Convert fprintf(stderr, ...); exit(EXIT_FAILURE); to qFatal(...)

The serialization conversion example used raw C's way to abort on
error; change to using Qt's way of doing the same. Likewise, convert
the various other uses of fprintf(stderr, ...) to qWarning() and of
printf(...) to qInfo().

Pick-to: 6.6 6.5
Task-number: QTBUG-111228
Change-Id: Ia8821d3c20f58f71c106028ec422ad473c11e164
Reviewed-by: Ivan Solovev <ivan.solovev@qt.io>

1 files changed, 6 insertions, 10 deletions

diff --git a/examples/corelib/serialization/convert/jsonconverter.cpp b/examples/corelib/serialization/convert/jsonconverter.cpp
index b6a6a1dd40..6c307cdb8c 100644
--- a/examples/corelib/serialization/convert/jsonconverter.cpp
+++ b/examples/corelib/serialization/convert/jsonconverter.cpp
@@ -18,10 +18,8 @@ static const char jsonOptionHelp[] = "compact=no|yes              Use compact JS
 static QJsonDocument convertFromVariant(const QVariant &v)
 {
     QJsonDocument doc = QJsonDocument::fromVariant(v);
-    if (!doc.isObject() && !doc.isArray()) {
-        fprintf(stderr, "Could not convert contents to JSON.\n");
-        exit(EXIT_FAILURE);
-    }
+    if (!doc.isObject() && !doc.isArray())
+        qFatal("Could not convert contents to JSON.");
     return doc;
 }
 
@@ -75,9 +73,8 @@ QVariant JsonConverter::loadFile(QIODevice *f, const Converter *&outputConverter
     if (doc.isNull())
         doc = QJsonDocument::fromJson(f->readAll(), &error);
     if (error.error) {
-        fprintf(stderr, "Could not parse JSON content: offset %d: %s",
-                error.offset, qPrintable(error.errorString()));
-        exit(EXIT_FAILURE);
+        qFatal("Could not parse JSON content: offset %d: %s",
+               error.offset, qPrintable(error.errorString()));
     }
     if (outputConverter == null)
         return QVariant();
@@ -94,9 +91,8 @@ void JsonConverter::saveFile(QIODevice *f, const QVariant &contents,
         } else if (s == "compact=yes"_L1) {
             format = QJsonDocument::Compact;
         } else {
-            fprintf(stderr, "Unknown option '%s' to JSON output. Valid options are:\n%s",
-                    qPrintable(s), jsonOptionHelp);
-            exit(EXIT_FAILURE);
+            qFatal("Unknown option '%s' to JSON output. Valid options are:\n%s",
+                   qPrintable(s), jsonOptionHelp);
         }
     }