Hi and welcome to devnet, What version of Qt are you using ? How did you install it ? If using your distribution package manager, then check if you installed the related Qt 5 package.

@mrjj I want to run the open source provided here http://www.xpdfreader.com/. In Windows. freetype.dll zlib.dll libpng.dll Where can I put in the build folder? Runs on qt with cmakelist, no .pro files are visible.

In this moment, these modules don't work

After configuring ,I am getting the errors ERROR: Feature 'opengles2' was enabled, but the pre-condition '(config.win32 && !features.opengl-dynamic) || (!config.watchos && !features.opengl-desktop && libs.opengl_es2)' failed. ERROR: Feature 'egl' was enabled, but the pre-condition '(features.opengl || features.openvg) && (features.angle || libs.egl)' failed. ERROR: Feature 'eglfs' was enabled, but the pre-condition '!config.android && !config.darwin && !config.win32 && !config.wasm && features.egl' failed. ERROR: The OpenGL functionality tests failed! You might need to modify the include and library search paths by editing QMAKE_INCDIR_OPENGL[_ES2], QMAKE_LIBDIR_OPENGL[_ES2] and QMAKE_LIBS_OPENGL[_ES2] in the mkspec for your platform. while checking the config.log file,i understood in my sysroot ,I dont have the libegl packages,how to install those packages? please guide me.... in my qmake.conf file QMAKE_INCDIR_EGL= QMAKE_LIBDIR_EGL= this both are empty...what i need to specify there...below is the attachement of my qmake.conf file please go throught that one..... code_text# # qmake configuration for the BeagleBoard and BeagleBoard xM boards # http://beagleboard.org/ MAKEFILE_GENERATOR = UNIX CONFIG += incremental QMAKE_INCREMENTAL_STYLE = sublib include(../../common/linux.conf) include(../../common/gcc-base-unix.conf) include(../../common/g++-unix.conf) load(device_config) QT_QPA_DEFAULT_PLATFORM = eglfs # modifications to g++.conf QMAKE_CC = $${CROSS_COMPILE}gcc QMAKE_CXX = $${CROSS_COMPILE}g++ QMAKE_LINK = $${QMAKE_CXX} QMAKE_LINK_SHLIB = $${QMAKE_CXX} # modifications to linux.conf QMAKE_AR = $${CROSS_COMPILE}ar cqs QMAKE_OBJCOPY = $${CROSS_COMPILE}objcopy QMAKE_NM = $${CROSS_COMPILE}nm -P QMAKE_STRIP = $${CROSS_COMPILE}strip COMPILER_FLAGS = -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mthumb #modifications to gcc-base.conf QMAKE_CFLAGS += $${COMPILER_FLAGS} QMAKE_CXXFLAGS += $${COMPILER_FLAGS} QMAKE_CXXFLAGS_RELEASE += -O3 QMAKE_LIBS += -lrt -lpthread -ldl # Extra stuff (OpenGL, DirectFB, ...) QMAKE_INCDIR_EGL = QMAKE_LIBDIR_EGL = QMAKE_INCDIR_OPENGL_ES2 = $${QMAKE_INCDIR_EGL} QMAKE_LIBDIR_OPENGL_ES2 = $${QMAKE_LIBDIR_EGL} QMAKE_INCDIR_OPENVG = $${QMAKE_INCDIR_EGL} QMAKE_LIBDIR_OPENVG = $${QMAKE_LIBDIR_EGL} QMAKE_LIBS_EGL = -lEGL -lIMGegl -lsrv_um QMAKE_LIBS_OPENGL_ES2 = -lGLESv2 $${QMAKE_LIBS_EGL} QMAKE_LIBS_OPENVG = -lOpenVG $${QMAKE_LIBS_EGL} DISTRO_OPTS += hard-float # No need for any special EGL device integration. # Prioritize the default, compiled-in integration over any plugins. EGLFS_DEVICE_INTEGRATION = eglfs include(../common/linux_arm_device_post.conf) load(qt_config)

