Description
Called when a contact on your contacts list comes online.

Example

bone_setcallback(BONE_CALLBACK_CONTACTISONLINE, callback_contactisonline);

void callback_contactisonline(BONEHANDLE bhnd, const char *contact, int onlinestatus)
{
    switch(onlinestatus)
    {
    case BONE_API_ISONLINE_USERPRESENT:  printf("%s is online.\n", contact);  break;
    case BONE_API_ISONLINE_NOTPRESENT:  printf("%s is offline.\n", contact);  break;
    case BONE_API_ISONLINE_ADMINPRESENT:  printf("Administrator %s is online.\n", contact);  break;
    }
}