Linux:C语言编程:fread

fread

函数名: fread
功  能: 从一个流中读数据
用  法: int fread(void *ptr, int size, int nitems, FILE *stream);
参  数:用于接收数据的地址(ptr)
        单个元素的大小(size)
        元素个数(nitems)
        提供数据的文件指针(stream)
返回值:成功读取的元素个数
程序例:
#include <string.h>
#include <stdio.h>
int main(void)
{
   FILE *stream;
   char msg[] = "this is a test";
   char buf[20];
   if ((stream = fopen("DUMMY.FIL", "w+"))
       == NULL)
   {
      fprintf(stderr,
              "Cannot open output file.\n");
      return 1;
   }
   /* write some data to the file */
   fwrite(msg, strlen(msg)+1, 1, stream);
   /* seek to the beginning of the file */
   fseek(stream, SEEK_SET, 0);
   /* read the data and display it */
   fread(buf, 1, strlen(msg)+1, stream);
   printf("%s\n", buf);
   fclose(stream);
   return 0;
}

原文地址:https://www.cnblogs.com/pony/p/1015522.html