First off it’s a bad idea to create MainGame before you create your QApplication object. If you want to have your MainGame object globally available like this it should be a pointer: MainWindow *Game; int main (int argc, char **argv) { QApplication a (argc, argv); Game = new MainWindow(); Game->show(); int result = a.exec(); delete … Read more
I will just put this code here. It is not panacea, as it doesn’t deal with FreeBSD, but it is helpful in most cases when all you need is to support Windows and and say Debian. Of course, the clean solution assumes usage of CRYPTO_THREADID_* family introduced recently. (to give an idea, it has a … Read more
You could simply: import QtQuick 2.0 Rectangle { id: root height: 500 width: 500 property string sc: ‘import QtQuick 2.0; Rectangle {width: 20; height: 20; color: “red”; Component.onCompleted: {x = Math.random() * parent.width; y = Math.random() * parent.height;}}’ Component.onCompleted: { for (var i = 0; i < 10; ++i) Qt.createQmlObject(sc, root, ‘obj’ + i); } … Read more
No you can’t get a signal when you use startDetached because you have no object. startDetached is a static function and when you call it the process is started directly without creating a QProcess object. Therefore, even if there was a signal you would not be able to connect it to anything since you have … Read more
As s workaround you can use a label or text document to print the text you want. You should paint it to a pixmap and use the pixmap on your button : QPushButton *button = new QPushButton(this); QTextDocument Text; Text.setHtml(“<h2><i>Hello</i> “”<font color=red>Qt!</font></h2>”); QPixmap pixmap(Text.size().width(), Text.size().height()); pixmap.fill( Qt::transparent ); QPainter painter( &pixmap ); Text.drawContents(&painter, pixmap.rect()); QIcon … Read more
Below is a self contained sketch. The mosaicing algorithm is mid-way through the algorithms implemented in an excellent reference. It works well enough for two hours of work, I think. I tried for the code to be reasonably correct, with two caveats, left, as they say, as an exercise to the reader. I’m not tracking … Read more
We should check our driver first $ cd /opt/Qt5.2.1/5.2.1/gcc_64/plugins/sqldrivers then we can find some files Use the command below to check library $ ldd libqsqlmysql.so if you find the problem libmysqlclient_r.so.16 => not found it may be the library-dependency problem. After I did a little research on the Internet, there is a way would be … Read more
To detect a hung event loop, you need to wrap the operation that can hang the event loop, to detect when it takes too long. The “operation” is the QCoreApplication::notify member. It is called to deliver events to all event loops, in all threads. An event loop hang occurs when the code that processes an … Read more
How to build the Qt-SQL-driver-plugin ‘QSQLCIPHER’ for SQLite-DB with SQLCipher-extension using the Windows/MinGW-platform: Qt 5.4.0 for Windows/MinGW Download Qt Install including the sources e.g to C:\Qt\Qt5.4.0 OpenSSL for Windows Download Win32 OpenSSL v1.0.2a Download Visual C++ 2008 Redistributable Install Visual C++ 2008 Redistributable by executing ‘vcredist_x86.exe’ Install OpenSSL v1.0.2a by executing ‘Win32OpenSSL-1_0_2.exe’ Target directory e.g. … Read more
When first trying pyqt4 and pyqt5 and the pycharm IDE I had many problems with imports. (although the imports had no prob running from IDLE) Eventually after much stuffing around, uninstalling and reinstalling, (including dependencies) the imports sorted themselves out. Did you install pyqt5 using an installer from the pyqt website? You must. Qt designer … Read more