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‎Coding/Project/02_通讯录/AddressBook.c

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#define _CRT_SECURE_NO_WARNINGS
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#include"AddressBook.h"
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#define PRIVATE static
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PRIVATE int FindName(AddressBook* address_book, char search_name[100]) {
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for (int i = 0; i < address_book->size; i++) {
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// 找到返回数组下标
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// 注意 all_address[i] 的成员访问方式为 . 而不是 ->
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if (strcmp(address_book->all_address[i].name, search_name) == 0) {
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return i;
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}
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}
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//没有找到，返回 -1
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return -1;
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}
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// 扩容
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PRIVATE void ReallocBook(AddressBook* address_book){
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// 初始 capacity 为 1，二倍增容
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int newSize = address_book->capacity == 0 ? 1 : 2 * address_book->capacity;
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PersonInfo* newAddress = realloc(address_book->all_address, newSize * sizeof(PersonInfo));
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if (!newAddress){
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strerror(errno);
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exit(EXIT_FAILURE);
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}
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// 更新
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address_book->all_address = newAddress;
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address_book->capacity = newSize;
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}
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// 从文件读取数据到缓冲区中
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PRIVATE void LoadBook(AddressBook* address_book){
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FILE* fp = fopen("address_book.txt", "r");
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if (fp == NULL){
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strerror(errno);
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exit(EXIT_FAILURE);
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}
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// 向缓冲区读取，以为不知道文件中有多少学生信息，所以我们不能一次性读完
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// 使用 while 循环不断重复读取单个学生信息
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while (1) {
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if (address_book->size == address_book->capacity) {
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ReallocBook(address_book);
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}
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PersonInfo tmp = {0};
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int n = fread(&tmp, sizeof(PersonInfo), 1, fp);
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// 读取完成
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if (n < 1) {
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break;
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}
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// 将 tmp 放入缓冲区，并且将 size 加 1
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address_book->all_address[address_book->size++] = tmp;
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}
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printf("文件已载入！\n");
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fclose(fp);
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}
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// 保存缓冲区的数据到文件中
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PRIVATE void SaveBook(AddressBook* address_book) {
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FILE* fp = fopen("address_book.txt", "w");
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if (fp == NULL) {
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strerror(errno);
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exit(EXIT_FAILURE);
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}
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// 将缓冲区内的所有内容写入文件
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int n = fwrite(address_book->all_address, sizeof(PersonInfo), address_book->size, fp);
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if (n != address_book->size) {
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strerror(errno);
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exit(EXIT_FAILURE);
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}
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printf("文件已保存！\n");
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fclose(fp);
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}
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int Menu(void) {
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printf("\n\n\n\n\n\t\t\t\t\t\t AddressBook Management System\n");
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printf("\t\t\t\t\t\t @author：Shepard Wang \n");
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printf("\t\t\t\t\t\033[0;42m 代码详细注释以及讲解见公众号：不会编程的程序圆 \033[0m \n");
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printf("\t\t\t\t\t\t ======================\n");
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printf("\t\t\t\t\t\t *** 0.退出 ***\n");
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printf("\t\t\t\t\t\t *** 1.新增联系人 ***\n");
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printf("\t\t\t\t\t\t *** 2.删除联系人 ***\n");
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printf("\t\t\t\t\t\t *** 3.查找联系人 ***\n");
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printf("\t\t\t\t\t\t *** 4.修改联系人 ***\n");
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printf("\t\t\t\t\t\t *** 5.打印联系人 ***\n");
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printf("\t\t\t\t\t\t *** 6.清除联系人 ***\n");
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printf("\t\t\t\t\t\t *** 7.排序联系人 ***\n");
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printf("\t\t\t\t\t\t ======================\n");
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printf("请输入你的选择：");
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int choice;
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scanf("%d", &choice);
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return choice;
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}
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//初始化
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void InitBook(AddressBook* address_book) {
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address_book->size = 0;
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//尽量少用 magic number(不明含义的数字)
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address_book->all_address = NULL;
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address_book->capacity = 0;
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// 初始化好缓冲区后从文件读取数据
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LoadBook(address_book);
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}
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void AddPersonInfo(AddressBook* address_book) {
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printf("新增联系人\n");
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if (address_book->size >= address_book->capacity) {
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ReallocBook(address_book);
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}
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PersonInfo* info = &address_book->all_address[address_book->size];
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printf("请输入联系人姓名：");
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scanf("%s", info->name);
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printf("请输入联系人电话：");
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scanf("%s", info->phone);
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address_book->size++;
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system("pause");
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}
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void DelPersonInfo(AddressBook* address_book) {
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//删除的方法很多，可以根据姓名，电话，序号等等来删除，
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//这里我们就用我个人比较常用的 搜索名字的删除方法
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char search_name[100] = { 0 };
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printf("删除联系人\n");
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printf("请输入联系人姓名：");
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scanf("%s", search_name);
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int name_exist = FindName(address_book, search_name);
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//这里注意 FindName 返回值设定，要被删除的元素下标可能是 0，这种情况下会返回 0
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if (name_exist == -1) {
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printf("该联系人不存在！\n");
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system("pause");
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return;
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}
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//删除了相同姓名的第一个后，继续寻找改名字，如果找到了，重复上面的操作，如果没找到，退出循环
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//相同的姓名的情况比较复杂，在修改，查找，排序等等场景都会带来麻烦，
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//而且平时你的通讯录中难道会将两个相同姓名的人的备注写成一样的吗？
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//所以，我仅仅在删除功能中实现一种针对相同姓名的情况的设计思路，后面的其他功能默认没有重复姓名的情况。
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while (name_exist != -1) {
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//将 all_address 数组的最后一个元素赋值给要删除的元素，完成删除
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//结构体类型是可以直接赋值的
