src_corelib_text_qstringconverter.cpp

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// Copyright (C) 2020 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#include <QStringConverter>
#include <QByteArray>
 
bool new_data_available();
QByteArray get_new_data();
 
void examples()
{
    {
        //! [0]
        QByteArray encodedString = "...";
        auto toUtf16 = QStringDecoder(QStringDecoder::Utf8);
        QString string = toUtf16(encodedString);
        //! [0]
    }
 
    {
        //! [1]
        QString string = "...";
        auto fromUtf16 = QStringEncoder(QStringEncoder::Utf8);
        QByteArray encodedString = fromUtf16(string);
        //! [1]
    }
 
    {
        //! [2]
        auto toUtf16 = QStringDecoder(QStringDecoder::Utf8);
 
        QString string;
        while (new_data_available() && !toUtf16.hasError()) {
            QByteArray chunk = get_new_data();
            string += toUtf16(chunk);
        }
        auto result = toUtf16.finalize();
        if (result.error != QStringDecoder::FinalizeResult::NoError) {
            // Handle error
        }
        //! [2]
    }
 
    {
        //! [3]
        auto fromUtf16 = QStringEncoder(QStringEncoder::Utf8);
 
        QByteArray encoded;
        while (new_data_available() && !fromUtf16.hasError()) {
            QString chunk = get_new_data();
            encoded += fromUtf16(chunk);
        }
        auto result = fromUtf16.finalize();
        if (result.error != QStringEncoder::FinalizeResult::NoError) {
            // Handle error
        }
        //! [3]
    }
 
    using namespace Qt::StringLiterals;
 
    {
        //! [4]
        QByteArray encodedString = "...";
        auto toUtf16 = QStringDecoder(QStringDecoder::Utf8);
        auto data = toUtf16(encodedString); // data's type is QStringDecoder::EncodedData<const QByteArray &>
        QString string = toUtf16(encodedString); // Implicit conversion to QString
 
        // Here you have to cast "data" to QString
        auto func = [&]() { return !toUtf16.hasError() ? QString(data) : u"foo"_s; };
        //! [4]
    }
 
    {
        //! [5]
        QString string = "...";
        auto fromUtf16 = QStringEncoder(QStringEncoder::Utf8);
        auto data = fromUtf16(string); // data's type is QStringEncoder::DecodedData<const QString &>
        QByteArray encodedString = fromUtf16(string); // Implicit conversion to QByteArray
 
        // Here you have to cast "data" to QByteArray
        auto func = [&]() { return !fromUtf16.hasError() ? QByteArray(data) : "foo"_ba; };
        //! [5]
    }
}