QByteArray 到 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?

Answer 1

You can use this QString constructor for conversion from QByteArray to QString:

QString(const QByteArray &ba)

QByteArray data;
QString DataAsString = QString(data);

Answer 2

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, ie 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).

Answer 3

您可以使用：

QString::fromStdString(byteArray.toStdString())

Answer 4

you can use QString::fromAscii()

QByteArray data = entity->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

Answer 5

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" .

Answer 6

Use QString::fromUtf16((ushort *)Data.data()) , as shown in the following code example:

#include <QCoreApplication>
#include <QDebug>

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() << "qba_test[" << qba_test << "]"; // Should see: qba_test[t

    QString qstr_test = QString::fromUtf16((ushort *)qba_test.data());
    qDebug().nospace().noquote() << "qstr_test[" << qstr_test << "]"; // 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.

Answer 7

QString a = "test";
QByteArray a1 = a.toUtf8();
QString backToString = a1;

Answer 8

Qt 4.8

QString(byteArray).toStdString();

Qt 5.12

byteArray.toStdString();

Answer 9

You can use:

QString DataAsString = data.trimmed();

Data is a QByteArray.