文件操作实例

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#define   _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include<memory.h>
#include <Windows.h>
#define  path  "kaifang.txt"

char  ** g_pp;//全局的二级指针
int   imax =20151574;//标示有多少行

int getimax()
{
	int hang = -1;
	FILE *pf = fopen(path, "r");//读文件打开路径
	if (pf == NULL)
	{
		printf("文件打开失败");
		return -1;
	}
	else
	{
		hang = 0;
		while (!feof(pf))//到了文件末尾返回1，没有返回0
		{
			char readstr[1024] = { 0 };

			fgets(readstr, 1024, pf);//读取一行

			hang++;//自增

		}

		fclose(pf);//关闭

		return hang;
	}
}


void loadfromfile()
{

	g_pp = (char **)malloc(sizeof(char*)*imax);	 //分配指针数组
	memset(g_pp, '\0', sizeof(char*)*imax);//内存清零


	FILE *pf = fopen(path, "r");//读文件打开路径
	if (pf == NULL)
	{
		printf("文件打开失败");
		return -1;
	}
	else
	{
		for (int i = 0; i < imax; i++)
		{
			char str[1024] = { 0 };
			fgets(str, 1024, pf);//按行读取
			str[1024 - 1] = '\0';
			int  strlength = strlen(str);
		

			g_pp[i] = malloc(sizeof(char)*(strlength + 1));//处理/0

			if (g_pp[i]!=NULL)
			{
				strcpy(g_pp[i], str);//拷贝到分配的内存
			}

		}

		fclose(pf);//关闭

	}
}

void search(char *str)
{
	char strpath[100] = {0};
	sprintf(strpath, "I:\\%s.txt", str);
	FILE *pf = fopen(strpath, "w");//写的模式打开

	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，找不到返回null
				if (p != NULL)
				{
					puts(g_pp[i]);//打印
					fputs(g_pp[i], pf);//输出到文件
				}
			}
		}
	}

	fclose(pf);
	system(strpath);//打开文件


}



void main()
{
	//printf("%d", getimax());
	//printf("%d", getjmax());
	loadfromfile();
	printf("检测完成\n");

	while (1)
	{
		char str[100] = { 0 };
		scanf("%s", str);//初始化str数组

		search(str);//检索
	}
	system("pause");
}

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#define   _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include<memory.h>
#include <Windows.h>
#define  path  "kaifang.txt"

char  ** g_pp;//全局的二级指针
int   imax =20151574;//标示有多少行

int getimax()
{
	int hang = -1;
	FILE *pf = fopen(path, "r");//读文件打开路径
	if (pf == NULL)
	{
		printf("文件打开失败");
		return -1;
	}
	else
	{
		hang = 0;
		while (!feof(pf))//到了文件末尾返回1，没有返回0
		{
			char readstr[1024] = { 0 };

			fgets(readstr, 1024, pf);//读取一行

			hang++;//自增

		}

		fclose(pf);//关闭

		return hang;
	}
}


void loadfromfile()
{

	g_pp = (char **)malloc(sizeof(char*)*imax);	 //分配指针数组
	memset(g_pp, '\0', sizeof(char*)*imax);//内存清零


	FILE *pf = fopen(path, "r");//读文件打开路径
	if (pf == NULL)
	{
		printf("文件打开失败");
		return -1;
	}
	else
	{
		for (int i = 0; i < imax; i++)
		{
			char str[1024] = { 0 };
			fgets(str, 1024, pf);//按行读取
			str[1024 - 1] = '\0';
			int  strlength = strlen(str);
		

			g_pp[i] = malloc(sizeof(char)*(strlength + 1));//处理/0

			if (g_pp[i]!=NULL)
			{
				strcpy(g_pp[i], str);//拷贝到分配的内存
			}

		}

		fclose(pf);//关闭

	}
}

void search(char *str)
{
	char strpath[100] = {0};
	sprintf(strpath, "I:\\%s.txt", str);
	FILE *pf = fopen(strpath, "w");//写的模式打开

	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，找不到返回null
				if (p != NULL)
				{
					puts(g_pp[i]);//打印
					fputs(g_pp[i], pf);//输出到文件
				}
			}
		}
	}

	fclose(pf);
	system(strpath);//打开文件


}



void main()
{
	//printf("%d", getimax());
	//printf("%d", getjmax());
	loadfromfile();
	printf("检测完成\n");

	while (1)
	{
		char str[100] = { 0 };
		scanf("%s", str);//初始化str数组

		search(str);//检索
	}
	system("pause");
}