protobuf c语言使用样例

以下是使用Protobuf在C语言中进行序列化和反序列化的示例：

1. 序列化示例：

#include <stdio.h>
#include <stdlib.h>
#include "amessage.pb-c.h"

int main() {
    AMessage message = AMESSAGE__INIT;
    void *buf;
    unsigned len;

    // 设置消息字段的值
    message.id = 1;    message.name = "John Doe";
    message.email = "johndoe@example.com";

    // 序列化消息
    len = amessage__get_packed_size(&message);
    buf = malloc(len);
    amessage__pack(&message, buf);

    // 打印序列化后的数据
    for (unsigned i = 0; i < len; i++) {
        printf("%02x ", ((uint8_t *)buf)[i]);
    }
    printf("\n");

    // 释放内存
    free(buf);

    return 0;
}

2. 反序列化示例：

#include <stdio.h>
#include <stdlib.h>
#include "amessage.pb-c.h"

int main() {
    AMessage *message;
    void *buf;
    unsigned len;

    // 假设这是从网络或文件中接收到的序列化数据
    uint8_t serialized_data[] = {0x08, 0x01, 0x12, 0x08, 0x4a, 0x6f, 0x68, 0x6e, 0x20, 0x44, 0x6f, 0x65, 0x1a, 0x12, 0x6a, 0x6f, 0x68, 0x6e, 0x64, 0x6f, 0x65, 0x40, 0x65, 0x78, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x2e, 0x63, 0x6f, 0x6d};

    // 反序列化消息
    len = sizeof(serialized_data);
    buf = malloc(len);
    memcpy(buf, serialized_data, len);
    message = amessage__unpack(NULL, len, buf);

    // 打印消息字段的值
    printf("ID: %d\n", message->id);
    printf("Name: %s\n", message->name);
    printf("Email: %s\n", message->email);

    // 释放内存
    amessage__free_unpacked(message, NULL);
    free(buf);

    return 0;
}