first commit

main.cpp

@@ -0,0 +1,56 @@
+#include "mainwindow.h"
+
+#include <QApplication>
+#include <QLocalSocket>
+#include <QLocalServer>
+
+bool isAlreadyRunning() {
+    QLocalSocket socket;
+    socket.connectToServer(APPNAME);
+
+    // 已有实例存在
+    if (socket.waitForConnected(100)) {
+        socket.write("raise");
+        socket.flush();
+        socket.waitForBytesWritten(100);
+        socket.disconnectFromServer();
+        return true;
+    }
+
+    // 尝试清除之前未正常退出的 socket 文件
+    QLocalServer::removeServer(APPNAME);
+    return false;
+}
+
+int main(int argc, char *argv[]) {
+    QApplication a(argc, argv);
+
+    if (isAlreadyRunning()) {
+        return 0;
+    }
+
+    MainWindow w;
+    w.show();
+
+    // 建立本地 server
+    QLocalServer server;
+    if (!server.listen(APPNAME)) {
+        return -1;
+    }
+
+    QObject::connect(&server, &QLocalServer::newConnection, [&]() {
+        QLocalSocket *client = server.nextPendingConnection();
+        if (!client) return;
+
+        QObject::connect(client, &QLocalSocket::readyRead, [&]() {
+            QByteArray msg = client->readAll();
+            if (msg == "raise") {
+                w.showFromTray();
+            }
+        });
+
+        QObject::connect(client, &QLocalSocket::disconnected, client, &QLocalSocket::deleteLater);
+    });
+
+    return a.exec();
+}