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 we can disable the close [X] button in the top right corner of GUI?
  • Mijaz  

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  @Mijaz Please read again what @Gojir4 wrote: "Add setWindowsFlags(Qt::WindowCloseButtonHint, false); in your widget's constructor" https://doc.qt.io/qt-5/qtwidgets-widgets-windowflags-example.html
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  UNSOLVED A problem about QDateTime in Qt 5.9.1
  • Mihan  

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  UNSOLVED QTreeView Stylesheet: Changing anything for the ::branch removes the chevron icon
  • qwasder85  

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  UNSOLVED Error during uninstalling Qt application from MacOS
  • aliks-os  

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  UNSOLVED QIcon supports no "pressed" state (QToolButton)?
  • qwasder85  

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  Hi, Because icons have no such state and it would not make sense for them to have one. The pressed state is something that is only of concern for buttons. AFAIK, there's no workaround, change the icon for the pressed state.
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  UNSOLVED Change QComboBox popup highlighted item background color
  • qt.1234  

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  Hi! Setting stylesheet for the QComboBox doesnt work. Shown below is one of the recommendation shown in one of the link you have shared. QComboBox QAbstractItemView { selection-background-color: rgb(255, 0, 0); selection-color: rgb(200, 200, 200); } how do i go about using this? Do i use it as a stylesheet? or using setView? Selection-background-color refers to the highlighted color while selection-color refers to the font? please advice thank you!
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  UNSOLVED Is there any way to block the keyPressEvent event on the keyboard?Is there a switch method?
  • canid  

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  SOLVED OpenCV VideoCapture Failure from QThread
  qthread gui crash opencv videocapture • • rtavakko  

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  @rtavakko said in OpenCV VideoCapture Failure from QThread: it seems the crash happens only when I emit a signal containing an OpenCV matrix data pointer I don't have much experience with OpenCV, but you might need to be extra careful when passing cv::mat across different threads: https://stackoverflow.com/questions/10657841/is-cvmat-thread-safe-atomic-assignment-refcounting I don't see what in here could be causing a crash specially given that I use a const pointer. The code you posted does not show how you use cv::mat or how you emit your signal. Is there a way I could catch the exception when it happens if I can't get to the bottom of the issue? Not really. Multithreading-related memory problems cause damage long before the access violation exception is generated.
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  UNSOLVED Reading data after submit returns wrong values
  • Mark81  

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  @SGaist Unfortunately I didn't find any criteria. I'm just developing with QtCreator.
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  UNSOLVED How to normalization the tick value of QCustomPlot?
  • cyberpunker  

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  @SGaist of course
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  UNSOLVED currentChanged fires immediately upon initialization?
  • SRaD  

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  show_tab is a slot, you don't emit a slot, you emit a signal.
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  UNSOLVED How to check circular references in qtablewidget cells?
  qtablewidget • • y_belikov  

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  @y_belikov Well, follow the references until you reach the first cell (then you have circular references) or last cell without references. For the first case you actually should see whether you visit one cell more than once.
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  UNSOLVED error while deploying to remote device
  • Mijaz  

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  @jsulm Yes exactly, you are right. As my application myqt5.12_test: ELF 64-bit LSB shared object, x84-64, version 1 (SYSV) this is not working. myqt4.8.7_test: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV) this is working fine. the configuration process auto select the x84-64 architecture with ELF 64-bit LSB. I had built the qt5.12.5 without specifying the device target because when I try to specify my target then it gets the error . > collect2: error: ld returned 1 exit status > Makefile:68: recipe for target 'verifyspec' failed > make: *** [verifyspec] Error 1 Note: Also available for Linux: linux-clang linux-icc Now I am trying newly build all these files for qt 5.13.0 with compiler 4.9 ijaz@ijaz-HP-ProDesk-400-G4-MT:~/qt_5_13_configure$ ~/qt_5_13_sources/qt-everywhere-src-5.13.0/configure -release -device linux-arm-generic-g++ -device-option CROSS_COMPILE=~/qt_5_13_root/gcc-linaro-arm-linux-gnueabihf-4.9-2014.07_linux/bin/arm-linux-gnueabihf- -opensource -confirm-license -skip qtwayland -skip qtlocation -skip qtscript -make libs -prefix /usr/local/qt_5_13 -extprefix ~/qt_5_13_root/analog -hostprefix ~/qt_5_13_root/qt5_13 -no-use-gold-linker -v -no-gbm But this also returns above error Makefile:68: recipe for target 'verifyspec' failed How I can Build for my device "arm" ?
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  SOLVED a function-definition is not allowed here before ‘{’ token
  • AntonioValentin  

