gui: improved error message when project import fails

Author: danmar

gui/mainwindow.cpp

@@ -1687,7 +1687,38 @@ void MainWindow::analyzeProject(const ProjectFile *projectFile, const bool check
             prjfile = inf.canonicalPath() + '/' + projectFile->getImportProject();
         }
         try {
-            p.import(prjfile.toStdString());
+
+            const ImportProject::Type result = p.import(prjfile.toStdString());
+
+            QString errorMessage;
+            switch (result) {
+            case ImportProject::Type::COMPILE_DB:
+            case ImportProject::Type::VS_SLN:
+            case ImportProject::Type::VS_VCXPROJ:
+            case ImportProject::Type::BORLAND:
+            case ImportProject::Type::CPPCHECK_GUI:
+                // Loading was successful
+                break;
+            case ImportProject::Type::MISSING:
+                errorMessage = tr("Failed to open file");
+                break;
+            case ImportProject::Type::UNKNOWN:
+                errorMessage = tr("Unknown project file format");
+                break;
+            case ImportProject::Type::FAILURE:
+                errorMessage = tr("Failed to import project file");
+                break;
+            }
+
+            if (!errorMessage.isEmpty()) {
+                QMessageBox msg(QMessageBox::Critical,
+                                tr("Cppcheck"),
+                                tr("Failed to import '%1': %2\n\nAnalysis is stopped.").arg(prjfile).arg(errorMessage),
+                                QMessageBox::Ok,
+                                this);
+                msg.exec();
+                return;
+            }
         } catch (InternalError &e) {
             QMessageBox msg(QMessageBox::Critical,
                             tr("Cppcheck"),