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  1. Qt
  2. QTBUG-47192

[REG 5.4.2->5.5,0] Conversion from QVariant to QString is broken for double and float values

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Details

    • Bug
    • Resolution: Invalid
    • P1: Critical
    • None
    • 5.5.0
    • Core: QString and Unicode
    • None
    • Windows 8.1 x64; MSVC 2013 Community; Qt x32;

    Description

      Here is an example:

      #include <QCoreApplication>
#include <QDebug>

int main(int argc, char *argv[])
{
	QCoreApplication a(argc, argv);
	QVariant v = 800.79f;
	QVariant v2 = 800.79;

	qDebug() << v << v.type() << v.toString();
	qDebug() << v2 << v2.type() << v2.toString();

	return a.exec();
}

      Output with Qt 5.4.2: 

      QVariant(float, 800.79) "800.79"
QVariant(double, 800.79) "800.79"

      Output with Qt 5.5.0: 

      QVariant(float, 800.79) "800.789978"
QVariant(double, 800.79) "800.78999999999996"

      I write finance app and get data from database using QSqlQuery+QSqlRecord classes which convert DB's numeric fields into QMetaType::Double and this is pretty critical for me.

      Attachments

        Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTCREATORBUG-14757 [REG Qt 5.4.2 -> Qt 5.5.0] Input and output values differ in QML/JS Console

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed
          is required for

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-46863 Issues to be fixed before Qt 5.5.1

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-47070 [REG 5.4 - 5.5] QtQuick: Decimal value cannot be correctly set to string parameter

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed

          Activity

            People

              thiago Thiago Macieira
              aas AAS
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              Dates

                Created:
                Updated:
                Resolved: