QNetworkDiskCache: Update doc snippets

We should encourage users to use the system cache directory.
We should also encourage users to not use the char* QString-ctors.

QStandardPaths::CacheLocation is documented to never be empty, so use it
in this manner.

Pick-to: 6.5
Change-Id: I1f050feda5b0a8e7c23fbed5db904bb0180b45f0
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

1 files changed, 6 insertions, 3 deletions

diff --git a/src/network/doc/snippets/code/src_network_access_qnetworkdiskcache.cpp b/src/network/doc/snippets/code/src_network_access_qnetworkdiskcache.cpp
index f830439124..1087f52035 100644
--- a/src/network/doc/snippets/code/src_network_access_qnetworkdiskcache.cpp
+++ b/src/network/doc/snippets/code/src_network_access_qnetworkdiskcache.cpp
@@ -4,17 +4,20 @@
 //! [0]
 QNetworkAccessManager *manager = new QNetworkAccessManager(this);
 QNetworkDiskCache *diskCache = new QNetworkDiskCache(this);
-diskCache->setCacheDirectory("cacheDir");
+QString directory = QStandardPaths::writableLocation(QStandardPaths::CacheLocation)
+        + QLatin1StringView("/cacheDir/");
+diskCache->setCacheDirectory(directory);
 manager->setCache(diskCache);
 //! [0]
 
 //! [1]
+using namespace Qt::StringLiterals;
 // do a normal request (preferred from network, as this is the default)
-QNetworkRequest request(QUrl(QString("http://qt-project.org")));
+QNetworkRequest request(QUrl(u"http://qt-project.org"_s));
 manager->get(request);
 
 // do a request preferred from cache
-QNetworkRequest request2(QUrl(QString("http://qt-project.org")));
+QNetworkRequest request2(QUrl(u"http://qt-project.org"_s));
 request2.setAttribute(QNetworkRequest::CacheLoadControlAttribute, QNetworkRequest::PreferCache);
 manager->get(request2);
 //! [1]