[学习记录]接口的封装与设计之文件读写

#include <iostream>

using namespace std;

#define  StructArrarySize 5              // 老师数量                         
#define  StudentNum 3                    // 每位老师的学生的数量            
#define  FileName "f:/1.txt"             // 文件路径和名称                   
#define  LineMaxLen 1024                 // 每行最大长读
#define  KeyMaxLen 20                    // key的最大长度

typedef struct _AdvTeacher
{
    char    *name;
    char    *tile;
    int        age;
    char    *addr;
    char    **student;
}AdvTeacher;
   
int CreateStructArray(AdvTeacher **, int, int);                                    //客户端初始化结构体数组
int FreeStructArray(AdvTeacher **, int, int);                                      //客户端释放结构体数组内存
int StructWriteFile(const char *, const AdvTeacher *, int, int);                   //结构体写入文件
int StructFileRead(char *pFileName, char *pKey, char *pValue, int *pValueLen);     //读取结构体文件
void ReadFileMenu(void);                                                           //读取文件菜单

int main(void)
{
    int rv = 0;

    AdvTeacher * t = NULL;

    rv = CreateStructArray(&t, StructArrarySize, StudentNum);    //被调函数分配内存
    if (rv != 0)
    {
        printf("func: CreateStructArray() _%d_error_
 ", rv);
        goto End;
    }

    for (int i = 0; i < StructArrarySize; ++i)                   // 客户端初始化赋值
    {
        printf("请输入第%d位老师的姓名: ", i+1);
        scanf("%s", t[i].name);
        printf("请输入第%d位老师的年龄: ", i+1);
        scanf("%d", &(t[i].age));
        printf("请输入第%d位老师的职务: ", i+1);
        scanf("%s", t[i].tile);
        printf("请输入第%d位老师的地址: ", i+1);
        scanf("%s", t[i].addr);
        for (int j = 0; j < StudentNum; ++j)
        {
            printf("请输入第%d位老师的第%d位学生的姓名: ", i+1, j+1);
            scanf("%s", t[i].student[j]);
        }
    }

    char * fileName = FileName;

    rv = StructWriteFile(fileName, t, StructArrarySize, StudentNum);     // 结构体写入文件 
    if (rv != 0)
    {
        printf("func: StructWriteFile() _%d_error_
 ", rv);
        goto End;
    }

    ReadFileMenu();                                                      //读取结构体文件

End:
    rv = FreeStructArray(&t, StructArrarySize, StudentNum);
    if (rv != 0)
    {
        printf("致命错误: FreeStructArray()执行失败！
 _%d_error_
", rv);
    }
    system("pause");
    return rv;
}

// 创建结构体数组
int CreateStructArray(AdvTeacher **t, int structArrarySize, int studentNum)
{
    int rv = 0;
    if (NULL == t)
    {
        rv = -1;
        return rv;
    }

    AdvTeacher * temp = NULL;

    temp = (AdvTeacher *)malloc(structArrarySize * sizeof(AdvTeacher));
    if (NULL == temp)
    {
        rv = -2;
        return rv;
    }

    for (int i = 0; i < structArrarySize; ++i)
    {
        temp[i].name = (char *)malloc(256 * sizeof(char));
        temp[i].addr = (char *)malloc(256 * sizeof(char));
        temp[i].tile = (char *)malloc(256 * sizeof(char));

        if (NULL == temp[i].name || NULL ==temp[i].addr || NULL == temp[i].tile)
        {
            rv = -3;
            return rv;
        }

        temp[i].student = (char **)malloc(studentNum * sizeof(char *));
        if (NULL == temp[i].student)
        {
            rv = -4;
            return rv;
        }
        for (int j = 0; j < studentNum; ++j)                                  //创建学生内存块
        {
            (temp[i].student)[j] = (char *)malloc(256 * sizeof(char));
            if (NULL == (temp->student)[j])
            {
                rv = -5;
                return rv;
            }
        }
    }

    *t = temp;

    return rv;
}

// 销毁结构体数组
int FreeStructArray(AdvTeacher **t, int structArrarySize, int studentNum)
{
    int rv = 0;
    AdvTeacher *temp = *t;

    for (int i = 0; i < structArrarySize; ++i)
    {
        for (int j = 0; j < studentNum; ++j)                               // 销毁学生内存块
        {
            if (NULL != temp[i].student[j])
            {
                free(temp[i].student[j]);
            }
        }

        if (NULL != temp[i].addr && NULL != temp[i].name && NULL != temp[i].tile && NULL != temp[i].student)
        {
            free(temp[i].addr);
            free(temp[i].name);
            free(temp[i].tile);
            free(temp[i].student);
        }
    }

    if (NULL != temp)
    {
        free(temp);
        *t = NULL; //间接赋值  通过*(实参的地址)， 去间接修改实参的值 为null
    }

    return rv;
}

// 结构体文件写入
int StructWriteFile(const char *fileName, const AdvTeacher *t, int structArrarySize, int studentNum)
{
    int rv = 0;
    if (NULL == fileName || NULL == t)
    {
        rv = -1;
        return rv;
    }

