Make examples return -1 on load failures.

Avoid hanging processes and empty windows in case some module is not
installed.

Change-Id: I26c0b0fafc87ae17719850ad06f13c946f099dd9
Reviewed-by: Mitch Curtis <mitch.curtis@theqtcompany.com>

5 files changed, 10 insertions, 0 deletions

diff --git a/examples/quick/calendar/main.cpp b/examples/quick/calendar/main.cpp
index 1d739add..651a51ec 100644
--- a/examples/quick/calendar/main.cpp
+++ b/examples/quick/calendar/main.cpp
@@ -225,6 +225,8 @@ int main(int argc, char *argv[])
     qmlRegisterType<SqlEventModel>("io.qt.examples.calendar", 1, 0, "SqlEventModel");
     QQmlApplicationEngine engine;
     engine.load(QUrl("qrc:/main.qml"));
+    if (engine.rootObjects().isEmpty())
+        return -1;
     return app.exec();
 }
 
diff --git a/examples/quick/controls/mirroring/main.cpp b/examples/quick/controls/mirroring/main.cpp
index 92844360..2abdc16d 100644
--- a/examples/quick/controls/mirroring/main.cpp
+++ b/examples/quick/controls/mirroring/main.cpp
@@ -46,5 +46,7 @@ int main(int argc, char *argv[])
     QGuiApplication app(argc, argv);
     QQmlApplicationEngine engine;
     engine.load(QUrl("qrc:/main.qml"));
+    if (engine.rootObjects().isEmpty())
+        return -1;
     return app.exec();
 }
diff --git a/examples/quick/controls/tabs/main.cpp b/examples/quick/controls/tabs/main.cpp
index 92844360..2abdc16d 100644
--- a/examples/quick/controls/tabs/main.cpp
+++ b/examples/quick/controls/tabs/main.cpp
@@ -46,5 +46,7 @@ int main(int argc, char *argv[])
     QGuiApplication app(argc, argv);
     QQmlApplicationEngine engine;
     engine.load(QUrl("qrc:/main.qml"));
+    if (engine.rootObjects().isEmpty())
+        return -1;
     return app.exec();
 }
diff --git a/examples/quick/controls/theme/main.cpp b/examples/quick/controls/theme/main.cpp
index 92844360..2abdc16d 100644
--- a/examples/quick/controls/theme/main.cpp
+++ b/examples/quick/controls/theme/main.cpp
@@ -46,5 +46,7 @@ int main(int argc, char *argv[])
     QGuiApplication app(argc, argv);
     QQmlApplicationEngine engine;
     engine.load(QUrl("qrc:/main.qml"));
+    if (engine.rootObjects().isEmpty())
+        return -1;
     return app.exec();
 }
diff --git a/examples/quick/extras/drawer/main.cpp b/examples/quick/extras/drawer/main.cpp
index 92844360..2abdc16d 100644
--- a/examples/quick/extras/drawer/main.cpp
+++ b/examples/quick/extras/drawer/main.cpp
@@ -46,5 +46,7 @@ int main(int argc, char *argv[])
     QGuiApplication app(argc, argv);
     QQmlApplicationEngine engine;
     engine.load(QUrl("qrc:/main.qml"));
+    if (engine.rootObjects().isEmpty())
+        return -1;
     return app.exec();
 }