@JonB said in converting from float or double to QString results in output being 0: Warning: The QString content may only contain valid numerical characters which includes the plus/minus sign, the character e used in scientific notation, and the decimal point. Including the unit or additional characters leads to a conversion error. In which case RTFM is the rule of the day! but I'm lazy.

@jsulm the data that is sent is in the form of a char array, example, char message[] = "message here"; I use QString because before I was using std::string and I was getting errors when trying to submit that to the line edit, I think conversion type errors, using a QString removed that error and thus I just stuck with it. edit: oh it is working now, I feel like we didnt change anything though and we were just going through debug statements

@Dean21 Please show your current code if something does not work...

@Dean21 @JoeCFD asked where the mqtt libs you built are stored, not where the code is...

@SGaist Great Thank you this, I know that qt has its own MQTT module just I had already developed my code for MQTT using the mosquitto library before I knew I was going to be making a GUI using QT.

@JoeCFD said in QVariant to QList: Understand. Thiink about you can never be number 1 anymore if you play chess. Oddly enough, that was never a concern of mine.

Then the links I posted is what you should read and use.

At the end I've researched again the view's transformations and concluded to support both features and warn for the complexity. I did not re-implement the add/remove items of the scene together with a group. Thanks for the hint @Asperamanca .

@harveyab said in Show build kit at runtime: use it for conditional compilation If you want to use it for this you will need to know at compile-time, not at runtime. Assuming (I don't know but would guess) that you cannot access the particular kit selected in Creator I would expect to have to test for compile-time defines which come from the kit chosen, e.g. compiler version like _MSC_VER.

@Uchi Correct! At the time the connect() statement is issued both the signal & slot objects must be set to the instances to be connected, that's what connect() does. Changing either of the objects later to an instance has no effect on the earlier connect().

@Gianluca-Bernardi I have default as well. Not sure how you got full before. Good to know you solved the issue.

No sort problem but a basic c(++) problem - you pass the parameters to unzip() by value instead by reference so how should the those variables be updated outside?

There are examples and detailed descriptions on both pages I linked.

Hi, As @JonB already explained you need to properly encapsulate the various aspects of your logic. One class to handle the communication with the camera. That class shall not care at all about the UI. That's not its job. It should provide feedback through signals. What is connect to it, again, not its problem. The job of your UI is to give the user the option to load a file and configure stuff. The UI will be responsible for reconfiguring whatever needs to be. As for the sequential command handling, load the file, parse it, send the first command and once your "communicator" class is done with it, make it emit a signal to signify that the task is done. In a slot connected to that signal, send the next command.

@MEsc said in How to stop an animation when a new one starts c++: It should first check if QLineEdit is empty and if not then stop the animation( So change the order - I mean you're the programmer who programmed it so first checking for the QLineEdit and then doing something other shouldn't be that hard to add.

@JonB My EDIT revision now prints the column heading I wanted. Hopefully I only need to run that header saveState function just before program exit, and restoreState just before displaying my table on the next run. If that does what I want, I won't need to directly deal with "visual indexes" at all at this stage in my ongoing "personal movie database" project. Once I can persistently re-sequence columns, I hope to add several more columns, with the less interesting ones dragged to the right of the row out of the way. I already remember user-revised column widths, so I can make those rightmost columns as narrow as possible, but I fully expect to progress to optionally hiding temporarily unwanted columns. Anyway, I'm getting older and slower, so it'll probably take me a few days just to implement "moved column memory" in my app. But eventually I want several members of a "cinema club" each having read/write access to their own database (on DropBox, GoogleDrive, whatever), and read-only access to the other members' databases (to retrieve "rating" and "date seen" values by user).

@JonB I changed it as you said and it works well!!!

@JonB @mrjj It's coming back to me. I once had the same problem with an IMU sensor that I could not solve under windows. But once under linux with the same code, I receive the data perfectly. Same thing, I just tested under linux for the GPS, I receive the data but not under Windows. To this day I don't know where the problem comes from

@RuWex What do you think how long does "time" object exist here: void SendCommands::StartToSendCommand( QString fileName)//Ruth { Timer time(2000, fileName); ? Or "timer" here: button->show(); connect(button, &QPushButton::clicked, this, [=]() { statusBar()->showMessage(tr("Ready Start Testing"), 2000); Timer timer(num, fileName); });

@RuWex Please look at the QTimer documentation, and the examples there. This does not work by "inserting a delay" into the code where it is called. Rather, it sets off a timer which keeps running, and you supply a "slot"/"callback" which will be invoked when the timer expires. It is in that function/lambda that you do whatever work you wish to perform each time the repeating or singleshot timer expires, e.g. in your case maybe it sends the next character.

@RuWex Iterate along the characters in the string till you find a digit; or QString::indexOf(QRegularExpression("m[0-9]")) probably does this. The last character before the digit is the index minus 1.

Any idea? I found that I could use Qt::CustomizeWindowHint to remove shaking if it was possible to recolor that white bar on top — but Windows 10 doesn't have that option.

@Turbotroop OK, so: Is the code pasted now currently what you have, exactly? What error do you currently have? Have you acted on the previous comments? For example: although it won't generate a compilation error, it does not make any sense to set up all these boxes or arrays in the main window destructor, does it? Why not in, say, the constructor instead?

@RuWex Sorry, I mean https://doc.qt.io/qt-6/qserialport.html

@Tasha said in error: no match for 'operator==' (operand types are 'Visitor' and 'const QString'): return (firstName == firstName); Do you think this line makes any sense? This line also does not make sense: if(std::find(visitorsList.begin(), visitorsList.end(), visitor->getFirstName()) You want to compare visitors, so you need a comparison function/method. You should implement this: bool operator==(const Visitor &otherVisitor);

@Tasha said in QDateTime to a file (Invalid operands to binary expression ('std::fstream' (aka 'basic_fstream<char>') and 'QDateTime'): << + " "; Sort this bit out in your statement.

@Chris-Kawa, oh, pardon my blindness, it really works. I found that the stylesheet is resetting the width of the button in my case.

@jsulm OoI, why did Qt6 QString feel the need to introduce sliced() when we have had mid() for years? EDIT Oh, mid() docs now say If you know that position and n cannot be out of bounds, use sliced() instead in new code, because it is faster.

@JonB You have (for unknown reason) placed a button at row #5 column #6 and spanning 5 rows and 2 columns. It's not going to make much sense, is perhaps not what you intend, and will move around when you place other widgets on the grid layout. I know nothing about "In the gray square there should have been a cube. that I opened", The second shot shows about what I expect when you didn't use any layout. If the 3 lines of text there were deliberate you would need to put them into the layout now if you expect to see them.

Hi, Not knowing the FreeBase API it's hard to answer. Do you have a link of it ? In any case, the worst case scenario would be to fetch the whole data, change the fields you want and then send again the whole data.

@Paul-Colby Yes, that what I was meaning. I'm gonna try thanks.

The size of the CheckBox is on controlled by the style/theme. See: https://doc.qt.io/qt-6/qtquickcontrols2-styles.html

Hi @JonB , Thank's for your reply . I just solved the problem. My goal was to put them in a text file

okay got it working , this will mark as solved thanks

Then please mark this topic as solved, thx.