script: 1.add xp build bat. 2.fix Qt6 compile.

ClientCore/ClientCore.cpp

@@ -36,6 +36,10 @@ void ClientCore::DoConnect(const QString& ip, quint16 port)
 
 bool ClientCore::Connect(const QString& ip, quint16 port)
 {
+    if (connected_) {
+        qInfo() << QString(tr("already connected."));
+        return true;
+    }
     socket_->connectToHost(ip, port);
     if (!socket_->waitForConnected(3000)) {
         qCritical() << QString(tr("%1:%2 connect failed...")).arg(ip).arg(port);

ClientCore/ClientCore.h

@@ -26,12 +26,14 @@ public:
 
 public slots:
     bool SendFrame(QSharedPointer<FrameBuffer> frame);
+    void Disconnect();
+
+public slots:
+    void DoConnect(const QString& ip, quint16 port);
 
 public:
     void Instance();
     bool Connect(const QString& ip, quint16 port);
-    void DoConnect(const QString& ip, quint16 port);
-    void Disconnect();
     bool Send(QSharedPointer<FrameBuffer> frame);
     bool Send(const char* data, qint64 len);
     bool IsConnect();