Question

我一直在尝试调试此代码超过两周..
此代码是我的项目的一部分＆＃34;离线系统爬虫＆＃34;。目前，关注的功能是：< BR />

＆＃34; scanitall＆＃34; function打开文件＆＃34; outputproject.txt＆＃34;并将所有元素逐行插入由全局变量＆＃34; * front＆＃34;定义的队列中。和＆＃34; *后＆＃34;这是节点类型。

创建队列后，功能＆＃34; processit＆＃34;进一步获取文件＆＃34; inputproject.txt＆＃34; line作为参数，然后标识文件中的链接（链接在文本文件中的类型为** link **），并进一步将其附加到＆＃34; outputproject.txt＆＃34;。
现在的问题是，推送中的cout总是显示＆＃34; val＆＃34;
的值（而不是＆＃34;后面＆gt;值＆＃34;和＆＃34; front-＆gt; value＆＃34;）
作为参数传递给函数，类似地＆＃34; scanitall＆＃34; function cout显示＆＃34; line1＆＃34;
的值（而不是＆＃34; rear-＆gt; value＆＃34;＆＃34; front-＆gt; value＆＃34 ;）

#include<iostream>
#include<fstream>
#include<string.h>
#include<stdio.h>
using namespace std;
ifstream infile;
ofstream outfile;
struct node
{
    struct node *next;
    char *value;
}*front,*rear;
/*struct node * createnode(char *val)
{
    struct node *new1=new node;
    new1->next=NULL;
    new1->value=val;
    return new1;
}*/
void push(char *val)
{
    cout<<"\nPush Called with argument : "<<val<<endl;
    if(front && rear)
        cout<<"\nPush called->rear->"<<rear->value<<"->front->"<<front->value<<" val-> "<<val<<endl;
    struct node *new1=new node;
    new1->next=NULL;
    new1->value=val;
    if(front==NULL && rear==NULL)
    {
        rear=new node;
        front=new node;
        rear=new1;
        front=new1;
        cout<<"\nCreated a node 1\n";
    }
    else
    {
        rear->next=new1;
        rear=rear->next;
        //front->next=NULL;
        cout<<"\ncreated a node 2\n";
    }
    cout<<"Rear->"<<rear->value<<" =>> Front->"<<front->value<<"\n";
}
/*char *pop()
{
    cout<<"Pop called\n";
    char *ch;
    if(front==NULL)
        return NULL;
    else if(front==rear)
    {
        ch=front->value;
        front=NULL;
        rear=NULL;
        return ch;
    }
    else
    {
        ch=front->value;
        front=front->next;
        return ch;
    }
}*/
void scanitall()
{
    cout<<"scanitall called\n";
    string line;
    infile.open("outputproject.txt");
    while(getline(infile,line))
    {
        char line1[100];
        strncpy(line1, line.c_str(), sizeof(line1));
        line1[sizeof(line1) - 1] = 0;
        if(rear)
            cout<<"\n--------Rear->"<<rear->value<<"--------front->"<<front->value<<"-----\n";
        else
            cout<<"\n----------Rear empty at this time---------\n";
        push(line1);
    }
    infile.close();
}
void processit(char *abc)
{
    // cout<<"PRocess it called\n";
    outfile.open("outputproject.txt",ios::app);
    if(!outfile)
        cout<<"Error file not opened!";
    int i,len,flag=0;
    len=strlen(abc);
    for(i=0;i<len;i++)
    {
        if(abc[i]=='*' && abc[i+1]=='*' && flag==0)
        {
            flag=1;
            i+=2;
        }

        if(abc[i]=='*' && abc[i+1]=='*' && flag==1)
        {
            outfile<<endl;
            flag=0;
            i+=2;
        }

        if(flag==1)
            outfile<<abc[i];
    }
    outfile.close();
}
void display(char *line)
{
    // cout<<"display called\n";
    string line2;
    char ch;
    infile.open(line);
    if(!infile)
        cout<<"File not opened!  ";
    while(getline(infile,line2))
    {
        cout<<line2;
        cout<<endl;
    }
    cout<<endl;
    cout<<endl;
    infile.close();
}
void openallfiles()
{
    // cout<<"openallfiles called\n";
    string line;
    char line1[100];
    infile.open("outputproject.txt");
    while(getline(infile,line))
    {
        strncpy(line1, line.c_str(), sizeof(line1));
        line1[sizeof(line1) - 1] = 0;
        display(line1);
    }
    infile.close();
}
int main()
{
    front=NULL;
    rear=NULL;
    scanitall();
    string line;
    char line1[100];
    infile.open("inputproject.txt");
    while(getline(infile,line))
    {
        strncpy(line1, line.c_str(), sizeof(line1));
        line1[sizeof(line1) - 1] = 0;
        processit(line1);
    }
    infile.close();
    openallfiles();
    return 0;
}

＆＃34; COUT＆＃34;应该显示队列的前后，而不是显示＆＃34; val＆＃34;的值。在推送功能和＆＃34; line1＆＃34;在scanitall功能。为什么？

0 个答案: