c - 如何从结构中打印一个字符

Question

有人可以告诉我们在接收数据作为结构时打印一个字符吗？这是一个例子:

...
struct rcv{
  int x1;
  float x2;
  char *x3;
}; 
rcv data_rcv;
...
if (recv(socket, &data_rcv, sizeof(data_rcv), 0) < 0)
printf("recv() failed");
...

printf("x1 = %d\n", data_rcv.x1);
printf("x2 = %f\n", data_rcv.x2); 

printf("x3 = %s\n", data_rcv.x3); // it doesn't print anything, why? 
...

假设 x3 是通过套接字传输的字符串，如下所示:

...
char *str1="data-of-app.1"

struct snd{
  int x1;
  float x2;
  char *x3;
}; 
snd data_snd;
...
data_snd.snd = str1;
...
if (send(socket, &data_snd, sizeof(data_snd), 0) < 0)
printf("send() failed");
...

感谢您的回复-

Answer 1

printf("x3 = %s\n", data_rcv.x3);

应该是

printf("x3 = %c\n", data_rcv.x3);