# A sample shell copy hook.

# To demostrate:
# * Execute this script to register the context menu.
# * Open Windows Explorer
# * Attempt to move or copy a directory.
# * Note our hook's dialog is displayed.
import sys, os
import pythoncom
from win32com.shell import shell, shellcon
import win32gui
import win32con
import winerror

# Our shell extension.
class ShellExtension:
    _reg_progid_ = "Python.ShellExtension.CopyHook"
    _reg_desc_ = "Python Sample Shell Extension (copy hook)"
    _reg_clsid_ = "{1845b6ba-2bbd-4197-b930-46d8651497c1}"
    _com_interfaces_ = [shell.IID_ICopyHook]
    _public_methods_ = ["CopyCallBack"]
    
    def CopyCallBack(self, hwnd, func, flags,
                     srcName, srcAttr, destName, destAttr):
        # This function should return:
        # IDYES Allows the operation. 
        # IDNO Prevents the operation on this folder but continues with any other operations that have been approved (for example, a batch copy operation).  
        # IDCANCEL Prevents the current operation and cancels any pending operations.  
        print("CopyCallBack", hwnd, func, flags, srcName, srcAttr, destName, destAttr)
        return win32gui.MessageBox(hwnd, "Allow operation?", "CopyHook",
                                   win32con.MB_YESNO)

def DllRegisterServer():
    import winreg
    key = winreg.CreateKey(winreg.HKEY_CLASSES_ROOT,
                            "directory\\shellex\\CopyHookHandlers\\" +
                            ShellExtension._reg_desc_)
    winreg.SetValueEx(key, None, 0, winreg.REG_SZ, ShellExtension._reg_clsid_)
    key = winreg.CreateKey(winreg.HKEY_CLASSES_ROOT,
                            "*\\shellex\\CopyHookHandlers\\" +
                            ShellExtension._reg_desc_)
    winreg.SetValueEx(key, 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,
                                "directory\\shellex\\CopyHookHandlers\\" +
                            ShellExtension._reg_desc_)
    except WindowsError as details:
        import errno
        if details.errno != errno.ENOENT:
            raise
    try:
        key = winreg.DeleteKey(winreg.HKEY_CLASSES_ROOT,
                                "*\\shellex\\CopyHookHandlers\\" +
                            ShellExtension._reg_desc_)
    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)
#!/usr/bin/env python