记录向 C语言中的文件操作函数

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
#define PATH "./file.txt"



void fileWrite(void)
{
    FILE* fp = fopen(PATH,"w");
    if(fp == NULL)
    {
        perror("file open failed");
        return;
    }


    char str[] = "人生若只如初见,何事秋风悲画扇。A";
    int i = 0;
    char ch;
    for(i=0;i<strlen(str);i++)
    {
        ch = fputc(str[i],fp);
        printf("%c",ch);
    }

    fclose(fp);
}

void fileRead(void)
{
    FILE* fp = fopen(PATH,"r");
    if(fp == NULL)
    {
        perror("file open failed");
        return;
    }

    char ch;
    while(!feof(fp))
    {
        ch = fgetc(fp);
        printf("%c",ch);
    }

    fclose(fp);
}

void fileReadWrite(void)
{
    FILE* fp = fopen(PATH,"w+");
    if(fp == NULL)
    {
        perror("file open failed");
        return;
    }
    //先写文件
    char str[] = "You are being watched. The government has a secret system, the machine that spies on you every hour of every day.";
    int temp = fputs(str,fp);
    printf("fputs return:%d\n",temp);

    //把文件位置指针移动到文件的开头
    rewind(fp);

    //读取文件
    char re_buff[128] = {0};
    char *re_temp = fgets(re_buff,sizeof(re_buff),fp);
    printf("re_temp:%s    re_buf:%s\n",re_temp,re_buff);


    fclose(fp);
}

//格式化读写
void fileFormatReadWrite(void)
{
    FILE* fp = fopen(PATH,"w+");
    if(fp == NULL)
    {
        perror("file open failed");
        return;
    }

    //写,搭配循环使用
    //fprintf(fp, "%d %s %s %s\n",id,account,password,name);

    //回到开头
    rewind(fp);

    //读
    while(!feof(fp))
    {
        //fscanf(fp,"%s %d %c",val_1,val_2,val_3);
    }

    fclose(fp);
}

void fileCpoy(void)
{

}

void str_test(void)
{
    puts(strchr("../files/file.txt",'/'));
    puts(strrchr("../files/file.txt",'/'));
}

int main(int argc,char* argv[])
{
    //fileWrite();
    //fileRead();
    //fileReadWrite();
    str_test();
    return 0;
}

/*
 *                 input
 *
 *      int fputc(int c, FILE *stream);
 *      int fputs(const char *s, FILE *stream);
 *      int putc(int c, FILE *stream);
 *      int putchar(int c);
 *      int puts(const char *s); 
 * 
 * 
 *                output
 * 
 *      int fgetc(FILE *stream);
 *      char *fgets(char *s, int size, FILE *stream);
 *      int getc(FILE *stream);
 *      int getchar(void);
 *      int ungetc(int c, FILE *stream);
 *
 *  
 */
/***********************************************
#include <stdio.h>

int printf(const char *format, ...);
int fprintf(FILE *stream, const char *format, ...);
int dprintf(int fd, const char *format, ...);
int sprintf(char *str, const char *format, ...);
int snprintf(char *str, size_t size, const char *format, ...);

#include <stdarg.h>

int vprintf(const char *format, va_list ap);
int vfprintf(FILE *stream, const char *format, va_list ap);
int vdprintf(int fd, const char *format, va_list ap);
int vsprintf(char *str, const char *format, va_list ap);
int vsnprintf(char *str, size_t size, const char *format, va_list ap);

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/************************************************

#include <stdio.h>

int scanf(const char *format, ...);
int fscanf(FILE *stream, const char *format, ...);
int sscanf(const char *str, const char *format, ...);

#include <stdarg.h>

int vscanf(const char *format, va_list ap);
int vsscanf(const char *str, const char *format, va_list ap);
int vfscanf(FILE *stream, const char *format, va_list ap);

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/***********************************************

char *strchr(const char *s, int c);
char *strrchr(const char *s, int c);
char *strchrnul(const char *s, int c);

str: 要搜索的字符串。
c: 要查找的字符

strchr() 查找字符的第一次出现。
strrchr() 查找字符的最后一次出现。
strchrnul() 查找字符的第一次出现，如果未找到则返回指向字符串末尾的指针。

**********************************************/