The error is pretty clear. QMouseEvent *mouse; – you declare a pointer to the a QMouseEvent, but where is it instantiated? This is only a pointer which points to something. If you want to handle mouse events you probably have to overload some kind of widget’s mouse event (mouseMoveEvent, mousePressEvent, etc.). Those will provide you … Read more
Use QString as primary string type: QString result = QString(“apg -q -n %1 -x %2 -y %3”).arg(n).arg(x).arg(y); Or use a QTextStream to assemble everything. QString result; QTextStream ts(&result); ts << “apg -q -n ” << n << ” -x ” << x; To use std::string with .arg(): std::string x = “xxx”; QString result = QString(“xxx … Read more
you’re getting this error code error: no matching function for call to ‘QStylePainter::drawItemPixmap(QRect&, Qt::AlignmentFlag, QIcon&)’ painter.drawItemPixmap(opt.rect, Qt::AlignCenter, opt.icon); because drawItemPixmap draws… a pixmap. Not an icon. So all you need to do is get the icons pixmap using the pixmap() accessor. change painter.drawItemPixmap(opt.rect, Qt::AlignLeft, opt.icon); to // or whaever size you want painter.drawItemPixmap(opt.rect, Qt::AlignLeft, opt.icon.pixmap(QSize(16,16))); … Read more
Finally I realized what was the problem it was in displaying the encrypted and decrypted strings when I tried result=QString::fromLocal8Bit((char*)ciphertext); it worked fine and showed the original text. solved Wrong Encryption (QT c++ OpenSSL AES 256 CBC)
The solution comes in three parts. Separately compile the cpp file into a .o object. I’m not going to talk about this step as I was able to use pre-compiled .o files for the third party library I was using. Apparently they were aware of the issue as well and prepared .o files for all … Read more
Finally I got One approach, which I think best to write QML to FrameBuffer Find the sample here using QQuickRenderControl, to write qml component into a framebuffer and save as PNG Time Elapsed to update QML and Render as QImage(1080X1920): 7ms to 15 ms(Ubuntu OS Lenovo 6th Gen Laptop) solved Best Approach to capture QML … Read more
Depending on the file structure (does it contain line/column headers, single/multi-line?) you use QString::split() to get a QStringList per line. Then you assign the stringlist items to the variables according to your csv structure knowledge. 0 solved Qt separating csv file and storing to differnt variables
As some of the commentors mentioned it appears this kind of problem is most often caused by trying to compile the same file twice. Including an implementation (.cpp) file is a quick way to do this. Another way to compile a file twice is to include it twice in the project, which is what created … Read more
Yes, the Qt Creator for Windows installer includes Mingw. (Clang isn’t really in a usable state at the moment for Windows.) Note however that the included Mingw version may be badly out of date. 1 solved Is “Qt Creator 2.4.1 for Windows (53 MB)” includes mingw or clang? [closed]
I will try to help you to get started: QList is std::list QStringList is basically QList < QString > , so it is the same std::fstream can be used for QFile QIODevice is maybe std::fstream, but I am not sure Again std::fstream can be used for QTextStream 3 solved How to convert Qt to C++? … Read more
main.qml import QtQuick 2.6 import QtQuick.Window 2.2 import QtQuick.Controls 1.4 Window { id:appWindow visible: true width: 640 height: 480 title: qsTr(“Hello World”) property int count: 0 signal forward function fun1(argument1){ console.log(“A function fun1()in the main QML file is invoked by dynmic object”) console.log(“Returned parameter from the QML dynamic objects = “, argument1) } Item { … Read more
QwtRasterData is an abstract class that defines an interface to gridded data for display in the Qwt framework. There exists a subclass, QwtMatrixRasterData that lets you create raster objects with actual values in them from a QVector of doubles using the setValueMatrix method. You could write another subclass QwtRdaRasterData that defines the methods of the … Read more