1 files changed, 93 insertions, 0 deletions
diff --git a/examples/corelib/ipc/sharedmemory/dialog.py b/examples/corelib/ipc/sharedmemory/dialog.py
new file mode 100644
index 000000000..134900047
--- /dev/null
+++ b/examples/corelib/ipc/sharedmemory/dialog.py
@@ -0,0 +1,93 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+import os
+from pathlib import Path
+
+from PySide6.QtWidgets import QFileDialog, QDialog
+from PySide6.QtCore import QBuffer, QIODeviceBase, Slot, QSharedMemory, QDataStream, qVersion
+from PySide6.QtGui import QImage, QPixmap
+from ui_dialog import Ui_Dialog
+
+
+class Dialog(QDialog):
+    def __init__(self, parent=None):
+        super().__init__(parent)
+
+        v = qVersion()
+        name = f"QSharedMemoryExample_v{v}"
+        self._shared_memory = QSharedMemory(name)
+
+        self.ui = Ui_Dialog()
+        self.ui.setupUi(self)
+        self.ui.loadFromFileButton.clicked.connect(self.load_from_file)
+        self.ui.loadFromSharedMemoryButton.clicked.connect(self.load_from_memory)
+        self.setWindowTitle("SharedMemory Example")
+
+    def ensure_detached(self):
+        if self._shared_memory.isAttached():
+            self.detach()
+
+    def closeEvent(self, e):
+        self.ensure_detached()
+        e.accept()
+
+    @Slot()
+    def load_from_file(self):
+        self.ensure_detached()
+
+        self.ui.label.setText("Select an image file")
+        dir = Path(__file__).resolve().parent
+        fileName, _ = QFileDialog.getOpenFileName(self, "Choose Image",
+                                                  os.fspath(dir),
+                                                  "Images (*.png *.jpg)")
+        if not fileName:
+            return
+        image = QImage()
+        if not image.load(fileName):
+            self.ui.label.setText("Selected file is not an image, please select another.")
+            return
+        self.ui.label.setPixmap(QPixmap.fromImage(image))
+
+        # load into shared memory
+        buffer = QBuffer()
+        buffer.open(QIODeviceBase.WriteOnly)
+        out = QDataStream(buffer)
+        out << image
+        buffer.close()
+        size = buffer.size()
+
+        if not self._shared_memory.create(size):
+            self.ui.label.setText("Unable to create shared memory segment.")
+            return
+
+        self._shared_memory.lock()
+        _to = memoryview(self._shared_memory.data())
+        _from = buffer.data().data()
+        _to[0:size] = _from[0:size]
+        self._shared_memory.unlock()
+
+    @Slot()
+    def load_from_memory(self):
+        if not self._shared_memory.isAttached() and not self._shared_memory.attach():
+            self.ui.label.setText("Unable to attach to shared memory segment.\n"
+                                  "Load an image first.")
+            return
+
+        self._shared_memory.lock()
+        mv = memoryview(self._shared_memory.constData())
+        buffer = QBuffer()
+        buffer.setData(mv.tobytes())
+        buffer.open(QBuffer.ReadOnly)
+        _in = QDataStream(buffer)
+        image = QImage()
+        _in >> image
+        buffer.close()
+        self._shared_memory.unlock()
+        self._shared_memory.detach()
+
+        self.ui.label.setPixmap(QPixmap.fromImage(image))
+
+    def detach(self):
+        if not self._shared_memory.detach():
+            self.ui.label.setText(self.tr("Unable to detach from shared memory."))  # noqa: F821