General and Desktop

@Swati777999 Layout haven't font setting but Any kind of Widget can be set font in Qt. For example I have QLabel type Widget QFont customFont; customFont.setItalic(true); customFont.setBold(true); customFont.setFamily("Arial Black"); customFont.setPointSize(20); QLabel *label = new QLabel("my Label"); label->setFont(customFont); for details font Or use set Stylesheet of that widget

@jsulm Thank you for the clarifications!. I understand why current code works how it works. But sorry, I'm still don't understand why it is ok to process any application event after exit() call :) What if I have 2 events in list: first is user click on close application (exit() called while processing) and 2nd is message that starts long calculation process in background? I shouldn't process 2nd and this information is obvious to qt since exit flag is raised to moment when it will start processing 2nd event. Why I'm pushed to spawn redundant checks in user code instead of just do the work right in qt framework?

@Pl45m4 said in Confusion between the usage of 'this' and 'parent': @JKSH sry :) Missed the sentence in your reply where you also said that No prob! It's good to have multiple confirm the same thing

The usual way is to modify the copy and then reapply it.

Hi, Then you need to use the SDK provided with pylon. There's everything there to enumerate the cameras connected to your system as well as grab images from them.

change your window size setGeometry(0, 0, 950, 550); When I run your code, I can not stop it. It uses full screen of my terminal. I have to restart machine. I do not see your problem on Ubuntu 18 with Qt 5.15.2.

@DanAm said in Sending and receiving data from/to PC/Arduino through serial port using QT: One general question : to send through serial port, do we need to stream the byte array (QByteArray type) using QDataStream or we can write the array in the port directly ? Either, you do not have to use QDataStream.

@timob256 Cross-referenced from your other thread at https://forum.qt.io/topic/132655/how-to-embed-ogre3d-in-qt5-as-a-widget. A QWindow is not derived from a QWidget, so, no, you cannot put a QLayout on it. Docs say: The QWindow class represents a window in the underlying windowing system. So you do not set extra buttons or charts or whatever on a QWindow. You may know better than I, and I don't know how it relates to your "Ogre" situation, but you may want to read through What is the difference between a QWindow and QWidget and maybe Introducing QWidget::createWindowContainer() too. Qt: layouts with a Qwidget window container talks about layouts too.

From https://wiki.qt.io/WIP-How_to_create_a_simple_chat_application: The first thing to remember is that when we receive the readyRead we can't make any assumption on how much data is available, the signal only tells us some data is there hence there are 4 cases we need to handle: The socket did not receive enough data to be a complete message, we only received a partial There is exactly enough data in the socket buffer to read a message There is more than enough data in the socket buffer to read a message but not enough to read 2 messages There is enough data in the socket buffer to read multiple messages

@ivanicy said in Qt application managed from web browser: Is it possible to do it or something like that?? Yes: https://doc.qt.io/qt-6/wasm.html Not the real question is "should you"? I the web inerface is all your app has then the answer is no. If your app is mainly compiled (desktop/mobile) but want to have a plan-B access through the web to it without having to rewrite it from scratch then this is the way to go

@JonB Yeap, thank you very much I will try it

@timob256 said in How to embed Ogre3d in qt5 as a widget: QWindows not unit setLayout ? install in element, not posible. Don't know what this means. this->setLayout(gl_layaout[3]); // this not work !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Don't know what this means. All your widgets are created with parent as their parent, instead of this. Since I wrote earlier But why are you using parent here? Shouldn't it be this? do you not think this applies to your case? Why? You are creating your widgets with a parent of parent of QTOgreWindow, and then this->setLayout(gl_layaout[3]); setting the layout on this. I don't get what you are trying to do or why. UPDATE I see you have now taken this question to https://forum.qt.io/topic/132674/how-do-i-put-a-qlayout-in-a-qwindow. It's always helpful to others if you cross-reference posts like this. I see now that my "But why are you using parent here? Shouldn't it be this?" is not applicable to QWindow. I will post into your other thread.

@Wasee @jsulm's code is correct. However, there will be a "wrinkle" if your someParameter argument has any spaces in it. I don't want to complicate things unnecessarily, so if that is the case let us know, otherwise just follow that code.

If you are using a password manager or drive encryption the secret (i.e. the actual key) is protected by a password, i.e. the password is used for encryption of other passwords or keys. This also means that you need to type in the password to decrypt the data. Without user interaction this approach will not be able to access any secured data. All other software I know of stores passwords or keys directly; either as plain text or maybe obfuscated (like @artwaw suggested). There is no other protection. This means that everyone who can access the data has access to passwords or keys. Like I said already, SSH keys are store plain in the users folder. What is the protection here? The simplest way to protect this data is access privileges. By default the user's home directory is only accessible by the user (and also root or any super user can easily gain access). This is safe as long as no one rips out your hard drive and puts it into their computer where they control who has access to which files. The only way to prevent that is file system encryption. File system encryption means that you have to enter the password every time you mount the filesystem (usually at startup). Still, root and any super user can get access to this data. If you think of your key more like a regular password, you should read up on password hashing. Use a random salt to hash the password and then store the salt and the hash. When the user enters the password again, combine it with the stored salt and hash it again. If the hash matches the user entered the correct password. However, this approach always required interaction from a person. If you want to decrypt autonomously you have to store the key plainly (or obfuscated) somewhere. Your best bet is to use system api secure storage like @artwaw suggested. Also: Using the MAC for encryption is also just obfuscation as this is a well known "secret" anybody can figure out. Finally: Security through obscurity is no real security at all.

@WesLow said in Find Data Value with Mouse on a QtChart: Confused about the last parameter Last parameter is the pointer to slot: connect(seriesName, &QXYSeries::hovered, yourClassInstancePointer, &YourClassName::displayPlotValueFunction);

@mpergand That's good to know, I'll stick with using dynamic properties after all. Thinking I would have to add these manually to each widget I want? Couldn't be as easy as setting a dynamic property for say a class and use that and have it show up in Qt Designer.

@SGaist You are, as usual, right and I am the absolute moron :D I forgot to take into the account starting point of the cell in paint... Too much time has passed since I had to write the delegate it seems. The solution of the problem was correcting the drawPixamp starting point (add opt.rec.x() and opt.rect.y() respectively): painter-drawPixmap(QPoint(opt.rect.x()+opt.rect.width()/2,opt.rect.y()+opt.rect.height()/3),px.scaled(opt.rect.width(),opt.rect.height()/2,Qt::KeepAspectRatio,Qt::SmoothTransformation)); Thank you for this quick reminder! Cheers, A.

Hi, Are you using layouts to build your UI ?