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# A sample icon handler. Sets the icon for Python files to a random
# ICO file. ICO files are found in the Python directory - generally there will
# be 3 icons found.
#
# To demostrate:
# * Execute this script to register the context menu.
# * Open Windows Explorer, and browse to a directory with a .py file.
# * Note the pretty, random selection of icons!
import sys, os
import pythoncom
from win32com.shell import shell, shellcon
import win32gui
import win32con
import winerror
# Use glob to locate ico files, and random.choice to pick one.
import glob, random
ico_files = glob.glob(os.path.join(sys.prefix, "*.ico"))
if not ico_files:
ico_files = glob.glob(os.path.join(sys.prefix, "PC", "*.ico"))
if not ico_files:
print("WARNING: Can't find any icon files")
# Our shell extension.
IExtractIcon_Methods = "Extract GetIconLocation".split()
IPersistFile_Methods = "IsDirty Load Save SaveCompleted GetCurFile".split()
class ShellExtension:
_reg_progid_ = "Python.ShellExtension.IconHandler"
_reg_desc_ = "Python Sample Shell Extension (icon handler)"
_reg_clsid_ = "{a97e32d7-3b78-448c-b341-418120ea9227}"
_com_interfaces_ = [shell.IID_IExtractIcon, pythoncom.IID_IPersistFile]
_public_methods_ = IExtractIcon_Methods + IPersistFile_Methods
def Load(self, filename, mode):
self.filename = filename
self.mode = mode
def GetIconLocation(self, flags):
# note - returning a single int will set the HRESULT (eg, S_FALSE,
# E_PENDING - see MS docs for details.
return random.choice(ico_files), 0, 0
def Extract(self, fname, index, size):
return winerror.S_FALSE
def DllRegisterServer():
import winreg
key = winreg.CreateKey(winreg.HKEY_CLASSES_ROOT,
"Python.File\\shellex")
subkey = winreg.CreateKey(key, "IconHandler")
winreg.SetValueEx(subkey, None, 0, winreg.REG_SZ, ShellExtension._reg_clsid_)
print(ShellExtension._reg_desc_, "registration complete.")
def DllUnregisterServer():
import winreg
try:
key = winreg.DeleteKey(winreg.HKEY_CLASSES_ROOT,
"Python.File\\shellex\\IconHandler")
except WindowsError as details:
import errno
if details.errno != errno.ENOENT:
raise
print(ShellExtension._reg_desc_, "unregistration complete.")
if __name__=='__main__':
from win32com.server import register
register.UseCommandLine(ShellExtension,
finalize_register = DllRegisterServer,
finalize_unregister = DllUnregisterServer)