It’s an incompatibility between the versions of Qt5 and libGStreamer0.10. You need libgstreamer1.0-0 (1.22.0-2), and gstreamer1.0-qt5 (1.22.0-5) plugin, and also you may need gtk+3. gst-plugins built from gst-plugins-good1.0 (1.22.0-5). See: https://packages.debian.org/sid/gstreamer1.0-qt5
If you capture conn directly, you’re capturing an uninitialised object by copy, which results in undefined behaviour. You need to capture a smart pointer: std::unique_ptr<QMetaObject::Connection> pconn{new QMetaObject::Connection}; QMetaObject::Connection &conn = *pconn; conn = QObject::connect(m_sock, &QLocalSocket::readyRead, [this, pconn, &conn](){ QObject::disconnect(conn); // … } Or using a shared pointer, with slightly greater overhead: auto conn = std::make_shared<QMetaObject::Connection>(); … Read more
A built-in official solution exists as of Qt 5 thanks to the QtGraphicalEffects module and I’m quite surprised to find out that no one provided such a simple solution. If you are targeting Qt 6.x QtGraphicalEffects is unfortunately deprecated so jump to the second part of the answer which proposes a solution independent of QtGraphicalEffects. … Read more
No, but you may use my fairly comprehensive stylesheets that should look excellent on most platforms (it’s inspired by KDE’s Breeze Theme, which is a dark theme that is quite elegant). This was (hard) forked from the excellent QDarkStylesheet, which I felt had theme issues in numerous areas, so I modified it extensively for my … Read more
After the lines cmake_minimum_required(VERSION 2.8.9) project(testproject) add set (CMAKE_PREFIX_PATH “C:\\Qt\\Qt5.0.1\\5.0.1\\msvc2010\\”) This solves the problem.
This method is tested to work on Visual Studio 2013. Pre-built binaries using Visual Studio 2012 and 2013 are available here, including OpenGL versions. Step 1: The Setup Download and install RapidEE here. RapidEE is a windows environment variables editor. It is extremely useful for the rest of this process (and just in general). Install … Read more
From Qt’s documentation: QPlainTextEdit is an advanced viewer/editor supporting plain text. It is optimized to handle large documents and to respond quickly to user input. QPlainText uses very much the same technology and concepts as QTextEdit, but is optimized for plain text handling. QPlainTextEdit works on paragraphs and characters. A paragraph is a formatted string … Read more
If running Ubuntu, The recommended way to enable the needed ptrace kernel setting (hinted by qtcreator) is to edit /etc/sysctl.d/10-ptrace.conf sudo vim /etc/sysctl.d/10-ptrace.conf Then change kernel.yama.ptrace_scope = 1 to kernel.yama.ptrace_scope = 0 Save, then apply: $ sudo sysctl –system -a -p|grep yama kernel.yama.ptrace_scope = 0 run man sysctl for more info.
Ok, after some more digging into the docs, I found it really is a new class, it has improvements, but it is only available in Qt5, so you can’t use it if you want to compile on both Qt4 and Qt5: Notes for QRegExp Users The QRegularExpression class introduced in Qt 5 is a big … Read more
Here are the full instructions: Get it: git clone https://github.com/mxe/mxe.git Install build dependencies Build Qt 5 for Windows: cd mxe && make qtbase This will first build its dependencies and the cross-build tools; It should take less than an hour on a fast machine with decent internet access. Due to the new modular nature of … Read more