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

#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;
}

2. Data.txt中的源数据

3. 测试结果