DaniWeb Forum Index > Software Development > C++

How to transport a file with QTcpSock in LAN?

Please support our C++ advertiser: Programming Forums - DaniWeb Sister Site

•

Join Date: May 2007

Posts: 32

Reputation: meiyantao is an unknown quantity at this point

Solved Threads: 0

meiyantao

Offline

Light Poster

How to transport a file with QTcpSock in LAN?

Nov 18th, 2007

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:

 Help with Code Tags 
 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

•

Join Date: Aug 2005

Posts: 15,678

Reputation: Ancient Dragon has a reputation beyond repute

Solved Threads: 1504

Ancient Dragon Ancient Dragon is offline

Offline

Still Learning

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

Nov 18th, 2007

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.

Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.

•

Join Date: May 2007

Posts: 32

Reputation: meiyantao is an unknown quantity at this point

Solved Threads: 0

meiyantao

Offline

Light Poster

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

Nov 18th, 2007

•

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!