Fixed samples:

* use QGuiApplication in main so GUI metadata are available
* parent for thread sample, otherwise ASSERT
Remark: some issue are Qt 5.4 update related

samples/blackmisc/main.cpp

@@ -7,7 +7,7 @@
  * contained in the LICENSE file.
  */
 
-#include <QCoreApplication>
+#include <QGuiApplication>
 #include "sampleschangeobject.h"
 #include "samplesmetadata.h"
 #include "samplescontainer.h"
@@ -21,12 +21,12 @@
 using namespace BlackMisc;
 using namespace BlackMiscTest;
 
-/*!
- * Sample tests
- */
+//! Sample tests
 int main(int argc, char *argv[])
 {
-    QCoreApplication a(argc, argv);;
+    // I use QGuiApplication and not core application
+    // otherwise no QPixmap metadata (metadata sample)
+    QGuiApplication a(argc, argv);
     Q_UNUSED(a);
 
     QTextStream qtout(stdout);

samples/blackmisc/samplesconcurrent.cpp

@@ -10,7 +10,7 @@
 #include "samplesconcurrent.h"
 #include "blackmisc/algorithm.h"
 #include <QDebug>
-#include <QCoreApplication>
+#include <QGuiApplication>
 #include <QtConcurrent/QtConcurrent>
 #include <QString>
 
@@ -25,11 +25,11 @@ namespace BlackMiscTest
         Q_UNUSED(type);
 
         out << "Main thread id: " << QThread::currentThreadId() << endl;
-        CThreadOutput b1("b1");
+        CThreadOutput b1("b1", QGuiApplication::instance());
         b1.start();
-        CThreadOutput b2("b2");
+        CThreadOutput b2("b2", QGuiApplication::instance());
         b2.start();
-        CThreadOutput b3("b3");
+        CThreadOutput b3("b3", QGuiApplication::instance());
         b3.start();
         QThread::msleep(10 * 1000);
         b1.stop();

samples/blackmisc/samplesmetadata.cpp

@@ -11,7 +11,6 @@
 #include "blackmisc/blackmiscfreefunctions.h"
 #include "blackmisc/aviation/atcstationlist.h"
 #include <QDebug>
-#include <QGuiApplication>
 #include <QMetaType>
 
 using namespace BlackMisc::Aviation;
@@ -21,17 +20,10 @@ using namespace BlackMisc::Network;
 
 namespace BlackMiscTest
 {
-
-    /*
-     * Samples
-     */
     int CSamplesMetadata::samples()
     {
-        int argv = 0;
         QTextStream cin(stdin);
         QTextStream cout(stdout);
-        QGuiApplication dummy(argv, nullptr); // otherwise no QPixmap metadata
-        Q_UNUSED(dummy);
         BlackMisc::registerMetadata();
         BlackMisc::displayAllUserMetatypesTypes(cout);