[.. upper level ..]

vg4->nw->put_zdata()

Put additional-data to be sent along with input-events to the network-server.

/* send additional-data when space-key is pressed, print retrieved additional-data to stdout */

struct VG_NwZdata nw_zdata;
VG_BOOL dowait;
int clnr;
int key_zdata;

/* set space-key as local key to send additional-data */
if ((key_zdata = vg4->input->key_insert("Send additional-data", VG_FALSE, VG_FALSE)) == 0) { VG_dest(); exit(1); }
vg4->input->key_setkbd(key_zdata, VG_INPUT_KBDCODE_SPACE);

/* clnr shall be client-number of local client */

for (;;) {
  if (!vg4->nw->update(&dowait, &nw_zdata)) { VG_dest(); exit(1); }
  if (!vg4->nw->is_connected(clnr)) { VG_dest(); exit(0); }

  /* player pressed key to send additional-data? */
  if (vg4->input->key_newpressed(key_zdata)) {
    struct VG_NwZdata zdata_put;
    snprintf(zdata_put.data, sizeof(zdata_put.data), "Hello, i am client %d", clnr);
    zdata_put.size = strlen(zdata_put.data) + 1;  /* set string null-terminated */
    vg4->nw->put_zdata(&zdata_put);
  }

  /* check for additional-data in nw_zdata */
  if (nw_zdata.size > 0) {
    printf("From client %d: %s\n", nw_zdata.clnr, nw_zdata.data);  /* data is null-terminated */
  }

  if (dowait) { vg4->misc->wait_time(50); }
}