Adapt UI files tutorial to newly added UiLoader example

Amends cf8e0d98821cc7e6f0fc48b56a0a16ad88cd881b.

Task-number: PYSIDE-841
Change-Id: Iea6ab04e2ce8c4fb77d7d5c770dc45005f2635dc
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>

1 files changed, 8 insertions, 3 deletions

diff --git a/sources/pyside2/doc/tutorials/basictutorial/uifiles.rst b/sources/pyside2/doc/tutorials/basictutorial/uifiles.rst
index a45bfc18c..2c0178e2e 100644
--- a/sources/pyside2/doc/tutorials/basictutorial/uifiles.rst
+++ b/sources/pyside2/doc/tutorials/basictutorial/uifiles.rst
@@ -163,12 +163,17 @@ The complete code of this example looks like this:
     if __name__ == "__main__":
         app = QApplication(sys.argv)
 
-        ui_file = QFile("mainwindow.ui")
-        ui_file.open(QFile.ReadOnly)
-
+        ui_file_name = "mainwindow.ui"
+        ui_file = QFile(ui_file_name)
+        if not ui_file.open(QIODevice.ReadOnly):
+            print("Cannot open {}: {}".format(ui_file_name, ui_file.errorString()))
+            sys.exit(-1)
         loader = QUiLoader()
         window = loader.load(ui_file)
         ui_file.close()
+        if not window:
+            print(loader.errorString())
+            sys.exit(-1)
         window.show()
 
         sys.exit(app.exec_())