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-rw-r--r--examples/datavisualization/bars/main.cpp8
1 files changed, 8 insertions, 0 deletions
diff --git a/examples/datavisualization/bars/main.cpp b/examples/datavisualization/bars/main.cpp
index f6d8752c..9eb7a526 100644
--- a/examples/datavisualization/bars/main.cpp
+++ b/examples/datavisualization/bars/main.cpp
@@ -30,6 +30,7 @@
#include <QtWidgets/QSlider>
#include <QtWidgets/QFontComboBox>
#include <QtWidgets/QLabel>
+#include <QtWidgets/QMessageBox>
#include <QtGui/QScreen>
#include <QtGui/QFontDatabase>
@@ -41,6 +42,13 @@ int main(int argc, char **argv)
QWidget *container = QWidget::createWindowContainer(widgetgraph);
//! [0]
+ if (!widgetgraph->hasContext()) {
+ QMessageBox msgBox;
+ msgBox.setText("Couldn't initialize the OpenGL context.");
+ msgBox.exec();
+ return -1;
+ }
+
QSize screenSize = widgetgraph->screen()->size();
container->setMinimumSize(QSize(screenSize.width() / 2, screenSize.height() / 1.5));
container->setMaximumSize(screenSize);