Questions tagged [qt5]
Questions specifically for version 5.x of the Qt library. If your question applies to other versions of Qt, use the tag [tag:qt4] or [tag:qt3]. It is recommended to use with the tag [tag:qt].
8,765
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Problem embedding qquickview into qlayout
I'm using multi-threaded opengl in my qml so qquickwidget is not an option, when I use qwidget::createwindowcontainer to manage qquickview and embed it into qlayout it works fine .
but if I take it ...
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38
views
TableViewColumn in Quick.Controls 2.15
I need to rewrite the view from QTableView to qml when using quick.controls 2.15 in qt 5.15 in quick 2.15. I have a c++ model, but I need to display them in a table, with the ability to display them ...
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39
views
AIX: C++ application with shared Qt5Core lib dependency has thread-local-storage runtime issue
I am on IBM AIX-7.2 and have this sample C++ code:
#include <QtCore/QCoreApplication>
#include <QtCore/QDebug>
#include <QtCore/QDateTime>
#include <cstring>
int main(int argc,...
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23
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How to use pyqtSlot() without @
I need to create a method in a foreign PyQt5 window class at runtime (that will be called later from a different thread with QMetaObject.invokeMethod()). Therefore I cannot use the decorator style. Is ...
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29
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"make: *** There is no rule to build target "sub-mysql". Stop." error when trying to create a MySQL driver with Qt
I'm trying to install the QMYSQL driver on Ubuntu 24.04 LTS with Qt version 5.15.3, but I'm running into some issues.
Problem:
The sqldrivers directory only contains the SQLite driver, and I'm missing ...
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-2
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0
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41
views
QSqlQuery is not meant to be copied
I have defined a QSqlDatabase as follows:
QSqlDatabase m_db;
And use it repeatedly for each new query as follows:
QSqlQuery query(m_db);
query.prepare(querystring);
success = dbquery(query,...
- 4,506
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votes
0
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51
views
Install Qt5 libraries on Debian 12
I would like to install the Qt5 libraries onto Debian 12, but I do NOT want Qt Creator. I just want to be able to compile a C++ app which uses Qt5. And I would like to use packages from default ...
- 4,506
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17
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(Qt version 5.15.3) This application failed to start because it could not find or load the Qt platform plugin "xcb"
when i run qtcreator like this ./qtcreator, the error come out
enter image description here
and the ubuntu version is 22.04 ,qmake version is 3.1
enter image description here
i have tried many ...
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-1
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0
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53
views
Data sent from CPP causes interface crash in QML
first of all, I have a problem like this. I want to transfer the data to the QML side with a signal from C ++, but after a while my interface crashes without giving any error. I can't find the reason ...
- 13
-1
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45
views
Building Qt 5.15.1 from source code but facing issues with configure
I am trying to build Qt 5.15.1 by cloning the repo and following the README but I came across an issue an issue.
Everything went seemingly well till the step where I needed to run the configure file ...
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63
views
Qt QModel view use QSortFilterProxyModel fucntion is so slow，something wrong？ [closed]
I use Qt Model view with QSortFilterProxyModel
QListView with checkbox and name ，only one column
QStandardItemModel setData ,100w row
use QSortFilterProxyModel function setFilterFixedString
and add a ...
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-1
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0
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51
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How to create customized barcode in qt c++?
I'm using qt 5.15
i have to develop application for Code 128 barcode generator and now I want to reduce the barcode strips. How do I create customized barcode strips?
My code is below,
Code128.h
#...
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2
votes
1
answer
47
views
Q_DECLARE_METATYPE results in assert failure after upgrading from Qt 4.8 > 5.15
I have a large file which uses these macros:
Q_DECLARE_METATYPE(boost::function<void()>);
Q_DECLARE_METATYPE(boost::function<void(const QPoint&)>);
But sadly after upgrading from Qt 4....
- 53
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30
views
Visual Studio Code doesn't display visualized Qt5 objects on Linux
Using VSCode 1.85.2.
I have qt5.natvis on my Linux CentOS 7, and my launch.json file includes the following properties:
{
...
"visualizerFile": "/path/to/qt5.natvis",
...
- 605
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0
answers
32
views
In QT6.5, when using QGraphicsView to center an image, the white space outside the image cannot be displayed, resulting in a centering failure
As shown in Figure 1, I want to implement clicking on the green rectangle to jump the green rectangle to the center, and if the green rectangle is closer to the border, it should be centered and ...
