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linux下的 fopen等

Linux下的fopen fread fwrite fclose fseek函数

  1. fopen()函数
    功能:用于打开文件。
    所需头文件:#incldue<stdio.h>
    函数原型:FILE * fopen(const char *pathname, const char *method);

    参数
    pathname:被打开文件的文件路径以及文件名。
    method:打开文件的方式。
    具体方式如下
    “r" 或 ”rb" 以只读方式打开文件。
    “w" 或 ”wb" 以写方式打开文件,新内容会覆盖原本内容。
    “a” 或 “ab” 以写方式打开文件,新内容追加在文件末尾。

    返回值:文件打开成功,指向该文件指针就会被返回。如果文件打开失败则返回NULL。

  2. fread()函数
    功能:用于读取数据。
    函数原型:int fread ( void *buffer, int size,int count, FILE *stream) ;

    参数
    buffer:用于接收数据的内存地址。
    size:要读写的单字节数,单位是字节。
    count:要读取多少个数据。
    stream:指向要读取文本的指针。

    返回值:返回实际读取的数据的个数,应返回值与count相同。

  3. fwrite()函数
    功能:向一个文本写入数据。
    函数原型:int fwrite ( void *buffer, int size,int count, FILE *stream) ;

    参数
    buffer: 一般要写入的数据,事先先写到缓存buffer中,当需要写入文本时,数据从此一个个写入。
    size: 要写入内容的单字节数。
    count: 写入数据的个数。
    stream: 目标文本指针,即要存在那个文本中。

    返回值: 返回写入数据的个数。

  4. fclose()函数
    功能: 关闭一个流。
    函数原型: int fclose( FILE *file )

    返回值: 如果流成功关闭,fclose 返回 0,否则返回-1。

  5. fseek()函数
    功能: 它在文件流里为下一次读写操作指定位置。
    函数原型: int fseek(FILE *stream, long offset, int fromwhere);

    参数:
    stream: 文件指针。
    offset: 偏移量,就是相当于当前位置,向左(右)移动几位。正数表示右向偏移,负数表示左向偏移。
    fromwhere: 定义文件中哪里开始偏移,取值可为:SEEK_CUR(当前位置)、 SEEK_END (文件结尾)或 SEEK_SET(文件开头)。
    其中SEEK_SET,SEEK_CUR和SEEK_END依次为0,1和2。

    返回值: 如果执行成功,函数返回0。如果执行失败,函数返回一个非0值。

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fopen,fread,fclose,fgetc,fscanf,ftell等函数的用法

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02-13 阅读数 8680

我问了身边10个大佬,总结了他们的学习方法,原来成功都是有迹可循的。 博文 来自: 敖丙

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阿里程序员写了一个新手都写不出的低级bug,被骂惨了。

01-13 阅读数 6万+

这种新手都不会范的错,居然被一个工作好几年的小伙子写出来,差点被当场开除了。... 博文 来自: 敖丙

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