| 词条 | fsetpos |
| 释义 | § 解释 函数名: fsetpos 功 能: 定位流上的文件指针 用 法: int fsetpos(FILE *stream, const fpos_t *pos); § 程序例 #include <stdlib.h> #include <stdio.h> void showpos(FILE *stream); int main(void) { FILE *stream; fpos_t filepos; /* open a file for update */ stream = fopen("DUMMY.FIL", "w+"); /* save the file pointer position */ fgetpos(stream, &filepos); /* write some data to the file */ fprintf(stream, "This is a test"); /* show the current file position */ showpos(stream); /* set a new file position, display it */ if (fsetpos(stream, &filepos) == 0) showpos(stream); else { fprintf(stderr, "Error setting file \\ pointer.\"); exit(1); } /* close the file */ fclose(stream); return 0; } void showpos(FILE *stream) { fpos_t pos; /* display the current file pointer position of a stream */ fgetpos(stream, &pos); printf("File position: %ld\", pos); } |
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