将数字序列化到内存

void test_memcpy() {
  uint32 a = 1235439534;
  char buf[1024];
  memset(buf, 0 , sizeof(buf));
  memcpy(buf, &a, sizeof(a));
  cout << buf << endl;
  uint32 b = 0;
  memcpy(&b, buf, sizeof(b));
  cout << b << endl;
}