0
votes
3
answers
65
views
C++ with Qt5 : lock a common mutex before calling the actual override implementation of a method
I have an abstract class like this :
class Thing
{
public:
Thing();
virtual ~Thing();
static QMutex s_mutex;
virtual void load() = 0;
virtual void translate() = 0;
virtual ...
- 1,163
0
votes
1
answer
13
views
Non-symmetric mutex
I have an unknown number of processes that create independent data, and one function that modifies all existing data. I need to be able to prevent the modification of data when it is being created (or ...
- 1,163
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votes
2
answers
49
views
The signal emmited from UnixDomain datagram socket server running on a QThread never received
The Files which I've created
I've created WorkerThread class extended QThread as follow:
// https://stackoverflow.com/a/14546167/11073131
#ifndef THREAD_H
#define THREAD_H
#include <QThread>
#...
- 821
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39
views
Writing a theme manager for QML 5 application that uses the Material theme benefits while it can be extended
I want to implement a ThemeManager component that uses the Material theme inside while it is extensible via adding properties.
I have two files for my custom themes:
CustomDarkTheme.qml:
import ...
- 571
3
votes
1
answer
57
views
MiterJoin is ignored for single-pixel width pen
Problem
When drawing a rectangle with a line width of 1px on a QPainter with antialiasing enabled results in slightly transparent corners regardless of what JoinStyle is set. The same can be observed ...
- 334
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2
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48
views
ui_mainwindow.h: No such file or directory: Compile Qt with MSYS2
I want to compile a Qt-Project without an IDE like QtCreator and I use MSYS2.
I installed Qt5 with
pacman -S mingw-w64-x86_64-qt5-base
I could then already create an application with
main.cpp
#...
- 434
1
vote
1
answer
145
views
Use OpenCV in qt qmake project: undefined reference
I want to use OpenCV in a QT qmake project. The vrsions are opencv 4.9.0 and QT 5.15.2(MSV 2019,64bit).
.pro file
INCLUDEPATH += C:/opencv/build/include
LIBS += -LC:/opencv/build/x64/vc16/lib \
...
- 2,025
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0
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43
views
MPR Viewer in Qt/VTK: Slices not displaying in Axial, Coronal, and Sagittal views
I'm a beginner in developing Qt/VTK applications and I'm working on creating a multiplanar reconstruction (MPR) viewer.
I successfully load the DICOM data path using appropriate methods. The volume ...
0
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0
answers
70
views
QSqlDatabase: QPSQL driver not loaded in Qt5 on Ubuntu 20.04 - Available drivers: ()
I'm developing an application using Qt5 on Ubuntu 20.04, and I need to connect to a PostgreSQL database. However, I'm encountering an issue where the QPSQL driver isn't loaded. Here's the error ...
- 15
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0
answers
42
views
Openssl library ARM execution TLS and Incompatible version of OpenSSL Failure
I am trying to run an Application to use http url images(for display) that uses the openssl 1.1.1d version for the Qt Framework on the ARM platoform. I was able to build the openssl 1.1.1d for ARM and ...
0
votes
1
answer
40
views
Change delegate if listelement is true
I am trying to use Pathview to show a carousel, when an element in my model has a certain field set as true, I would like to display an image next to the item in the carousel.
I have tried to mock up ...
- 3
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32
views
How do I get started with using Qwt with a Yocto Image?
I want to know the steps involved to develop Qt application that utilize Qwt source, for a remote target, or which I'm building a distribution using Yocto. Here's the guide that I've been following: ...
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0
answers
78
views
CMake error when trying to install latte-dock from github repo
I am using Arch with Kde plasma.
I was trying to install latte-dock and in some videos it showed that you could do that by simply using pacman -S latte-dock, but now the package cant be found anymore, ...
1
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0
answers
44
views
DBus get stuck on compositor start
We use a Wayland compositor written in Qt5 to start and show some other applications written in Qt5 on an embedded Linux display computer.
All the applications and the compositor are using the DBus, ...
0
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1
answer
53
views
Can't open MS Word document (.docx) as a resource in QT
With the past method, I opened the document directly specifying the exact path
QAxObject *wApp = new QAxObject("Word.Application");
auto docs = wApp->querySubObject("Documents");...
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