QByteArray to QString

Question

I m having issues with QByteArray and QString   I m reading a file and stores its information in a QByteArray  The file is in unicode  so it contains something like  t 0 e 0 s 0 t 0  0  0  I m trying to compare this value to my specified value  but it fails  because in the debugger I see it s not an unicode string   The code will explain everything   QByteArray Data    contains unicode string  t 0 e 0 s 0 t 0  0  0  QString myValue    test     value to compare  if Data contains myValue         do some stuff  else       do other stuff    In the debugger  it shows me that the variable Data has the value  t 0 e 0 s 0 t 0  0  0  and myValue has the value  test   How can I fix it

User · Accepted Answer

You can use QTextCodec to convert the bytearray to a string:

QString DataAsString = QTextCodec::codecForMib(1015)->toUnicode(Data);

(1015 is UTF-16, 1014 UTF-16LE, 1013 UTF-16BE, 106 UTF-8)

From your example we can see that the string "test" is encoded as "t\0 e\0 s\0 t\0 \0 \0" in your encoding, i.e. every ascii character is followed by a \0-byte, or resp. every ascii character is encoded as 2 bytes. The only unicode encoding in which ascii letters are encoded in this way, are UTF-16 or UCS-2 (which is a restricted version of UTF-16), so in your case the 1015 mib is needed (assuming your local endianess is the same as the input endianess).

User · Answer

Qt 4 8   QString byteArray  toStdString      Qt 5 12  byteArray toStdString

User · Answer

You may find QString  fromUtf8   also useful   For QByteArray input of   010  and   000    QString  fromLocal8Bit input  1  returns   010  and     QString  fromUtf8 input  1  correctly returns   010  and   000

User · Answer

You can use this QString constructor for conversion from QByteArray to QString    QString const QByteArray  amp ba   QByteArray data  QString DataAsString   QString data

User · Answer

you can use QString  fromAscii    QByteArray data   entity- gt getData    QString s data   QString  fromAscii data data       with data   returning a char   for QT5  you should use fromCString   instead  as fromAscii   is deprecated  see https   bugreports qt-project org browse QTBUG-21872 https   bugreports qt io browse QTBUG-21872

User · Answer

You can use   QString  fromStdString byteArray toStdString

User · Answer

Use QString  fromUtf16  ushort   Data data     as shown in the following code example    include  lt QCoreApplication gt   include  lt QDebug gt   int main int argc  char  argv          QCoreApplication a argc  argv           QByteArray to QString                                   const char c test 10      t     0    e     0    s     0    t     0     0     0        QByteArray qba test QByteArray  fromRawData c test  10        qDebug   nospace   noquote    lt  lt   qba test    lt  lt  qba test  lt  lt          Should see  qba test t      QString qstr test   QString  fromUtf16  ushort   qba test data         qDebug   nospace   noquote    lt  lt   qstr test    lt  lt  qstr test  lt  lt          Should see  qstr test test       return a exec        This is an alternative solution to the one using QTextCodec  The code has been tested using Qt 5 4

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