QtWebEngine

@Rumeysa_135 said in Serial port connection: I just wanted to use QtWebEngine as header. I'm sorry I don't know what this means. And QtWebEngine is used in widgets anyway. Either your question/use of serial port is to do with QtWebEngine (not sure how, but it's your question) or it is not and has absolutely nothing to do with web engine?

I have finally found out what was the cause. In my PATH variable /usr/local/bin came before /usr/bin folder where Bison was pointing to version is 2.4, instead of /usr/bin's 2.7. Strangely QT didn't give any errors and Bison test has passed successfully with 2.4 version. After pointing to the newer 2.7 version everything worked fine.

Hmm... That is interesting.

@JKSH said in A problem that has been bothering me for 7 months: This was in your error log. To fix it, install the Qt Positioning module. Following this, I fix it! Thanks

We fear that much knowledge about how the Qt framework produces the graphics as well as much time will be required to determine the core of this issue. So we thought about workarounds to get rid of that, by meaning of doing something that causes a "refresh" of the window when the display resumes from standby. During our recherche, we found following (to be done in the QMainWindow instance): qApp->processEvents(); update(); Unfortunately that didn't work (what surprise...). hide(); show(); or resize(...); // Change width and/or height for 1px or so Both of them worked, where hiding/showing the window may result in that users may see what is behind the browser (for a very short moment, of course). However, both of them seem to be a very amateurish way to do this. Do you have any other ideas how to force the graphics to be refreshed? Have much thanks in before, Yours Willy K.

@J-Hilk said in Parsing a hexadecimal data and calculating checksum: I think the OP's question is: "How do I take only 4 Bytes from my QByteArray, so that I can convert it into an int32?" @jsulm nope, it just exists when the size doesn't match So if you want to access 4 bytes (sizeof(int32)) for conversion use QByteArray QByteArray::mid(qsizetype pos, qsizetype len = -1) const. Otherwise if you want it to appear as an array of int32 (and you know byte ordering is correct) use reinterpret_cast<> to int array on the data.

@Rumeysa_135 I gave you a link to a method to convert a hex string to an integer and @Emre-MUTLU gave you code to split a string into hex numbers. You should now be good to go and write what you need. If something is not clear then please ask concrete questions and provide more details.

A bug? https://bugreports.qt.io/browse/QTBUG-77450

I think it is Qt, becouse in resource_bundle.cc I find this: auto data_pack = std::make_unique<DataPack>(ui::SCALE_FACTOR_NONE); if (!locale_path.empty() && data_pack->LoadFromPath(locale_path)) { locale_resources_data_ = std::move(data_pack); } else { locale_resources_data_ = std::make_unique<DataPack>(ui::SCALE_FACTOR_NONE); } ```then (secondary_locale_resources_data_.get() && secondary_locale_resources_data_->GetStringPiece( static_cast<uint16_t>(resource_id), &data)) if false and thats why I get this error. My locale: LANG=en_US.UTF-8 LANGUAGE=en_US:en LC_CTYPE="en_US.UTF-8" LC_NUMERIC="en_US.UTF-8" LC_TIME="en_US.UTF-8" LC_COLLATE="en_US.UTF-8" LC_MONETARY="en_US.UTF-8" LC_MESSAGES="en_US.UTF-8" LC_PAPER="en_US.UTF-8" LC_NAME="en_US.UTF-8" LC_ADDRESS="en_US.UTF-8" LC_TELEPHONE="en_US.UTF-8" LC_MEASUREMENT="en_US.UTF-8" LC_IDENTIFICATION="en_US.UTF-8" LC_ALL= What is "DataPack" ?

Try using the exact, or absolute, path. The terms absolute and relative also have their usual English meaning. A relative path shows where something is relative to some start point; an absolute path is a location starting from the top. When you open a file with the name “filename.ext”; you are telling the open() function that your file is in the current working directory . This is called a relative path. file = open('filename.ext') //relative path In the above code, you are not giving the full path to a file to the open() function, just its name - a relative path. The error “FileNotFoundError: [Errno 2] No such file or directory” is telling you that there is no file of that name in the working directory. So, try using the exact, or absolute path. file = open(r'C:\path\to\your\filename.ext') //absolute path In the above code, all of the information needed to locate the file is contained in the path string - absolute path. It's a common misconception that relative paths are relative to the location of the python script, but this is untrue. Relative file paths are always relative to the current working directory, and the current working directory doesn't have to be the location of your python script. . In order to make this work, the directory containing the python executable must be in the PATH, a so-called environment variable that contains directories that are automatically used for searching executables when you enter a command. In any case, if your Python script file and your data input file are not in the same directory, you always have to specify either a relative path between them or you have to use an absolute path for one of them.

