why can't i write some string to the socket

[succulent_lily]

when i run the code ,it exec correctly
codes:

QBuffer* buffer = new QBuffer(this);
buffer->open(QIODevice::ReadWrite);
qint64 bytes = buffer->write(this->readAll());
buffer->seek(buffer->pos() - bytes);
while (buffer->canReadLine())
{
	QByteArray line = buffer->readLine();
	write(line);
}

QBuffer* buffer = new QBuffer(this);
buffer->open(QIODevice::ReadWrite);
qint64 bytes = buffer->write(this->readAll());
buffer->seek(buffer->pos() - bytes);
while (buffer->canReadLine())
{
	QByteArray line = buffer->readLine();
	write(line);
}

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but when i write("xxxxxxx"),or

QString s="xxxxxx"
write(s.toLatin1());
write(s.Ascii());
write(s.toLatin1().data());
..........................

QString s="xxxxxx"
write(s.toLatin1());
write(s.Ascii());
write(s.toLatin1().data());
..........................

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i can't write successlly,who can help me