How can i attach a user-speci​fied header to each UDP packet?

Hello,
i have here a question about UDP:
i want to stream live-videos using UDP. To avoid/observe some possible problems that could occur (e.g. wrong packet-order, packet loss etc.) i am planning to add a header to each UDP packet with e.g. frame-nr. , frame-size, packet-nr...
Question:
1. (How) Can i control the UDP packet size in LabVIEW?
2. If possible, how can i add a user specified header to each/certain (e.g. the first or the last packet of the frame) packet?
Thanks!
WLAN
Message Edited by wlan on 01-26-2007 03:02 AM

WLAN,
i just copied the help regarding the max size-terminal from the LV-help:
"max size is the maximum number of bytes to read. The default is 548. Windows If you wire a value other than 548 to this input, Windows might return an error because the function cannot read fewer bytes than are in a packet"
So, please do not change this value....
UDP creates packets from the data you transmitt. Each packet in Windows should have a size of 548 bytes or less. So this should read one whole packet at a time.... Decreasing this could lead to problems if the packet is larger.... Increasing this value changes nothing since the packets themselfs do not get larger only by trying to read more bytes..... Since you cannot alter the packetsize from LV, you shouldnt bother about that anymore.
And to add (again): UDP does not garantuee ANY correct transission. So you will never get any note if the first packet of a frame was lost. If you need some kind of garantuee for this, you have to use TCP (btw. infact, the TCP header uses 192 bytes, containing the infos like seen in the attached gif).
regards,
NorbertMessage Edited by Norbert B on 01-31-2007 11:12 AM
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.
Attachments:
tcp_header.gif ‏9 KB

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