,  # dwStyle
        0,  # cyMax
        0,  # hbrBack,
        0,  # dwContextHelpID,
        0,  # dwMenuData,
    )
    return array.array("b", buf)


##########################################################################
#
# Tree View structure support - TVITEM, TVINSERTSTRUCT and TVDISPINFO
#
##########################################################################

# XXX - Note that the following implementation of TreeView structures is ripped
# XXX - from the SpamBayes project.  It may not quite work correctly yet - I
# XXX - intend checking them later - but having them is better than not at all!

_tvitem_fmt = "iPiiPiiiiP"
# Helpers for the ugly win32 structure packing/unpacking
# XXX - Note that functions using _GetMaskAndVal run 3x faster if they are
# 'inlined' into the function - see PackLVITEM.  If the profiler points at
# _GetMaskAndVal(), you should nuke it (patches welcome once they have been
# tested)
def _GetMaskAndVal(val, default, mask, flag):
    if val is None:
        return mask, default
    else:
        if flag is not None:
            mask |= flag
        return mask, val


def PackTVINSERTSTRUCT(parent, insertAfter, tvitem):
    tvitem_buf, extra = PackTVITEM(*tvitem)
    tvitem_buf = tvitem_buf.tobytes()
    format = "PP%ds" % len(tvitem_buf)
    return struct.pack(format, parent, insertAfter, tvitem_buf), extra


def PackTVITEM(hitem, state, stateMask, text, image, selimage, citems, param):
    extra = []  # objects we must keep references to
    mask = 0
    mask, hitem = _GetMaskAndVal(hitem, 0, mask, commctrl.TVIF_HANDLE)
    mask, state = _GetMaskAndVal(state, 0, mask, commctrl.TVIF_STATE)
    if not mask & commctrl.TVIF_STATE:
        stateMask = 0
    mask, text = _GetMaskAndVal(text, None, mask, commctrl.TVIF_TEXT)
    mask, image = _GetMaskAndVal(image, 0, mask, commctrl.TVIF_IMAGE)
    mask, selimage = _GetMaskAndVal(selimage, 0, mask, commctrl.TVIF_SELECTEDIMAGE)
    mask, citems = _GetMaskAndVal(citems, 0, mask, commctrl.TVIF_CHILDREN)
    mask, param = _GetMaskAndVal(param, 0, mask, commctrl.TVIF_PARAM)
    if text is None:
        text_addr = text_len = 0
    else:
        text_buffer = _make_text_buffer(text)
        text_len = len(text)
        extra.append(text_buffer)
        text_addr, _ = text_buffer.buffer_info()
    buf = struct.pack(
        _tvitem_fmt,
        mask,
        hitem,
        state,
        stateMask,
        text_addr,
        text_len,  # text
        image,
        selimage,
        citems,
        param,
    )
    return array.array("b", buf), extra


# Make a new buffer suitable for querying hitem's attributes.
def EmptyTVITEM(hitem, mask=None, text_buf_size=512):
    extra = []  # objects we must keep references to
    if mask is None:
        mask = (
            commctrl.TVIF_HANDLE
            | commctrl.TVIF_STATE
            | commctrl.TVIF_TEXT
            | commctrl.TVIF_IMAGE
            | commctrl.TVIF_SELECTEDIMAGE
            | commctrl.TVIF_CHILDREN
            | commctrl.TVIF_PARAM
        )
    if mask & commctrl.TVIF_TEXT:
        text_buffer = _make_empty_text_buffer(text_buf_size)
        extra.append(text_buffer)
        text_addr, _ = text_buffer.buffer_info()
    else:
        text_addr = text_buf_size = 0
    buf = struct.pack(
        _tvitem_fmt, mask, hitem, 0, 0, text_addr, text_buf_size, 0, 0, 0, 0  # text
    )
    return array.array("b", buf), extra


