Added version check for settings to prevent application crashes because of old, incompatible settings

src/Core.cc

@@ -40,6 +40,7 @@ This file is part of the QGROUNDCONTROL project
 #include <QAction>
 
 #include "configuration.h"
+#include "QGC.h"
 #include "Core.h"
 #include "MG.h"
 #include "MainWindow.h"
@@ -69,6 +70,25 @@ Core::Core(int &argc, char* argv[]) : QApplication(argc, argv)
     this->setOrganizationName(QLatin1String("OPENMAV"));
     this->setOrganizationDomain("http://qgroundcontrol.org");
 
+    // Check application settings
+    // clear them if they mismatch
+    // QGC then falls back to default
+    QSettings settings;
+    if (settings.contains("QGC_APPLICATION_VERSION_INT"))
+    {
+        QString qgcVersion = settings.value("QGC_APPLICATION_VERSION").toString();
+        if (qgcVersion != QGC_APPLICATION_VERSION)
+        {
+            settings.clear();
+        }
+    }
+    else
+    {
+        // If application version is not set, clear settings anyway
+        settings.clear();
+    }
+    settings.sync();
+
     // Show splash screen
     QPixmap splashImage(":images/splash.png");
     QSplashScreen* splashScreen = new QSplashScreen(splashImage, Qt::WindowStaysOnTopHint);

src/QGC.h

@@ -5,6 +5,8 @@
 #include <QColor>
 #include <QThread>
 
+#include "configuration.h"
+
 namespace QGC
 {
     const QColor colorCyan(55, 154, 195);
@@ -18,9 +20,7 @@ namespace QGC
     quint64 groundTimeUsecs();
     int applicationVersion();
 
-    const QString APPNAME = "QGROUNDCONTROL";
-    const QString COMPANYNAME = "OPENMAV";
-    const int APPLICATIONVERSION = 80; // 0.8.0
+
 
     class SLEEP : public QThread
     {

src/configuration.h

@@ -2,6 +2,7 @@
 #define CONFIGURATION_H
 
 #include "mavlink.h"
+#include <QString>
 
 /** @brief Polling interval in ms */
 #ifdef MAVLINK_ENABLED_SLUGS
@@ -16,6 +17,14 @@
 #define WITH_TEXT_TO_SPEECH 1
 
 #define QGC_APPLICATION_NAME "QGroundControl"
-#define QGC_APPLICATION_VERSION "v. 0.8.0 (Beta)"
+#define QGC_APPLICATION_VERSION "v. 0.8.1 (Alpha)"
+
+namespace QGC
+
+{
+    const QString APPNAME = "QGROUNDCONTROL";
+    const QString COMPANYNAME = "OPENMAV";
+    const int APPLICATIONVERSION = 80; // 0.8.0
+}
 
 #endif // CONFIGURATION_H