I had built VTK-8.1.1 and Qt5.12.1. After installing pyqt, I wrote a simple project and run it, the error message showed that it needs the newer version of Qt 5.15. So I download Qt-5.15.1 from https://download.qt.io/archive/qt , build it, and install all libraries. I didn’t find QtCreator app, therefore I Read more…
The Extensible Markup Language(XML) can be read by humans and machines, it requires all markups must be paired and case sensitive. The article shows how to write and read the XML file in the Qt environment. Write Data To The Local XML File Create a DOM element by QDomDocument object Read more…
A JSON file stores data objects in JavaScript Object Notation(JSON) format. It’s lightweight and readable, the developer uses it to transmit simple data. The article shows how to create and read the JSON file in the Qt environment. I planed to save two books’ information to a simple JSON file Read more…
sort The QMap object sorts the elements in it by key rather than the order of insert operation. Let’s see the following example. #include <iostream> #include <QMap> #include <QString> using namespace std; int main() { QMap<QString, int> vars; vars.insert( “ABD”, 1 ); vars.insert( “ABE”, 2 ); QMapIterator<QString, int> it( vars Read more…
Independent Thread We want to run a single task in an independent thread in a convenient way in some scenarios. It is common in data process and UI interaction event, for example, we want to use QMovie object to play a gif to indicate our software is analyzing test data, Read more…
Borderless window: setWindowFlags( Qt::FramelessWindowHint ); Set background color: QPalette pal = mainWin->Getui().qvtkWidget->palette(); pal.setColor( QPalette::Background, Qt::black ); setAutoFillBackground( true ); this->setPalette( pal ); Make window stay on the top level: setWindowFlags(Qt::WindowStaysOnTopHint) Remove maximize button in widget： setWindowFlags( this->windowFlags() & ~Qt::WindowMaximizeButtonHint ); Definite buttons on title bar: setWindowFlags( Qt::CustomizeWindowHint | Qt::WindowMaximizeButtonHint); //Only Read more…
The interfaces can imitate users’ operations. QTest::keyClick QTest::keyPress QTest::mouseClick QSignalSpy listens for signal emission, it is a list of QVariant lists. It will not shield off signal to make slot invalid. QCheckBox *box = …; QSignalSpy spy(box, SIGNAL(clicked(bool))); //… QList arguments = spy.takeFirst(); // take the first signal QVERIFY(arguments.at(0).toBool() == Read more…
Simple Unit Test Project Let’s create a new unit test project firstly. Write our test functions in feild private Q_SLOTS for the class. tst_string.cpp: #include <QString> #include <QtTest> class String : public QObject { Q_OBJECT public: String(); private Q_SLOTS: void toUpper(); }; String::String() { } void String::toUpper() { QVERIFY2(true, “Failure”); Read more…
ImagesViwer is a multiple pictures viewer which can show at most 12 images at the same time. Its supported image formats are png, jpg, bmp, and jpeg. We can drag some images into the center showing area, then the software will show them in one layout. It may look fuzzy Read more…