examples: check return value of QFile::open() calls

QFile::open() is marked [[nodiscard]].

Change-Id: I0fa884b329a47c4ad59f40d66b5fbc38f3a5648e
Reviewed-by: Friedemann Kleint <[email protected]>

2 files changed, 14 insertions, 3 deletions

diff --git a/examples/qtconcurrent/wordcount/main.cpp b/examples/qtconcurrent/wordcount/main.cpp
index b157aabe47c..4369f7995d6 100644
--- a/examples/qtconcurrent/wordcount/main.cpp
+++ b/examples/qtconcurrent/wordcount/main.cpp
@@ -20,7 +20,11 @@ WordCount singleThreadedWordCount(const QStringList &files)
     WordCount wordCount;
     for (const QString &file : files) {
         QFile f(file);
-        f.open(QIODevice::ReadOnly);
+        if (!f.open(QIODevice::ReadOnly)) {
+            qWarning().noquote() << "Failed to open file:" << QDir::toNativeSeparators(file)
+                                 << ":" << f.errorString();
+            return {};
+        }
         QTextStream textStream(&f);
         while (!textStream.atEnd()) {
             const auto words =  textStream.readLine().split(' ', Qt::SkipEmptyParts);
@@ -37,7 +41,11 @@ WordCount singleThreadedWordCount(const QStringList &files)
 WordCount countWords(const QString &file)
 {
     QFile f(file);
-    f.open(QIODevice::ReadOnly);
+    if (!f.open(QIODevice::ReadOnly)) {
+        qWarning().noquote() << "Failed to open file:" << QDir::toNativeSeparators(file)
+                             << ":" << f.errorString();
+        return {};
+    }
     QTextStream textStream(&f);
     WordCount wordCount;
 
diff --git a/examples/widgets/itemviews/editabletreemodel/mainwindow.cpp b/examples/widgets/itemviews/editabletreemodel/mainwindow.cpp
index 75d7eb7e73c..147434b9926 100644
--- a/examples/widgets/itemviews/editabletreemodel/mainwindow.cpp
+++ b/examples/widgets/itemviews/editabletreemodel/mainwindow.cpp
@@ -17,7 +17,10 @@ MainWindow::MainWindow(QWidget *parent)
     const QStringList headers({tr("Title"), tr("Description")});
 
     QFile file(":/default.txt"_L1);
-    file.open(QIODevice::ReadOnly | QIODevice::Text);
+    const bool res = file.open(QIODevice::ReadOnly | QIODevice::Text);
+    Q_ASSERT_X(res, Q_FUNC_INFO, "Failed to open ':/default.txt'");
+    if (!res)
+        return;
     auto *model = new TreeModel(headers, QString::fromUtf8(file.readAll()), this);
     file.close();