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• Announcements

  Everything more or less news-worthy will show up in this forum at some point.
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  Hello Amanda, and welcome!

  I too would like to avert a climate/ecological breakdown. I've followed geosequestration experiments/pilots with interest but none seem to have achieved their goals yet, so I wish you the best in your project.

  As for the Qt Creator license issue, it looks like you installed a Commercial (possibly Evaluation) version of Qt? Do you remember which link you got it from?

  Anyway, please try uninstalling it, and then reinstall from https://www.qt.io/download-open-source instead. No funds are needed to use Qt under an open-source license, although non-monetary contributions to the Qt community (in the forum of bug reports, patches, community engagement etc.) are always welcome.

• The Lounge

  Chilling out? Want to discuss Abraham Lincoln? Well, in the Lounge you can discuss literally anything.
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  @Krpadia123 post some code to show how you did it.

• Jobs

  Are you looking for a job? Are you hiring? This is your place to post.
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  @Qt-Enthusiast
  I am interested

• Showcase

  Working on a cute app? Have some awesome widgets to share? Want to show off your blingalicious styles? This is your arena!
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  J

  Creating a QR code creator and scanner for desktop and WebAssembly (Wasm) involves using programming languages and libraries that support both environments. Below, I'll provide a basic example using HTML, JavaScript, and a popular library called jsQR for QR code scanning. For QR code creation, we can use the qrcode-generator library.

• Brainstorm

  Stuck? Some ideas just need to be dumped on someone before they can materialize.
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  @SGaist the call from QML to my model must include the temporary object, as it doesn't exist within the model (I suppose I could change this).

  The ideal flow on this would be:

  QML calls the model with the changed (temporary) object the model invokes a method in the subclass to populate a QJsonObject the model forms an outgoing message from the QJsonObject

  but none of this will work if the model doesn't know what subclass it is receiving, and currently I haven't been able to find a way to do this.

• Qt 6

  This is where all Qt 6 related questions belong

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  @taekahn As for today, I'm trying to build Qt6-6.6.1 with CLANG-18.0.0git, however, I got the following error messages:

  [ 34%] Built target HttpServer In file included from /opt/qt/qt-everywhere-src-6.6.1/qtgrpc/src/grpc/qgrpcchannel.cpp:17: /usr/include/grpcpp/impl/codegen/client_unary_call.h:56:15: error: use of undeclared identifier 'CallOpSendInitialMetadata' 56 | CallOpSet<CallOpSendInitialMetadata, CallOpSendMessage, | ^ /usr/include/grpcpp/impl/codegen/client_unary_call.h:57:74: error: expected unqualified-id 57 | CallOpRecvInitialMetadata, CallOpRecvMessage<OutputMessage>, | ^ /usr/include/grpcpp/impl/codegen/client_unary_call.h:60:15: error: use of undeclared identifier 'ops' 60 | status_ = ops.SendMessagePtr(&request); | ^ /usr/include/grpcpp/impl/codegen/client_unary_call.h:64:5: error: use of undeclared identifier 'ops' 64 | ops.SendInitialMetadata(&context->send_initial_metadata_, | ^ /usr/include/grpcpp/impl/codegen/client_unary_call.h:64:37: error: member access into incomplete type 'grpc_impl::ClientContext' 64 | ops.SendInitialMetadata(&context->send_initial_metadata_, | ^ /usr/include/grpcpp/impl/codegen/channel_interface.h:28:7: note: forward declaration of 'grpc_impl::ClientContext' 28 | class ClientContext; | ^ In file included from /opt/qt/qt-everywhere-src-6.6.1/qtgrpc/src/grpc/qgrpcchannel.cpp:17: /usr/include/grpcpp/impl/codegen/client_unary_call.h:65:36: error: member access into incomplete type 'grpc_impl::ClientContext' 65 | context->initial_metadata_flags()); | ^ /usr/include/grpcpp/impl/codegen/channel_interface.h:28:7: note: forward declaration of 'grpc_impl::ClientContext' 28 | class ClientContext; | ^ In file included from /opt/qt/qt-everywhere-src-6.6.1/qtgrpc/src/grpc/qgrpcchannel.cpp:17: /usr/include/grpcpp/impl/codegen/client_unary_call.h:66:5: error: use of undeclared identifier 'ops' 66 | ops.RecvInitialMetadata(context); | ^ /usr/include/grpcpp/impl/codegen/client_unary_call.h:67:5: error: use of undeclared identifier 'ops' 67 | ops.RecvMessage(result); | ^ /usr/include/grpcpp/impl/codegen/client_unary_call.h:68:5: error: use of undeclared identifier 'ops' 68 | ops.AllowNoMessage(); | ^ /usr/include/grpcpp/impl/codegen/client_unary_call.h:69:5: error: use of undeclared identifier 'ops' 69 | ops.ClientSendClose(); | ^ make[2]: Leaving directory '/opt/qt/qt-everywhere-src-6.6.1/build' /usr/include/grpcpp/impl/codegen/client_unary_call.h:70:5: error: use of undeclared identifier 'ops' 70 | ops.ClientRecvStatus(context, &status_); | ^ make -f qtopcua/src/opcua/CMakeFiles/OpcUa.dir/build.make qtopcua/src/opcua/CMakeFiles/OpcUa.dir/build /usr/include/grpcpp/impl/codegen/client_unary_call.h:71:22: error: use of undeclared identifier 'ops' 71 | call.PerformOps(&ops); | ^ /usr/include/grpcpp/impl/codegen/client_unary_call.h:72:15: error: use of undeclared identifier 'ops' 72 | cq.Pluck(&ops); | ^ /usr/include/grpcpp/impl/codegen/client_unary_call.h:80:10: error: use of undeclared identifier 'ops' 80 | if (!ops.got_message && status_.ok()) { | ^ make[2]: Entering directory '/opt/qt/qt-everywhere-src-6.6.1/build' make[2]: Nothing to be done for 'qtopcua/src/opcua/CMakeFiles/OpcUa.dir/build'. make[2]: Leaving directory '/opt/qt/qt-everywhere-src-6.6.1/build' [ 35%] Built target OpcUa