Problem with QString and QByteArray

[ts66]

Hi all,

Im am working on a program and have problems with handling a QByteArray string.
When I try to convert that QByteArray string to a QString with

QString newQString = QString(&oldQBytearrayString);

QString newQString = QString(&oldQBytearrayString);

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I do get the following error:

error: conversion from ‘QByteArray*’ to ‘QChar’ is ambiguous
/usr/include/QtCore/qchar.h:372:8: note: candidates are: QChar::QChar(int) <near match>
/usr/include/QtCore/qchar.h:371:8: note:                 QChar::QChar(uint) <near match>
/usr/include/QtCore/qchar.h:370:8: note:                 QChar::QChar(short int) <near match>
/usr/include/QtCore/qchar.h:81:12: note:                 QChar::QChar(ushort) <near match>
/usr/include/QtCore/qchar.h:77:36: note:                 QChar::QChar(uchar) <near match>
/usr/include/QtCore/qchar.h:76:36: note:                 QChar::QChar(char) <near match>

error: conversion from ‘QByteArray*’ to ‘QChar’ is ambiguous
/usr/include/QtCore/qchar.h:372:8: note: candidates are: QChar::QChar(int) <near match>
/usr/include/QtCore/qchar.h:371:8: note:                 QChar::QChar(uint) <near match>
/usr/include/QtCore/qchar.h:370:8: note:                 QChar::QChar(short int) <near match>
/usr/include/QtCore/qchar.h:81:12: note:                 QChar::QChar(ushort) <near match>
/usr/include/QtCore/qchar.h:77:36: note:                 QChar::QChar(uchar) <near match>
/usr/include/QtCore/qchar.h:76:36: note:                 QChar::QChar(char) <near match>

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The newQString is the output of a script of me and should be a plain text string.

What is going wrong here?


Code Snippet:

myclass.cpp

void myclass::Thefunction(){
 
     // QProcess *scriptcall; pointer declared as a public member in the class header file
     scriptcall = new QProcess(this);
     scriptcall -> start("./myscript");
 
    connect(scriptcall, SIGNAL(readyReadStandardOutput()), this, SLOT(Readoutput()));
 
}
 
void myclass::Readoutput(){
 
     QByteArray oldQByteArrayString;
     oldQByteArrayString = scriptcall -> readAllStandardOutput();
     QString newQString = QString(&oldQByteArrayString); //this line causes the error
 
}

void myclass::Thefunction(){

     // QProcess *scriptcall; pointer declared as a public member in the class header file
     scriptcall = new QProcess(this);
     scriptcall -> start("./myscript");

    connect(scriptcall, SIGNAL(readyReadStandardOutput()), this, SLOT(Readoutput()));

}

void myclass::Readoutput(){

     QByteArray oldQByteArrayString;
     oldQByteArrayString = scriptcall -> readAllStandardOutput();
     QString newQString = QString(&oldQByteArrayString); //this line causes the error

}

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Additional Information: I can use oldQByteArrayString with a function that requires QSTtring as a parameter without a problem. (QComboBox::addItem( const QString)). When I look at the hex code of oldQByteArray, it contains exactly what I want to be there - 4 ascii code letters, no special chars.

[mvuori]

Take the & off from here:
QString newQString = QString(&oldQBytearrayString); -> QString newQString = QString(oldQBytearrayString);

and it should work. A shorter form should also work: QString newQString(oldQBytearrayString);

[stampede]

Why do you want to pass an address of QByteArray to QString constructor ?
This will work :

QString newQString = QString(oldQBytearrayString);

QString newQString = QString(oldQBytearrayString);

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