qt 6.5.1 original

examples/widgets/tools/echoplugin/echowindow/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+qt_add_executable(echopluginwindow
+    echointerface.h
+    echowindow.cpp echowindow.h
+    main.cpp
+)
+
+set_target_properties(echopluginwindow PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(echopluginwindow PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Widgets
+)
+
+if(QT6_IS_SHARED_LIBS_BUILD)
+    # Build the shared plugin too when building this example target.
+    add_dependencies(echopluginwindow echoplugin)
+else()
+    # Link the echoplugin if Qt is built statically.
+    target_link_libraries(echopluginwindow PRIVATE
+        echoplugin
+    )
+endif()
+
+install(TARGETS echopluginwindow
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/widgets/tools/echoplugin/echowindow/echointerface.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef ECHOINTERFACE_H
+#define ECHOINTERFACE_H
+
+#include <QObject>
+#include <QString>
+
+//! [0]
+class EchoInterface
+{
+public:
+    virtual ~EchoInterface() = default;
+    virtual QString echo(const QString &message) = 0;
+};
+
+
+QT_BEGIN_NAMESPACE
+
+#define EchoInterface_iid "org.qt-project.Qt.Examples.EchoInterface"
+
+Q_DECLARE_INTERFACE(EchoInterface, EchoInterface_iid)
+QT_END_NAMESPACE
+
+//! [0]
+#endif

examples/widgets/tools/echoplugin/echowindow/echowindow.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "echowindow.h"
+
+#include <QCoreApplication>
+#include <QDir>
+#include <QLabel>
+#include <QLayout>
+#include <QLineEdit>
+#include <QMessageBox>
+#include <QPluginLoader>
+#include <QPushButton>
+
+//! [0]
+EchoWindow::EchoWindow()
+{
+    createGUI();
+    setLayout(layout);
+    setWindowTitle("Echo Plugin Example");
+
+    if (!loadPlugin()) {
+        QMessageBox::information(this, "Error", "Could not load the plugin");
+        lineEdit->setEnabled(false);
+        button->setEnabled(false);
+    }
+}
+//! [0]
+
+//! [1]
+void EchoWindow::sendEcho()
+{
+    QString text = echoInterface->echo(lineEdit->text());
+    label->setText(text);
+}
+//! [1]
+
+//! [2]
+void EchoWindow::createGUI()
+{
+    lineEdit = new QLineEdit;
+    label = new QLabel;
+    label->setFrameStyle(QFrame::Box | QFrame::Plain);
+    button = new QPushButton(tr("Send Message"));
+
+    connect(lineEdit, &QLineEdit::editingFinished,
+            this, &EchoWindow::sendEcho);
+    connect(button, &QPushButton::clicked,
+            this, &EchoWindow::sendEcho);
+
+    layout = new QGridLayout;
+    layout->addWidget(new QLabel(tr("Message:")), 0, 0);
+    layout->addWidget(lineEdit, 0, 1);
+    layout->addWidget(new QLabel(tr("Answer:")), 1, 0);
+    layout->addWidget(label, 1, 1);
+    layout->addWidget(button, 2, 1, Qt::AlignRight);
+    layout->setSizeConstraint(QLayout::SetFixedSize);
+}
+//! [2]
+
+//! [3]
+bool EchoWindow::loadPlugin()
+{
+    QDir pluginsDir(QCoreApplication::applicationDirPath());
+#if defined(Q_OS_WIN)
+    if (pluginsDir.dirName().toLower() == "debug" || pluginsDir.dirName().toLower() == "release")
+        pluginsDir.cdUp();
+#elif defined(Q_OS_MAC)
+    if (pluginsDir.dirName() == "MacOS") {
+        pluginsDir.cdUp();
+        pluginsDir.cdUp();
+        pluginsDir.cdUp();
+    }
+#endif
+    pluginsDir.cd("plugins");
+    const QStringList entries = pluginsDir.entryList(QDir::Files);
+    for (const QString &fileName : entries) {
+        QPluginLoader pluginLoader(pluginsDir.absoluteFilePath(fileName));
+        QObject *plugin = pluginLoader.instance();
+        if (plugin) {
+            echoInterface = qobject_cast<EchoInterface *>(plugin);
+            if (echoInterface)
+                return true;
+            pluginLoader.unload();
+        }
+    }
+
+    return false;
+}
+//! [3]

examples/widgets/tools/echoplugin/echowindow/echowindow.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef ECHODIALOG_H
+#define ECHODIALOG_H
+
+#include <QWidget>
+
+#include "echointerface.h"
+
+QT_BEGIN_NAMESPACE
+class QString;
+class QLineEdit;
+class QLabel;
+class QPushButton;
+class QGridLayout;
+QT_END_NAMESPACE
+
+//! [0]
+class EchoWindow : public QWidget
+{
+    Q_OBJECT
+
+public:
+    EchoWindow();
+
+private slots:
+    void sendEcho();
+
+private:
+    void createGUI();
+    bool loadPlugin();
+
+    EchoInterface *echoInterface;
+    QLineEdit *lineEdit;
+    QLabel *label;
+    QPushButton *button;
+    QGridLayout *layout;
+};
+//! [0]
+
+#endif

examples/widgets/tools/echoplugin/echowindow/echowindow.pro

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+QT += widgets
+
+HEADERS    = echowindow.h \
+             echointerface.h
+SOURCES    = echowindow.cpp \
+             main.cpp
+
+TARGET     = echoplugin
+QMAKE_PROJECT_NAME = echopluginwindow
+win32 {
+    CONFIG(debug, release|debug):DESTDIR = ../debug/
+    CONFIG(release, release|debug):DESTDIR = ../release/
+} else {
+    DESTDIR    = ../
+}
+
+# install
+target.path = $$[QT_INSTALL_EXAMPLES]/widgets/tools/echoplugin
+INSTALLS += target
+
+CONFIG += install_ok  # Do not cargo-cult this!

examples/widgets/tools/echoplugin/echowindow/main.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include <QApplication>
+
+#include "echowindow.h"
+#include "echointerface.h"
+
+//! [0]
+int main(int argv, char *args[])
+{
+    QApplication app(argv, args);
+
+    EchoWindow window;
+    window.show();
+
+    return app.exec();
+}
+//! [0]