Socket Datagram info sendto(), recvfrom()

Hi, i'm new , and i like so much this forum!
i've a question about socket datagram, can i send a struct directli with the function sendto (..) ? or I have only the possibility to send vector of char ??
i need to send a frame with Data , Cecksum, and number of packet, using Datagram UDP . . .

You can send any contiguous block of memory you like (up to around 1500 bytes).

But watch out for endian and alignment issues - different machines will interpret the data differently unless you're careful.