General and Desktop

I am working with a application that has 12 curves and I am have the same problem, if I increase the number of curves, the performance decrease. I use qcustomplot. I need to plot 300pixels/second. Does anyone have some ideas?

Hi It compiles for me. Try to do a build -> clean and rebuild all.

@Kris-Revi "Studio Lights" and "Studio lights"? It is case sensitive.

Thanks very much for the reply of @Gojir4 and @JonB . It's very useful to me. The above is my solution, which may not be the best way, but it can solve the problems I currently encounter. I hope it can help friends who encounter similar problems. Best regards!

@SGaist Sorry forgot to mention that. Qt - 5.15.1 on Windows 10 (using MSVC 2019).

Is there any way of doing this? I saw that input to be right-justified has a range: //$X.XX e.g. $5.00 //$XX.XX e.g. $50.00 //$XX.XX e.g. $500.00 //$XX.XX e.g. $4999.00 (Max) If my QString value1 contains the above strings, I count the characters e.g. 5 6 7 8 (Max) Then I take the value 2 let us say $2.36 which will always be 5 chars and do: value2 = value2.rightJustified(lengthOfValue1String,QLatin1Char(' '), true); The problem obviously is non-monospaced Arial font. But I noticed that if I do QLatin1Char('$') instead of space, both values are aligned as per the images in my original post. But with $ instead of space which I don't want. Is there a way of using the fillChar with $ and then make them invisible? : )

[image: 794c7ec5-b8b7-496c-93fa-36b6133f0bf8.png] thank you for your advice. I find my headers now!

What do you mean by does not work ? Is it not called ?

That question is being answered on this thread.

Hi, AFAIK, you will need to use a PPA that provides them. Otherwise you can use Qt's online installer.

@Christian-Ehrlicher Debugger was not even necessary because the problem was just student's inexperience: i just needed to find QSqlQuery::at() in documentation and replace this piece of stupidity: QString DataProcessor::getValue(QString tableName, int recordNum, int colNum) { QSqlQuery query = selectAll(tableName); QStringList colTypes = getColTypes(tableName); QString value = ""; int i = 0; while( i <= 0) { if (query.next() == recordNum) { value = query.value(colNum).toString(); i++; } } return value; } by this: QString DataProcessor::getValue(QString tableName, int recordNum, int colNum) { QSqlQuery query = selectAll(tableName); QStringList colTypes = getColTypes(tableName); QString value = ""; while(query.next()) { if (query.at() == recordNum) { value = query.value(colNum).toString(); } } return value; }

I finally solved this. It's actually kind stupid: name cannnot be used as Q_PROPERTY name. After I change the property name, it works.

@donquibeats said in Passing control+keypress instructions from one form to another: works immediately. great, so don't forget to mark your post as solved then!

@TomNow99 But there isn't, for the same reason. QDataStream operator << needs to know the type at compile time, just the same question as before. Because we are C++ and that is a strongly typed language. Unless you're willing to stream it as a QVariant, which is not what you want. At the end of the day you can write a method just like you've shown just with the necessary ifs/switch for all the QVariant types you want to handle, which might be a dozen? Once you've written the method once, it's done.