Fix some compiler warnings in the MQTT WebsocketSubscription Example

Fix some warnings that were reported by the MSVC compiler with the Wall
setting:
- use static_cast for signed/unsigned conversion
- use QString::fromUtf8 instead of the QByteArray constructor

Pick-to: 6.5
Task-number: QTBUG-110893
Change-Id: Ic982d3c16feb1ebcef729b4dfd023cc3b5017fec
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

1 files changed, 2 insertions, 2 deletions

diff --git a/examples/mqtt/websocketsubscription/websocketiodevice.cpp b/examples/mqtt/websocketsubscription/websocketiodevice.cpp
index 74ac77e..479688a 100644
--- a/examples/mqtt/websocketsubscription/websocketiodevice.cpp
+++ b/examples/mqtt/websocketsubscription/websocketiodevice.cpp
@@ -17,7 +17,7 @@ WebSocketIODevice::WebSocketIODevice(QObject *parent)
 bool WebSocketIODevice::open(QIODevice::OpenMode mode)
 {
     QWebSocketHandshakeOptions options;
-    options.setSubprotocols({m_protocol});
+    options.setSubprotocols(QStringList{ QString::fromUtf8(m_protocol) });
 
     m_socket.open(m_url, options);
 
@@ -33,7 +33,7 @@ void WebSocketIODevice::close()
 qint64 WebSocketIODevice::readData(char *data, qint64 maxlen)
 {
     qint64 bytesToRead = qMin(maxlen, (qint64)m_buffer.size());
-    memcpy(data, m_buffer.constData(), bytesToRead);
+    memcpy(data, m_buffer.constData(), static_cast<size_t>(bytesToRead));
     m_buffer = m_buffer.right(m_buffer.size() - bytesToRead);
     return bytesToRead;
 }