def UnpackTVITEM(buffer):
    (
        item_mask,
        item_hItem,
        item_state,
        item_stateMask,
        item_textptr,
        item_cchText,
        item_image,
        item_selimage,
        item_cChildren,
        item_param,
    ) = struct.unpack(_tvitem_fmt, buffer)
    # ensure only items listed by the mask are valid (except we assume the
    # handle is always valid - some notifications (eg, TVN_ENDLABELEDIT) set a
    # mask that doesn't include the handle, but the docs explicity say it is.)
    if not (item_mask & commctrl.TVIF_TEXT):
        item_textptr = item_cchText = None
    if not (item_mask & commctrl.TVIF_CHILDREN):
        item_cChildren = None
    if not (item_mask & commctrl.TVIF_IMAGE):
        item_image = None
    if not (item_mask & commctrl.TVIF_PARAM):
        item_param = None
    if not (item_mask & commctrl.TVIF_SELECTEDIMAGE):
        item_selimage = None
    if not (item_mask & commctrl.TVIF_STATE):
        item_state = item_stateMask = None

    if item_textptr:
        text = win32gui.PyGetString(item_textptr)
    else:
        text = None
    return _MakeResult(
        "TVITEM item_hItem item_state item_stateMask "
        "text item_image item_selimage item_cChildren item_param",
        (
            item_hItem,
            item_state,
            item_stateMask,
            text,
            item_image,
            item_selimage,
            item_cChildren,
            item_param,
        ),
    )


# Unpack the lparm from a "TVNOTIFY" message
def UnpackTVNOTIFY(lparam):
    item_size = struct.calcsize(_tvitem_fmt)
    format = _nmhdr_fmt + _nmhdr_align_padding
    if is64bit:
        format = format + "ixxxx"
    else:
        format = format + "i"
    format = format + "%ds%ds" % (item_size, item_size)
    buf = win32gui.PyGetMemory(lparam, struct.calcsize(format))
    hwndFrom, id, code, action, buf_old, buf_new = struct.unpack(format, buf)
    item_old = UnpackTVITEM(buf_old)
    item_new = UnpackTVITEM(buf_new)
    return _MakeResult(
        "TVNOTIFY hwndFrom id code action item_old item_new",
        (hwndFrom, id, code, action, item_old, item_new),
    )


def UnpackTVDISPINFO(lparam):
    item_size = struct.calcsize(_tvitem_fmt)
    format = "PPi%ds" % (item_size,)
    buf = win32gui.PyGetMemory(lparam, struct.calcsize(format))
    hwndFrom, id, code, buf_item = struct.unpack(format, buf)
    item = UnpackTVITEM(buf_item)
    return _MakeResult("TVDISPINFO hwndFrom id code item", (hwndFrom, id, code, item))


#
# List view items
_lvitem_fmt = "iiiiiPiiPi"


def PackLVITEM(
    item=None,
    subItem=None,
    state=None,
    stateMask=None,
    text=None,
    image=None,
    param=None,
    indent=None,
):
    extra = []  # objects we must keep references to
    mask = 0
    # _GetMaskAndVal adds quite a bit of overhead to this function.
    if item is None:
        item = 0  # No mask for item
    if subItem is None:
        subItem = 0  # No mask for sibItem
    if state is None:
        state = 0
        stateMask = 0
    else:
        mask |= commctrl.LVIF_STATE
        if stateMask is None:
            stateMask = state

    if image is None:
        image = 0
    else:
        mask |= commctrl.LVIF_IMAGE
    if param is None:
        param = 0
    else:
        mask |= commctrl.LVIF_PARAM
    if indent is None:
        indent = 0
    else:
        mask |= commctrl.LVIF_INDENT

    if text is None:
        text_addr = text_len = 0
    else:
        mask |= commctrl.LVIF_TEXT
        text_buffer = _make_text_buffer(text)
        text_len = len(text)
        extra.append(text_buffer)
        text_addr, _ = text_buffer.buffer_info()
    buf = struct.pack(
        _lvitem_fmt,
        mask,
        item,
        subItem,
        state,
        stateMask,
        text_addr,
        text_len,  # text
        image,
        param,
        indent,
    )
    return array.array("b", buf), extra