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  @AntonioValentin As @JonB wrote: that bunch of code is outside of any function/method and is invalid for that reason. Also if saying error is in line 255 you could at least mark that line in the code you posted, because else people have to count the lines to find out which line that actually is (and this only works if you posted whole content of the file).
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  UNSOLVED Couldn't use QPainter in a function.
  • Shoaib Muhammad  

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  @Shoaib-Muhammad said in Couldn't use QPainter in a function.: I tried just calling drawEmptyGraphs(); but I had an error stating a slot and signal mismatch. Please show your code. Calling a method does not have anything to do with signals/slots. void CGui::clickCnts(){ if (StartFlag == 0) { StartFlag = 1; qDebug() << "CGui: Processing Started..."; CntsBtn->setText("STOP"); /* Axis Values replaced here based on min and max*/ drawPlot(); } else { StartFlag = 0; qDebug() << "CGui: Processing Stopped!"; CntsBtn->setText("CONTINUOUS"); drawEmptyGraphs(); } }
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  UNSOLVED About QSerialPort
  qserialport qt 5.12 • • ALONELUR  

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  You can get information about the available serial ports using the QSerialPortInfo helper class, which allows an enumeration of all the serial ports in the system. This is useful to obtain the correct name of the serial port you want to use.
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  UNSOLVED Regarding Projector Programming using QT
  • Prath  

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  Hey @SGaist , after running the above programme , a GUI pops out. We have to send a command to the projector using the GUI. However, I couldn't send any commnad as nothing could be written on the GUI window.
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  UNSOLVED QComboBox item model with ItemIsUserCheckable and ItemIsSelectable
  • Alvein  

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  @JonB ItemIsSelectable seems to have precedence over ItemIsUserCheckable. So, mixing the two flags, does not show the checkboxes. The problem with not using ItemIsSelectable is that the clicks over the items text are not being registered. So there's no way of knowing when the click wasn't over the check boxes. BTW, I don't think this behavior is so rare. I'm pretty sure a lot of applications register clicks on a check box text as if they were in the check box itself. It's a pity that it's not possible to add widgets inside combo boxes. I'll have to either implement a drop-down list widget or forget the dual behavior and just add a selectable "Done" item at the end of the list (and annoy the user in the process, because of the lack of clicks registering over the other items text).
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  UNSOLVED How do I stop repainting on scroll
  • lansing  

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  @SGaist I'm using Qt 5.13.2 and Windows 10. In my ui file, I created a graphicsView object. mainwindow.cpp scene = new QGraphicsScene(this); myItem = new CustomerGraphicsItem(); scene->addItem(myItem ) ui->graphicsView->setScene(scene) mycustomeitem.cpp void CustomerGraphicsItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) { QBrush blackBrush(Qt::black); painter->fillRect(boundingRect(), blackBrush); painter->drawText(blah blah blah) qDebug() << "printing..."; } The program redraw every time I move the scroll bar or resize my window.
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  UNSOLVED Qt3DCore - High CPU Usage
  • webzoid  

