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C stdio ftell() 函数

❮ C stdio 库


示例

显示文件中当前位置

FILE *fptr;
fptr = fopen("filename.txt", "a");

int position = ftell(fptr);
printf("%d", position);

fclose(fptr);

定义和用法

ftell() 函数返回位置指示器的值。这是文件中下一个读或写操作将执行的位置。

ftell() 函数在 <stdio.h> 头文件中定义。


语法

ftell(FILE * fptr);

参数值

参数 描述
fptr 必需。文件指针,通常由 fopen() 函数创建。

技术细节

返回值 一个 int 值,表示位置指示器的当前值。

❮ C stdio 库

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