Alright i figured it out! I don't know why i didn't build QT in debug mode to begin with but just slipped my mind... Anyways i rebuild the whole thing in DEBUG mode and then i got a MUCH better error output: QEglFSVivIntegration will set environment variable FB_MULTI_BUFFER=2 to enable double buffering and vsync. If this is not desired, you can override this via: export QT_EGLFS_IMX6_NO_FB_MULTI_BUFFER=1 [636:649:0118/130831.434403:FATAL:udev_loader.cc(38)] Check failed: false. #0 0xffff99fb014c <unknown> #1 0xffff99db42dc <unknown> #2 0xffff99df2408 <unknown> #3 0xffff96652f24 <unknown> #4 0xffff9664f63c <unknown> #5 0xffff966511a4 <unknown> #6 0xffff968d80c8 <unknown> #7 0xffff968d9de0 <unknown> #8 0xffff968d9a4c <unknown> #9 0xffff968d93d4 <unknown> #10 0xffff968d8e48 <unknown> #11 0xffff9578e008 <unknown> #12 0xffff99db4bfc <unknown> #13 0xffff99e14b90 <unknown> #14 0xffff99e14cc8 <unknown> #15 0xffff99e14fa4 <unknown> #16 0xffff99fe3284 <unknown> #17 0xffff99e144c8 <unknown> #18 0xffff99e7afdc <unknown> #19 0xffff99f388cc <unknown> #20 0xffff98acbc1c <unknown> #21 0xffff98acb8a8 <unknown> #22 0xffff99f38ef8 <unknown> #23 0xffff99fd4920 <unknown> #24 0xffff92b632ac <unknown> #25 0xffff92bc7b9c <unknown> Received signal 6 #0 0xffff99fb014c <unknown> #1 0xffff99db42dc <unknown> #2 0xffff99faf1ec <unknown> #3 0xffffa3732604 ([vdso]+0x603) #4 0xffff92b64de0 <unknown> #5 0xffff92b2277c raise #6 0xffff92b0ff1c abort #7 0xffff99fae990 <unknown> #8 0xffff99fae9b8 <unknown> #9 0xffff99df2808 <unknown> #10 0xffff96652f24 <unknown> #11 0xffff9664f63c <unknown> #12 0xffff966511a4 <unknown> #13 0xffff968d80c8 <unknown> #14 0xffff968d9de0 <unknown> #15 0xffff968d9a4c <unknown> #16 0xffff968d93d4 <unknown> #17 0xffff968d8e48 <unknown> #18 0xffff9578e008 <unknown> #19 0xffff99db4bfc <unknown> #20 0xffff99e14b90 <unknown> #21 0xffff99e14cc8 <unknown> #22 0xffff99e14fa4 <unknown> #23 0xffff99fe3284 <unknown> #24 0xffff99e144c8 <unknown> #25 0xffff99e7afdc <unknown> #26 0xffff99f388cc <unknown> #27 0xffff98acbc1c <unknown> #28 0xffff98acb8a8 <unknown> #29 0xffff99f38ef8 <unknown> #30 0xffff99fd4920 <unknown> #31 0xffff92b632ac <unknown> #32 0xffff92bc7b9c <unknown> [end of stack trace] Calling _exit(1). Core file will not be generated. It seems Chromium is trying to use udev dynamically BUT i am running a busybox system with NO udev, so makes sense. There didn't seem to be any sort of configuration option in QT5 itself to disable chromium's udev that i could find BUT the version of chromium used had that option so i had to patch the QTWebEngine config file linux.pri: diff --git a/qtwebengine/src/core/config/linux.pri b/qtwebengine/src/core/config/linux.pri index eaecab3c9..e4392aa78 100644 --- a/qtwebengine/src/core/config/linux.pri +++ b/qtwebengine/src/core/config/linux.pri @@ -12,7 +12,7 @@ gn_args += \ use_gio=false \ use_gnome_keyring=false \ linux_use_bundled_binutils=false \ - use_udev=true \ + use_udev=false \ use_bundled_fontconfig=false \ use_sysroot=false \ enable_session_service=false \ I then rebuilt and it's now working wonderfully!!!! At least from my minimal testing haha, i have a website displaying from my app!

Hi and welcome to devnet, From the top of my head, I would rather animate the handle than the widget that is in the splitter.

@ArthurPYQT QGuiApplication.setAttribute(Qt.ApplicationAttribute.AA_UseSoftwareOpenGL) QCoreApplication.setAttribute(Qt.ApplicationAttribute.AA_UseSoftwareOpenGL) QApplication.setAttribute(Qt.ApplicationAttribute.AA_UseSoftwareOpenGL) after set these attributes above, everytime I start the program, the cmd line reads: ARB::createContext: wglCreateContextAttribsARB() failed (GL error code: 0x0) for format: QSurfaceFormat(version 2.0, options QFlags<QSurfaceFormat::FormatOption>(), depthBufferSize -1, redBufferSize -1, greenBufferSize -1, blueBufferSize -1, alphaBufferSize -1, stencilBufferSize -1, samples -1, swapBehavior QSurfaceFormat::DefaultSwapBehavior, swapInterval 1, colorSpace QSurfaceFormat::DefaultColorSpace, profile QSurfaceFormat::NoProfile), shared context: 0x2 (operation done.) GDI::createContext: wglCreateContext failed. (operation done.) Unable to create a GL Context. qt.qpa.backingstore: composeAndFlush: QOpenGLContext creation failed qt.qpa.backingstore: composeAndFlush: makeCurrent() failed