General and Desktop

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  How to create the plugin of MYSQL for Qt
  • BlackStar  

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  @flydragon Do not duplicate posting because you do not get an answer immendiately. [edit:koahnig see https://forum.qt.io/topic/82629/why-qsqlquery-exec-exit-failed ]
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  Reporting inappropriate content on the forums
  spam • • Eddy  

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  Thank you for the report. I have banned the user, which got rid of the spam posting. Not a loss, as this user did not post any other content on the site. Just deleting this one posting was not possible. Thanks for reporting this.
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  UNSOLVED How to implement a simultaneous file editing?
  • KaanFresh  

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  UNSOLVED Creating a QGraphicsTextItem that "follows" a QGraphicsItem
  • frnklu20  

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  UNSOLVED how to add more than one characteristic to one service in bluetooth low energy
  • SherifOmran  

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  UNSOLVED missing path to "include"
  • AnneRanch  

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  UNSOLVED Highlighting text in a QTextBrowser
  • Robert Hairgrove  

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  If all you have is plain text you can just replace the formatting for the selected part like this: QTextCharFormat fmt; fmt.setBackground(Qt::yellow); QTextCursor cursor(textBrowser->document()); cursor.setPosition(start_pos, QTextCursor::MoveAnchor); cursor.setPosition(end_pos, QTextCursor::KeepAnchor); cursor.setCharFormat(fmt); If you have some formatting you will have to iterate over text blocks in that range, get the format from them, modify the color and set back.
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  UNSOLVED QTreeWidgetItem: Modifying separation between item columns
  • Alvein  

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  Hi Im don't think its possible to get columns to start in different positions pr row outside of creating a new view. However, you could use a Delegate and handling the text painting yourself and draw it as shown using the data from the model It could even allow editing if done correctly.
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  UNSOLVED stdlib.h not found
  • taku-s  

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  @taku-s said in stdlib.h not found: unix:! macx: LIBS + = -L $$ PWD /../../../../../ usr / lib / -lwiringPi INCLUDEPATH + = $$ PWD /../../../../../ usr / include DEPENDPATH + = $$ PWD /../../../../../ usr / include in addition to answer @aha_1980 questions, are those paths Ok? I can see lots of spaces
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  UNSOLVED qmake & mocing problem
  • VeNToR  

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  @Christian-Ehrlicher I solved the problem with workaround that using rsync the folders... I gonna lookup later cause'f project waits...
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  UNSOLVED Turn entire app in grayscale
  • sandro4912  

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  @sandro4912 Well you've got the mInsideRender = false; line in the wrong place, it should be either under call to paintEvent or under call to render. But even then Qt seems to warn about recursive paint event. I guess technically we do want recursion here, but just one time. So anyway - this way won't work. Sorry for turning you in the wrong direction.
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  UNSOLVED Adding text to same row, but next column?
  • SRaD  

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  Are y looking for QTreeWidgetItem::child()?
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  UNSOLVED create tablet application and avoid rotation using qtwidget
  • SherifOmran  

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  thank you guys for the notes. I usually use Qt directly to test the applicaiton on the table. So far, i know when the application is finished, i convert it to xcode and inside it, i can plug the info file. Is there an easier way to use info.plist files from inside Qt ?
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  SOLVED I can't understand the new syntax of connect
  • Mr Pang  

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  @Mr-Pang said in I can't understand the new syntax of connect: I think doc.qt.io may update the doc about QSpinBox since my syntax is copied from there. The latest version of the documentation (Qt 5.13.1) uses QOverload: https://doc.qt.io/qt-5/qspinbox.html Anyway, has your original question been answered? Do you understand the new connect syntax now?
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  UNSOLVED QT ScrollBars doesn't appear with scrollAreaWidgetContents
  qt scrollarea • • nipunamr  

