C++查詢wry.dat中的IP地址信息代码

2008-03-24 15:56:54　来源:中国自学编程网　作者:佚名点击:

直接上代碼（哪一位有不明白的地方，請留言）：

    if(searchIpNum<0xFF)...{
        return -1;
    }

ifstream fs;
fs.open(dat, ios::binary | ios::in, 0);

    if((!fs.is_open()) || (!fs.good())) ...{
        return -2;
    }

#if defined _DEBUG_
    cout<<" searchIpNum="<<searchIpNum<<", exeOffset="<<exeOffset<<endl;
#endif
    fs.seekg(exeOffset, ios_base::beg);
    ipBeginPos=read4Bit(fs);
#if defined _DEBUG_
    cout<<" ipBeginPos="<<ipBeginPos<<endl;
#endif
    ipEndPos=read4Bit(fs);
#if defined _DEBUG_
    cout<<" ipEndPos="<<ipEndPos<<endl;
#endif
    totalNum = (ipEndPos - ipBeginPos) / 7;
#if defined _DEBUG_
    cout<<" totalNum="<<totalNum<<endl;
#endif
    if(totalNum<1)...{
        return -3;
    }

    beginNum = 0;
    endNum   = totalNum;
    while( 1 ) ...{ //IP的索引是有順序的,按照個數來二分查找.
        midNum= beginNum+(DWORD)((endNum - beginNum)/2);
        pos = ipBeginPos+midNum*7;
        fs.seekg(exeOffset+pos, ios_base::beg);
#if defined _DEBUG_
        cout<<"times="<<++times<<", beginNum="<<beginNum<<", endNum="<<endNum

        <<", midNum="<<midNum<<", exeOffset+pos="<<exeOffset+pos
            <<endl;
#endif
        ip1Num=read4Bit(fs);
        if( ip1Num<1 ) ...{
            fs.close(); cout<<"[1]while(){...}"<<endl;
            return -2;
        }
#if defined _DEBUG_
        //printIpNum(ip1Num);
#endif
        fs.seekg(3, ios_base::cur);
        ip2Num=read4Bit(fs);
        if( ip2Num<1 ) ...{
            fs.close(); cout<<"[3]while(){...}"<<endl;
            return -2;
        }
#if defined _DEBUG_
        //printIpNum(ip2Num);
#endif