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std::rewind

STD：倒带

Defined in header ​​
void rewind( std::FILE* stream ​​

将文件位置指示符移动到给定文件流的开头。

这个函数相当于std::fseek(stream, 0,SEEK_SET，除非文件末尾和错误指示符被清除。

该函数从以前的调用中删除对ungetc...

参数

stream-file stream to modify

返回值

%280%29

例

二次

#include <cstdio>
 
int main()
{
    std::FILE *f;
    char ch;
    char str[20];
 
    f = std::fopen("file.txt", "w"
    for (ch = '0'; ch <= '9'; ch++) {
        std::fputc(ch, f
    }
    std::fclose(f
 
 
    std::FILE* f2 = std::fopen("file.txt", "r"
    unsigned int size = std::fread(str, 1, 10, f2
    std::puts(str
    std::printf("\n%u\n",size
 
    std::rewind(f2
    unsigned int size2 = std::fread(str, 1, 10, f2
    std::puts(str
    std::printf("\n%u",size2
    std::fclose(f2
}

二次

另见

fseekmoves the file position indicator to a specific location in a file (function)

C文件用于倒带

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