General and Desktop

If you are using a QToolButton directly it has an option to turn on a dropdown menu: https://doc.qt.io/qt-6/qtoolbutton.html#ToolButtonPopupMode-enum

@belette19 said in Ethernet communication to solar converter, IP PTZ camera, HPGL plotter: ethernet communication So, you mean TCP/IP or UDP? For that take a look at https://doc.qt.io/qt-6/qtnetwork-index.html How exactly to communicate with that device (protocol) is out of scope of Qt, check the documentation of these devices.

@jspanchu No the code @raven-worx shows, is correct.

@Christian-Ehrlicher Ah! That's what I needed. Thanks!!

@Andrew23 said in Error 2 when use QFileDialog::getOpenFileName: QDir::homePath return true It's not a boolean. We want to know what your call to QDir::homePath() returns, to make sure it's not empty. And assuming it's not empty, can you confirm that the directory exists? It looks to me as though a Windows registry value cannot be found. Windows system call RegGetValueW() (https://learn.microsoft.com/en-us/windows/win32/api/winreg/nf-winreg-reggetvaluew) returns If the lpValue registry value does not exist, the function returns ERROR_FILE_NOT_FOUND. and it would not surprise me if it returns same if lpSubKey cannot be found too. Don't worry too much about the use of the word "file" here, it does not really mean an actual file. Why it is happening, and whether it is intended or matters, I do not know.

@mpergand The SIGNAL - SLOT syntax will never die, as long as it's being taught to new Qt users 😅🤣

@Desperado17 correct. You have to compile Qt accordingly.

@Joe-von-Habsburg You should really learn C++. See what @SimonSchroeder wrote...

@YoungCaveMan , can you tell, how build and use gsl in qt, step by step?

@JonB Thank you for your time ! I tried using the alternative solutions you mentioned, but none of them is giving the desired results. I guess I will stick to using a QSpacerItem.

Adding ./imageformats with the related DLL's in the application directory was indeed the missing step for me. While having everything within the EXE would be ideal, this approach is at least manageable given an open source project with maybe a couple hundred users worldwide. Thanks to @ChrisW67 and @SGaist for your replies.

@SGaist I think @rock37 planned to create something like an IObject Design Pattern with an "Application" Interface. I'm not sure if this will ever work in an environment like this and if this doesn't break Qt Event system. Even with app.exec() I don't think it will work. But you still have QApplication::instance() to do something more "fancy"

You would need to escape literal double-quotes if they are also present within the regular expressions. Using a JSON package/library, like QJSonDocument, to write the file is the easiest way to ensure that escaping happens where it should (and is reversed on read). Another observation: your email address regex is not allowing for a lot of options. This, for example, is a valid email address, "someone+something@example.com". See this Stackoverflow article for more.

@memyselfandqt said in mysterious warning: I know I must modify this file in design. So, I never edit this ui file. But you seem to have deleted something (maybe not intentionally) See https://forum.qt.io/post/566146

I got it going. Answer is here https://stackoverflow.com/questions/78017906/need-xpath-2-0-c-for-mingw/78028760#78028760

@apaczenko1993 Sorry. Qt 5.15.2 seems not having pdf module as default in the installer. I am using 5.15.3 on Ubuntu 22.04 and pdf module can be installed. Qt 6.6.2 has it as default.

@a_coder As both other responders said, you need a vertical spacer above a widget if you want to push it down.