C如何将结构数组序列化为char数组？

Question

这段代码将结构序列化为字符数组，我可以通过套接字发送它并反序列化回来。

如何修改此代码以使用结构数组

server_message[n].response =  strdup("RESPONSE");
server_message[n].command = strdup("COMMAND");
server_message[n].data = strdup("DATA");

序列化为字符数组 -

char reply[1024];

通过套接字发送并反序列化回来？

#include <string.h>


typedef struct __attribute__((__packed__)) arch_sm
{
    char* response;
    char* command;
    char* data;
} request_struct_sm;
size_t serialize(const request_struct_sm* arch_sm, char* buf)
{
    size_t bytes = 0;
    memcpy(buf + bytes, arch_sm->response, strlen(arch_sm->response) + 1);
    bytes += strlen(arch_sm->response) + 1;
    memcpy(buf + bytes, arch_sm->command, strlen(arch_sm->command) + 1);
    bytes += strlen(arch_sm->command) + 1;
    memcpy(buf + bytes, arch_sm->data, strlen(arch_sm->data) + 1);
    bytes += strlen(arch_sm->data) + 1;
    return bytes;
}

void deserialize_server(const char* buf, request_struct_sm* arch_sm)
{
    size_t offset = 0;
    arch_sm->response = strdup(buf + offset);
    offset += strlen(buf + offset) + 1;
    arch_sm->command = strdup(buf + offset);
    offset += strlen(buf + offset) + 1;
    arch_sm->data = strdup(buf + offset);
}

int main(){
    request_struct_sm server_message;
    request_struct_sm client_message;
    server_message.response =  strdup("RESPONSE");
    server_message.command = strdup("COMMAND");
    server_message.data = strdup("DATA");

  // server_message[0].response =  strdup("RESPONSE"); //Need to be able use array of structure
  //  server_message[0].command = strdup("COMMAND");
  //  server_message[0].data = strdup("DATA");

    char reply[1024] = {0};
    size_t bufLen = serialize(&server_message, reply);
    deserialize_server(reply, &client_message);
    printf("client_message.response = %s\n"
            "client_message.command = %s\n"
            "client_message.data = %s\n",
            client_message.response, client_message.command, client_message.data);
    return 0;

}

Answer 1

你基本上只有两个选择，而且两者都非常相似:

1. 循环数组中的所有结构，序列化当前结构，发送给对等体。要知道数组的开头和结尾，要么首先发送条目数，要么使用特殊的结构结束标记。

2. 开始与之前的方式相同，但不是逐一发送每个(序列化)结构，而是将每个(序列化)结构附加到一个非常大的数组中，该数组足够大以适合所有结构。然后发送整个数组。同样，您需要某种方式来发送长度或数据结束标记。