3rd Party Software

Hi,'

Which class would that be ?

@NewUser2023 Please post text not pictures.
In your LIBS you use PWD - make sure the path is really valid and check the linker call to see what paths are passed to the linker.

@jsulm I managed to zip/unzip with quazip for Android device. With guidance from @jsulm. Thank you.

https://forum.qt.io/topic/151699/how-to-unzip-an-application-running-on-an-android-device-using-qt

The fmt library also has a header-only mode. It is enabled by providing a define FMT_HEADER_ONLY. In this case you don't need to link to the fmt library anymore. The only requirement is then to have the path to the headers in your search path. (BTW, if everything is set up correctly, you most likely have to just write #include "fmt/format.h". The path up to this point should be set up differently.)

@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 :
787d599f-c9e0-4a81-b147-61a7492b4eee-image.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.