struct data
{
    u_short sin_port;
    struct  in_addr sin_addr;
    unsigned char id;
};

struct data Data[141];

char *buf,*buf1,
buf1 = (char *)malloc(10000);
memset(buf1, 0, 10000);

for (i =0;i< 141;i++)
 {
        memcpy(buf1, &Data[i].id,20);
        printf("buf11: %x\n", buf1);
        buf1+=20;
        memcpy(buf1, &Data[i].sin_addr, 4);
        buf1+=4;
        memcpy(buf1, &Data[i].sin_port, 2);
        buf1+=2;
        size1 += 26;
 }
 buf1 -= size1;
   
write(fd2, buf1, size1+1);
close(fd2);
free(buf1);

我发现这样写入的数据总是不对/？请教哪里有问题啊？一般都是先写入buffer,再写入文件？