81.内存模式实现cgi查询

• 创建全局的二级指针

   char  ** g_pp;//全局的二级指针

• 获取数据有多少行

   //获取行数
   int getimax()
   {
       int hang = -;
       FILE *pf = fopen(path, "r");//读文件打开路径
       if (pf == NULL)
       {
           printf("文件打开失败");
           return -;
       }
       else
       {
           hang = ;
           while (!feof(pf))//到了文件末尾返回1，没有返回0
           {
               char readstr[] = {  };
  
               fgets(readstr, , pf);//读取一行
  
               hang++;//自增
  
           }
           fclose(pf);//关闭
           return hang;
       }
   }

• 定义行数

   int   imax = ;//标示有多少行

• 载入内存

   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 -;
       }
       else
       {
           for (int i = ; i < imax; i++)
           {
               char str[] = {  };
               fgets(str, , pf);//按行读取
               str[ - ] = '\0';
               int  strlength = strlen(str);
  
               g_pp[i] = malloc(sizeof(char)*(strlength + ));//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
       }
   }

• 查询并写入到文件

  void search(char *str)
  {
      char strpath[] = {  };
      sprintf(strpath, "I:\\%s.txt", str);
      FILE *pf = fopen(strpath, "w");//写的模式打开
  
      if (g_pp != NULL)
      {
  
          for (int i = ; 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);
  }

• main

       loadfromfile();
       printf("Content-type:text/html\n\n");//换行
  
       system("mkdir 1");
  
       char szpost[] = {  };
       gets(szpost);
       printf("%s", szpost);
  
       char*p1 = strchr(szpost, '&');
       if (p1 != NULL)
       {
           *p1 = '\0';
       }
       printf("<br>%s", szpost + );
       printf("<br>%s", change(szpost + ));
  
       char *p2 = strchr(p1 + , '&');
       if (p2 != NULL)
       {
           *p2 = '\0';
       }
       printf("<br>%s", p1 + );
       printf("<br>%s", change(p1 + ));
  
       search(szpost + );//检索

• cgi格式转换

   char* change(char *str)
   {
       char *tempstr = malloc(strlen(str) + );
       int x = , y = ;
       char assii_1, assii_2;
       while (tempstr[x])
       {
           if ((tempstr[x] = str[y]) == '%')
           {
               //y+1 y+2
               if (str[y + ] >= 'A')
               {
                   assii_1 = str[y + ] - ;
  
               }
               else
               {
                   assii_1 = str[y + ] - ;
               }
               if (str[y + ] >= 'A')
               {
                   assii_2 = str[y + ] - ;
               }
               else
               {
                   assii_2 = str[y + ] - ;
               }
               tempstr[x] = assii_1 *  + assii_2;
  
               y += ;
  
           }
           x++;
           y++;
       }
       tempstr[x] = '\0';
  
       return tempstr;
   }

完整代码

 #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 = ;//标示有多少行

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

             fgets(readstr, , pf);//读取一行

             hang++;//自增

         }
         fclose(pf);//关闭
         return hang;
     }
 }

 char* change(char *str)
 {
     char *tempstr = malloc(strlen(str) + );
     int x = , y = ;
     char assii_1, assii_2;
     while (tempstr[x])
     {
         if ((tempstr[x] = str[y]) == '%')
         {
             //y+1 y+2
             if (str[y + ] >= 'A')
             {
                 assii_1 = str[y + ] - ;

             }
             else
             {
                 assii_1 = str[y + ] - ;
             }
             if (str[y + ] >= 'A')
             {
                 assii_2 = str[y + ] - ;
             }
             else
             {
                 assii_2 = str[y + ] - ;
             }
             tempstr[x] = assii_1 *  + assii_2;

             y += ;

         }
         x++;
         y++;
     }
     tempstr[x] = '\0';

     return tempstr;
 }

 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 -;
     }
     else
     {
         for (int i = ; i < imax; i++)
         {
             char str[] = {  };
             fgets(str, , pf);//按行读取
             str[ - ] = '\0';
             int  strlength = strlen(str);

             g_pp[i] = malloc(sizeof(char)*(strlength + ));//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[] = {  };
     sprintf(strpath, "I:\\%s.txt", str);
     FILE *pf = fopen(strpath, "w");//写的模式打开

     if (g_pp != NULL)
     {

         for (int i = ; 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);
 }

 void main()
 {

     loadfromfile();
     printf("Content-type:text/html\n\n");//换行

     system("mkdir 1");

     char szpost[] = {  };
     gets(szpost);
     printf("%s", szpost);

     char*p1 = strchr(szpost, '&');
     if (p1 != NULL)
     {
         *p1 = '\0';
     }
     printf("<br>%s", szpost + );
     printf("<br>%s", change(szpost + ));

     char *p2 = strchr(p1 + , '&');
     if (p2 != NULL)
     {
         *p2 = '\0';
     }
     printf("<br>%s", p1 + );
     printf("<br>%s", change(p1 + ));

     search(szpost + );//检索
 }