C语言实现txt数据读入内存/CPU缓存实例详解

摘要

C实现将txt数据读入内存/CPU缓存的函数，不多说，实现如下。

1. 实现代码

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									#include "stdafx.h" 

									#include <stdio.h> 

									#include <stdlib.h> 

									int filelength(FILE *fp); 

									char *readfile(char *path); 

									int main(void){ 

									  char *string; 

									  string=readfile("C:/Users/Joe WANG/Desktop/Data.txt"); 

									  printf("数据读入内存完毕！ \n"); 

									  printf("内存中的数据如下:\n%s \n",string); 

									  system("pause"); 

									  return 0; 

									} 

									char *readfile(char *path){ 

									  FILE *fp;   

									  int length; 

									  char *ch; 

									  if((fp=fopen(path,"r"))==NULL){ 

									    printf("open file %s error.\n",path); 

									    exit(0); 

									  } 

									  length=filelength(fp); 

									  ch=(char *)malloc(length); 

									  fread(ch,length,1,fp); 

									  *(ch+length)='\0'; 

									  return ch; 

									} 

									int filelength(FILE *fp){ 

									  int num; 

									  fseek(fp,0,SEEK_END); 

									  num=ftell(fp); 

									  fseek(fp,0,SEEK_SET); 

									  return num; 

									}