大数据内存模型(二级指针)

Posted 2020-06-13

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <Windows.h>
#include <memory.h>
#define path "E:\\杂乱test\\内存大数据模型\\1E~001.txt"
char **g_pp;
int imax = 8435714;//标识有多少行
int jmax = 20027;//标识最宽

int getJmax()
{
	int width = -1;
	FILE *pf = fopen(path, "r");//读文件打开路径
	if (pf == NULL)
	{
		printf("文件打开失败");
	}
	else
	{
		while (!feof(pf))
		{
			char readStr[30000] = { 0 };

			fgets(readStr, 30000, pf);//读取一行
			readStr[29999] = ‘\0‘;//最后为字符串结束
			int strLength = strlen(readStr);

			if (strLength > width)
			{
				width = strLength;
			}
		}
		fclose(pf);//关闭
	}

	return width;
}

int getImax()
{
	int hang = -1;
	FILE *pf = fopen(path, "r");//读文件打开路径
	if (pf == NULL)
	{
		hang = -1;
		printf("文件打开失败");
	}
	else
	{
		while (!feof(pf))
		{
			char readStr[1024] = { 0 };

			fgets(readStr, 1024, pf);//读取一行

			hang++;
		}
		fclose(pf);//关闭
	}

	return hang;
}

void loadFromFile()
{
	g_pp = (char **)malloc(sizeof(char*)*imax);//分配指针数组 多少行
	memset(g_pp, ‘\0‘, sizeof(char*)*imax);
	FILE *pf = fopen(path, "r");
	if(pf == NULL)
	{
		printf("文件打开失败");
		return;
	}
	else
	{
		for (int i = 0; i < imax;i++)
		{
			char str[1024] = { 0 };
			fgets(str, 1024, pf);//按行读取
			str[1023] = ‘\0‘;
			int strLength = strlen(str);
			if (strLength < 50)
			{
				g_pp[i] = malloc(sizeof(char)*(strLength + 1));
				strcpy(g_pp[i], str);//拷贝到分配的内存
			}
		}
		fclose(pf);
		printf("载入完成\n");
	}
}

void search(char *str)
{
	if (g_pp != NULL)
	{
		for (int i = 0; i < imax; i++)
		{
			if (g_pp[i] != NULL)
			{

				char *p = strstr(g_pp[i], str);//找到返回地址,否则返回NULL
				if (p != NULL)
				{
					puts(g_pp[i]);//打印
				}
			}
		}
	}
}

void main()
{
	loadFromFile();
	while (1)
	{
		char str[100] = { 0 };
		scanf("%s", str);
		search(str);//检索
	}

	system("pause");
}