[Ethereal-dev] Buffers and pointers in a dissector

[Paul Smith]

I am attempting to write my first dissector for Ethereal. The most efficient way that I can work out to do this particular dissector isto define a structure that is the right shape for the elements of the protocol. Then simply assign a pointer of this type to the start of the buffer. Can I do this in Ethereal?   Example:   struct udp {     unsigned short source_port;     unsigned short destination_port     unsigned short length;     unsigned short checksum; }   struct udp_header *udp_hdr;   udp_hdr=(struct udp_header*)data_buffer   I cannot work out if I can do this (with tvb_get_ptr??). Everything I tried didn't work.   By using this method, if I want to read the UDP source port, I can simply access "udp_hdr->source_port".   For complex protocols, this saves me LOADS of effort using the tvb_get type access mechanisms.   Thanks in advance for any help/advice you can give