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Nov 18th, 2007

How to transport a file with QTcpSock in LAN?

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Hello,everybody!

I'm writing a LAN communication programming,and I need to transport a file between different host computer.
I know that the TCP is a kind of stream-oriented connection.But look at the fallowing codes:

C++ Syntax (Toggle Plain Text)
void TripPlanner::sendRequest()
{
QByteArray block;
QDataStream out(&block, QIODevice::WriteOnly);
out.setVersion(QDataStream::Qt_4_1);
out << quint16(0) << quint8('S') << fromComboBox->currentText()
<< toComboBox->currentText() << dateEdit->date()
<< timeEdit->time();
if (departureRadioButton->isChecked()) {
out << quint8('D');
} else {
out << quint8('A');
}
out.device()->seek(0);
out << quint16(block.size() - sizeof(quint16));
tcpSocket.write(block);
statusLabel->setText(tr("Sending request..."));
}
void TripPlanner::sendRequest()
{
QByteArray block;
QDataStream out(&block, QIODevice::WriteOnly);
out.setVersion(QDataStream::Qt_4_1);
out << quint16(0) << quint8('S') << fromComboBox->currentText()
<< toComboBox->currentText() << dateEdit->date()
<< timeEdit->time();
if (departureRadioButton->isChecked()) {
out << quint8('D');
} else {
out << quint8('A');
}
out.device()->seek(0);
out << quint16(block.size() - sizeof(quint16));
tcpSocket.write(block);
statusLabel->setText(tr("Sending request..."));
}

I don't think it's a stream but a segment,do I?

And my other question is how to transport a file by TcpSocket.
I am Chinese,so the file may not be Enlish single,and the file may be alse a binary data file. How do I transport it?

I know that my English is poor,but I will try my best to exchange it!
Help me,please!
Thank anybody who look at this thread!

By the way, I had another question: what's the meaning of "hen & egg problem"(I'm not a English mother language men).

Last edited by cscgal; Nov 18th, 2007 at 4:34 pm. Reason: Added code tags

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meiyantao

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Nov 18th, 2007

Re: How to transport a file with QTcpSock in LAN?

chicken & egg proglem

If the file contains binary representation of integers then the bytes may have to be reversed on the receiving os. This is common problem when transferring files between MS-Windowos and *nix/Unix -- big endian little endian

As for your specific question -- I don't know, sorry.

Last edited by Ancient Dragon; Nov 18th, 2007 at 4:46 pm.

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Re: How to transport a file with QTcpSock in LAN?

Click to Expand / Collapse Quote originally posted by Ancient Dragon ...

chicken & egg proglem
Thanks! Maybe I could find it in google by myself first, I'm sorry for my lazy.

If the file contains binary representation of integers then the bytes may have to be reversed on the receiving os. This is common problem when transferring files between MS-Windowos and *nix/Unix -- big endian little endian
This is important for me. I guess that Qt may encapsulate it in an easy way.
As for your specific question -- I don't know, sorry.

You have help me so much!

meiyantao

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