1:C语言文件IO
C语言中的文件操作函数如下：
文件操作函数 | 功能 |
|---|---|
fopen | 打开文件 |
fclose | 关闭文件 |
fputc | 写入一个字符 |
fgetc | 读取一个字符 |
fputs | 写入一个字符串 |
fgets | 读取一个字符串 |
fprintf | 格式化写入数据 |
fscanf | 格式化读取数据 |
fwrite | 向二进制文件写入数据 |
fread | 从二进制文件读取数据 |
fseek | 设置文件指针的位置 |
ftell | 计算当前文件指针相对于起始位置的偏移量 |
rewind | 设置文件指针到文件的起始位置 |
ferror | 判断文件操作过程中是否发生错误 |
feof | 判断文件指针是否读取到文件末尾 |
下面只会选择性对C语言的部分文件操作函数进行使用，若想详细了解其余文件操作函数的使用方法，请跳转到博主的其它博客：文件处理不再难:带你轻松攻克C语言文件操作_c语言大文件处理-CSDN博客
代码语言：javascript
AI代码解释
#include <stdio.h> #include <unistd.h> #include <sys/types.h> #include <sys/wait.h> #include <stdlib.h> int main() { FILE * fp = fopen("log.txt","w"); if(NULL == fp) { perror("fopen"); exit(-1); } fclose(fp); fp = NULL; return 0; }运行程序后，在当前路径下就会生成对应文件.
那么我们也可以通过输出重定向向文件里面写入新的内容.
1.1:对文件的初步理解
那么有了上面的简单例子我们可以对文件有一个简单的初步理解
- 打开文件,本质是进程在打开文件.
- 文件在没有被打开的时候,在什么地方上------->在磁盘上头.
- 进程能够同时打开很多文件.
系统中可以存在很多进程------------>很多情况下,OS内部,一定存在大量的被打开的文件---------->那么OS就要对这些被打开的文件进行处理,先描述,再组织------->因此可以推测,每一个被打开的文件在OS内部,一定要存在对应的描述文件属性的结构体,类似与PCB.
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