General and Desktop

@cancech You might reset the current index flag during painting by overriding https://doc.qt.io/qt-6/qabstractitemview.html#initViewItemOption

@Neether said in same filename cause multiple definition: This feature is unbelievable in 2024 This has nothing to do with a 'feature' or similar. It's just a problem of duplicate symbols in your code - this is simply not allowed (even not in other programming languages).

@Pl45m4 said in Colour and appearance of QComboBox: cboMatrix.at(14).at(i)->setStyleSheet("") Thank you @Pl45m4 'cboMatrix.at(14).at(i)->setStyleSheet("");' causes the application to crash, but 'cboMatrix.at(14).at(i)->setStyleSheet("space ");' works as I expect. Your suggestion solves my problem perfectly :-)

@TheCrowKaka Don't know if I understand correctly, but you have a C Library and the examples how to use it only use Python code, whereas you want to use it in your Qt C++ app? m_DEV_IO.init = VOIDFUNCTYPE(m_UART_dev_io.UART_init) m_DEV_IO.open = UINTFUNCTYPE(m_UART_dev_io.UART_open) m_DEV_IO.close = VOIDFUNCTYPE(m_UART_dev_io.UART_close) m_DEV_IO.read = RWFUNCTYPE(m_UART_dev_io.UART_read) m_DEV_IO.write = RWFUNCTYPE(m_UART_dev_io.UART_write) m_UART_dev_io.COM_PORT = args.option[1] Since this is most likely the related to the Python wrapper, you don't need that at all... Wild guess: Can't you just simply do something like DEV_IO.init()? What's the reason to use this C Library? I mean, you have your own C++ class and you use QSerialPort in it...

@AnneRanch I agree with you completely. Your post, in my not so humble opinion, is not a rant. It is a valid request. Thanks for your comment.

@ChrisW67 said in "debug assertion failed" error message: What warnings did your compiler issue when it compiled this? I am surprised that mine did not. I realized that the previous error went out because it entered the method that contains this, if I don't run the method with the array the application is fine and can run, actually there is a lot of code in that method but all of it only relates to the UI -> this is the only one I suspect, because when I delete the array the error moves to ui->label->settext(" ");, I will try your method.

@JackMyson You don't actually show the message box being shown (exec()?). Nothing special here. Try not subclassing the QMessageBox and using that directly, so you can rule that out. Try a standalone application without anything of your own. Try passing nullptr as parent to the constructor, any difference? Are you sure you are not using Wayland rather than Xorg, that might make its position or behaviour different.

@shreya_agrawal This is how I got rid of the gradient: background-color: qlineargradient(x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 your_color, stop: 1 your_color);

@ChrisW67 Where would you find that I can only find qt version 5.9.7 in the configuration.

@Paul-Colby Thanks for your reply again. It would be interesting to try your code on Linux or macOS for comparison (they will also cache in lots of ways, but differently, so might be interesting). I only tried the code on Linux for comparison (I don't have a macOS platform) and found that it didn't cache the service list. The application could find the OTA DATA characteristic after performing steps 1-3. 1.explicitly disconnecting the device - immediately after writing your characteristic, and/or immediately after receiving the disconnect signal (I'd try all combinations of either/both); I tried all combinations on Windows 11, but none of them worked. 2.explicitly try to re-discover services after the initial discovery fails to find the new characteristic (the first discovery would register the WinRT BLE device with Qt, the second would close it before re-discovering). I tried re-discover services and characteristics through two buttons, but none of them worked. The function QLowEnergyController::discoverServices() does nothing since it has been called immediately in the slot triggered by the QLowEnergyController::connected() signal. According to Qt help project, the best workaround is to temporarily turn Bluetooth off. So is it possible to turn Bluetooth off by code? [image: bea2e7d2-6034-4a6c-96f0-41610a7f7e99.png] [image: 1cf1ba81-1e8c-4d95-a59c-dacb57060fd2.png] Anyway, it seems that the WinRT implementation does "clear the previous services cache" when (re)discovering services. However, it does this by iterating the currently known services, and closing them one by one. Please see BluetoothLE example of Windows-universal-samples and the following codes (found at Windows Kits\10\Include\10.0.22621.0\cppwinrt\winrt): template <typename D> WINRT_IMPL_AUTO(winrt::Windows::Foundation::IAsyncOperation<winrt::Windows::Devices::Bluetooth::GenericAttributeProfile::GattDeviceServicesResult>) consume_Windows_Devices_Bluetooth_IBluetoothLEDevice3<D>::GetGattServicesAsync(winrt::Windows::Devices::Bluetooth::BluetoothCacheMode const& cacheMode) const { void* operation{}; check_hresult(WINRT_IMPL_SHIM(winrt::Windows::Devices::Bluetooth::IBluetoothLEDevice3)->GetGattServicesWithCacheModeAsync(static_cast<int32_t>(cacheMode), &operation)); return winrt::Windows::Foundation::IAsyncOperation<winrt::Windows::Devices::Bluetooth::GenericAttributeProfile::GattDeviceServicesResult>{ operation, take_ownership_from_abi }; } In QLowEnergyControllerPrivateWinRT: : discoverServices(), I think it should use GetGattServicesWithCacheModeAsync rather than GetGattServicesAsync. In obtainCharList, I think it should use GetCharacteristicsWithCacheModeAsync rather than GetCharacteristicsAsync. I have tried to modified the source codes (see the following pictures) and found it was worked. Now the application could find the OTA DATA characteristic after performing steps 1-3, but the speed of finding services and characteristics slowed down significantly. [image: 134def9c-4600-4ac0-aca1-1aa34b2d2abc.png] [image: f7b650fc-cdd5-4004-99dd-60547c66558c.png] [image: 3c2d326d-d31c-4fce-b4ae-aa83b4a76861.png]

@Redman The problem is that after reset you have two different shared pointers pointing to same data. As soon as tmp is deleted (on next loop iteration) it deletes the data it points to. Instead of reset use swap(...).

@Paul-Colby Thank you so much for such a detailed solution! I think I would go with option 3 in my case.

@koahnig Try using skip_ssl in my.ini file located in MySQL installer path. This worked out for me. [mysqld] skip_ssl

@SGaist I was finally able to resolve the issue by using skip_ssl in my.ini file.

@darthana There is also https://doc.qt.io/qt-6/animation-overview.html, but not sure you can use it to animate drag and drop.

@Pl45m4 - I didn't know about that function-pointer method; much better to catch errors at compile time!

@kshegunov Thanks for reply. Yes, I am looking for something "static". I basically build a task / sub-project and then I like to incorporate it into the main project. Knowing the overall "tree" of objects would help , mainly with implementing "connect" between objects. This "gamma" tool is interesting, however, my application will not require such dynamic management after I get the "skeleton structure " build.