Added QMessageBox notifications for device connection errors and channel control errors

channelwidget.cpp

@@ -3,6 +3,7 @@
 
 #include "channelwidget.h"
 #include <QDebug>
+#include <QMessageBox>
 
 ChannelWidget::ChannelWidget(uint16_t deviceSerial, uint16_t channelNumber, struct eismultiplexer* multiplexer,
                              QWidget *parent)
@@ -36,13 +37,19 @@ void ChannelWidget::onChannelToggled(bool checked)
     channel_t channelFlag = static_cast<channel_t>(1 << channelNumber);
     if (checked) {
         if (eismultiplexer_connect_channel(multiplexer, channelFlag) < 0) {
+            QMessageBox::warning(this, tr("Connection Failed"),
+                                 tr("Failed to connect channel %1 on device %2").arg(channelNumber).arg(deviceSerial));
             qWarning() << "Failed to connect channel" << channelNumber << "on device" << deviceSerial;
             checkbox->setChecked(false);
+            setEnabled(false); // Gray out the widget
         }
     } else {
         if (eismultiplexer_disconnect_channel(multiplexer, channelFlag) < 0) {
+            QMessageBox::warning(this, tr("Disconnection Failed"),
+                                 tr("Failed to disconnect channel %1 on device %2").arg(channelNumber).arg(deviceSerial));
             qWarning() << "Failed to disconnect channel" << channelNumber << "on device" << deviceSerial;
             checkbox->setChecked(true);
+            setEnabled(false); // Gray out the widget
         }
     }
 }

channelwidget.h

@@ -27,7 +27,7 @@ private:
     uint16_t channelNumber;
     struct eismultiplexer* multiplexer;
     QCheckBox* checkbox;
-    QLabel* label;
+    QLabel* label;    // No need for tr() function, QObject already provides it
 };
 
 #endif // CHANNELWIDGET_H

mainwindow.cpp

@@ -2,6 +2,7 @@
 
 #include "mainwindow.h"
 #include <QDebug>
+#include <QMessageBox>
 #include <eismultiplexer.h>
 
 MainWindow::MainWindow(QWidget *parent)
@@ -48,7 +49,9 @@ void MainWindow::enumerateDevices()
     size_t count = 0;
     uint16_t* serials = eismultiplexer_list_available_devices(&count);
 
-    if (!serials) {
+    if (!serials || count == 0) {
+        QMessageBox::warning(this, tr("No Devices Found"),
+                             tr("No EIS multiplexer devices were found. Please connect a device and try again."));
         qWarning() << "No EIS multiplexer devices found";
         return;
     }
@@ -67,6 +70,8 @@ void MainWindow::enumerateDevices()
             }
             eismultiplexer_disconnect(&multiplexer);
         } else {
+            QMessageBox::warning(this, tr("Connection Failed"),
+                                 tr("Failed to connect to device with serial %1").arg(serial));
             qWarning() << "Failed to connect to device with serial" << serial;
         }
     }

mainwindow.h

@@ -22,6 +22,8 @@ public:
     explicit MainWindow(QWidget *parent = nullptr);
     ~MainWindow() override;
 
+    // No need for tr() function, QObject already provides it
+
 private:
     void enumerateDevices();
     void setupUi();