def UnpackLVITEM(buffer):
    (
        item_mask,
        item_item,
        item_subItem,
        item_state,
        item_stateMask,
        item_textptr,
        item_cchText,
        item_image,
        item_param,
        item_indent,
    ) = struct.unpack(_lvitem_fmt, buffer)
    # ensure only items listed by the mask are valid
    if not (item_mask & commctrl.LVIF_TEXT):
        item_textptr = item_cchText = None
    if not (item_mask & commctrl.LVIF_IMAGE):
        item_image = None
    if not (item_mask & commctrl.LVIF_PARAM):
        item_param = None
    if not (item_mask & commctrl.LVIF_INDENT):
        item_indent = None
    if not (item_mask & commctrl.LVIF_STATE):
        item_state = item_stateMask = None

    if item_textptr:
        text = win32gui.PyGetString(item_textptr)
    else:
        text = None
    return _MakeResult(
        "LVITEM item_item item_subItem item_state "
        "item_stateMask text item_image item_param item_indent",
        (
            item_item,
            item_subItem,
            item_state,
            item_stateMask,
            text,
            item_image,
            item_param,
            item_indent,
        ),
    )


# Unpack an "LVNOTIFY" message
def UnpackLVDISPINFO(lparam):
    item_size = struct.calcsize(_lvitem_fmt)
    format = _nmhdr_fmt + _nmhdr_align_padding + ("%ds" % (item_size,))
    buf = win32gui.PyGetMemory(lparam, struct.calcsize(format))
    hwndFrom, id, code, buf_item = struct.unpack(format, buf)
    item = UnpackLVITEM(buf_item)
    return _MakeResult("LVDISPINFO hwndFrom id code item", (hwndFrom, id, code, item))


def UnpackLVNOTIFY(lparam):
    format = _nmhdr_fmt + _nmhdr_align_padding + "7i"
    if is64bit:
        format = format + "xxxx"  # point needs padding.
    format = format + "P"
    buf = win32gui.PyGetMemory(lparam, struct.calcsize(format))
    (
        hwndFrom,
        id,
        code,
        item,
        subitem,
        newstate,
        oldstate,
        changed,
        pt_x,
        pt_y,
        lparam,
    ) = struct.unpack(format, buf)
    return _MakeResult(
        "UnpackLVNOTIFY hwndFrom id code item subitem "
        "newstate oldstate changed pt lparam",
        (
            hwndFrom,
            id,
            code,
            item,
            subitem,
            newstate,
            oldstate,
            changed,
            (pt_x, pt_y),
            lparam,
        ),
    )


# Make a new buffer suitable for querying an items attributes.
def EmptyLVITEM(item, subitem, mask=None, text_buf_size=512):
    extra = []  # objects we must keep references to
    if mask is None:
        mask = (
            commctrl.LVIF_IMAGE
            | commctrl.LVIF_INDENT
            | commctrl.LVIF_TEXT
            | commctrl.LVIF_PARAM
            | commctrl.LVIF_STATE
        )
    if mask & commctrl.LVIF_TEXT:
        text_buffer = _make_empty_text_buffer(text_buf_size)
        extra.append(text_buffer)
        text_addr, _ = text_buffer.buffer_info()
    else:
        text_addr = text_buf_size = 0
    buf = struct.pack(
        _lvitem_fmt,
        mask,
        item,
        subitem,
        0,
        0,
        text_addr,
        text_buf_size,  # text
        0,
        0,
        0,
    )
    return array.array("b", buf), extra


# List view column structure
_lvcolumn_fmt = "iiiPiiii"


def PackLVCOLUMN(fmt=None, cx=None, text=None, subItem=None, image=None, order=None):
    extra = []  # objects we must keep references to
    mask = 0
    mask, fmt = _GetMaskAndVal(fmt, 0, mask, commctrl.LVCF_FMT)
    mask, cx = _GetMaskAndVal(cx, 0, mask, commctrl.LVCF_WIDTH)
    mask, text = _GetMaskAndVal(text, None, mask, commctrl.LVCF_TEXT)
    mask, subItem = _GetMaskAndVal(subItem, 0, mask, commctrl.LVCF_SUBITEM)
    mask, image = _GetMaskAndVal(image, 0, mask, commctrl.LVCF_IMAGE)
    mask, order = _GetMaskAndVal(order, 0, mask, commctrl.LVCF_ORDER)
    if text is None:
        text_addr = text_len = 0
    else:
        text_buffer = _make_text_buffer(text)
        extra.append(text_buffer)
        text_addr, _ = text_buffer.buffer_info()
        text_len = len(text)
    buf = struct.pack(
        _lvcolumn_fmt, mask, fmt, cx, text_addr, text_len, subItem, image, order  # text
    )
    return array.array("b", buf), extra


