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Qt convert string to double. 57", i am getting this result=12345.


Qt convert string to double The given byte array is converted to Unicode using fromUtf8(). 64 to 2. Jan 3, 2013 · Please note that string handling changed since Qt 5. I know there is the function QString::number() that can be used for other types like int and double, like so: int a = 1; QString b = QString::number(a); Nov 19, 2015 · Hello everybody, i have a vector filled with Strings and i want to convert them into double numbers to use them as data points in a graph. xx, i. 94519; double value = str. For the string conversion you can use e. That was @ChrisW67 What does this have to do with Qt? because i used "stof" in most of my code when i was using visual c++ it worked fine but when i used it in qtcreator there were errors and now "atof" working just fine for me thanks I'm trying to validate user input by using the QString::toDouble() function. ToDouble(s2); double d3 = d2 * d1; Nov 30, 2021 · The question: is there some way to convert string to double, that is not system-dependent? Preferably fast. Apr 29, 2017 · You probably have some extra info in your string. com/questions/4754011/c-string-to-double-conversion May 8, 2014 · Can anyone tell me how to convert String to double or long long value ? I mean I want a double or long long result. 7 new features list, there is this note: Added the ability to convert a floating point to its shortest, exact string form, without having to pre-calculate how many digits that is; QVariant uses this Apr 14, 2015 · void foo(int bar, int baz = 0, string qux = "Default String") what this means is that there is a function "foo" that takes as parameters an int, an int, and a string, in that order. I would like to convert them to a hh:mm:ss format string. My current code looks like this: QVector Feb 3, 2021 · @SGaist Hmm. Or should I invent my own converter? xD Today I tried out some new functions of the C++11 STL and encountered std::to_string. 712001". int i = ((QString)"294. toDouble(); //convert the first part to double Abcd. one of these functions . . 34. It is like this in hexadecimal format: char buffer[17] = "4053E60C49BA5E35"; In double the correct value is: 21,898625. Interesting that an attempt to convert QVariant toInt() results to a tuple such as: (0, False) or (123, True) May 23, 2020 · @Ketan__Patel__0011 said in std::string to QString can't convert properly:. In this article, we will learn how to convert strings to double in C++. I just need to convert a number that is represented as a float object into a QString object. Using stod() Function. As you can see your string contains also \u0000. I want the answer to be shown in a non-string format. c_str()); @ Mar 29, 2019 · I have a string in byte that represent a double number. I need a simple way to convert this string in double. I would like to convert a QString value into a long number. I need to convert that hex string to a double number. toUpper(); There is nothing about being smart in this case. Character arrays are internally interpreted as being UTF-8 encoded. Preferably without using external libraries. 647. 7 new features list, there is this note: Added the ability to convert a floating point to its shortest, exact string form, without having to pre-calculate how many digits that is; QVariant uses this Jan 13, 2018 · Convert the string 0. I need to know the best way to convert a string to a double with little loss from the data. How to do that? For example double secs = 120; would be 00:02:00. Aug 25, 2014 · to different variable. 3999 is the best it can represent and that is what the result is. Qt converting string to int in base 16 but remain the value of base 16. 00"; double d1 = Convert. In Qt, Unicode characters are 16-bit entities without any markup or structure. Oct 16, 2012 · I have the following code in my application whereby I need to parse a string and convert it to double. Jan 24, 2023 · @Dean21 said in converting from float or double to QString results in output being 0: 5. On Solaris (and in fact most other systems, including VC++) the double is assigned to a 64 bit register where it is represented as slightly bigger then 0. – Apr 4, 2017 · In Qt5 use fromSecsSinceEpoch instead of fromTime_t. Ask Question Asked 10 years Aug 22, 2013 · What I'm trying to do is to convert a double to hex string and then back to double. I will write the constructed string to a serial device, and a program on the other device will expect this format to do something with it. I need to convert a long double value into a string (ideally a QString, but could be something else). I want convert string to double . The strangest thing is that it works fine running in Debug mode, but running the application normally, the decimal digits desappear from the variable. So if I have these two variables: double num = 12. It is kind of Mar 5, 2016 · In the Qt 5. In the end i want these variables to double type but using the qDebug my output is 0 "4, so 0 is for lat which means the conversion failed and "4 is for latitude but why only the first character? The string is many bytes long. 285072743893E-04") to double without compromising the precision. What does this have to do with Qt? One of quite a few options: @ #include #include std::string test("0. really any sensible type. Regards Mar 11, 2016 · The floating-point double type can not exactly represent the value 1234567890123. On a side note another variation of number conversion to a string is this: Sep 15, 2018 · I want to convert QString("3. The compiler says "No matchin fuction to cal for QStriing::QString(const Coordinate&, const Coordinate&) Apr 13, 2016 · Anyway, to convert a QByteArray to a hex string, you got lucky: just use QByteArray::toHex() method! QByteArray ba_as_hex_string = ba. 73628\u0000. 95. EDIT: The format needs to be xxx. parseInt("011", 10) will give you the result you expect! Mar 27, 2019 · You can instantiate another QDateTime object to the same time but having the TimeSpec as Qt::LocalTime or Qt::TimeZone. begin()); However the destination QVector still is empty. if any one known please help me. Over 90 percent of questions asked here gets answered. IEEE-754) can not exactly represent all real numbers, hence these use approximations for most cases. Jun 22, 2015 · C++ unsigned int to double conversion. When number is -0. Your output Jul 23, 2019 · Hello is there any function that can convert QString hex to Float directly. 0. prepare(s); // You only need to prepare the query once // To actually insert values into colA Jan 4, 2014 · How Can I convert QString to decimal ? In C# code it look like that: public static decimal ConvertToDecimal(string tekst, bool upperOnly) { decimal num = 0m; decimal num2 = 1m; string text = uppe Feb 11, 2014 · May you please assist me wiht QString. QStringConverter may support more encodings depending on how Qt was compiled. :) It makes no sense to do something like @ text: parseFloat("20") @ Feb 3, 2021 · I am new in qt. If this is true, post the code that you are using. QString Abcd = "123. 525} has only an infinite length representation in base 10. :) It makes no sense to do something like @ text: parseFloat("20") @ Jan 20, 2019 · convert the String to int/long/longlong with e. You have to know which encoding the std::string is and use the correct conversion with the help of e. Hence my question. What is the best way to Jul 9, 2010 · Yet another option is to use QTextStream and the << operator in much the same way as you would use cout in C++:. 52500000000000002 is truncated to the number of decimal positions that cover the number of mantissa bits in IEEE-754 double precision binary representation. Apr 14, 2015 · I am using the usual method of converting a float to a string in Qt like this: ui->Display->setText(QString::number(floater)); And this works pretty fine for small numbers all the way up to 6 digits, at 7 digits (for example 1234567) the string will look something like this:. Jul 9, 2012 · Double. toDouble(); @ My Output while converting it to double is 100. I have a problem while converting a string value to double. Sep 13, 2012 · I'm reading from an xml file and trying to parse the data to a double. arg(dbl); This overcomes the problem of: "Fixed precision" at the other functions like: setNum() and number(), which will generate random numbers to complete the defined precision Apr 29, 2017 · C++ how tp convert a sprintf vale into a floating point number? Wrong string to double conversion in Apr 24, 2012 · I have a QString myNumber containing "09338. TryParse(String, Double); This will help you in determining what is wrong in each of the string first before you do the actual parsing. Mar 27, 2014 · In my project, I read a double variable as hex and load it into a string. Please help me to solve this problem. 0. 00". The following code does conversion double-to-hex string. 525"; bool status = false; double doubleVal = value. Jan 20, 2015 · "The user may input anything. 75"; double gpa = gpaString. Thank you. length() Feb 2, 2012 · I want to take data from the user as a string and then convert it into a double to preform calculations. 