I took out that line completely, added the patch, and then ran qmake and nmake again but have the same error as before. A whole bunch of red lines with "unknown warning option" and other stuff in it. And I don't know why the -Werror option is being passed to the compiler backend. I also have to forcibly close the window using the red button because just giving it the keyboard interrupt isn't enough. Note: This is one part of the stream of errors: error: unknown warning option '-Wno-int-in-bool-context'; did you mean '-Wno-gnu-include-next'? [-Werror,-Wunknown-warning-option] error: unknown warning option '-Wno-int-in-bool-context'; did you mean '-Wno-gnu-include-next'? [-Werror,-Wunknown-warning-option] shared:ERROR: 'C:/emsdk/upstream/bin\clang.exe -target wasm32-unknown-emscripten -D__EMSCRIPTEN_major__=1 -D__EMSCRIPTEN_minor__=38 -D__EMSCRIPTEN_tiny__=46 -D_LIBCPP_ABI_VERSION=2 -Dunix -D__unix -D__unix__ -Werror=implicit-function-declaration -Xclang -nostdsysteminc -Xclang -isystemC:\emsdk\upstream\emscripten\system\include\libcxx -Xclang -isystemC:\emsdk\upstream\emscripten\system\lib\libcxxabi\include -Xclang -isystemC:\emsdk\upstream\emscripten\system\include\compat -Xclang -isystemC:\emsdk\upstream\emscripten\system\include -Xclang -isystemC:\emsdk\upstream\emscripten\system\include\libc -Xclang -isystemC:\emsdk\upstream\emscripten\system\lib\libc\musl\arch\emscripten -Xclang -isystemC:\emsdk\upstream\emscripten\system\local\include -Wno-int-in-bool-context -c -Werror -Os -fno-builtin -Wno-return-type -Wno-parentheses -Wno-ignored-attributes -Wno-shift-count-overflow -Wno-shift-negative-value -Wno-dangling-else -Wno-unknown-pragmas -Wno-shift-op-parentheses -Wno-string-plus-int -Wno-logical-op-parentheses -Wno-bitwise-op-parentheses -Wno-visibility -Wno-pointer-sign -Wno-absolute-value -Wno-empty-body -Wno-int-in-bool-context -IC:\emsdk\upstream\emscripten\system\lib\libc\musl\src\internal -IC:\emsdk\upstream\emscripten\system\lib\libc\musl\arch\js -DEMSCRIPTEN C:\emsdk\upstream\emscripten\system\lib\libc\musl\src\stdlib\qsort.c -fno-inline-functions -Xclang -isystemC:\emsdk\upstream\emscripten\system\include\SDL -c -o C:\Users\Osman\AppData\Local\Temp\emscripten_temp_bduibeac\qsort.c.o -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr' failed (1) Actually it did end on its own this time. I'll be able to give you a log file after running nmake 2> build.log now. Here's a link.

Thanks for your suggestions! Unfortunately it's still either no binding or error message, if I don't use a dummy property. [At first I had though this to work, but that was a mistake on my side] But by now I know the problem. It is actually a bug that was introduced with 5.11->5.12 and has been fixed in 5.12.5 / 5.13.1. I've had tested it with 5.12.3 and 13.0 :-) Here's the bug: https://bugreports.qt.io/browse/QTBUG-76796 Here's the fix: https://codereview.qt-project.org/c/qt/qtdeclarative/+/266776 The best solution, of course, would be to load the QML page after the contextProperty is set to the engine. I can and will do that with my current and future code. For my legacy code this bug would have meant a huge amount of work - or an almost equal amount of (ugly) patching. I am very happy, that this bug has been fixed! I will just upgrade. Thank you for time, effort and creative input!

Hi and welcome to devnet, What version of Qt are you using ? On what OS ? You should show the code you use so it can also be reproduced by other people here.

@Chris-Kawa Chris, you are "THE MAN". I do not have much time to reply. At this point I see Qt Creator as these "puzzle parts" and estimated percentage of my understanding how the parts fits into the whole C++ 99% project 80% main 90% mainwindow need to really read and digest your post application class 50% My next concern is I can instantiate the app class in "main" I can execute "button press" on mainwindow the missing piece is how to execute app class function . As stupid as it sounds , my guess is the app class instance is in wrong place thus still showing I do not fully get the relations between the GUI class "mainwindow" and "main". and the app class of course.

