民国学生帽子:C语言文件操作（二）

来源：百度文库编辑：偶看新闻时间：2024/10/02 20:33:39

示例程序一：模拟dos命令copy整个程序分为三部分：头文件copy.h，实现功能文件copy.cpp，主函数文件main.cpp，具体源程序如下：copy.h程序如下：#ifndef _COPY_H_
#define _COPY_H_ #define MAX_PATH 260 enum ERR_CODE
{
    ERR_TRUE = 0,
    ERR_NO_SRC_FILE = 1,
    ERR_NO_DES_FILE = 2,
}; void help(void);
ERR_CODE copy(const char* file_src,const char* file_des);
#endif
copy.cpp程序如下：#include "copy.h"
#include using namespace std; void help(void)
{
cout<<"CopyFile Usage:\n\n\tCopyFile Source Destination";
cout<<"\n\tSource file\n\tDestination:Destination file\n";
} ERR_CODE copy(const char* file_src , const char* file_des)
{     FILE* fp_src;
    FILE* fp_des;     if((fp_src=fopen(file_src,"rb"))==NULL)
    {
      cout<<"Open Source File: "<      return ERR_NO_SRC_FILE;
    }     if((fp_des=fopen(file_des,"wb"))==NULL)
    {
      cout<<" Open Destination File:"<      return ERR_NO_DES_FILE;
    }     unsigned char buffer[MAX_PATH];
    int nRet = 0; #ifndef FEOF
    do{

      nRet = fread(buffer,sizeof(unsigned char),MAX_PATH,fp_src);
      fwrite(buffer,sizeof(unsigned char),nRet,fp_des);
    }while(nRet==MAX_PATH);
#else
    while(!feof(fp_src))
    {
        nRet=fread(buffer,sizeof(unsigned char),MAX_PATH,fp_src);
        fwrite(buffer,sizeof(unsigned char),nRet,fp_des);
    }
#endif
    fclose(fp_des);
    fclose(fp_src);     return ERR_TRUE;
}
main.cpp程序如下：#include
#include "copy.h" using namespace std; int main(int argc,char* argv[])
{
    if(argc!=3)
    {
        help();
        return 1;
    }     if(ERR_TRUE!=copy(argv[1],argv[2]))
        cout<<"Copy Error"<    else
        cout<<"Copied\t\t1 file"<示例程序二：读取如下格式的文本文件score.txt，得到每个人的分数的平均值，再写入新的文本文件aver_score.txt中读取的文本文件格式如下：Zhang=80,75,92
Wang=61,65,71
Li=59,63,70
Zhao=85,87,90
Zhou=76,77,85 整个程序分为三个文件，student.h，student.cpp，main.cpp，下面是这三个文件的源代码 student.h的源代码如下：#ifndef _STUDENT_H_
#define _STUDENT_H_ #include #define NAME_LEN 16
#define MAX_PATH 260
typedef struct tagStudentInfo
{
    char name[NAME_LEN];
    int c_score;
    int math_score;
    int db_score;
    tagStudentInfo* next;
} Student_Info; typedef enum
{
    FLAG_EQU = '=',
    FLAG_COMMA = ','
} Flat_Sign; // declare Get Default StudentInfo function
void InputStudentInfo(Student_Info** person); // declare output function
void OutputStudentInfo(Student_Info* array); // free resource
void FreeResource(Student_Info* person); #endif
student.cpp的源代码如下： #include "student.h" using namespace std; static int curr_pos = 0; static int GetIndex(const char* str, Flat_Sign flag = FLAG_COMMA)
{
    int count = 0;
    char* tmp = (char*) (str + curr_pos);

    while(*tmp)
    {
        if(*tmp++ != flag)
            count++;
        else
            break;
    }     return count;
} static int GetScore(const char* buffer)
{
    int nIndex = 0;
    char tmp[MAX_PATH] = {0};     memcpy(tmp, buffer + curr_pos, nIndex = GetIndex(buffer));
    curr_pos += (nIndex + 1);

    return atoi(tmp);
} void InputStudentInfo(Student_Info** person)
{
    FILE* fp;

    if((fp = fopen("score.txt", "rt")) == NULL)
    {
        cout << "Open File Error" << endl;
        return;
    }     Student_Info* info_list = new Student_Info;
    Student_Info* pre_list;     *person = info_list;
    char buffer[MAX_PATH];
    int nIndex = 0;

    while(!feof(fp))
    {
        memset(info_list, 0, sizeof(Student_Info));
        memset(buffer, 0, sizeof(buffer));
        fgets(buffer, MAX_PATH, fp);         memcpy(info_list->name, buffer, nIndex = GetIndex(buffer, FLAG_EQU));
        curr_pos += (nIndex + 1);

        info_list->c_score    = GetScore(buffer);
        info_list->math_score = GetScore(buffer);
        info_list->db_score   = GetScore(buffer);         pre_list = info_list;
        info_list->next = new Student_Info;
        info_list = info_list->next;         curr_pos = 0;
    }     fclose(fp);     delete info_list;
    pre_list->next = NULL;
}    void OutputStudentInfo(Student_Info* person)
{
    FILE* fp;

    if((fp = fopen("aver_score.txt", "wt")) == NULL)
    {
        cout << "Open File Error" << endl;
        return ;
    }     fprintf(fp, "Name = Aver_Score\n");     Student_Info* list = person;

    do {
        fprintf(fp, "%s = %d\n",
                     list->name,
                     (list->c_score + list->math_score + list->db_score) / 3);
        list = list->next;
    } while(list);     fclose(fp);
} void FreeResource(Student_Info* person)
{
    Student_Info* list = person;
    Student_Info* temp_list;

    do {
        temp_list = list->next;
        delete list;
        list = temp_list;
    } while (list);
}
main.cpp的源代码如下：#include "student.h" /*
*    This is Main program for Score management
*/ int main(int argc, char** argv)
{
    Student_Info* person = NULL;     //Get all the student score from file
    InputStudentInfo(&person);     //Output student score into file
    OutputStudentInfo(person);     //free memory resource
    FreeResource(person); // getchar();
    return 0;
}
最后生成的结果文件如下图：Name = Aver_Score
Zhang=82
Wang=65
Li=64
Zhao=87
Zhou=79 本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/liyebing/archive/2008/12/07/3466440.aspx

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