1 files changed, 66 insertions, 0 deletions
diff --git a/src/corelib/kernel/qfunctions_win.cpp b/src/corelib/kernel/qfunctions_win.cpp
new file mode 100644
index 0000000000..048fdbc934
--- /dev/null
+++ b/src/corelib/kernel/qfunctions_win.cpp
@@ -0,0 +1,66 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include "qfunctions_win_p.h"
+
+#include <QtCore/qdebug.h>
+
+#include <combaseapi.h>
+#include <objbase.h>
+
+#if __has_include(<appmodel.h>)
+#  include <appmodel.h>
+#  define HAS_APPMODEL
+#endif
+
+QT_BEGIN_NAMESPACE
+
+QComHelper::QComHelper(COINIT concurrencyModel)
+{
+    // Avoid overhead of initializing and using obsolete technology
+    concurrencyModel = COINIT(concurrencyModel | COINIT_DISABLE_OLE1DDE);
+
+    m_initResult = CoInitializeEx(nullptr, concurrencyModel);
+
+    if (FAILED(m_initResult))
+        qErrnoWarning(m_initResult, "Failed to initialize COM library");
+}
+
+QComHelper::~QComHelper()
+{
+    Q_ASSERT(m_threadId == GetCurrentThreadId());
+    if (SUCCEEDED(m_initResult))
+        CoUninitialize();
+}
+
+/*!
+    \internal
+    Checks if the application has a \e{package identity}
+
+    Having a \e{package identity} is required to use many modern
+    Windows APIs.
+
+    https://docs.microsoft.com/en-us/windows/apps/desktop/modernize/modernize-packaged-apps
+*/
+bool qt_win_hasPackageIdentity()
+{
+#if defined(HAS_APPMODEL)
+    static const bool hasPackageIdentity = []() {
+        UINT32 length = 0;
+        switch (const auto result = GetCurrentPackageFullName(&length, nullptr)) {
+        case ERROR_INSUFFICIENT_BUFFER:
+            return true;
+        case APPMODEL_ERROR_NO_PACKAGE:
+            return false;
+        default:
+            qWarning("Failed to resolve package identity (error code %ld)", result);
+            return false;
+        }
+    }();
+    return hasPackageIdentity;
+#else
+    return false;
+#endif
+}
+
+QT_END_NAMESPACE