54". Regards A string solution, like QString::arg() or @J-Hilk's QLocale::toString(), which allows you to request the number formatted to a locale (thousand separator character, decimal point character) and to a specified precision (more than the default 6 digits) is what you want. length() Aug 1, 2020 · First, you should be aware that all C++ doubles are approximate values. 03 Apr 24, 2012 · I have a QString myNumber containing "09338. However, the last two in this example, baz and qux, have default parameters given to them (0 and "Default String") respectively. In the editor I get implicit conversion increases floating-point precision: 'float' to 'double'. How would I convert this string so that I can use it in calculations? I've tried with: string s1 = "2"; string s2 = "25. The only way that work just now is this, but I'm not sure it this the best way: Nov 22, 2007 · Qt Centre is a community site devoted to programming in C++ using the Qt framework. The String looks like: "2008:09:23 14:18:03 and have a length of 20. Instead, consider using QTextStream or arg(), both of which support Unicode strings seamlessly and are type-safe. I currently use this: double hexstr2double(const std::string&amp; h Feb 3, 2021 · A string solution, like QString::arg() or @J-Hilk's QLocale::toString(), which allows you to request the number formatted to a locale (thousand separator character, decimal point character) and to a specified precision (more than the default 6 digits) is what you want. Thanks Here is an example taking the code from the OP and splitting the QString to a QStringList then using foreach to iterate over the list converting each QString in the list to a double then printing the double using cout: Oct 15, 2014 · Binary representation of those double (your code, which probably has problem with memory management, if you need deep copy use QByteArray::QByteArray ( const char * data, int size )), or do you need convert this to text representation of those values (@Silicomancer answer)? I recommend that you describe exactly what you are doing with those data. E. The double number represents a temperature result which changes between -40 and 150. You can e. These are relevant parts of my code: Nov 10, 2014 · Please tell us what do you store in those double values and what do you really want to do. toDouble(&amp;status); The value I get for dou Jun 15, 2015 · One option to eliminate rounding, if possible, is to have the table setup with floating point types as opposed to using a string. If you are looking for information about Qt related issue — register and post your question. Oct 30, 2019 · The string conversion will always happen in the 'C' locale. For locale dependent conversion use QLocale::toFloat() For historical reasons, this function does not handle thousands group separators. ToDouble(s1); double d2 = Convert. 0 it's impossible to say whether it meant to be a double or QJsonValue unless you explicitly specify the type of the variant. So you have to split by space. I'm developping in C++, using the Qt framework. The problem is the double value is converting to 2 decimals. I solved it by using a conversion to std::string thusly: std::string tsSS2 = std::to_string(tStamp); which converted an int64 (tStamp) to a std::string and then when I issued: qDebug << tsSS2; It printed the number without scientific notation (SN). I need a more precise way doing converting. QString value = "0. Neo4j/Cypher: Convert string to double. QVector<char*> vector_char; QStringList myStringList = vector_char. 25874601; QString str = QString("%1"). Use qDebug() to see what is going on: #include <QDebug> // void setNewValue(const QString& fhStr) { bool ok(false); double d = fhStr. toList(); This code has to work as QStringList has inherited members of QList. When i used string. toDouble() i am getting this result = 12345. Therefore, if you write it into a double, the value is rounded to the next possible double value, which is 1. 1 the problem is that in general everything works, examples from Qwt compile without ANY problems, but when I try to convert from QPointF. Does anyone know ho I am trying to append a double to a QString in such that 12. toString Sep 28, 2018 · Im searching Decimal To Binary Conversion function and Vice-versa in Qt. 57", i am getting this result=12345. The string value is a QString and is converted to a double simply using the toDouble() function. x to double I get er May 5, 2016 · Convert integer back to Hex string, using Qt. Regards Feb 15, 2017 · Wrong string to double conversion in Qt QString. So far, I always used QString::number() for numerical->string conversion, but there is no overloading for the long doubletype. If you need to convert such numbers, use QLocale::toFloat(). You are probably getting errors, that you don't specify, because std::stof() is part of C++11 and your compi May 8, 2014 · Ah sorry I misunderstood you, I thought you wanted to convert a string to a number, but if you want to add comma you want to convert a number to a string (numbers can't have commas of course, so you need a string to display the number as a formatted string). 