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address_book->all_address[name_exist] = address_book->all_address[address_book->size - 1];
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address_book->size--;
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// 继续寻找同名人
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name_exist = FindName(address_book, search_name);
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}
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printf("删除成功！\n");
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system("pause");
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}
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void FindPersonInfo(AddressBook* address_book) {
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char search_name[100] = { 0 };
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//搜索人的方式也很多，我们这里用搜索名字的方法
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printf("更新联系人\n");
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printf("请输入人名：");
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scanf("%s", search_name);
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for (int i = 0; i < address_book->size; i++) {
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PersonInfo* info = &address_book->all_address[i];// 创建一个 PersonInfo 类型的变量简化程序，不然下面的姓名访问就太长了
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if (strcmp(info->name, search_name) == 0) {
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printf("[%d] %s %s\n", i, info->name, info->phone);
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}
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}
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system("pause");
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}
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void ModifyPersonInfo(AddressBook* address_book) {
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char search_name[100] = { 0 };
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int isjump = 1;
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printf("修改联系人\n");
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printf("请输入联系人姓名：");
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scanf("%s", search_name);
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int name_exist = FindName(address_book, search_name);
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if (name_exist == -1) {
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printf("该联系人不存在！\n");
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system("pause");
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return;
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}
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//优化用户的体验
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printf("请输入新的姓名，输入 0 跳过：");
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scanf("%d", &isjump);
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if (isjump) {
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scanf("%s", address_book->all_address[name_exist].name);
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}
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printf("请输入新的电话，输入 0 跳过：");
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scanf("%d", &isjump);
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if (isjump) {
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scanf("%s", address_book->all_address[name_exist].phone);
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}
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printf("更新成功！\n");
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system("pause");
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}
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void PrintPersonInfo(AddressBook* address_book) {
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PersonInfo* info;
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if (address_book->size == 0) {
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printf("当前没有联系人！\n");
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system("pause");
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return;
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}
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printf("所有联系人信息如下：\n");
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for (int i = 0; i < address_book->size; i++) {
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info = &address_book->all_address[i];
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printf("[%03d]%4s %s\n", i, info->name, info->phone);
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}
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system("pause");
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}
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void ClearPersonInfo(AddressBook* address_book) {
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//清除所有信息是一种 危险的行为，我们最好让用户确认一次
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//相比你应该在自己的手机上回复过出厂设置，系统应该会让你确认不止一次！
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int is_continue = 0;
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printf("清除所有联系人，你确定吗？输入 0 继续: ");
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scanf("%d", &is_continue);
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if(is_continue == 0) {
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//将 size 置为 0 即可，不过你也可以将数组的每个元素都进行重置
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address_book->size = 0;
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printf("清除完成！\n");
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}
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printf("已取消！\n");
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system("pause");
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}
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void SortPersonInfo(AddressBook* address_book) {
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printf("排序通讯录\n");
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for (int i = 0; i < address_book->size - 1; i++) {
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for (int j = 0; j < address_book->size - 1 - i; j++) {
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PersonInfo* info = &address_book->all_address[j];
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PersonInfo* info_next = &address_book->all_address[j + 1];
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//简单的用 strcmp 进行排序，不过排序的行为感觉是“未定义”的，
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//看着有规律，但再多试试会发现很多情况并没有规律。
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//也还有很多可以排序的函数。比如：strcoll,wcsscoll,wcscmp 这些只要你能弄懂，我想你也可以用。
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//或者有其他更好的实现办法，但这并不是我们在这里的重点。
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if (strcmp(info->name, info_next->name) > 0) {
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PersonInfo tmp;
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tmp = *info;
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*info = *info_next;
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*info_next = tmp;
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}
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}
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}
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printf("排序成功！\n");
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system("pause");
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}
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void DestoryBook(AddressBook* address_book) {
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// 在要退出程序时将缓冲区内的内容写入文件中
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SaveBook(address_book);
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free(address_book->all_address);
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address_book->all_address = NULL;
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address_book->capacity = address_book->size = 0;
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}
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‎Coding/Project/02_通讯录/AddressBook.h

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#pragma once
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#include<stdio.h>
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#include<string.h>
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#include<stdlib.h>
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typedef struct PersonInfo {
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char name[100];
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char phone[100];
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}PersonInfo;
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typedef struct AddressBook {
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PersonInfo* all_address;
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int size;
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int capacity;
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}AddressBook;
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// size 的含义是：
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// 数组 all_address 下标范围在 [0,size) 内的元素是有意义的
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// [size, 200) 是我们没有用到的
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// capacity 可用的空间大小
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int Menu(void);
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void InitBook(AddressBook* address_book);
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void AddPersonInfo(AddressBook* address_book);
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void DelPersonInfo(AddressBook* address_book);
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void FindPersonInfo(AddressBook* address_book);
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void ModifyPersonInfo(AddressBook* address_book);
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void PrintPersonInfo(AddressBook* address_book);
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void ClearPersonInfo(AddressBook* address_book);
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void SortPersonInfo(AddressBook* address_book);
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void DestoryBook(AddressBook* address_book);

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