QStringDecoder Class▲
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Header: QStringDecoder
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CMake:
find_package(Qt6 REQUIRED COMPONENTS Core)
target_link_libraries(mytarget PRIVATE Qt6::Core)
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qmake: QT += core
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Inherits: QStringConverter
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Group: QStringDecoder is part of i18n
Detailed Description▲
A text decoder converts text an encoded text format that uses a specific encoding into Qt's internal representation.
Converting encoded data into a QString can be achieved using the following code:
QByteArray encodedString = "...";
auto toUtf16 = QStringDecoder(QStringDecoder::Utf8);
QString string = toUtf16(encodedString);The decoder remembers any state that is required between calls, so converting data received in chunks, for example, when receiving it over a network, is just as easy, by calling the decoder whenever new data is available:
auto toUtf16 = QStringDecoder(QStringDecoder::Utf8);
QString string;
while (new_data_available()) {
QByteArray chunk = get_new_data();
string += toUtf16(chunk);
}The QStringDecoder object maintains state between chunks and therefore works correctly even if chunks are split in the middle of a multi-byte character sequence.
QStringDecoder objects can't be copied because of their internal state, but can be moved.
See Also▲
See also QStringConverter, QStringEncoder
Member Function Documentation▲
QString QStringDecoder::decode(QByteArrayView ba)▲
QString QStringDecoder::decode(const QByteArray &ba)
QString QStringDecoder::operator()(QByteArrayView ba)
QString QStringDecoder::operator()(const QByteArray &ba)
Converts ba and returns the data as a QString.
[explicit constexpr] QStringDecoder::QStringDecoder(QStringConverter::Encoding encoding, QStringConverter::Flags flags = Flag::Default)▲
Creates an decoder object using encoding and flags.
[constexpr] QStringDecoder::QStringDecoder()▲
Default constructs an decoder. The default decoder is not valid, and can't be used for converting text.
[explicit] QStringDecoder::QStringDecoder(const char *name, QStringConverter::Flags flags = Flag::Default)▲
Creates an decoder object using name and flags. If name is not the name of a known encoding an invalid converter will get created.
See Also▲
See also isValid()
QChar *QStringDecoder::appendToBuffer(QChar *out, QByteArrayView in)▲
Decodes the sequence of bytes viewed by in and writes the decoded result into the buffer starting at out. Returns a pointer to the end of data written.
out needs to be large enough to be able to hold all the decoded data. Use requiredSpace to determine the maximum size requirements to decode an encoded data buffer of in.size() bytes.
See Also▲
See also requiredSpace
[static] QStringDecoder QStringDecoder::decoderForHtml(QByteArrayView data)▲
Tries to determine the encoding of the HTML in data by looking at leading byte order marks or a charset specifier in the HTML meta tag and returns a QStringDecoder matching the encoding. If the returned decoder is not valid, the encoding specified is not supported by QStringConverter. If no encoding is detected, the method returns a decoder for Utf8.
See Also▲
See also isValid()
qsizetype QStringDecoder::requiredSpace(qsizetype inputLength) const▲
Returns the maximum amount of UTF-16 code units required to be able to process inputLength encoded data.
See Also▲
See also appendToBuffer