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Questions tagged [qstring]

A QString is a class in Qt library which implements character strings.

QString holds a unicode string inside, and provides a set of useful functions to manipulate the data, including easy concatenation, trimming, search and replace, and conversion functions.

QString can also be converted to std::string and vice-versa with toStdString() and fromStdString() respectfully:

QString str = QString::fromStdString( std::string("Hello, World!") );

std::string str = QString("Hello world!").toStdString();

The official Qt documentation can be found here for Qt 4.8 and here for Qt 5.

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Can't use QString in a QLineEdit nor QComboBox as a parameter

I'm trying to make a function that replace the text inside a QLineEdit when the user want to revert is name to default using a QPushButton. This is where the code is getting "saved". `//Must get information in the DB lineditPlayerName = new…
Chax
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QVariant is not able to distinguish between QDateTime and QString

I have a QDateTime object which I store in a QVariant and then I check the QVariant with type() but it behaves strangely when I check the type. void MainWindow::Test() { QDateTime myDate; // QDateTime; …
anbu selvan
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Passing word count into dialog qt

I am building a notepad and want to count the words in a dialog. QString input = ui->textEdit->toPlainText(); int spaces = input.count(" "); ui->NumWordsLabel->setNum(spaces); This is my attempt so far. However, I want to execute this code in my…
sark9012
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Turn QString to JSON

I have the following: QString notebookid = ui->notebookid->toPlainText(); QString tagid = ui->tagid->toPlainText(); QString userid = ui->userid->toPlainText(); QString subject = ui->subject->toPlainText(); QString comment =…
sark9012
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qstring to short format for qlineedit

I tried this code but still have problem for QString to short value for example it work well for text = 20 but it return 0 for value = 20.5. but I need value=20. how can I solve it? inline __int16 GetStaticToInteger(QLineEdit* lineEdit) { …
citi
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QString to short using toShort

I want to convert QString to short.when I try this code ui->lineEdit->text().toShort(); It works well for text = 20 but it returns "0" for value = 20.5. but I need value = 20. how can I solve it?
citi
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Why have QString in struct sometimes a bad-ptr?

I've got an complicated error. The software send PrintParamters to a Printer a couple of times. At a certain moment all QStrings of the Parameter Struct are broken (bad ptr) Is there an general issue with QStrings in Structs? here is the struct I'm…
Christoferw
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define function with #define in cpp?

i want check sth in if multiple time, i use #define for this ad i want to use it but it doesn't work #define CHECK_CONDITION(QString condition, start, curr) if(condition == "" ) return true; return (table.commonIn() == "team_id"?…
mari
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Qt - Split and use string from lineEdit as regExp

I want to filter all my data by typing a string, sounds simple. This is what I got so far: stringToSearch.replace( QRegExp(" "), "|" ); QRegExp regExp(stringToSearch,Qt::CaseInsensitive, QRegExp::Wildcard);…
Jedi Schmedi
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Converting from cryptopp::integer to QString

How to convert from cryptopp::integer to QString? If it's important I work on Mac OS. I absolutely don't know what to do, only trying to use QCA, but it wasn't good enough!
user1700480
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cannot convert from int & missing default parameter for parameter 1

I am developing new project in Qt with existing MFC project . SO in MFC I have a function which uses SYSTEMTime and return CString. example CString getTimestampString( void ) { SYSTEMTIME systemTime; CString datestr; …
samprat
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Error: no operand "<<" matches these operands when try to use Qstring with OStream object

Qt version 5.01 Platform windows 64 bit Issues:error: no operand "<<" matches these operands I have looked into the web but could not able to find solution for it. I have tried lots of things but it doesnt work. If I change QString to…
samprat
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Split QString at - (dash) character, list item access

I tried to split a QString (a filename) and I want to get parts between two dash signs in the filname. The Filname is for example "0000000398_05WA-1384864213-218.bmp" . However, QStringList query; QString filename; QDirIterator it(qDirPictures,…
refuzee
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What's the cleanest way to emit a signal when QString is changed? (Qt)

I have a global QString object, and I would like to tie any changes to it to emit a Signal that I could connect to in other parts of my code. I see that the QString Class doesn't have signals, so how would I go about doing this? I'm using PyQt, but…
sebo
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Can int values reset if too much is loaded at once?

In my C++ project, I have some int values (I am following two of them specifically). These values are input when the user loads a file. Their values (should) never change throughout the entire program. Later on in my program, I load about 30 MB of…
mrg95
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