send UdpPacket with WriteDatagram

[Alexanov]

Hi
I want to send UDP packet from start point in QByteArrays datagram with specific length , How can i set start point(int type) in WriteDatagram line code?

//sample code
QUdpSocket::writeDatagram(const QByteArray &datagram, const QHostAddress &host, quint16 port)

[koahnig]

@Alexanov

You can't. There is writeDatagram for this.
Or you use QByteArray::mid

[Alexanov]

@koahnig
can you say me how can use WriteDatagram to specify start point?

[koahnig]

@Alexanov

How do you define your starting point?

one could be as folows when your starting point is after 10 bytes.

QUdpSocket *udp;
...


udp->writeDatagram ( bytearray.mid ( 10 ), address, port ); 

also you can get a number of byte out of the byte array by

QByteArray shorterArray = ba.mid ( 10, 12 );

This would extract 12 bytes starting after the 10th byte of ba. With

udp->writeDatagram ( shorterArray, address, port ); 

or you can do

udp->writeDatagram ( ba.mid (10, 12), address, port );