[ad_1] 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 … Read more
[ad_1] 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 = … Read more
[ad_1] 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, … Read more
[ad_1] 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. [ad_2] solved Wrong Encryption (QT c++ OpenSSL AES 256 CBC)
[ad_1] 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 … Read more
[ad_1] 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) [ad_2] solved Best Approach to … Read more
[ad_1] 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 [ad_2] solved Qt separating csv file and storing to differnt variables
[ad_1] 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 … Read more
[ad_1] 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 [ad_2] solved Is “Qt Creator 2.4.1 for Windows (53 MB)” includes mingw or clang? [closed]
[ad_1] 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 [ad_2] solved How to convert Qt … Read more
[ad_1] 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
[ad_1] 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 … Read more