54, why i can't this result ? Also when i changed string this = "12345. It can be done simple with following: public static double FromPercentageString(this string value) { return double. Take a look at wiki. Is any other approach with IFormatProvider or something like this? Jun 28, 2016 · All I really want to do is in the question. 10, Qt 4, Qwt 6. 78240 but instead is 0. So, I want all digits of string to be shown without losing any digit during display. Below is my code. I'm new to Qt, maybe there's something I'm missing. How to remove minus sign for this situation ? Dec 25, 2014 · How to implement if/elif/else inside of setData() to distinguish if the received QVariant is a string or an integer? (so a proper QVariant conversion method (such as . May 8, 2014 · Ah sorry I misunderstood you, I thought you wanted to convert a string to a number, but if you want to add comma you want to convert a number to a string (numbers can't have commas of course, so you need a string to display the number as a formatted string). toInt(bool *ok = NULLPTR, int base = 10) called with base =16; convert the resulting value to double if ok is true; Anyway, setting the resulting value back into your lineEdit seems not to be the best idea Oct 15, 2014 · You can easily convert the string into a QByteArray using s. 5 , i want this result=12345. 78240 to a double, which should be 0. It is reading the data and displays the appropriate string in the application output but wont convert from string to double. If you need to let Qt know that QVariant stores QJsonValue you have to construct QVariant out of QJsonValue with QVariant::QVariant(const QJsonValue &val). It is lightweight, so it can be used everywhere. Regards Sep 23, 2013 · I'm a new bie in qt. I have QStrings, I want to convert them to: int, int64_t, quint32, double, QStrings, etc. Oct 27, 2013 · There is really only one way to do it, and that is to convert the string to an integer, put it in a union where you set an integer member and read out a double member. s. :) It makes no sense to do something like @ text: parseFloat("20") @ Jun 17, 2013 · This is a Qt forum, neither std::string nor stof() is part of Qt, and no other part of your question implicates Qt in any way. 0278; QString qtString = QString(). If you have value 1. Dec 3, 2016 · I am new to Qt Creator. 001 and i set precition 2, it return -0. Regards std::string to double i tried stof but it didn't work i kept getting errors it didn't recognize it Jun 17, 2013 · This is a Qt forum, neither std::string nor stof() is part of Qt, and no other part of your question implicates Qt in any way. Feb 11, 2013 · Well, although both convert the double to an int by rounding down, on gcc on Linux the double is assigned to a FPU 80 bit register where it is represented by a number slightly less than 0. 56" or "12345. Parse(value. The Vector is filled with Strings, because it gets the values from a table. See example code below. May 20, 2015 · I have stored a double (-0. 147. 000328507. Aug 1, 2011 · parseInt("11") will always result in 11, however parseInt("011"), because the string starts with 0, it will be interpreted as OCTAL, with a result of 9! Hard to track down bugs ahoy. I am simulating some kind of climate chamber. I'm writing an application for a large calculation Jan 13, 2025 · Converts a QString object (representing a string) to a double-precision floating-point number (double). I think number format is wrong and system does not recognize it, how can i set right format Jun 14, 2016 · to convert QByteArray to QString, then write it into file by QTextStream. Lovely, lovely set of functions. TryParse(String, NumberStyles, IFormatProvider, Double); Feb 3, 2021 · A string solution, like QString::arg() or @J-Hilk's QLocale::toString(), which allows you to request the number formatted to a locale (thousand separator character, decimal point character) and to a specified precision (more than the default 6 digits) is what you want. Feb 3, 2021 · A string solution, like QString::arg() or @J-Hilk's QLocale::toString(), which allows you to request the number formatted to a locale (thousand separator character, decimal point character) and to a specified precision (more than the default 6 digits) is what you want. toInt(); //convert the first part to Int Abcd. If more codecs are supported, they can be listed using availableCodecs(). Jun 17, 2013 · It is recommended to use QString for Qt projects but if you insists on using std::string you can easily find solution in similar topics: "C++ string to double conversion": http://stackoverflow. I had a similar problem using int64. Jul 31, 2021 · It seems like a stupid question, but in Qt Creator neither std::stof nor std::atoi are working to convert a std::string to a floating point value. asprintf("%0. Jul 18, 2017 · @Rondog Afaic, int type reserves 32 bit as signed -> −2. Thats all there is. three before the decimal and two after, always. toDouble(); double value2 = QString(tempCN[0]). toHex(); Note that it returns 8-bit text, but you can just assign it to a QString without worrying much about encodings, since it is pure ASCII. QString::QString(const QByteArray &ba) Constructs a string initialized with the byte array ba. We can convert String to Double in C++ using the following methods: Using stod() Function; Using stold() Function; Using atof May 8, 2014 · Ah sorry I misunderstood you, I thought you wanted to convert a string to a number, but if you want to add comma you want to convert a number to a string (numbers can't have commas of course, so you need a string to display the number as a formatted string). toDouble(); Convert a number to a QString, and format it to two decimal places: double price = 89. toString() or toInt()) is used) P. The Problem is, if i remove the first character the output looks like: "008:09:23 14:18:03. 6"); double value = ::atof(test. the value 1. " That doesn't give us much to go by, but I can give you an example of how I would set up a basic insert query. 55 is not possible to be represented by a double. c_str()); Sep 24, 2019 · I'm trying to convert a string to float and vice versa but the compiler complains about it. It is for an assignment - so I cannot change the classes. Syntax double QString::toDouble ( bool *ok = nullptr ) const ; Aug 4, 2023 · We can convert String to Double in C++ using the following methods: Using stod() Function; Using stold() Function; Using atof() Function; Let’s discuss each of these methods in detail. It is a library function defined inside <string. I do not want to have a separate function for each type but something that I showed above. I am looking for a way to do the conversion. 34 be displayed as 012. Thanks Jan 11, 2012 · double value1 = QString(tempSL[0]). 1643) as string ("-0. Note that floating point types (e. split(" ")[0]. Jun 17, 2013 · This is a Qt forum, neither std::string nor stof() is part of Qt, and no other part of your question implicates Qt in any way. Regards Feb 3, 2021 · @SGaist Hmm. 55000000000000004440892098501. 4 and 1234567890123. toFloat(); //convert the first part to float Update: I am updating an old answer. I currently use this: double hexstr2double(const std::string&amp; h Aug 4, 2023 · There are situations, where we need to convert textual data into numerical values for various calculations. For durations longer than 24h you can adjust the formatter: QDateTime::fromSecsSinceEpoch( 10, Qt::UTC ). Remember to include the necessary Qt class headers for QString and QLocale! Convert a QString to a std::string: std::string myString = qtString. Jan 27, 2016 · Do you mean a C string, as in a char* string, or a C++ std::string object? Either way, you use the same constructor, as documented in the QT reference: Qt QString Reference Feb 3, 2021 · @SGaist Hmm. convert to local time with QDateTime::toLocalTime or to either Qt::LocalTime or Qt::TimeZone with QDateTime::fromSecsSinceEpoch which accepts offset seconds for time zone. SubString(0, value. begin(), source. Thank You. My QTableView contains data as QVector&lt;QString&gt;, which is want to plot. It cannot represent all the possible floating point values, only certain discrete ones. The database itself is independent from Qt and understands its own data-types - it does not know anything about QDate. Here is an example taking the code from the OP and splitting the QString to a QStringList then using foreach to iterate over the list converting each QString in the list to a double then printing the double using cout: Jun 15, 2012 · I think you can try do it in this way (it works for me if I have a QVector<QString>):. I am aware of atof convertion. Does anyone know ho Mar 7, 2022 · @Swati777999 said in Type Conversion : from QString to float and double:. @std::string message(usb_data. Convert to uppercase (optional) qDebug() << result. Are the double values encoding Aug 19, 2017 · I have a QString StrData = "abcd" and I want get the Ascii value in hex of that string and Vice Versa. Feb 3, 2021 · @SGaist Hmm. How would I do this? long s; QString x = &quot;6458621237&quot;; EDIT As a result I'll have long s = 6458621237; Nov 3, 2022 · double dbl = 0. Or float, whatever suits best for this type of conversion. 