def UnpackLVCOLUMN(lparam):
    mask, fmt, cx, text_addr, text_size, subItem, image, order = struct.unpack(
        _lvcolumn_fmt, lparam
    )
    # ensure only items listed by the mask are valid
    if not (mask & commctrl.LVCF_FMT):
        fmt = None
    if not (mask & commctrl.LVCF_WIDTH):
        cx = None
    if not (mask & commctrl.LVCF_TEXT):
        text_addr = text_size = None
    if not (mask & commctrl.LVCF_SUBITEM):
        subItem = None
    if not (mask & commctrl.LVCF_IMAGE):
        image = None
    if not (mask & commctrl.LVCF_ORDER):
        order = None
    if text_addr:
        text = win32gui.PyGetString(text_addr)
    else:
        text = None
    return _MakeResult(
        "LVCOLUMN fmt cx text subItem image order",
        (fmt, cx, text, subItem, image, order),
    )


# Make a new buffer suitable for querying an items attributes.
def EmptyLVCOLUMN(mask=None, text_buf_size=512):
    extra = []  # objects we must keep references to
    if mask is None:
        mask = (
            commctrl.LVCF_FMT
            | commctrl.LVCF_WIDTH
            | commctrl.LVCF_TEXT
            | commctrl.LVCF_SUBITEM
            | commctrl.LVCF_IMAGE
            | commctrl.LVCF_ORDER
        )
    if mask & commctrl.LVCF_TEXT:
        text_buffer = _make_empty_text_buffer(text_buf_size)
        extra.append(text_buffer)
        text_addr, _ = text_buffer.buffer_info()
    else:
        text_addr = text_buf_size = 0
    buf = struct.pack(
        _lvcolumn_fmt, mask, 0, 0, text_addr, text_buf_size, 0, 0, 0  # text
    )
    return array.array("b", buf), extra


# List view hit-test.
def PackLVHITTEST(pt):
    format = "iiiii"
    buf = struct.pack(format, pt[0], pt[1], 0, 0, 0)
    return array.array("b", buf), None


def UnpackLVHITTEST(buf):
    format = "iiiii"
    x, y, flags, item, subitem = struct.unpack(format, buf)
    return _MakeResult(
        "LVHITTEST pt flags item subitem", ((x, y), flags, item, subitem)
    )


def PackHDITEM(
    cxy=None, text=None, hbm=None, fmt=None, param=None, image=None, order=None
):
    extra = []  # objects we must keep references to
    mask = 0
    mask, cxy = _GetMaskAndVal(cxy, 0, mask, commctrl.HDI_HEIGHT)
    mask, text = _GetMaskAndVal(text, None, mask, commctrl.LVCF_TEXT)
    mask, hbm = _GetMaskAndVal(hbm, 0, mask, commctrl.HDI_BITMAP)
    mask, fmt = _GetMaskAndVal(fmt, 0, mask, commctrl.HDI_FORMAT)
    mask, param = _GetMaskAndVal(param, 0, mask, commctrl.HDI_LPARAM)
    mask, image = _GetMaskAndVal(image, 0, mask, commctrl.HDI_IMAGE)
    mask, order = _GetMaskAndVal(order, 0, mask, commctrl.HDI_ORDER)

    if text is None:
        text_addr = text_len = 0
    else:
        text_buffer = _make_text_buffer(text)
        extra.append(text_buffer)
        text_addr, _ = text_buffer.buffer_info()
        text_len = len(text)

    format = "iiPPiiPiiii"
    buf = struct.pack(
        format, mask, cxy, text_addr, hbm, text_len, fmt, param, image, order, 0, 0
    )
    return array.array("b", buf), extra


