In vb multicast sending and receiving data, using the recvfrom (msg_sock, byval retmsg, 1000, 0, from_addr, fromlen) function, can receive the string data, I want to receives the hexadecimal byte an array of types, don't know why I did not receive the data? Receive a string, defined retmsg string type, receive hexadecimal byte array is to define the retmsg for byte type