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  @webzoid said in Qt3DCore - High CPU Usage: Steps to recreate: I tried to follow your steps on Qt 5.13.0 for MSVC 2017 32-bit, but the window was blank. So I ran the Basic Shapes Example on Qt 5.13.0 for MSVC 2017 32-bit. Sitting idly, the CPU did not exceed 4%. I have a Intel Core i7 4710HQ @ 2.50GHz + 2048MB ATI AMD Radeon R9 M265X. What hardware are you using? What happens when you run the Basic Shapes example?
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  UNSOLVED QNetworkAccessManager gives an error
  • MStackoverflow  

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  @SGaist I am using Qt 5.12.3, Visual Studio 2017, and platform windows. Qt version: I have same issue. My application is work fine but compiler output is printing Invalid parameter passed to C runtime function. . I copy update openSSL libraries at $(OutDir) of my application. still got same warning. Below code I try on separate project. #include <QtCore/QCoreApplication> #include <qnetworkaccessmanager.h> int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); QNetworkAccessManager networkAccess; return a.exec(); } Compile Output: Qt VS Tools: QML debug: Debugging project 'NetworkAccess'... Qt VS Tools: QML debug: DISABLED: QML debugging disabled in Qt project settings 'NetworkAccess.exe' (Win32): Loaded '***********\NetworkAccess\debug\NetworkAccess.exe'. Symbols loaded. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\ntdll.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\kernel32.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\KernelBase.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Program Files\AVAST Software\Avast\x86\aswhook.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Qt\5.12.3\msvc2017\bin\Qt5Networkd.dll'. Symbols loaded. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\advapi32.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\msvcrt.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\sechost.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\rpcrt4.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\sspicli.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\cryptbase.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\bcryptprimitives.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\crypt32.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\ucrtbase.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\msasn1.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\ws2_32.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Qt\5.12.3\msvc2017\bin\Qt5Cored.dll'. Symbols loaded. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\user32.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\win32u.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\gdi32.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\gdi32full.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\msvcp_win.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\shell32.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\cfgmgr32.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\SHCore.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\combase.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\windows.storage.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\profapi.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\powrprof.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\shlwapi.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\kernel.appcore.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\cryptsp.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\ole32.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\vcruntime140d.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\ucrtbased.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\dnsapi.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\nsi.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\IPHLPAPI.DLL'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\msvcp140d.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\mpr.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\netapi32.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\userenv.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\version.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\winmm.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\winmmbase.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\netutils.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\srvcli.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\imm32.dll'. Cannot find or open the PDB file. The thread 0x1cf8 has exited with code 0 (0x0). 'NetworkAccess.exe' (Win32): Loaded 'C:\Qt\5.12.3\msvc2017\plugins\bearer\qgenericbearerd.dll'. Symbols loaded. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\dhcpcsvc6.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\uxtheme.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\dhcpcsvc.dll'. Cannot find or open the PDB file. 'NetworkAccess.exe' (Win32): Loaded 'C:\Windows\SysWOW64\dwmapi.dll'. Cannot find or open the PDB file. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. Invalid parameter passed to C runtime function. The thread 0x3838 has exited with code 0 (0x0). The program '[4452] NetworkAccess.exe' has exited with code 0 (0x0). Do you want me try any other things ? @MStackoverflow did you solve issue?
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  SOLVED Manually Setting NSAccessibility Value on Mac for QAccessibleWidget?
  mac accessibility • • ChiK  

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  Glad you found a solution ! Would you mind sharing the changes you made ? You might even consider including them in Qt directly ?
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  UNSOLVED Video frames from web camera cannot be decoded with newer Qt versions
  • cristeab  

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  Hi Thanks for your quick reply. OS is Windows 10, for the hardware not sure yet, I'll came back later. We didn't tried with Qt 5.12.0 Bogdan
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  UNSOLVED Best way to process cv::Mat 's in threads? intell tbb & QThread with event messaging or QThrealPoll ?
  • RahibeMeryem  

