c++ - 将 QByteArray 附加到 QDataStream？

Question

我必须用不同的数据填充QByteArray。所以我正在使用 QDataStream。

QByteArray buffer;
QDataStream stream(&buffer, QIODevice::WriteOnly);

qint8 dataHex= 0x04;
qint8 dataChar = 'V';

stream << dataHex<< dataChar;
qDebug() << buffer.toHex();  // "0456"  This is what I want

但是，我还想将 QByteArray 附加到 buffer。

QByteArray buffer;
QDataStream stream(&buffer, QIODevice::WriteOnly);

qint8 dataHex= 0x04;
qint8 dataChar = 'V';
QByteArray moreData = QByteArray::fromHex("ff");

stream << dataHex<< dataChar << moreData.data(); // char * QByteArray::data ()
qDebug() << buffer.toHex();  // "045600000002ff00"  I would like "0456ff"

我错过了什么？

Answer 1

当附加 char* 时，它假定 \0 终止并使用 writeBytes 序列化，这也首先写出大小(如 uint32)

writeBytes' doc:

Writes the length specifier len and the buffer s to the stream and returns a reference to the stream.

The len is serialized as a quint32, followed by len bytes from s. Note that the data is not encoded.

你可以使用writeRawData来规避它:

stream << dataHex<< dataChar;
stream.writeRawData(moreData.data(), moreDate.size());