le type du membre "data" de la structure "UDPpacket"

Ci-dessous il y a le code source qui fonctionne pour une chaine de caractères.
Maintenant, ce que je veux c'est envoyer une structure à la place de la chaine de caractères.

Par exemple, on peut prendre cette structure :
data.h :

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typedef struct data
{
	int integer;
	char str[6];
} data_t;

Finalement, j'ai trouvé comment caster correctement :

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data_t data;
strcpy(data.str, "Hello\0");
data.integer = 123;
packet->data = (Uint8*)&data;
packet->len = sizeof(data);

Les données sont correctement envoyées et reçues entre le serveur et le client.

Problème résolu.

server.c:

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#include <stdio.h> /* for printf */
#include <stdlib.h> /* for exit */
#include <SDL/SDL.h> /* for SDL_Init */
#include <SDL/SDL_net.h> /* for SDLNet_Init */
#include <unistd.h> /* for sleep */
int main()
{
	// Initialize
	if(SDL_Init(0) == -1)
	{
		printf("SDL_Init: %s\n", SDL_GetError());
		exit(EXIT_FAILURE);
	}
	if(SDLNet_Init() == -1) {
		printf("SDLNet_Init: %s\n", SDLNet_GetError());
		exit(EXIT_FAILURE);
	}
	// Create the socket
	UDPsocket udpsock = NULL;
	udpsock = SDLNet_UDP_Open(6666);
	if(udpsock == NULL)
	{
		printf("SDLNet_UDP_Open: %s\n", SDLNet_GetError());
		exit(EXIT_FAILURE);
	}
	// Create the packet
	UDPpacket *packet = NULL;
	packet = SDLNet_AllocPacket(1024);
	if(packet == NULL)
	{
		printf("SDLNet_AllocPacket: %s\n", SDLNet_GetError());
		exit(EXIT_FAILURE);
	}
	// Receive the packet
	int numrecv;
	while(1)
	{
		numrecv = SDLNet_UDP_Recv(udpsock, packet);
		printf("numrecv = %d (packet->data = \"%s\")\n", numrecv, (char *) packet->data);
		sleep(1);
	}
	SDLNet_FreePacket(packet);
	SDLNet_Quit();
	SDL_Quit();
	exit(EXIT_SUCCESS);
}

client.c:

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#include <stdio.h> /* for printf */
#include <stdlib.h> /* for exit */
#include <SDL/SDL.h> /* for SDL_Init */
#include <SDL/SDL_net.h> /* for SDLNet_Init */
#include <unistd.h> /* for sleep */
int main()
{
	char data[6] = "Hello\0";
	// Initialize
	if(SDL_Init(0) == -1)
	{
		printf("SDL_Init: %s\n", SDL_GetError());
		exit(EXIT_FAILURE);
	}
	if(SDLNet_Init() == -1) {
		printf("SDLNet_Init: %s\n", SDLNet_GetError());
		exit(EXIT_FAILURE);
	}
	// Create the socket
	UDPsocket udpsock;
	udpsock = SDLNet_UDP_Open(0);
	if(!udpsock)
	{
		printf("SDLNet_UDP_Open: %s\n", SDLNet_GetError());
		exit(1);
	}
	// Resolve host
	IPaddress ipaddress;
	if(SDLNet_ResolveHost(&ipaddress, "localhost", 6666) == -1)
	{
		printf("SDLNet_ResolveHost: %s\n", SDLNet_GetError());
		exit(EXIT_FAILURE);
	}
	// Create the packet
	UDPpacket *packet = NULL;
	packet = SDLNet_AllocPacket(1024);
	if(packet == NULL)
	{
		printf("SDLNet_AllocPacket: %s\n", SDLNet_GetError());
		exit(EXIT_FAILURE);
	}
	packet->data = data;
	packet->len = 6;
	packet->address = ipaddress;
	// Send the packet
	int numsent;
	while(1)
	{
		numsent = SDLNet_UDP_Send(udpsock, packet->channel, packet);
		printf("numsent = %d (packet->data = \"%s\")\n", numsent, (char *)packet->data);
		sleep(1);
	}
	SDLNet_FreePacket(packet);
	SDLNet_Quit();
	SDL_Quit();
	exit(EXIT_SUCCESS);
}