3rd Party Software

@Ganesh-Kadam QProcess Class

Hi and welcome to devnet, In what way is it related to Qt ?

@jsulm Thanks for the solution.

Use Detours Library to hook SetUnhandledExceptionFilter

So for some reason when I take out this from within the constructor of Mainwindow.cpp try { // Create an instance. mongocxx::instance inst{}; // Connection string const auto uri = mongocxx::uri{uriString}; // Setup the connection and get a handle on the database. mongocxx::client conn{uri}; mongocxx::database db = conn["TestDB"]; // Grabbing the collection col = db["TestCol"]; test(); } catch(const std::exception& e) { // Handle errors. std::cout<< "Exception: " << e.what() << std::endl; } then move it to the MainWindow.h header file, like this private: std::string uriString = "<uriConnectionString>"; const mongocxx::uri uri = mongocxx::uri{uriString}; mongocxx::instance inst{}; mongocxx::client conn{uri}; mongocxx::database db = conn["TestDB"]; mongocxx::collection col = db["TestCol"]; it works...not sure why, so if someone who has more experience than myself has any input, please let me know I would love to see an explanation or thought process behind it. Otherwise this is what worked for me, hope it can help someone if they are stuck as well.

@SGaist Awesome. Thank you a lot, appreciate the help. I will definitely be looking into this, and if I have any other questions I'll reach out, cheers!

@JonB you are correct, maybe its in a different thread very strange everything hard to tell from afar

@SGaist Thank you, that solved it. After extracting the files, I edited qwt.pro, and commented out the lines that run the tests: ################################################################ # Qwt Widget Library # Copyright (C) 1997 Josef Wilgen # Copyright (C) 2002 Uwe Rathmann # # This library is free software; you can redistribute it and/or # modify it under the terms of the Qwt License, Version 1.0 ################################################################ lessThan(QT_MAJOR_VERSION, 5) { lessThan(QT_MINOR_VERSION, 8) { error(Qt >= 4.8 required.) } } include( qwtconfig.pri ) TEMPLATE = subdirs CONFIG += ordered SUBDIRS = \ src \ classincludes \ doc contains(QWT_CONFIG, QwtDesigner ) { SUBDIRS += designer } contains(QWT_CONFIG, QwtExamples ) { SUBDIRS += examples } contains(QWT_CONFIG, QwtPlayground ) { SUBDIRS += playground } #contains(QWT_CONFIG, QwtTests ) { # SUBDIRS += tests #} qwtspec.files = qwtconfig.pri qwtfunctions.pri qwt.prf qwtspec.path = $${QWT_INSTALL_FEATURES} INSTALLS += qwtspec After that the below steps run without problems: qmake qwt.pro mingw32-make -j 6 mingw32-make install

@JonB Well not against offering you a beer, or two...(or more :-)) @JonB said in undefined reference - Help first time external header library QT C++ [Linux]: At this point have you considered dropping this third-party Borland stuff completely and using Qt's QTcpSocket to do whatever you want from TCP instead? But I'm not offering to change your own source code over from using Borland TCP to Qt's ;-) This APi is used for GPIO manipulation from an ethernet GPIO modules : [image: b6f5b0bd-e4f1-4708-a16a-d49f89d9dbe8.png] What you say seems really true, cause the documentation about the use with Visual studio c++ do not refer at any moment about any library, only cpp/h files. I will try to use this documentation and use into my *.pro file only the files used into Visual Studio. https://www.deditec.de/media/pdf/manual_e_delib.pdf#page=26&zoom=auto,-329,815 I will made you a feedback of course

@SGaist said in OpenCV select camera ID to connect: That's rather something you should check with the OpenCV folks. As for fixing the order of the cameras, maybe you can do something with udev or equivalent on Linux. Thanks for your reply, I am using windows, and still want to wait for someone who can help,

@jsulm While I was looking for piece of code to post, I actually found the problem in it. In some place, the connection wasn't passed to a query and it was associated with a "default" connection. @jsulm, thank you for the help!

@JonB Thank you, Sir.. You are correct. There's a mismatch between the versions. Now, I have sort out the error.

@cjacquel2021 Suggest you search this forum, or the web, for send mail or send email for various suggestions. https://forum.qt.io/topic/102082/is-there-anyway-to-send-email-to-someone-in-qt/2 mist be a start.

@sneha-ashok said in libQtcore so.5: The libraries files of qt is not been picked by my Yocto setup only the libQTcore so.5 libraries is not been. Please review this sentence. We realise English may not be your first language, but it does not make sense as it is. If the error message really reads libQTcore so.5 (did you copy & paste it or just type it in?) then that is incorrectly spelt somewhere you have asked for it.

@Imeshsps Turns out you have to add -DQT_FEATURE_alsa=ON to make experimental feature ON.