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| #include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
typedef struct {
int year, month, day;
int hour, minute, second;
} DateTime;
typedef struct {
int id;
char name[100];
char email[100];
DateTime created_at;
DateTime last_login;
float balance;
int transaction_count;
bool is_active;
} UserAccount;
typedef struct {
char signature[8];
int version;
int record_count;
DateTime created_at;
char description[64];
} FileHeader;
DateTime get_current_time(void) {
time_t now = time(NULL);
struct tm* tm_info = localtime(&now);
DateTime dt = {
.year = tm_info->tm_year + 1900,
.month = tm_info->tm_mon + 1,
.day = tm_info->tm_mday,
.hour = tm_info->tm_hour,
.minute = tm_info->tm_min,
.second = tm_info->tm_sec
};
return dt;
}
bool save_user_accounts(const char* filename, UserAccount accounts[], int count) {
FILE* file = fopen(filename, "wb");
if (file == NULL) {
printf("无法创建文件: %s\n", filename);
return false;
}
FileHeader header = {
.signature = "USRDATA",
.version = 1,
.record_count = count,
.created_at = get_current_time()
};
strcpy(header.description, "User Account Database");
if (fwrite(&header, sizeof(FileHeader), 1, file) != 1) {
printf("写入文件头失败\n");
fclose(file);
return false;
}
if (fwrite(accounts, sizeof(UserAccount), count, file) != count) {
printf("写入用户数据失败\n");
fclose(file);
return false;
}
fclose(file);
printf("成功保存 %d 个用户账户到 %s\n", count, filename);
return true;
}
UserAccount* load_user_accounts(const char* filename, int* count) {
FILE* file = fopen(filename, "rb");
if (file == NULL) {
printf("无法打开文件: %s\n", filename);
return NULL;
}
FileHeader header;
if (fread(&header, sizeof(FileHeader), 1, file) != 1) {
printf("读取文件头失败\n");
fclose(file);
return NULL;
}
if (strcmp(header.signature, "USRDATA") != 0) {
printf("无效的文件格式\n");
fclose(file);
return NULL;
}
printf("文件信息:\n");
printf(" 签名: %s\n", header.signature);
printf(" 版本: %d\n", header.version);
printf(" 记录数: %d\n", header.record_count);
printf(" 创建时间: %d-%02d-%02d %02d:%02d:%02d\n",
header.created_at.year, header.created_at.month, header.created_at.day,
header.created_at.hour, header.created_at.minute, header.created_at.second);
printf(" 描述: %s\n", header.description);
UserAccount* accounts = malloc(header.record_count * sizeof(UserAccount));
if (accounts == NULL) {
printf("内存分配失败\n");
fclose(file);
return NULL;
}
if (fread(accounts, sizeof(UserAccount), header.record_count, file) != header.record_count) {
printf("读取用户数据失败\n");
free(accounts);
fclose(file);
return NULL;
}
fclose(file);
*count = header.record_count;
printf("成功加载 %d 个用户账户\n", *count);
return accounts;
}
void print_user_account(const UserAccount* account) {
printf("用户账户:\n");
printf(" ID: %d\n", account->id);
printf(" 姓名: %s\n", account->name);
printf(" 邮箱: %s\n", account->email);
printf(" 余额: %.2f\n", account->balance);
printf(" 交易次数: %d\n", account->transaction_count);
printf(" 状态: %s\n", account->is_active ? "活跃" : "非活跃");
printf(" 创建时间: %d-%02d-%02d %02d:%02d:%02d\n",
account->created_at.year, account->created_at.month, account->created_at.day,
account->created_at.hour, account->created_at.minute, account->created_at.second);
printf(" 最后登录: %d-%02d-%02d %02d:%02d:%02d\n",
account->last_login.year, account->last_login.month, account->last_login.day,
account->last_login.hour, account->last_login.minute, account->last_login.second);
printf("\n");
}
void demonstrate_binary_serialization(void) {
printf("=== 二进制序列化演示 ===\n");
UserAccount accounts[] = {
{
.id = 1001,
.name = "张三",
.email = "zhangsan@example.com",
.created_at = {2023, 1, 15, 10, 30, 0},
.last_login = {2024, 8, 10, 14, 25, 30},
.balance = 1250.75f,
.transaction_count = 45,
.is_active = true
},
{
.id = 1002,
.name = "李四",
.email = "lisi@example.com",
.created_at = {2023, 3, 22, 16, 45, 0},
.last_login = {2024, 8, 9, 9, 15, 20},
.balance = 890.50f,
.transaction_count = 23,
.is_active = true
},
{
.id = 1003,
.name = "王五",
.email = "wangwu@example.com",
.created_at = {2023, 6, 8, 11, 20, 0},
.last_login = {2024, 7, 28, 20, 10, 45},
.balance = 0.00f,
.transaction_count = 12,
.is_active = false
}
};
int account_count = sizeof(accounts) / sizeof(accounts[0]);
const char* filename = "user_accounts.dat";
if (save_user_accounts(filename, accounts, account_count)) {
int loaded_count;
UserAccount* loaded_accounts = load_user_accounts(filename, &loaded_count);
if (loaded_accounts != NULL) {
printf("\n加载的用户账户:\n");
for (int i = 0; i < loaded_count; i++) {
printf("--- 用户 %d ---\n", i + 1);
print_user_account(&loaded_accounts[i]);
}
free(loaded_accounts);
}
}
remove(filename);
}
int main(void) {
demonstrate_binary_serialization();
return 0;
}
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