#include <iostream>
#include <string.h>
#include <ctime>
#include <fstream>
#define MAX 33227
#include <string>
using namespace std;
class dict_word
{
public:
char *word;//英文单词指针
//char *chinese;//中文意思指针
};
//创建一个打开字典的函数
int open_dict(dict_word **word, const char * dict_filename)//读取字典文件中的内容放到堆内存中
{
//使用文件IO流打开字典文件,打开文件用于读
ifstream infile(dict_filename, ios::in | ios::binary);
FILE *fp = fopen(dict_filename, "r");
if (fp == NULL)
{
cerr << "open file error" << endl;
return 0;
}
/*if (!infile)
{
cerr << "file open error" << endl;
return -1;
}*/
//给字典类的指针分配内存出并清空（根据单词个数来分配内存）MAX是文件中的单词个数
*word = (dict_word*)malloc(sizeof(dict_word)*MAX);//固定分配MAX的内存*word是一个存放结构体指针的数组的首地址
memset(*word, 0, sizeof(dict_word)*MAX);//清空结构体指针数组的内存
dict_word *pd = *word;//pd 指向结构体指针数组的首地址
//定义一个存放单词内容的BUF
char buf[1024] = { 0 };
int len = 0;//计算读取到字符串的长度
int i = 0;//单词计数器
//while (getline(infile, buf))//一行一行读，将读到的内容放到buf中
while(fgets(buf,sizeof(buf),fp))
{
len = strlen(buf);//读取到字符串的长度
if (len >0)
{
pd[i].word = (char *)malloc(len+1);//根据字符串长度分配空间
//清空分配好的空间
memset(pd[i].word, 0, len+1);
strncpy(pd[i].word, buf,len+1);//将读取到的内容拷贝到中
}
len = 0;
i++;
}
infile.close();//关闭文件IO
fclose(fp);
return i;
}
int serach_word(char *cin_word, const dict_word*word1)//在堆内存中查找cin_word的单词
{
string st1 = cin_word;
string st2;
int i = 0,n = strlen(cin_word);
while (i < MAX && word1->word !=NULL)
{
st2 = word1->word;
//if (!strcmp(cin_word, word1->word, strlen(cin_word)))//查找到对应的单词
if(!st1.compare(0,n,st2,0,n))
{
strcpy(cin_word, word1->word);//将找到的单词及汉语意思复制到cin_word
return 1;
}
i++;
word1++;
}
strcpy(cin_word, "没有找到你要的单词");
return 0;
}
void free_dict(dict_word *dictword)
{
int i = 0;
for (i = 0; i < MAX; i++)
{
free(dictword[i].word);
dictword[i].word = NULL;
}
free(dictword);
dictword = NULL;
}
int main(int argc, char **argv)
{
/*if (argc < 2)
{
cout << "请在可执行文件后加上字典所在的路径" << endl;
cout << "usage: a.out dictionaryFilePath" << endl;
return -1;
}*/
long start_time = clock();//记录函数开始执行的时间
dict_word *word = NULL;//定义类指针
int word_count = open_dict(&word, "D:\\hanyingdictionary.txt");
if (word_count <= 0)
{
cerr << "文件中单词数不正确" << endl;
return -1;
}
long end_time = clock();
cout << "打开文件并将文件中的内容读取到堆内存中所消耗的时长是：" << end_time - start_time << "ms" << endl;
char cin_word[1024] = { 0 };
start_time = clock();//记录查找函数执行的时间
while (1)
{
memset(cin_word, 0, sizeof(cin_word));
cout << "请输入你要查找的词语-->" ;
cout << "输入command=exit退出程序" << endl;
cin >> cin_word;
if (!cin_word)
continue;
string st = cin_word;
if (!st.compare(0,12,"command=exit", 0, 12))
{
break;//输入退出命令，循环退出
}
start_time = clock();//记录查找函数执行的时间
if (serach_word(cin_word, word))//在堆内存中查找所要的单词
{
end_time = clock();
cout << cin_word ;//将找到的单词输出
cout << "查找该单词所消耗的时长是：" << end_time - start_time << "ms" << endl;
}
else
{
end_time = clock();
cout << "查找单词所消耗的时长是：" << end_time - start_time << "ms" << endl;
cout << cin_word << endl;//没有找到单词，输出没有找到你所要查找的单词
}
}
start_time = clock();
//释放堆内存空间
free_dict(word);
end_time = clock();
cout << "释放堆内存空间消耗的时长是：" << end_time - start_time << "ms" << endl;
return 0;
}