Question

I have a client and a server. I use UDP. (C/Unix)

In server I do have a structure:

typedef struct Header {
int seqid;
int len;
char payload[100];
}
...
char test[100];
struct Header package;
package.seqid = 1;
package.len = 64;
strcpy(package.payload, test);
sendto(sockfd, &package, 100, 0, (struct sockaddr*)&cliaddr, sizeof(cliaddr));

In client I do have the same structure:

struct Header* myrepos;
...
recvfrom(sockfd, recvline, 100, 0, NULL, NULL);
//recvline is a char[100]
...

I want to load into the “myrepos” the submitted structure (submitted by server).
How can I do that?

Using a

*angel = (struct Header*)&recvline;

result in compiler errors.

I am not sure if my methid is quite right or it can happen.
Are there other solutions?

Thank You!

Answer 1

If you want to send fixed size packages. Then this could be the solution:

Server:

sendto(sockfd, &package, sizeof(package), 0, 
       (struct sockaddr*)&cliaddr, sizeof(cliaddr));

Client:

struct Header myrepos;
...
recvfrom(sockfd, &myrepos, sizeof(myrepos), 0, NULL, NULL);

Of cource you must check return codes of functions.

If you want to send variable sized packages, it would be more complex.