# Device notification stuff

# Generic function for packing a DEV_BROADCAST_* structure - generally used
# by the other PackDEV_BROADCAST_* functions in this module.
def PackDEV_BROADCAST(devicetype, rest_fmt, rest_data, extra_data=_make_bytes("")):
    # It seems a requirement is 4 byte alignment, even for the 'BYTE data[1]'
    # field (eg, that would make DEV_BROADCAST_HANDLE 41 bytes, but we must
    # be 44.
    extra_data += _make_bytes("\0" * (4 - len(extra_data) % 4))
    format = "iii" + rest_fmt
    full_size = struct.calcsize(format) + len(extra_data)
    data = (full_size, devicetype, 0) + rest_data
    return struct.pack(format, *data) + extra_data


def PackDEV_BROADCAST_HANDLE(
    handle,
    hdevnotify=0,
    guid=_make_bytes("\0" * 16),
    name_offset=0,
    data=_make_bytes("\0"),
):
    return PackDEV_BROADCAST(
        win32con.DBT_DEVTYP_HANDLE,
        "PP16sl",
        (int(handle), int(hdevnotify), _make_memory(guid), name_offset),
        data,
    )


def PackDEV_BROADCAST_VOLUME(unitmask, flags):
    return PackDEV_BROADCAST(win32con.DBT_DEVTYP_VOLUME, "II", (unitmask, flags))


def PackDEV_BROADCAST_DEVICEINTERFACE(classguid, name=""):
    if win32gui.UNICODE:
        # This really means "is py3k?" - so not accepting bytes is OK
        if not isinstance(name, str):
            raise TypeError("Must provide unicode for the name")
        name = name.encode("utf-16le")
    else:
        # py2k was passed a unicode object - encode as mbcs.
        if isinstance(name, str):
            name = name.encode("mbcs")

    # 16 bytes for the IID followed by \0 term'd string.
    rest_fmt = "16s%ds" % len(name)
    # _make_memory(iid) hoops necessary to get the raw IID bytes.
    rest_data = (_make_memory(pywintypes.IID(classguid)), name)
    return PackDEV_BROADCAST(win32con.DBT_DEVTYP_DEVICEINTERFACE, rest_fmt, rest_data)


# An object returned by UnpackDEV_BROADCAST.
class DEV_BROADCAST_INFO:
    def __init__(self, devicetype, **kw):
        self.devicetype = devicetype
        self.__dict__.update(kw)

    def __str__(self):
        return "DEV_BROADCAST_INFO:" + str(self.__dict__)


# Support for unpacking the 'lparam'
def UnpackDEV_BROADCAST(lparam):
    if lparam == 0:
        return None
    hdr_format = "iii"
    hdr_size = struct.calcsize(hdr_format)
    hdr_buf = win32gui.PyGetMemory(lparam, hdr_size)
    size, devtype, reserved = struct.unpack("iii", hdr_buf)
    # Due to x64 alignment issues, we need to use the full format string over
    # the entire buffer.  ie, on x64:
    # calcsize('iiiP') != calcsize('iii')+calcsize('P')
    buf = win32gui.PyGetMemory(lparam, size)

    extra = x = {}
    if devtype == win32con.DBT_DEVTYP_HANDLE:
        # 2 handles, a GUID, a LONG and possibly an array following...
        fmt = hdr_format + "PP16sl"
        (
            _,
            _,
            _,
            x["handle"],
            x["hdevnotify"],
            guid_bytes,
            x["nameoffset"],
        ) = struct.unpack(fmt, buf[: struct.calcsize(fmt)])
        x["eventguid"] = pywintypes.IID(guid_bytes, True)
    elif devtype == win32con.DBT_DEVTYP_DEVICEINTERFACE:
        fmt = hdr_format + "16s"
        _, _, _, guid_bytes = struct.unpack(fmt, buf[: struct.calcsize(fmt)])
        x["classguid"] = pywintypes.IID(guid_bytes, True)
        x["name"] = win32gui.PyGetString(lparam + struct.calcsize(fmt))
    elif devtype == win32con.DBT_DEVTYP_VOLUME:
        # int mask and flags
        fmt = hdr_format + "II"
        _, _, _, x["unitmask"], x["flags"] = struct.unpack(
            fmt, buf[: struct.calcsize(fmt)]
        )
    else:
        raise NotImplementedError("unknown device type %d" % (devtype,))
    return DEV_BROADCAST_INFO(devtype, **extra)

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