How to send integer array over udp socket in C?
13,401
You could just do as follow:
int array[100] ;
sendto(sockfd, array, sizeof(array), 0, &addr, addrlen);
To recv your array the other side (assuming you always send array of the same size):
int array[100] ;
recvfrom(sockfd, array, sizeof(array), 0, &addr, &addrlen);
As said in the comments, you have to be carefull about the architecture of the system which send / receive the packet. If you're developping an application for 'standard' computers, you should not have any problem, if you want to be sure:
- Use a fixed-size type (include
stdint.h
and useint32_t
or whatever is necessary for you. - Check for endianess in your code.
Endianess conversion:
// SENDER
int32_t array[100] = ... ;
int32_t arrayToSend[100] ;
for (int i = 0 ; i < 100 ; ++i) {
arrayToSend[i] = htonl(array[i]) ;
}
sendto(sockfd, arrayToSend, sizeof(arrayToSend), 0, &addr, addrlen);
// RECEIVER
int32_t array[100] ;
int32_t arrayReceived[100] ;
recvfrom(sockfd, arrayReceived, sizeof(arrayReceived), 0, &addr, &addrlen);
for (int i = 0 ; i < 100 ; ++i) {
array[i] = ntohl(arrayReceived[i]) ;
}
Author by
user3574984
Updated on June 04, 2022Comments
-
user3574984 almost 2 years
I have to send an int array over an udp socket. Do I have to convert it as char array or as a sequence of byte? What is the standard solution?