invalid null pointer！

Question

// win_cDemo.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include "tinyxml.h"
#include "NLPIR.h"
#include <stdio.h>
#include <stdlib.h>
#include<windows.h>
#include <fstream>
#include <iostream>
#include <string>
#include <hash_map>

#include <WinSock.h>
#include <mysql.h>

using namespace std;
#pragma comment(lib,"tinyxml.lib")
#pragma comment(lib, "NLPIR.lib")
#pragma comment(lib, "ws2_32.lib")   
#pragma comment(lib, "libmysql.lib") 

//存放字典数据的hashMap
hash_map<string,float> hmDic;
//计算运行时间的变量
DWORD start_time,end_time;
//mysql文件
MYSQL mysqlData;
string user,passwd;



void processDictionary(string filename,float weight)
{
    ifstream fin(filename.c_str());  
    if( !fin ) 
    {   
        cout << "Error opening " << filename << " for input" << endl;   
        return;  
    }
    string buf;
    while(fin>>buf)
    {
        hmDic.insert(make_pair(buf,weight));
    }
    cout<<"Process Dictionary "<<filename<<" Success"<<endl;
}


void processConfigure()
{
    //获取XML对象
    TiXmlDocument doc; 
    //装载文件
    doc.LoadFile("configure.xml");
    //获取dics
    TiXmlElement *dicsLevel = (doc.RootElement())->FirstChildElement();
    //获取dic
    TiXmlElement *dicLevel=dicsLevel->FirstChildElement();
    TiXmlElement *pathLevel,*weightLevel;
    start_time = GetTickCount64();//获取开始时间
    cout<<"Process Begin, Please Wait Patient"<<endl;
    while (dicLevel != NULL)//
    {
        pathLevel = dicLevel->FirstChildElement();//获取path
        weightLevel = pathLevel->NextSiblingElement();//获取weight        
        //cout<<pathLevel->GetText()<<":"<<weightLevel->GetText()<<endl;
        //处理文本
        string filename =pathLevel->GetText();
        float weight = atof(weightLevel->GetText());
        //cout<<filename<<"|"<<weight+1<<endl;
        processDictionary(filename,weight);
        dicLevel=dicLevel->NextSiblingElement();
    }
    end_time = GetTickCount64();//获取结束时间
    cout<<"Process All Dictionary Use "<<end_time-start_time<<" ms"<<endl;

    //获取mysql
    TiXmlElement *mysqlLevel = dicsLevel->NextSiblingElement();
    TiXmlElement *userLevel,*passwdLevel;

    userLevel = mysqlLevel->FirstChildElement();//获取user
    passwdLevel = userLevel->NextSiblingElement();//获取passwd
    user = userLevel->GetText();
    passwd = passwdLevel->GetText();


}


int sentenceAnalysis(string sSentence)
{
    try
    {
        const result_t *pVecResult;
        int nCount;
        //对句子进行分词
        pVecResult=NLPIR_ParagraphProcessA(sSentence.c_str(),&nCount);
        float totalNum = 0;//句子总的情感值
        float tmpNum = 0;//每个字句的情感值
        float tmpD = 1;//用来存放临时副词的变量
        bool isTmpDSet = 0;//是否有副词被设置
        for (int i=0;i<nCount;i++)
        {

            string ciXin = pVecResult[i].sPOS;//词性
            //不存在词性则跳过
            if(ciXin.empty())
            {
                continue;
            }


            //词性中包含'w'（即标点符号）,表示当前的一个子句已经处理完毕
            if(ciXin[0]=='w')
            {
                totalNum += tmpNum;
                tmpNum = 0;
                continue;
            }

            //如果不是形容词a,副词d,动词v,名词n,数词m,则不处理
            if(!(ciXin=="a"||ciXin=="d"||ciXin=="v"||ciXin=="n"||ciXin=="m"))
                continue;

            string tmp = sSentence.substr(pVecResult[i].start,pVecResult[i].length);

            auto itr=hmDic.find(tmp);
            if(itr!=hmDic.end())
            {
                if(ciXin=="d")//如果副词后面接副词,进行多重复合
                {
                    tmpD *= itr->second;
                    isTmpDSet = 1;
                }
                else if(isTmpDSet)//如果之前存在副词
                {
                    tmpNum += tmpD * itr->second;
                    isTmpDSet = 0;
                }
                else
                {
                    tmpNum += itr->second;//不存在副词的影响，直接加减
                }

            }

        }

        return totalNum;
    }
    catch(...)
    {
        //对出错的情况进行默认处理
        return 0;
    }

}

void initMysql()
{
    try
    {
        mysql_init(&mysqlData);

        // localhost:服务器 root为账号,123456为密码 test为数据库名 3306为端口
        if(!mysql_real_connect(&mysqlData, "localhost","root","","fooddata",3306,NULL,0)) 
        {

            cout<<"database connect fail"<<endl;
            exit(1);
        } 
        else
            cout<<"database connect success"<<endl;

    }
    catch (...)
    {
        exit(1);
    }
}


int main()
{
    //初始化分词器
    if(!NLPIR_Init()) 
    {
        printf("Init fails\n");
        return -1;
    }

    //首先读取配置文件，建立字典数据
    processConfigure();

    //初始化mysql数据库
    initMysql();

    //存储每一行数据
    string text;

    //查询所有结果
    string sqlstr = "SELECT id,text,kind FROM comment";  
    MYSQL_RES *result = NULL;  
    if (0 == mysql_query(&mysqlData, sqlstr.c_str())) 
    {  

        //一次性取得数据集   
        result = mysql_store_result(&mysqlData);   
        //获取每一行
        MYSQL_ROW row = NULL;  
        row = mysql_fetch_row(result);  

        start_time = GetTickCount64();
        while (NULL != row) {  

            text = row[1];
            //对每个句子进行分词
            int answer = sentenceAnalysis(text);

            if(answer>0)
                cout<<"正面评价"<<endl;
            else if(answer<0)
                cout<<"负面评价"<<endl;
            else
                cout<<"中性评价"<<endl;


            row = mysql_fetch_row(result);  
        }  

        end_time = GetTickCount64();

        cout<<"Text all rows use "<<end_time-start_time<<" ms"<<endl;

    }
    //关闭数据库
  // mysql_close(&mysqlData);

   //释放分词器资源
    NLPIR_Exit();
    return 0;

} 

求大神看看这个怎么修改？？？

Answer 1

就是停止到这里，不知道如何解决了

`static size_t __CLRCALL_OR_CDECL length(const _Elem *_First)
{ // find length of null-terminated string
return (*_First == 0 ? 0
: _CSTD strlen(_First));
}