Clean up usage of app uids on windows

src/calibre/gui2/__init__.py

@@ -812,7 +812,13 @@ class Application(QApplication):
 
     shutdown_signal_received = pyqtSignal()
 
-    def __init__(self, args, force_calibre_style=False, override_program_name=None, headless=False, color_prefs=gprefs):
+    def __init__(self, args, force_calibre_style=False, override_program_name=None, headless=False, color_prefs=gprefs, windows_app_uid=None):
+        if iswindows:
+            self.windows_app_uid = None
+            if windows_app_uid:
+                windows_app_uid = unicode_type(windows_app_uid)
+                if set_app_uid(windows_app_uid):
+                    self.windows_app_uid = windows_app_uid
         self.file_event_hook = None
         if isfrozen and QT_VERSION <= 0x050700 and 'wayland' in os.environ.get('QT_QPA_PLATFORM', ''):
             os.environ['QT_QPA_PLATFORM'] = 'xcb'
@@ -1343,25 +1349,6 @@ empty_model = QStringListModel([''])
 empty_index = empty_model.index(0)
 
 
-def get_app_uid():
-    import ctypes
-    from ctypes import wintypes
-    lpBuffer = wintypes.LPWSTR()
-    try:
-        AppUserModelID = ctypes.windll.shell32.GetCurrentProcessExplicitAppUserModelID
-    except Exception:  # Vista has no app uids
-        return
-    AppUserModelID.argtypes = [wintypes.LPWSTR]
-    AppUserModelID.restype = wintypes.HRESULT
-    try:
-        AppUserModelID(ctypes.cast(ctypes.byref(lpBuffer), wintypes.LPWSTR))
-    except Exception:
-        return
-    appid = lpBuffer.value
-    ctypes.windll.ole32.CoTaskMemFree(lpBuffer)
-    return appid
-
-
 def set_app_uid(val):
     import ctypes
     from ctypes import wintypes
@@ -1380,5 +1367,5 @@ def set_app_uid(val):
 
 
 def add_to_recent_docs(path):
-    app_id = get_app_uid()
-    plugins['winutil'][0].add_to_recent_docs(unicode_type(path), app_id)
+    app = QApplication.instance()
+    plugins['winutil'][0].add_to_recent_docs(unicode_type(path), app.windows_app_uid)

src/calibre/gui2/main.py

@@ -20,7 +20,7 @@ from calibre.constants import (
 )
 from calibre.gui2 import (
     Application, choose_dir, error_dialog, gprefs, initialize_file_icon_provider,
-    question_dialog, set_app_uid, setup_gui_option_parser
+    question_dialog, setup_gui_option_parser
 )
 from calibre.gui2.main_window import option_parser as _option_parser
 from calibre.gui2.splash_screen import SplashScreen
@@ -111,7 +111,8 @@ def init_qt(args):
             prefs.set('library_path', os.path.abspath(libpath))
             prints('Using library at', prefs['library_path'])
     override = 'calibre-gui' if islinux else None
-    app = Application(args, override_program_name=override)
+    app = Application(args, override_program_name=override, windows_app_uid=MAIN_APP_UID)
+
     app.file_event_hook = EventAccumulator()
     try:
         is_x11 = app.platformName() == 'xcb'
@@ -519,12 +520,6 @@ def main(args=sys.argv):
         gui_debug = args[1]
         args = ['calibre']
 
-    if iswindows:
-        # Ensure that all ebook editor instances are grouped together in the task
-        # bar. This prevents them from being grouped with viewer process when
-        # launched from within calibre, as both use calibre-parallel.exe
-        set_app_uid(MAIN_APP_UID)
-
     try:
         app, opts, args = init_qt(args)
     except AbortInit:

src/calibre/gui2/tweak_book/main.py

@@ -9,9 +9,9 @@ import time
 
 from PyQt5.Qt import QIcon
 
-from calibre.constants import EDITOR_APP_UID, islinux, iswindows
+from calibre.constants import EDITOR_APP_UID, islinux
 from calibre.gui2 import (
-    Application, decouple, set_app_uid, set_gui_prefs, setup_gui_option_parser
+    Application, decouple, set_gui_prefs, setup_gui_option_parser
 )
 from calibre.ptempfile import reset_base_dir
 from calibre.utils.config import OptionParser
@@ -53,12 +53,6 @@ def _run(args, notify=None):
     os.environ.pop('CALIBRE_WORKER_TEMP_DIR', None)
     reset_base_dir()
 
-    if iswindows:
-        # Ensure that all ebook editor instances are grouped together in the task
-        # bar. This prevents them from being grouped with viewer process when
-        # launched from within calibre, as both use calibre-parallel.exe
-        set_app_uid(EDITOR_APP_UID)
-
     # The following two lines are needed to prevent circular imports causing
     # errors during initialization of plugins that use the polish container
     # infrastructure.
@@ -70,7 +64,7 @@ def _run(args, notify=None):
     opts, args = parser.parse_args(args)
     decouple('edit-book-'), set_gui_prefs(tprefs)
     override = 'calibre-edit-book' if islinux else None
-    app = Application(args, override_program_name=override, color_prefs=tprefs)
+    app = Application(args, override_program_name=override, color_prefs=tprefs, windows_app_uid=EDITOR_APP_UID)
     app.file_event_hook = EventAccumulator()
     app.load_builtin_fonts()
     app.setWindowIcon(QIcon(I('tweak.png')))

src/calibre/gui2/viewer/main.py

@@ -23,7 +23,7 @@ from calibre.customize.ui import available_input_formats
 from calibre.ebooks.oeb.iterator.book import EbookIterator
 from calibre.gui2 import (
     Application, add_to_recent_docs, choose_files, error_dialog, info_dialog,
-    open_url, set_app_uid, setup_gui_option_parser
+    open_url, setup_gui_option_parser
 )
 from calibre.gui2.viewer.toc import TOC
 from calibre.gui2.viewer.ui import Main as MainWindow
@@ -1309,11 +1309,6 @@ def main(args=sys.argv):
     # Ensure viewer can continue to function if GUI is closed
     os.environ.pop('CALIBRE_WORKER_TEMP_DIR', None)
     reset_base_dir()
-    if iswindows:
-        # Ensure that all ebook editor instances are grouped together in the task
-        # bar. This prevents them from being grouped with viewer process when
-        # launched from within calibre, as both use calibre-parallel.exe
-        set_app_uid(VIEWER_APP_UID)
 
     parser = option_parser()
     opts, args = parser.parse_args(args)
@@ -1326,7 +1321,7 @@ def main(args=sys.argv):
     listener = None
     override = 'calibre-ebook-viewer' if islinux else None
     acc = EventAccumulator()
-    app = Application(args, override_program_name=override, color_prefs=vprefs)
+    app = Application(args, override_program_name=override, color_prefs=vprefs, windows_app_uid=VIEWER_APP_UID)
     app.file_event_hook = acc
     app.load_builtin_fonts()
     app.setWindowIcon(QIcon(I('viewer.png')))