#include <stdio.h>#include <stdlib.h>#include <string.h>typedef struct _QQData
...{
long uid; char nickName[20];
}QQData;#define C_CACHE_BLOCK 100 //保存100个内存块#define C_CACHE_ENTRY 10 //每个内存块有10个itembool iCacheInited = false;char * pCacheShm = NULL;//根据送进来的参数，抽取指定的位的数int GetPartInt(int uid,int iBegin,int iEnd)...{ char p[20]; char ret[20]; memset(p,0,20); memset(ret,0,20); sprintf(p,"%d",uid); strncpy(ret,p+iBegin-1,iEnd); return atoi(ret);}void InitCache()...{ //用堆中的内存去模拟共享内存 pCacheShm = new char[sizeof(QQData) * C_CACHE_BLOCK *C_CACHE_ENTRY ]; if(pCacheShm != NULL)
...{ iCacheInited = true; memset(pCacheShm,0,sizeof(QQData) * C_CACHE_BLOCK *C_CACHE_ENTRY);
}}void DetoryCache()...{ delete[] pCacheShm;}//将一个QQ的结构体加入内存void InsertCache(const QQData *data)...{ int iBlockIndex,iEntryIndex,i; QQData *pstEntry,*pstFirstEntry; if(data->uid == 0 ||iCacheInited == false || strlen(data->nickName) == 0 ) return; iBlockIndex = GetPartInt(data->uid,1,2); if(iBlockIndex > C_CACHE_BLOCK) ...{ printf("key too large"); return; } pstEntry = (QQData *)(pCacheShm+sizeof(QQData)*C_CACHE_ENTRY*iBlockIndex); pstFirstEntry = pstEntry; for (i=0;i<C_CACHE_ENTRY;i++) ...{ if (pstEntry->uid==0) //找到第一个为空的Entry ...{ memcpy(pstEntry,data,sizeof(QQData)); return ; } else if ((pstEntry->uid == data->uid) && (strcmp(pstEntry->nickName,data->nickName) ==0)) ...{ //不用添加 return ; } pstEntry++; iEntryIndex++; } pstEntry=(QQData *)pstFirstEntry+iEntryIndex; memcpy(&pstEntry,data,sizeof(QQData));}//从内存中读取该QQ结构体void ReadFromCache(QQData *data)...{ int iBlockIndex,iEntryIndex,i,iPhoneNo; short iArea; QQData *pstEntry; if (!iCacheInited) ...{ return; } iBlockIndex = GetPartInt(data->uid,1,2); if(iBlockIndex > C_CACHE_BLOCK) ...{ printf("key too large"); return; } pstEntry = (QQData *)(pCacheShm+sizeof(QQData)*C_CACHE_ENTRY*iBlockIndex); for (i=0;i<C_CACHE_ENTRY;i++) ...{ if(pstEntry->uid == data->uid) ...{ memcpy(data,pstEntry,sizeof(QQData)); return ; } pstEntry++; } return ;}void main()...{ QQData *qqdata = new QQData; qqdata->uid = 31611008; memset(qqdata->nickName,0,sizeof(qqdata->nickName)); strcpy(qqdata->nickName,"maomao"); InitCache(); InsertCache(qqdata); qqdata->uid = 31611009; memset(qqdata->nickName,0,sizeof(qqdata->nickName)); strcpy(qqdata->nickName,"maomao1"); InsertCache(qqdata); //根据QQ号码查询昵称 QQData *qqdata1 = new QQData; qqdata1->uid = 31611008; ReadFromCache(qqdata1); printf("31611008 的昵称为：%s ",qqdata1->nickName); qqdata1->uid = 31611009; ReadFromCache(qqdata1); printf("31611009的昵称为：%s ",qqdata1->nickName); DetoryCache(); delete qqdata; delete qqdata1;}
网络安全 博客 下载
论坛 English 编程手册
发表评论 
打印本文
推荐本文
加入收藏
返回顶部
关闭窗口
