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# A sample shell column provider
# Mainly ported from MSDN article:
# Using Shell Column Handlers for Detailed File Information,
# Raymond Chen, Microsoft Corporation, February 2000
#
# To demostrate:
# * Execute this script to register the namespace.
# * Open Windows Explorer
# * Right-click an explorer column header - select "More"
# * Locate column 'pyc size' or 'pyo size', and add it to the view.
# This handler is providing that column data.
import sys, os, stat
import pythoncom
from win32com.shell import shell, shellcon
import commctrl
import winerror
from win32com.server.util import wrap
from pywintypes import IID
IPersist_Methods = ["GetClassID"]
IColumnProvider_Methods = IPersist_Methods + \
["Initialize", "GetColumnInfo", "GetItemData"]
class ColumnProvider:
_reg_progid_ = "Python.ShellExtension.ColumnProvider"
_reg_desc_ = "Python Sample Shell Extension (Column Provider)"
_reg_clsid_ = IID("{0F14101A-E05E-4070-BD54-83DFA58C3D68}")
_com_interfaces_ = [pythoncom.IID_IPersist,
shell.IID_IColumnProvider,
]
_public_methods_ = IColumnProvider_Methods
# IPersist
def GetClassID(self):
return self._reg_clsid_
# IColumnProvider
def Initialize(self, colInit):
flags, reserved, name = colInit
print("ColumnProvider initializing for file", name)
def GetColumnInfo(self, index):
# We support exactly 2 columns - 'pyc size' and 'pyo size'
if index in [0,1]:
# As per the MSDN sample, use our CLSID as the fmtid
if index==0:
ext = ".pyc"
else:
ext = ".pyo"
title = ext + " size"
description = "Size of compiled %s file" % ext
col_id = (self._reg_clsid_, # fmtid
index) # pid
col_info = (
col_id, # scid
pythoncom.VT_I4, # vt
commctrl.LVCFMT_RIGHT, # fmt
20, #cChars
shellcon.SHCOLSTATE_TYPE_INT | \
shellcon.SHCOLSTATE_SECONDARYUI, # csFlags
title,
description)
return col_info
return None # Indicate no more columns.
def GetItemData(self, colid, colData):
fmt_id, pid = colid
fmt_id==self._reg_clsid_
flags, attr, reserved, ext, name = colData
if ext.lower() not in [".py", ".pyw"]:
return None
if pid==0:
ext = ".pyc"
else:
ext = ".pyo"
check_file = os.path.splitext(name)[0] + ext
try:
st = os.stat(check_file)
return st[stat.ST_SIZE]
except OSError:
# No file
return None
def DllRegisterServer():
import winreg
# Special ColumnProvider key
key = winreg.CreateKey(winreg.HKEY_CLASSES_ROOT,
"Folder\\ShellEx\\ColumnHandlers\\" + \
str(ColumnProvider._reg_clsid_ ))
winreg.SetValueEx(key, None, 0, winreg.REG_SZ, ColumnProvider._reg_desc_)
print(ColumnProvider._reg_desc_, "registration complete.")
def DllUnregisterServer():
import winreg
try:
key = winreg.DeleteKey(winreg.HKEY_CLASSES_ROOT,
"Folder\\ShellEx\\ColumnHandlers\\" + \
str(ColumnProvider._reg_clsid_) )
except WindowsError as details:
import errno
if details.errno != errno.ENOENT:
raise
print(ColumnProvider._reg_desc_, "unregistration complete.")
if __name__=='__main__':
from win32com.server import register
register.UseCommandLine(ColumnProvider,
finalize_register = DllRegisterServer,
finalize_unregister = DllUnregisterServer)