    FILE *fp = NULL;

    fp = fopen(fileName, "w+");
    if (NULL == fp)
    {
        printf("func: StructWriteFile() _文件打开失败_
");
        goto End;
    }

    char buf[1024];

    for (int i = 0; i < structArrarySize; ++i)
    {
        sprintf(buf, "name%d = %s
", i + 1, t[i].name);
        fputs(buf, fp);
        sprintf(buf, "age%d  = %d
", i + 1, t[i].age);
        fputs(buf, fp);
        sprintf(buf, "tile%d = %s
", i + 1, t[i].tile);
        fputs(buf, fp);
        sprintf(buf, "addr%d = %s
", i + 1, t[i].addr);
        fputs(buf, fp);

        for (int j = 0; j < studentNum; ++j)
        {
            sprintf(buf, "%dstudentname%d = %s
",i+1, j +1, t[i].student[j]);     //第几个老师的第几个学生
            fputs(buf, fp);
        }
    }

End:
    if (NULL != fp)
    {
        fclose(fp);
    }
    return rv;
}

// 结构体文件读出
int StructFileRead(char *pFileName, char *pKey, char *pValue, int *pValueLen)
{
    int        rv = 0;
    FILE    *fp = NULL;
    char    lineBuf[LineMaxLen];
    char    *pTmp = NULL, *pBegin = NULL, *pEnd = NULL;

    if (pFileName==NULL || pKey==NULL || pValue==NULL || pValueLen==NULL) 
    {
        rv = -1;
        printf("StructFileRead() err. param err 
");
        goto End;
    }

    fp = fopen(pFileName, "r");
    if (fp == NULL)
    {
        rv = -2;
        printf("fopen() err. 
");
        goto End;
    }
    while (!feof(fp))
    {
        //读每一行
        memset(lineBuf, 0, sizeof(lineBuf));
        pTmp = fgets(lineBuf, LineMaxLen, fp);
        if (pTmp == NULL) 
        {
            break;
        }

        //不含=, 非配置项
        pTmp = strchr(lineBuf, '=');
        if (pTmp == NULL)
        {
            continue;
        }
        //key是否在本行
        pTmp = strstr(lineBuf, pKey);
        if (pTmp == NULL)
        {
            continue;
        }

        //调整到=右边，取value准备
        pTmp = strchr(lineBuf, '=');
        if (pTmp == NULL)
        {
            continue;
        }
        pTmp = pTmp + 1;

        //获取value 起点
        while (true) 
        {
            if (*pTmp == ' ')
            {
                pTmp ++ ;
            } 
            else
            {
                pBegin = pTmp;
                if (*pBegin == '
')
                {
                    //没有配置value
                    printf("配置项:%s 没有配置value 
", pKey);
                    goto End;
                }
                break;
            }
        }

        //获取valude结束点
        while (true) 
        {
            if ((*pTmp == ' ' || *pTmp == '
'))
            {
                break;
            }
            else 
            {
                pTmp ++;
            }
        }
        pEnd = pTmp;

        //赋值
        *pValueLen = pEnd-pBegin;
        memcpy(pValue, pBegin, pEnd-pBegin);
        pValue[pEnd - pBegin] = '';
        break;
    }

End:
    if (fp != NULL)
    {
        fclose(fp); 
    }

    return rv;
}

// 文件读出菜单
void ReadFileMenu(void)
{
    char    pKey[256];
    char    pValue[1024];             
    int        pValueLen = 0;
    int        rv = 0;
    
    while (true)
    {
        strcpy(pValue, "不存在匹配项");
        system("cls");
        printf("	********************读取文件菜单************************
");
        printf("	格式：如第一个老师的姓名: name1
");
        printf("	格式：如第一个老师的第二个学生的姓名: 1studentname2
");
        printf("	退出请输入: quit 

");
        printf("	********************读取文件菜单************************
");
        printf("	
");
        printf("	请输入需要读取数据： ");

        scanf("%s", pKey);
        if (strlen(pKey) < 4)
        {
            printf("	非法输入!请重新输入
");
            system("pause");
            continue;
        }
        if (0 == strcmp("quit", pKey))
        {
            break;
        }

        rv = StructFileRead(FileName, pKey, pValue, &pValueLen);
        if (0 != rv)
        {
            rv = -1;
            printf("func: StructFileRead() _%d_error_
", rv);
            return;
        }
    
        printf("
	%s = %s

", pKey, pValue);
        printf("	请按任意键继续!
");
        strcpy(pValue, "不存在匹配项");               //覆盖上一次pValue的值,这样就可以避免下次如果没有找到pValue,这次的值不会残留到下一个pValue
        system("pause");
        
    }

    return;
}

复制去Google翻译翻译结果