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  That I understood but extracting/processing frames from small sized streams is not the same as doing in for 4k streams. IIRC, OpenCV provides support for GPU processing, that might be an interesting option. QThreadPool might be more interesting as it will use as much threads as it makes sense. In any case, TBB might be a nice tool to learn.
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  UNSOLVED set root directory for qFileDialog()
  • nima.latifi  

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  Hi, I don't remember exactly but maybe using a proxy model might do the job can get you the result you want.
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  UNSOLVED Error while building/deploying project Qmake
  • scholaraniket  

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  Hi and welcome to devnet, Might be a silly question but do you have make installed on your system ?
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  UNSOLVED QStackedWidget with multiple classes
  qstackedwidget qstackedwidgets • • hobbyProgrammer  

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  Hi, You don't call show on your sw object and it's not part of your stacked widget.
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  SOLVED Hide widget if parent window width <widget.width ?
  qwidget qlayout qsizepolicy • • Dariusz  

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  @SGaist I ended up hocking up to resize event of parent widget to find out when size changed & resize my other widget acordingly. I ended up using "invisible" QLabel that retains size as my "spacer". I had to change its spacing role on the go depending of one or more widget are visible or not as I needed to retain correct order. So far works great. TIA
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  UNSOLVED Styling a QCheckBox on demand
  • donquibeats  

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  Hi, There's nothing fundamentally different between the C++ and Python with regard to the stylesheet handling. See the Customizing QCheckBox part of the stylesheet examples.
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  UNSOLVED No Taskbar Icon on QDialog is shown before mainwindow.show() is called.
  • Chrisw01  

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  @Chrisw01 said in No Taskbar Icon on QDialog is shown before mainwindow.show() is called.: I've figured this out.. So is it time to mark your post as solved? Thanks.
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  UNSOLVED Trying to open and read a .txt file, but it deletes the actual text from the original file
  • windygrass32  

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  @mpergand said in Trying to open and read a .txt file, but it deletes the actual text from the original file: In fact I'm suprised that the file is emptied Doc: QIODevice::WriteOnly: The device is open for writing. Note that, for file-system subclasses (e.g. QFile), this mode implies Truncate unless combined with ReadOnly, Append or NewOnly.
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  UNSOLVED SetTitlebarWidget & its height
  qwidget • • Dariusz  

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  @SGaist said in SetTitlebarWidget & its height: Hi, You should show your widget implementation. Its something like fo = QDockWidget() fo.show() w = QPushButton("yoyoyooy") w.setMaximumHeight(10) fo.setTitleBarWidget(w) The PushButton is x pixels below top of window, so the title bar is still xx height.
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  UNSOLVED QTreeView branch drawing... missing branch?
  qtreeview qstyle • • Dariusz  

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  In fact, it's the QTreeView::drawBranch that handles that.
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  UNSOLVED std::array or QVector
  • sandro4912  

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  Then use std::array since it suites your needs.
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  UNSOLVED Using QCustomPlot with Qt Quick (QML) instead of QWidget?
  qml qtcreator qcustomplot • • SpaceToon  

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  @vmanso said in Using QCustomPlot with Qt Quick (QML) instead of QWidget?: @SpaceToon Why not just use QtCharts instead of QCustomPlot ? https://doc.qt.io/qt-5/qtcharts-index.html But is it possible du plot sensor data via Bluetooth Low Energy in real time like this: Click for the video
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  UNSOLVED CSS padding inside QTabWidget tabs hiding text
  css qtabwidget qtabbar • • drdydx  

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  @Chris-Kawa Maybe you can ping @AndyS again so we can take a look on it. I had no time for it to think about an own patch.
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  UNSOLVED How to accelerate the selection in the QTableView ?
  • cyberpunker  

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  How should your second approach work when you don't pass it to the selection model? And doing stuff for a model/view in a thread will not work out of the box since the models and views are not threadsafe
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  UNSOLVED Check button press of QMessageBox
  • hobbyProgrammer  

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  @JonB Ah, thx. so Poster knows about toplevel windows etc. No reason to get into that again then :)