qmlprofiler: Improve options for trace output

* Remove the auto-generation of file names.
* Accept file names as parameters or from interactive commands
* Output to stdout by default for better scripting and quick preview
* Decouple output from clearing of data so that you can write the same
  data multiple times.

Task-number: QTBUG-43066
Change-Id: Ia4cc3701cbac7c6f8948b11307130a5d6a2ff44c
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

1 files changed, 12 insertions, 4 deletions

diff --git a/tools/qmlprofiler/qmlprofilerdata.cpp b/tools/qmlprofiler/qmlprofilerdata.cpp
index eaa7cc0e7e..72aeafcb0f 100644
--- a/tools/qmlprofiler/qmlprofilerdata.cpp
+++ b/tools/qmlprofiler/qmlprofilerdata.cpp
@@ -553,10 +553,18 @@ bool QmlProfilerData::save(const QString &filename)
         return false;
     }
 
-    QFile file(filename);
-    if (!file.open(QIODevice::WriteOnly)) {
-        emit error(tr("Could not open %1 for writing").arg(filename));
-        return false;
+    QFile file;
+    if (!filename.isEmpty()) {
+        file.setFileName(filename);
+        if (!file.open(QIODevice::WriteOnly)) {
+            emit error(tr("Could not open %1 for writing").arg(filename));
+            return false;
+        }
+    } else {
+        if (!file.open(stdout, QIODevice::WriteOnly)) {
+            emit error(tr("Could not open stdout for writing"));
+            return false;
+        }
     }
 
     QXmlStreamWriter stream(&file);