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

[muellerp]

qint64 bytes = buffer->write(this->readAll());

what object is "this->"

[wysota]

What do you mean you can't write? The application doesn't compile, it returns some error, nothing is sent from the socket or nothing is received on the other side of the connection?

[succulent_lily]

what object is "this->"

"this->" means the socket

What do you mean you can't write? The application doesn't compile, it returns some error, nothing is sent from the socket or nothing is received on the other side of the connection?

thanks for your help
i wasn't explain the problem complicitly
this is the server code,the server can receive the client's message which send by socket,and give the message to the client back.
in my pc,it is run correctly.
but when the server received the client's message ,i want to send something else string back,such as"xxxxxxx",it can't run.
that is my problem

[succulent_lily]

Qt Code:

QByteArray line2("abcdefg");
QByteArray line = buffer->readLine();
write(line2);
write(buffer->readLine());

QByteArray line2("abcdefg");
QByteArray line = buffer->readLine();
write(line2);
write(buffer->readLine());

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when i run the code ，the client return abcdefg+（the data which go back）
but if i delete raw 2 and 4,nothing return

[wysota]

Are you sending a newline or otherwise flushing the socket?