Merge branch 'feature-fix-nomainwindow-app-crash' into develop

sdk/libraries/core/application/Application.cpp

@@ -266,42 +266,57 @@ void Application::refresh() {
 
 // ----------------- showStatusBarMessage --------------------
 void Application::showStatusBarMessage(QString msg, int timeout) {
-    QStatusBar * statusBar = mainWindow->statusBar();
+    // if this application has no main window (no GUI)
+    // there is no status bar, therefore nothing to do
+    if (mainWindow) {
+        QStatusBar * statusBar = mainWindow->statusBar();
 
-    if (statusBar) {
-        statusBar->showMessage(msg, timeout);
-    } else {
-        CAMITK_INFO("Application", "showStatusBarMessage", msg.toStdString() << std::endl);
+        if (statusBar) {
+            statusBar->showMessage(msg, timeout);
+        } else {
+            CAMITK_INFO("Application", "showStatusBarMessage", msg.toStdString() << std::endl);
+        }
     }
 }
 
 // ----------------- resetProgressBar --------------------
 void Application::resetProgressBar() {
-    QProgressBar * progress = mainWindow->getProgressBar();
+    // if this application has no main window (no GUI)
+    // there is no status bar, therefore nothing to do
+    if (mainWindow) {
+        QProgressBar * progress = mainWindow->getProgressBar();
 
-    if (progress) {
-        progress->setValue(0);
+        if (progress) {
+            progress->setValue(0);
+        }
     }
 }
 
 // ----------------- setProgressBarValue --------------------
 void Application::setProgressBarValue(int value) {
-    QProgressBar * progress = mainWindow->getProgressBar();
+    // if this application has no main window (no GUI)
+    // there is no status bar, therefore nothing to do
+    if (mainWindow) {
+        QProgressBar * progress = mainWindow->getProgressBar();
 
-    if (progress) {
-        progress->setValue(value);
+        if (progress) {
+            progress->setValue(value);
+        }
     }
-
 }
 
 // ----------------- vtkProgressFunction --------------------
 void Application::vtkProgressFunction(vtkObject * caller, long unsigned int eventId, void * clientData, void * callData) {
-    QProgressBar * progress = mainWindow->getProgressBar();
-    vtkAlgorithm * filter = static_cast<vtkAlgorithm *>(caller);
-    int progressVal = filter->GetProgress() * 100;
-
-    if (progress) {
-        progress->setValue(progressVal);
+    // if this application has no main window (no GUI)
+    // there is no status bar, therefore nothing to do
+    if (mainWindow) {
+        QProgressBar * progress = mainWindow->getProgressBar();
+        vtkAlgorithm * filter = static_cast<vtkAlgorithm *>(caller);
+        int progressVal = filter->GetProgress() * 100;
+
+        if (progress) {
+            progress->setValue(progressVal);
+        }
     }
 }