minGW 的头文件（stdio.h）中这样定义了 FILE 结构体（注释来自网路）：
file struct
1 typedef struct _iobuf { 2 char *_ptr; //文件输入的下一个位置 3 int _cnt; //当前缓冲区的相对位置 4 char *_base; //指基础位置(应该是文件的其始位置) 5 int _flag; //文件标志 6 int _file; //文件的有效性验证 7 int _charbuf; //检查缓冲区状况,如果无缓冲区则不读取 8 int _bufsiz; //文件的大小 9 char *_tmpfname; //临时文件名 10 } FILE;
写了一段程序测试。。
test code FILE
1 #include <stdio.h> 2 #include <stdlib.h> 3 #include "main.h" 4 5 6 int main(int n,char *cmdstr[]){ 7 8 FILE *fp = NULL ; 9 10 if(2 != n){ 11 system("pause"); 12 return 0; 13 } 14 else{ 15 printf("File name is %s \n",cmdstr[1]); 16 fp = fopen(cmdstr[1],"rb+"); 17 } 18 19 printf("********** open a file *********************\n"); 20 printf("_ptr = %s \n", fp->_ptr); 21 printf("_cnt = %d \n", fp->_cnt); 22 printf("_base = %s \n", fp->_base); 23 printf("_flag = %d \n", fp->_flag); 24 printf("_file = %d \n", fp->_file); 25 printf("_charbug = %d \n", fp->_charbuf); 26 printf("_bufsiz = %d \n", fp->_bufsiz); 27 printf("_temfname = %s \n", fp->_tmpfname); 28 29 printf("\n"); 30 if(NULL != fp) 31 fclose(fp); 32 33 printf("********** close the file *********************\n"); 34 printf("_ptr = %s \n", fp->_ptr); 35 printf("_cnt = %d \n", fp->_cnt); 36 printf("_base = %s \n", fp->_base); 37 printf("_flag = %d \n", fp->_flag); 38 printf("_file = %d \n", fp->_file); 39 printf("_charbug = %d \n", fp->_charbuf); 40 printf("_bufsiz = %d \n", fp->_bufsiz); 41 printf("_temfname = %s \n", fp->_tmpfname); 42 43 system("pause"); 44 return 1; 45 }
效果图：