34; QString str = "literal "; I want to append the number to the string so it results in literal 012. May 5, 2015 · QCustomPlot takes a QVector&lt;double&gt; variable. 78239999999999998 when i look at it in the debugger. Jun 15, 2020 · @VikramSamy said in convert a string to QDate in specified format: but i was just thinking, the database are written by a QT program. Creating a stringstream object for just one double-to-string conversion always seemed overkill to me, so I'm glad we can now do something like this: Feb 26, 2020 · I tried copy content of one vector to a QVector using the following std::copy(source. After that, read file by QTextStream, use: QString::toUtf8() to convert QString to QByteArray. 00. end(), dest. 1643") in a property on a neo4j relationship. How to convert a float value into an array of May 19, 2013 · You don't have all digit characters in your string. This convertion truncates the data by rounding. However, every time I do so, I get the value of 29439. toDouble(); Im not sure of your application but this is how I would do it if I were possibly going to need the units in the future (which are located in the 2nd element of the stringlists). Length - 1)) / 100; } but I don't want to use this parsing approach. QTextCodec. We can convert String to Double in C++ using the following methods: Using stod() Function; Using stold() Function; Using atof Mar 27, 2014 · In my project, I read a double variable as hex and load it into a string. Jul 29, 2016 · I am getting wrong conversion value from QString to double. For example from "abcd" to "61 62 63 64" and from "61 62 63 64 Aug 16, 2014 · I need to convert a string to double. Methods to Convert String to Double. T Mar 13, 2014 · This seems like it should be very simple, but I'm going through the docs and not seeing anything. Provide details and share your research! But avoid …. I find this use of C++ streams (and <<) hard to get my head around, logically!If you can go qDebug() << value to print out a value, I find it conceptually difficult to send qSetRealNumberPrecision(12) to the operator in the same way. FFFFFFFF needs at least uint32_t. char * double2HexString(double a) { char *buf = new Jun 17, 2013 · What does this have to do with Qt? One of quite a few options: @ #include <string> #include <cstdlib> std::string test("0. convert from string to double fails to convert as expected. If you have a culture-related problem, you might consider using: Double. Jun 26, 2017 · I'm having a hard time of converting std::string to QVariant and QVariant back to std::string. When I use QString::toDouble the result is 0. Of course you can convert QDate to a string of any format, see QDate::toString(). Warning: We do not recommend using QString::sprintf() in new Qt code. io/Strings_and_encodings_in_Qt for more information. If speed is important there also is: QByteArray ba = QByteArray::number(d); // method has options for format and precision, see docs Feb 3, 2021 · I am new in qt. The documentation says the function should be used like this: double QString::toDouble ( bool * ok = 0 ) const; /* Jul 13, 2018 · @SamurayH said in convert QString list to QList<int>: QList<QList<int>> time2Int(const QStringList& timeList) thank you QList<QList<int>> time2Int(const QStringList& timeList) returns the (1,8,2,1,0,3) stringlist can not be converted to the same type (18:21:03)? I need string list to be converted to the same type(18:21:03 ) and still I get Jun 1, 2011 · The explanation why it happens is how a double is stored. toLatin1() if really necessary. 4"). 5%" and want to convert it to double value. I am new to Qt and not so good at C++ either, kind of learning as I make this. First remove the trailing zero byte (\u0000) from the string then do the conversion. I have read somewhere that it is just a matter of how the value is displayed. 2. toUtf8() or s. QStringConverters can be used as follows to convert some encoded string to and from UTF-16. h> header file Convert a QString to an integer: QString myString = "42"; int theAnswer = myString. In both cases I end up with empty value (default QVariant, just like it was initialized with no parameters) and empty std::string (""). 