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  I know this is an old thread but I just want to chip in to this. I got this exact problem trying to put anything into a QScrollBar in designer and they just don't work because of this stupid dummy "scrollAreaWidgetContents" that was auto created. It cannot be modified or deleted. The only workaround I found is to do everything in the main cpp, creating the image label and adding it to the QScrollArea object, skipping the scrollAreaWidgetContents, which completely took away the convenience of using the designer.
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  SOLVED Can a top level item have a checkbox?
  • SRaD  

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  @SRaD You are welcome. Good luck.
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  UNSOLVED QLabel->setScaledContents() does not work
  • lincoln  

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  My guess is that it is because the OP is trying to modify the pixmap in a label managed from within a dialog. The dialog is probably setting some constraints that override the setScaledContent() call.
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  UNSOLVED How to Serialize SQL Result
  • maydin  

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  Hi If by easy, you mean less code, i think QDataStream might be the winner. Like QByteArray block; QDataStream out(&block, QIODevice::WriteOnly); while (query.next()) { for all cols // not right syntax. ;) out << query.value(col) } What do you need the data for on the other side ? This will basically send it as a stream of variants. The Other side must know the types to convert to. You can send as concrete types if you wish.
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  UNSOLVED I can't find a Qt class that provides an interface to update XML in a file
  • Daniel Williams  

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  As others have covered, there are models for reading and parsing XML documents, but I believe they all expect the document to be fully read into memory. If true, then modifying an element would require reading the document into a suitable object, finding the element in question, modifying it, then traversing the tree and writing ALL its elements back to storage. I don't believe there is any edit-in-place facility for XML documents. You will need to rewrite the complete document by traversing its nodes and writing them out. All I've ever used is the QDom model so my knowledge of other mechanisms is limited. However, it should let you search for any element in question (even nested), if you know the tags.
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  UNSOLVED Moving object back to parent thread
  • ruvim  

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  Thanks for helping, SGaist! At the end I changed connect(device_thread, &QThread::finished, device_thread, &QObject::deleteLater); to connect(device_thread, &QThread::finished, this, [this, dev_id](){ this->DeleteActiveDevice(dev_id); }); and added slot void SerialDeviceManager::DeleteActiveDevice(const int dev_id) { delete active_devices[dev_id].second; active_devices.remove(dev_id); // At this point serial port connection will be with no thread affinity devices[dev_id]->moveToThread(QThread::currentThread()); }
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  UNSOLVED QList.removeAt(int index) removes wrong item
  • vlada  

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  @vlada said in QList.removeAt(int index) removes wrong item: I don't understand it... You were indeed going crazy :)
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  This topic is deleted!
  • Grove  

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  UNSOLVED Advice needed on custom buttons with different states and other special behavior.
  • parameter2  

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  @parameter2 Food for thought: I probably would implement via QPushButton, and follow @mpergand's advice to paint as desired. However, you don't have to use QPushButton just for functionality of your "click". Every widget has QWidget::mousePress/ReleaseEvent which can easily be used to recognise "click", so for example you could use a QLabel to get more control over what text/background/color etc. you want to show if QPushButton lacks, without necessarily going down the "paint" road if you don't fancy that....
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  UNSOLVED QT_DEBUG and #include <QDebug>
  • fem_dev  

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  @SGaist true! i fixed also my bad
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  UNSOLVED Lost connection to MySQL server during query QMYSQL3: Unable to reset statement
  • Chrisw01  

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  @Chrisw01 Unfortunately, https://forum.qt.io/topic/13442/qmysql3-unable-to-reset-statement reports the same from 2012 and received no replies :( https://kde-pim.kde.narkive.com/b6Avv5nE/long-running-app-loses-mysql-connection reports similar-ish, claimed resolution: using setConnectOption("MYSQL_OPT_RECONNECT=1") should automatically restore the connection if it's lost. Source code of error: https://code.woboq.org/qt5/qtbase/src/plugins/sqldrivers/mysql/qsql_mysql.cpp.html, line #1012.
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  SOLVED 'No rule to make target' after upgrading Qt on mac
  • kitfox  

