C语言文件的存储

来源：互联网发布：java调用函数编辑：程序博客网时间：2024/06/08 03:25

综合练习-通讯录管理系统，实现：

1、添加联系人信息

2、按照姓名查找联系人

3、按照姓名删除联系人

4、打印所有联系人信息

5、扩展：使用文件将通讯录信息保存，下次启动时加载数据

使用二进制方式写入文件 C 语言代码如下

#include <stdio.h>#include <string.h>#include <stdlib.h>FILE * g_pAddressListFile;struct PersonInfo {    char name[8];    char phoneNumber[13];    char address[20];};void InitFile() {    g_pAddressListFile = fopen("AddressList.txt","a+");    if(g_pAddressListFile == NULL) {        printf("Can't open the file!\n");        exit(1);    }}void ColseFile() {    fclose(g_pAddressListFile);}struct PersonInfo MakePersonInfo(char name[8], char phoneNumber[13], char address[20]) {    struct PersonInfo info;    strcpy(info.name, name);    strcpy(info.phoneNumber, phoneNumber);    strcpy(info.address, address);    return info;}void AddRecord(struct PersonInfo * info) {    fseek(g_pAddressListFile, 0, SEEK_END);    fwrite(info, sizeof(struct PersonInfo), 1, g_pAddressListFile);}void ClearAllRecord() {    g_pAddressListFile = fopen("AddressList.txt","w+");    if(g_pAddressListFile == NULL) {        printf("Can't open the file!\n");        exit(1);    }}void DeleteInfoByName(char name[8]) {    fseek(g_pAddressListFile, 0, SEEK_SET);    fseek(g_pAddressListFile, 0, SEEK_END);    long fileSize = ftell(g_pAddressListFile);    struct PersonInfo * arr = (struct PersonInfo*)malloc(fileSize - 1);        struct PersonInfo info;    int n=0;    fseek(g_pAddressListFile, 0, SEEK_SET);    while(fread(&info, sizeof(struct PersonInfo), 1, g_pAddressListFile) != 0) {        if(strcmp(info.name, name) != 0) arr[n++] = info;    }    ClearAllRecord();    for(int i=0; i<n; i++){        AddRecord(&arr[i]);    }    }struct PersonInfo FindRecordByName(char name[8]) {    FILE * pos = g_pAddressListFile;    fseek(pos, 0, SEEK_SET);    struct PersonInfo info;    while (fread(&info, sizeof(struct PersonInfo), 1, pos) != 0) {        if(strcmp(info.name, name) == 0)            return info;    }    strcpy(info.name, name);    strcpy(info.phoneNumber, "");    strcpy(info.address, "");    return info;}void PrintAddressList() {    fseek(g_pAddressListFile, 0, SEEK_SET);    struct PersonInfo info;    while(fread(&info, sizeof(struct PersonInfo), 1, g_pAddressListFile) != 0) {        printf("姓名：%s\n电话号码：%s\n住址：%s\n\n", info.name, info.phoneNumber, info.address);    }}// resize rename removeint main(int argc, const char * argv[]) {    InitFile();        ClearAllRecord();    struct PersonInfo jone = MakePersonInfo("jone", "119", "heaven");    AddRecord(&jone);    struct PersonInfo tom = MakePersonInfo("tom", "120", "hell");    AddRecord(&tom);    DeleteInfoByName("tom");    PrintAddressList();    jone = FindRecordByName("jone");    printf("find 姓名：%s\n电话号码：%s\n住址：%s\n\n", jone.name, jone.phoneNumber, jone.address);        ColseFile();    return 0;}

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