Yes, but I read "Other modules are generally untested and may work", maybe its better to write only what works, because is explicitly wrote that only "Not supported: QtMultimedia, QtWebView". However, thanks for your advice. "Supported Qt Modules Qt for WebAssembly supports a subset of the Qt modules. The following lists the currently tested modules. (You can can paste in the list as arguments to "make", which should then build the modules) module-qtbase module-qtdeclarative module-qtquickcontrols2 module-qtwebsockets module-qtsvg module-qtcharts module-qtmqtt Other modules are generally untested and may work. Not supported: QtMultimedia, QtWebView "

You can only paint inside QGrpahicsItem::paint()

Why do you spin an eventloop instead properly relying on signals/slots? When I first started programming with Qt I relied heavily on examples that I found over the internet. I could not find any good examples of retrieving API JSON data on the Qt website and had to rely on other sources. The code you see is a combination of examples I found that I got to work for the past 2 years. Now, with the advent of 5.13.1, the code does not work and will probably need to be updated to the proper signal / slot procedure which may fix the crash issue. Where does it crash? The function crashes the SECOND time it runs the function right at: reply->deleteLater(); I added a qDebug() right before it and after it. The first time through both qDebug()s echo'd out the info. The second time through only the first qDebug() echo'd out info and then crashed on the reply->deleteLater() line. I would like to Add One thing I would like to add, not sure if this would play a part. All these calls are being made from child windows (classes). I create a pointer object in a child window (class) in the construct function that points to the MainWindow class, then I call the api GET function that resides within the MainWindow class like: //mw is a pointer to the MainWindow class QJsonObject api_info = mw->getRequest("some/api/link").object();

@Mijaz You're using new connect() syntax which was introduced in Qt5. If you want to use Qt4 also then you have to use old syntaxt (the one with SIGNAL/SLOT macros).

@AdemMetinCALI said in How to add an image at a specific area in QGraphicsScene: i want to add more picture in different areas of the scene. I'm trying to understand your requirements. Could you please clarify: How many "large images" are you using? Do you use the same "large image" all the time, or do you keep loading a different "large image" Are you trying to cut the large image into smaller pieces, and draw each small piece in a different part of the scene? If you answer "yes" to #2, that means you want to make sprites. See https://evileg.com/en/post/92/ for example. i think your solution causes performance issues. I try to build a hud and it has many symbology. How can i deal with the performance issues? Why do you think there are performance issues? How serious are they?

hi @LenaTodnem, have you added QT += websockets to your pro file? Regards

Hi and welcome to devnet, What properties as different ? If for example size related, a widget that hasn't been shown doesn't have a size.

@bogong said in Gherkin syntax highlighting in Qt Creator. How?: Is there any option to highlight Gherkin syntax in Qt Creator? Not out-of-the-box, because Gherkin has no relation to Qt. If Gherkin has a language server, you can integrate it into Qt Creator using https://doc.qt.io/qtcreator/creator-language-servers.html Otherwise, you can write your own Gherkin plugin for Qt Creator: https://doc-snapshots.qt.io/qtcreator-extending/first-plugin.html

@SGaist I have two scripts in python, the first: is the interface and the second: is the script of gnuradio that detect signals of wifi

I have fixed the issue by adding #undef X64 before #include "winrt/Windows.System.Diagnostics.h". For some reason this define conflicts with the ProcessorArchitecture::X64 enum in Windows.System.0.h as stated by VVV user from: https://stackoverflow.com/questions/58436766/qt-with-winrt-c-build-issue/58440774#58440774. The issue is resolved.

Despite the Qt version, most of the book is still relevant for Qt 5.

@matio I compiled vlc-qt on raspbian os. Also don't use "make -j8" command just use "make" or may be "make -j4"

Did you already tried using the VideoOutput QtQuick type ?

