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win32gui_struct.py
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2003-10-15
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# 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.
import win32gui
import win32con
import struct
import array
# 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)
menuitem_fmt = '9IP2I'
def PackMENUITEMINFO(fType=None, fState=None, wID=None, hSubMenu=None,
hbmpChecked=None, hbmpUnchecked=None, dwTypeData=None,
text=None, hbmpItem=None):
# 'extras' are objects the caller must keep a reference to (as their
# memory is used) for the lifetime of the INFO item.
extras = []
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.MMIM_CHECKMARKS
if dwTypeData is None: dwTypeData = 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 = array.array("c", text+'\0')
cch = len(str_buf)
# 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.
dwItemData = 0
item = struct.pack(
menuitem_fmt,
struct.calcsize(menuitem_fmt), # cbSize
fMask,
fType,
fState,
wID,
hSubMenu,
hbmpChecked,
hbmpUnchecked,
dwItemData,
lptext,
cch,
hbmpItem
)
# Now copy the string to a writable buffer, so that the result
# could be passed to a 'Get' function
return array.array("c", item), extras
def UnpackMENUITEMINFO(s):
cb,
fMask,
fType,
fState,
wID,
hSubMenu,
hbmpChecked,
hbmpUnchecked,
dwItemData,
lptext,
cch,
hbmpItem = struct.unpack(menuitem_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 = PyGetString(lptext, cch)
else:
text = None
return fType, fState, wID, hSubMenu, bmpChecked, bmpUnchecked, \
dwTypeData, text, hbmpItem
##########################################################################
#
# 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!
# Helpers for the ugly win32 structure packing/unpacking
def _GetMaskAndVal(val, default, mask, flag):
if val is None:
return mask, default
else:
mask |= flag
return mask, val
def PackTVINSERTSTRUCT(parent, insertAfter, tvitem):
tvitem_buf, extra = PackTVITEM(*tvitem)
tvitem_buf = tvitem_buf.tostring()
format = "ii%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 = array.array("c", text+"\0")
extra.append(text_buffer)
text_addr, text_len = text_buffer.buffer_info()
format = "iiiiiiiiii"
buf = struct.pack(format,
mask, hitem,
state, stateMask,
text_addr, text_len, # text
image, selimage,
citems, param)
return array.array("c", 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 = array.array("c", "\0" * text_buf_size)
extra.append(text_buffer)
text_addr, text_len = text_buffer.buffer_info()
else:
text_addr = text_len = 0
format = "iiiiiiiiii"
buf = struct.pack(format,
mask, hitem,
0, 0,
text_addr, text_len, # text
0, 0,
0, 0)
return array.array("c", 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("10i", 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 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):
format = "iiii40s40s"
buf = win32gui.PyMakeBuffer(struct.calcsize(format), lparam)
hwndFrom, id, code, action, buf_old, buf_new \
= struct.unpack(format, buf)
item_old = UnpackTVItem(buf_old)
item_new = UnpackTVItem(buf_new)
return hwndFrom, id, code, action, item_old, item_new
def UnpackTVDISPINFO(lparam):
format = "iii40s"
buf = win32gui.PyMakeBuffer(struct.calcsize(format), lparam)
hwndFrom, id, code, buf_item = struct.unpack(format, buf)
item = UnpackTVItem(buf_item)
return hwndFrom, id, code, item