Refactor taskbar progress using ctypes for ITaskbarList3

  - Remove comtypes dependency
  - Define ITaskbarList3 structure
  - Use CoCreateInstance for taskbar creation
  - Update progress methods to use ctypes
  - Add error handling for CoCreateInstance

DisplayCAL/taskbar.py

@@ -1,30 +1,56 @@
 # -*- coding: utf-8 -*-
 
-import comtypes.gen.TaskbarLib as tbl
-import comtypes.client as cc
-
+import ctypes
+from ctypes import wintypes
 
+# Constants for taskbar progress states
 TBPF_NOPROGRESS = 0
 TBPF_INDETERMINATE = 0x1
 TBPF_NORMAL = 0x2
 TBPF_ERROR = 0x4
 TBPF_PAUSED = 0x8
 
-taskbar = cc.CreateObject(
-    "{56FDF344-FD6D-11d0-958A-006097C9A090}", interface=tbl.ITaskbarList3
-)
-taskbar.HrInit()
+# Define the ITaskbarList3 interface
+class ITaskbarList3(ctypes.Structure):
+    _fields_ = [
+        ("SetProgressValue", ctypes.c_void_p),
+        ("SetProgressState", ctypes.c_void_p),
+        # Add other methods if needed
+    ]
+
+# Load the Shell32.dll and get the ITaskbarList3 interface
+shell32 = ctypes.windll.shell32
 
+ITaskbarList3_ptr = ctypes.POINTER(ITaskbarList3)
+CoCreateInstance = ctypes.windll.ole32.CoCreateInstance
+CLSID_TaskbarList = ctypes.c_char_p(b"{56FDF344-FD6D-11d0-958A-006097C9A090}")
+IID_ITaskbarList3 = ctypes.c_char_p(b"{EA1AFB91-9E28-4B86-90E9-9E9F8A5EEFAF}")
 
 class Taskbar(object):
     def __init__(self, frame, maxv=100):
         self.frame = frame
         self.maxv = maxv
+        self.taskbar = self._create_taskbar_instance()
+
+    def _create_taskbar_instance(self):
+        taskbar = ITaskbarList3_ptr()
+        hr = CoCreateInstance(
+            ctypes.byref(ctypes.c_void_p(CLSID_TaskbarList)),
+            None,
+            1,  # CLSCTX_INPROC_SERVER
+            ctypes.byref(IID_ITaskbarList3),
+            ctypes.byref(taskbar)
+        )
+        if hr != 0:
+            raise ctypes.WinError(hr)
+        return taskbar
 
     def set_progress_value(self, value):
         if self.frame:
-            taskbar.SetProgressValue(self.frame.GetHandle(), value, self.maxv)
+            hwnd = self.frame.GetHandle()
+            self.taskbar.contents.SetProgressValue(hwnd, value, self.maxv)
 
     def set_progress_state(self, state):
         if self.frame:
-            taskbar.SetProgressState(self.frame.GetHandle(), state)
+            hwnd = self.frame.GetHandle()
+            self.taskbar.contents.SetProgressState(hwnd, state)