add example

example/plugin_loader.cpp

@@ -0,0 +1,70 @@
+#include <QCoreApplication>
+#include <QCommandLineParser>
+#include <QPluginLoader>
+#include <QDebug>
+#include <QObject>
+#include <QtPlugin>
+#include <QString>
+
+// Minimal local declaration of the PluginInterface with the same IID
+class PluginInterface
+{
+public:
+    virtual ~PluginInterface() {}
+    virtual QString name() const = 0;
+    virtual QString version() const = 0;
+};
+
+#define PluginInterface_iid "com.example.PluginInterface"
+Q_DECLARE_INTERFACE(PluginInterface, PluginInterface_iid)
+
+int main(int argc, char *argv[])
+{
+    QCoreApplication app(argc, argv);
+    app.setApplicationName("plugin_loader");
+    app.setApplicationVersion("1.0");
+
+    QCommandLineParser parser;
+    parser.setApplicationDescription("Minimal Qt plugin loader example (Package Manager)");
+    parser.addHelpOption();
+    parser.addVersionOption();
+
+    QCommandLineOption pluginPathOption(QStringList() << "p" << "path",
+                                       "Path to the plugin file (.so/.dylib)",
+                                       "plugin_path");
+    parser.addOption(pluginPathOption);
+
+    parser.process(app);
+
+    QString pluginPath = parser.value(pluginPathOption);
+    if (pluginPath.isEmpty()) {
+        qCritical() << "Plugin path must be specified with --path";
+        return 1;
+    }
+
+    qInfo() << "Loading plugin from" << pluginPath;
+
+    QPluginLoader loader(pluginPath);
+    QObject *plugin = loader.instance();
+
+    if (!plugin) {
+        qCritical() << "Failed to load plugin:" << loader.errorString();
+        return 1;
+    }
+
+    qInfo() << "Plugin loaded successfully.";
+
+    if (PluginInterface *iface = qobject_cast<PluginInterface *>(plugin)) {
+        qInfo() << "Plugin name:" << iface->name();
+        qInfo() << "Plugin version:" << iface->version();
+    } else {
+        const QMetaObject *meta = plugin->metaObject();
+        if (meta) {
+            qInfo() << "Qt class name:" << meta->className();
+        }
+    }
+
+    return 0;
+}
+
+