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  @kitfox delete the whole Build directory by hand and than rebuild the project Simply calling clean and rebuild is not enough after an xcode/osx update
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  UNSOLVED Crash when using QKeySequence as global constant
  • Kerndog73  

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  @Kerndog73 said in Crash when using QKeySequence as global constant: Why does it crash and how do I get around this? It crashes because QKeySequence (like most other gui classes) need a QGuiApplication instance to work properly. Simply don't create any global static at all.
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  SOLVED Expanding the ‘this’ Pointer in the Debug Locals Window
  gdb terminated optimized out expanding this • • Corny  

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  I eventually became overly frustrated and I just re-installed the whole Qt package. It appears to be working fine now. Thanks so much for your assistance.
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  UNSOLVED Error with sqlite QSqlError("10", "Unable to fetch row", "disk I/O error")
  • Charlie_Billy  

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  I meant on a different physical disk like e.g. an USB key.
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  UNSOLVED QTreeView and QListWidget, how to keep selection after lost focus?
  • wqking  

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  A combination of @wqking and @Riki-P suggestions worked for me. In my app, I have both a QTreeView and a QTableView. So, I did the following in my QMainWindow-derived class. Thanks! MainWindow::MainWindow( QWidget * pParent, Qt::WFlags flags ) : QMainWindow( pParent, flags ) { ... QStringList styles; // Force views to highlight the selected rows even when the view does not have focus. QString fg = toQssFormat( palette().color( QPalette::Active, QPalette::HighlightedText ).lighter() ); QString bg = toQssFormat( palette().color( QPalette::Active, QPalette::Highlight ).lighter() ); styles << QString( "QTreeView:!active { selection-color: %1; selection-background-color: %2; }" ) .arg( fg ) .arg( bg ); styles << QString( "QTableView:!active { selection-color: %1; selection-background-color: %2; }" ) .arg( fg ) .arg( bg ); setStyleSheet( styles.join( " " ) ); ...
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  UNSOLVED Qt 5.12.4 and 5.12.5 do not have mysql plugins
  • Samuel Ives  

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  Hi, See QTBUG-76081 for the reason why.
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  UNSOLVED Strange Behaviour - Control Behaviour is set when moving mouse wheel
  • magicstar  

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  Then it might be something that is specific to your mousepad driver.
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  UNSOLVED How can I install Qt debug library while installing Qt creator?
  linux qt creator qt 5.13.1 debug libraries gcc64 • • Yash001  

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  How are you planning to distribute your library ?
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  UNSOLVED QAudioDecoder does not expose metadata (Linux, GStreamer)
  • Hazzl  

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  Hi, I haven't take a look at the code of the class but from the documentation description I would say that its goal is to play efficiently local files without all the bells and whistles provided by QMediaPlayer.
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  UNSOLVED PySide2 and string based style for quick testing...
  pyside2 qstylesheet • • Dariusz  

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  Hi, What exactly doesn't work ?
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  UNSOLVED Playing video in current window or closing last window in Qt4
  qmediaplayer qt4 • • iJeanPaul  

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  You should post the corresponding stack trace.
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  SOLVED "CDB process terminated" + IMSL C Library
  • fem_dev  

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  I found a solution. IMSL functions need the Intel MKL libraries... So, just include in the *.pro file: LIBS += -L"C:\Program Files (x86)\RogueWave\imsl\cnl-2019.0.0\winms190x64\mkl\11.3.3\lib\intel64"
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  UNSOLVED QMediaPlayer unable to seek accurately on MacOS
  • donquibeats  

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  Hi, One possible way would be to rebuild the backend with the tolerance you need.
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  UNSOLVED using D3D11 with QT5,the UI will block in multi videos display1
  • qishi20000  

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  Thanks ! You should upload the demonstration and related files on the report. That way, people can directly get it from there especially in the long run.
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  UNSOLVED Creator project file: Widgets
  • Psnarf  

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  @jsulm Thank you. I can easily delete the version check that Creator automatically inserts into the project file. There is, indeed, a lot of Qt4 still active.