reading utf8 as data stream.

[kami]

Hi,

Flash 10, action script 4 sends strings this way:
int16 describing size
then char * data.

To my knowledge, this type of string is not serialized in QT.

so i made this class:

class FlashDataStream : public QDataStream
{
	public:
		FlashDataStream () : QDataStream() {}
		FlashDataStream ( QIODevice * d ) :  QDataStream(d) {}
		FlashDataStream ( QByteArray * a, QIODevice::OpenMode mode )  :  QDataStream(a, mode) {}
		FlashDataStream ( const QByteArray & a ) : QDataStream (a ) {}
 
		QString ReadUTF8(qint16 maxsize = 4096)
		{
			Q_ASSERT(maxsize <= 4096);
 
			static char buffer[4096];
			qint16 stringlength;
			(*this) >> stringlength;
 
			if (stringlength < maxsize)
			{
				readRawData(&buffer[0] , stringlength); 
			}
			return QString::fromAscii(buffer, stringlength);
		}
 
		void WriteUTF8(QString data)
		{
			(*this) << data.size();
			writeRawData((char*)data.data(), data.size());
		}

class FlashDataStream : public QDataStream
{
	public:
		FlashDataStream () : QDataStream() {}
		FlashDataStream ( QIODevice * d ) :  QDataStream(d) {}
		FlashDataStream ( QByteArray * a, QIODevice::OpenMode mode )  :  QDataStream(a, mode) {}
		FlashDataStream ( const QByteArray & a ) : QDataStream (a ) {}
		
		QString ReadUTF8(qint16 maxsize = 4096)
		{
			Q_ASSERT(maxsize <= 4096);

			static char buffer[4096];
			qint16 stringlength;
			(*this) >> stringlength;

			if (stringlength < maxsize)
			{
				readRawData(&buffer[0] , stringlength); 
			}
			return QString::fromAscii(buffer, stringlength);
		}

		void WriteUTF8(QString data)
		{
			(*this) << data.size();
			writeRawData((char*)data.data(), data.size());
		}

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Now, my question is; There has got to be a better way of reading the string than having to copy those bytes twice. Is there a way to achieve what i am doing in one operation?

[jacek]

You could read the length and then use QTextStream.

Why do you use fromAscii() if you want to read UTF-8?