Fix compiler warnings in MQTT Subscription Example

Fix some signed/unsigned conversion warnings.

Add explicit QMqttSubscription::Unsubscription case.

These warnings were reported by Visual Studio with the Wall compiler
setting.

Task-number: QTBUG-110893
Change-Id: Ief64c4a04ba679f52c3e256aa96bb8f239ae68e9
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@qt.io>
(cherry picked from commit 9e8dbb150938e82ec770d15f0daea5cb553a7bba)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

2 files changed, 11 insertions, 7 deletions

diff --git a/examples/mqtt/subscriptions/mainwindow.cpp b/examples/mqtt/subscriptions/mainwindow.cpp
index 67b60c0..dd0c03e 100644
--- a/examples/mqtt/subscriptions/mainwindow.cpp
+++ b/examples/mqtt/subscriptions/mainwindow.cpp
@@ -17,7 +17,7 @@ MainWindow::MainWindow(QWidget *parent) :
 
     m_client = new QMqttClient(this);
     m_client->setHostname(ui->lineEditHost->text());
-    m_client->setPort(ui->spinBoxPort->value());
+    m_client->setPort(static_cast<quint16>(ui->spinBoxPort->value()));
 
     connect(m_client, &QMqttClient::stateChanged, this, &MainWindow::updateLogStateChange);
     connect(m_client, &QMqttClient::disconnected, this, &MainWindow::brokerDisconnected);
@@ -96,21 +96,22 @@ void MainWindow::brokerDisconnected()
 
 void MainWindow::setClientPort(int p)
 {
-    m_client->setPort(p);
+    m_client->setPort(static_cast<quint16>(p));
 }
 
 void MainWindow::on_buttonPublish_clicked()
 {
-    if (m_client->publish(ui->lineEditTopic->text(),
-                          ui->lineEditMessage->text().toUtf8(),
-                          ui->spinQoS_2->text().toUInt(),
-                          ui->checkBoxRetain->isChecked()) == -1)
+    if (m_client->publish(ui->lineEditTopic->text(), ui->lineEditMessage->text().toUtf8(),
+                          static_cast<quint8>(ui->spinQoS_2->text().toUInt()),
+                          ui->checkBoxRetain->isChecked())
+        == -1)
         QMessageBox::critical(this, QLatin1String("Error"), QLatin1String("Could not publish message"));
 }
 
 void MainWindow::on_buttonSubscribe_clicked()
 {
-    auto subscription = m_client->subscribe(ui->lineEditTopic->text(), ui->spinQoS->text().toUInt());
+    auto subscription = m_client->subscribe(ui->lineEditTopic->text(),
+                                            static_cast<quint8>(ui->spinQoS->text().toUInt()));
     if (!subscription) {
         QMessageBox::critical(this, QLatin1String("Error"), QLatin1String("Could not subscribe. Is there a valid connection?"));
         return;
diff --git a/examples/mqtt/subscriptions/subscriptionwindow.cpp b/examples/mqtt/subscriptions/subscriptionwindow.cpp
index e964a07..a387c62 100644
--- a/examples/mqtt/subscriptions/subscriptionwindow.cpp
+++ b/examples/mqtt/subscriptions/subscriptionwindow.cpp
@@ -48,6 +48,9 @@ void SubscriptionWindow::updateStatus(QMqttSubscription::SubscriptionState state
     case QMqttSubscription::Error:
         ui->labelStatus->setText(QLatin1String("Error"));
         break;
+    case QMqttSubscription::UnsubscriptionPending:
+        ui->labelStatus->setText(QLatin1String("Pending Unsubscription"));
+        break;
     default:
         ui->labelStatus->setText(QLatin1String("--Unknown--"));
         break;