qt5

问题 I'm looking for a simple way to create a rectangle in a QQuickItem . I want to resize, and drag the borders of this rectangle like this (found at resizable QRubberBand) Has someone an idea? 回答1: There are probably several ways to achieve the desired result. Since I've considered the implementation of a similar Component for a cropping tool software of mine, I'm going to share a toy example which uses part of that code. Differently from the rubber band in the example, my Rectangle is resizable

问题 I am porting code from qt4 to qt5. I added the following line to my .pro file, as suggested: QT += webkitwidgets However, when I run qmake , I get the this error: Project ERROR: Unknown module(s) in QT: webkitwidgets I am developing on Ubuntu 12.04 LTS and installed Qt as described. 回答1: You need to install the webkitwidgets library. On Ubuntu, try this in a terminal: sudo apt-get install libqt5webkit5-dev 回答2: If you need to install the webkit* Windows library for Qt 5.7 you should compile

问题 I am porting code from qt4 to qt5. I added the following line to my .pro file, as suggested: QT += webkitwidgets However, when I run qmake , I get the this error: Project ERROR: Unknown module(s) in QT: webkitwidgets I am developing on Ubuntu 12.04 LTS and installed Qt as described. 回答1: You need to install the webkitwidgets library. On Ubuntu, try this in a terminal: sudo apt-get install libqt5webkit5-dev 回答2: If you need to install the webkit* Windows library for Qt 5.7 you should compile

问题 I am writing a Qt application on Windows using Visual Studio 2012 . Using the Qt Add-in and a custom built static distribution of Qt 5.0.2 . I am running into the dreaded "Failed to load platform plugin windows" error whenever I run the application. I have added the following to the linker input: imm32.lib winmm.lib Ws2_32.lib qtmaind.lib Qt5Cored.lib Qt5Guid.lib Qt5Widgetsd.lib At first I thought that maybe I should add "qwindowsd.lib" to that list as well however that did not fix the

问题 I am trying to build a project using Windows 10 and Qt5.12 . The small program is using the smtp protocol available here. I can confirm that on my Windows I have the OpenSSL 1.1.1c 28 May 2019. On my Ubuntu 19.04 the same exact program compiles and run as usual but not on Windows. I git clone my repository into Windows , followed successfully this post and the program builds correctly. The problem is that when I run it, it cannot find the executable and is asking for it as it is possible to

问题 I want to connect my database(mysql) with Qt library on ubuntu 16.04. But i faced this error: QSqlDatabase: QMYSQL driver not loaded QSqlDatabase: available drivers: QSQLITE QMYSQL QMYSQL3 QPSQL QPSQL7 Result of ldd /Qt-PATH/Qt5.7.0/5.7/gcc_64/plugins/sqldrivers/libqsqlmysql.so is: linux-vdso.so.1 => (0x00007fff9d55a000) libmysqlclient_r.so.16 => not found libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007efc887eb000) libcrypt.so.1 => /lib/x86_64-linux-gnu/libcrypt.so.1 (0x00007efc885b3000

问题 I’m experimenting with Qt Positioning in Qt 5.3 RC on Android. This is sample of my code, where I create sources of position and satellites: QGeoPositionInfoSource *source = QGeoPositionInfoSource::createDefaultSource(this); if (source) { QStringList posSourcesList = QGeoPositionInfoSource::availableSources(); qDebug() << "Position sources count: " << posSourcesList.count(); foreach (const QString &src, posSourcesList) { qDebug() << "pos source in list: " << src; } source->startUpdates();

问题 I want to make a green button. I did this: self.detectButton.setStyleSheet("background: #00ff00") Here it was before the styling: And after: As you can see, the color changed, but the rounded corners were lost. What's the proper way to style the color so the corners are not lost? Secondarily, is there any way to get a theme-generic "ok" button color? This won't look the same on other platforms. 回答1: Do not use stylesheets if you want completely consistent results on all platforms. The reasons

问题 I get the "qrc:/main_left.qml:23: ReferenceError: CppClass is not defined" when I run the below code. This code tries to change the position of a rectangle in a window. Main.cpp #include <QGuiApplication> #include <QQmlApplicationEngine> #include <QQmlContext> #include "cppclass.h" #include "bcontroller.h" #include <QApplication> int main(int argc, char *argv[]) { QApplication app(argc, argv); //QGuiApplication app(argc, argv); BController c; CppClass cppClass; QQmlApplicationEngine engine;