@kuzulis said in How is Qt source code itself tested?: A main problem is that the Qt-guys discarted my suggestion about installing to the CI the virtual serial ports: Can you create a bugreport for that and assign the QA team? Then we can increase the pressure on them. It is just a pity that the tests exist but cannot be run automatically.

Hi, Any chances that you have non-ascii chars in your user name ?

That would be very nice ! Thanks

Did you check that the environment variable is set properly ? Do you have it in your project's environment variable ?

Hi, From what I recall, I think the simple road would be to pass the QIODevice you get from QAudioOutput to the callback and write the chunk of data you get there directly to it.

Hi, From the top of my head I would try to use QDesktopWidget and QScreen to query the geometry of the whole desktop and set your widget to that. Hope it helps

Hi, You can use a QIdentityProxyModel between your orignal data and your view. You can alter there just what you want.

It may save other time. Call below function from installer.qs for creating *.desktop file you can call prototype by this. desktopFileCreateOnLinux() from any function in side component script. Below script will create the two place *.desktop file. inside the @TargetDir@/ inside ~/.local/share/applications/ (it will help while searching from Show application). prototype definition: Component.prototype.desktopFileCreateOnLinux = function() { if ((systemInfo.kernelType === "linux") ||(systemInfo.kernelType === "Linux")) { var dir = installer.value("TargetDir"); component.addOperation("CreateDesktopEntry", "Squidstat.desktop", "Type=Application\nName=Squidstat\nExec=\'"+dir+"/SquidStat.sh\'\nGenericName=The IDE of choice for Squidstat handle.\nIcon="+dir+"/Squidstat.png\nTerminal=false\nCategories=IDE;Qt;"); component.addOperation("CreateDesktopEntry", "@TargetDir@/Squidstat.desktop", "Type=Application\nName=Squidstat\nExec=\'"+dir+"/SquidStat.sh\'\nGenericName=The IDE of choice for Squidstat handle.\nIcon="+dir+"/Squidstat.png\nTerminal=false\nCategories=IDE;Qt;"); } }

@t0msk @SGaist wrote Did you move the connection statements as I suggested ? In your code you show: QNetworkReply *reply = manager->get(request); connect( manager, &QNetworkAccessManager::finished, this, &Manager::replyFinished ); connect( manager, &QNetworkAccessManager::sslErrors, this, &Manager::replyFinished ); You are calling the manager->get(request) before you have connected the signals/slots on manager, which may/will be too late. He is asking you to change over anything like that to connect( manager, &QNetworkAccessManager::finished, this, &Manager::replyFinished ); connect( manager, &QNetworkAccessManager::sslErrors, this, &Manager::replyFinished ); QNetworkReply *reply = manager->get(request); so you move the connection statements to before the get(request). So we get to see finished or quite possibly errors from the request. In general, you need to set up signals/slots as soon as you create an object (manager here), before you call anything which could raise a signal.

@Bill52 said in QCombo selected item background colour: QCombo selected item background colour: This question seems to have been asked before on the web. What about using stylesheet (instead of all that code)? https://stackoverflow.com/a/47021133 claims to be Qt 5.7+, or you can try the others? No, I don't have Windows Qt.

@Pl45m4 That was a spammer.

@EmilieG said in QSGGeometry how to draw disk points and not squared ones: QSGGeometry Can you draw a point on the end of the line? https://doc.qt.io/qt-5/qsggeometry.html#DrawingMode-enum I don't have a setup to test this at the moment. Edit: Also, I don't know if a point will be smooth.

To answer my own topic.... From a reply gained via the PyQt mailing list (pyqt@riverbankcomputing.com), it appears the only way to keep memory consumption down is indeed to delete as one goes along. deletelater() does no good for that if one is not hitting the top-level event loop, which can often be the case. From PyQt this must be achieved via sip.delete(widget). This sip.delete() is apparently effectively the equivalent of C++ delete (which, as I said, in itself does not exist in Python). May be of use to any PyQt-ers who need the equivalent. Armed with this, I can create 1000s of these dialogs with QWebEngineViews, and observe them being deleted and the number of QtWebEngineProcs sticking at 2 as I go along, with the memory being released back to the OS so that it all works OK.