5 Kb"; Abcd. i have a problem to convert a QString to a QDataTime-Object. Asking for help, clarification, or responding to other answers. constData(), 60); //usb_data. When I do: myNumber. e. Curiously it printed it with a decimal point and trailing zeros. My string is= "12345. toDouble() * 100; I am supposed to see the value 29440 as a value of i. May 28, 2012 · I'm using Ubuntu 11. Qt has to stay free or it will die. Hot Network Questions Feb 17, 2011 · Here is how you do it just using the std::lib (no QT). This is why, for example, you should not compare floating points values for equality with ==, and Qt provides qFuzzyCompare. The string is "25. Seems like the function toInt() doesn't simply return the overflow, but does not convert at all, if the Number is bigger than the reserved memory. 483. I am new in qt. Second, you are using qDebug() << doubleValue. In C++, the stod() function performs a string to double conversion. Regards Jun 15, 2015 · I have a number of seconds stored in a double format (but they are integer values if that's to be concerned). This class represents such an entity. toDouble(&ok); if (ok) { m_newValue = d; } qDebug() << fhStr << ok << m_newValue; } Feb 3, 2021 · A string solution, like QString::arg() or @J-Hilk's QLocale::toString(), which allows you to request the number formatted to a locale (thousand separator character, decimal point character) and to a specified precision (more than the default 6 digits) is what you want. Also this might be interesting https://forum I have a string like "1. Feb 9, 2012 · The QChar class provides a 16-bit Unicode character. Aug 4, 2023 · There are situations, where we need to convert textual data into numerical values for various calculations. QPoint point(5,1); QString str; QTextStream(&str Feb 3, 2021 · I am new in qt. 3. If the table already exists and cannot be changed then this may not be an option unless the related software is adjusted. 712001. QString myValue = "äöü"; for example should be avoided at least if the source file it self is not stored in UTF-8. Suppose you have some string encoded in UTF-8, and want to convert it to a QString. 6. qt. but I'm not converting a float to double at least not as far as I know. // I assume you already have a QSqlDatabase object called 'db' QSqlQuery query(db); QString s = "INSERT INTO table (colA, colB) VALUES (:valA, :valB);" query. toStdString(); Convert a std::string to a QString: std::string myString = “Do you like football?”; QString qtString = QString::fromStdString(myString); Convert a number to a QString: Mar 5, 2016 · In the Qt 5. Jun 10, 2020 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. QString::. 71, but I want the double to be the original value, which is 09338. 00 but want 0. Feb 19, 2018 · @QtVik said in Issue in converting the string to integer!: I am unable to convert the string characters to integer in the following QString: Example: QString myString("\000#\001#\002#\003#\004#\005"); I'm guessing that this line don't exist in your code. And preferably in modern C++ slyle. Define your own numpunct-derived class which can specify decimal point, grouping character, and even the spacing between groupings. toDouble();, it returns 9338. Apr 14, 2015 · I am using the usual method of converting a float to a string in Qt like this: ui->Display->setText(QString::number(floater)); And this works pretty fine for small numbers all the way up to 6 digits, at 7 digits (for example 1234567) the string will look something like this: Apr 8, 2012 · I try to fetch a float number from a QString using toFloat() method but i get 0 for every number i fetch. If all you need is to translate the doubles into string representation of the numbers, here is a simple way to do it: @ foreach (double d, vec) {arr += QByteArray::number(d);} @ But I suspect your use case is different. But i want the same string value to be converted as a double value. Jul 29, 2016 · The double{0. 2f", price); // 89. My string value is @QString str = 100. g. You are probably getting errors, that you don't specify, because std::stof() is part of C++11 and your compiler, which you also did not specify, is defaulting to an earlier C++ standard. The number 0. toInt(); Convert a QString to a double: QString gpaString = "3. QString result = QString::number( nValue, 16 ); Step 3. Feb 3, 2021 · I am new in qt. Most compilers treat it like a unsigned short. 1. Jul 15, 2015 · I want to convert floating point number to Qstring object. Nov 3, 2022 · double dbl = 0. cuzcl lhfbt hewhz ixgif jhzexju cqeav czx pwmaj bdi klg