vector<string> to array question: very new to this

[Etrex]

Hello,

This is my first attempt at a c++ program, and it is a long post, please bear with me.
I'm trying to read in a text file containing a firewall log, make the information searchable by an element (protocol, remote ip etc). The file is of known max width (65) containing 8 columns of known max size. The columns are seperated by white space. However, it is of unknown length. I read that to input this file in, I should use a vector. There are several commented out lines that I used to check my progress while mucking thru my attempt.
I've managed to ask for the filename, open the file and dump it into a vector<string>. This is where I hit the sensory overload wall:

What is correct way to step-thru a vector<string>? Using the simple for loop with for(int i=0;i<vector.size();i++) works; however, I've also read about using 'vector::iterator' to initilize vector step thrus.

Is it possible to put my vector into a two dimentional char array to manipulate or search the data. Is it possible to do this searching directly on the vector, by making a struct of the knowns elements and then vector<struct name>?

As you can see, I've reached the new user overload. Pointing me in a starting direction would be great and thanks for your help.

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
using namespace std;
 
int main () {
    vector<string> AllReadyReadin;
    // typedef vector<double>::size_type vector_sizeVariable;
    char filename[81];
    string input_line;
 
    cout << "Enter Filename to read: ";
    cin >> filename;
 
    // cout << "name of file to read is: " << filename << endl;
 
    //open file and see if it exsists
    ifstream file_toread(filename);
 
    if (!file_toread.is_open()) {
        cout << filename << " Could not be opened. " << endl;
        return -1;
    }
 
    while (!file_toread.eof()) {
 
    getline(file_toread, input_line);
    //temp check of file contents
    //cout << input_line << endl;
    AllReadyReadin.push_back(input_line);
    }    
    file_toread.close();
 
    //various ways to print out size of array
 
    //vector_sizeVariable size = AllReadyReadin.size();
    //cout << "Read in " << size << " lines" << endl;
 
    // cout << "Read in " << AllReadyReadin.size() << " lines" << endl;
 
    //dump vector to check contents
        //for(int i = 0;i < AllReadyReadin.size(); i++)
    //    cout << AllReadyReadin[i] << endl;
 
    return 0;
 
}

[Ganon11]

I've always just used array subscript notation and a for...loop, as you have in your code.

[gpraghuram]

Hello,

This is my first attempt at a c++ program, and it is a long post, please bear with me.
I'm trying to read in a text file containing a firewall log, make the information searchable by an element (protocol, remote ip etc). The file is of known max width (65) containing 8 columns of known max size. The columns are seperated by white space. However, it is of unknown length. I read that to input this file in, I should use a vector. There are several commented out lines that I used to check my progress while mucking thru my attempt.
I've managed to ask for the filename, open the file and dump it into a vector<string>. This is where I hit the sensory overload wall:

What is correct way to step-thru a vector<string>? Using the simple for loop with for(int i=0;i<vector.size();i++) works; however, I've also read about using 'vector::iterator' to initilize vector step thrus.

Is it possible to put my vector into a two dimentional char array to manipulate or search the data. Is it possible to do this searching directly on the vector, by making a struct of the knowns elements and then vector<struct name>?

As you can see, I've reached the new user overload. Pointing me in a starting direction would be great and thanks for your help.

#include <iostream>
#include <fstream>
#include <string>
#include <vector>
using namespace std;
 
int main () {
    vector<string> AllReadyReadin;
    // typedef vector<double>::size_type vector_sizeVariable;
    char filename[81];
    string input_line;
 
    cout << "Enter Filename to read: ";
    cin >> filename;
 
    // cout << "name of file to read is: " << filename << endl;
 
    //open file and see if it exsists
    ifstream file_toread(filename);
 
    if (!file_toread.is_open()) {
        cout << filename << " Could not be opened. " << endl;
        return -1;
    }
 
    while (!file_toread.eof()) {
 
    getline(file_toread, input_line);
    //temp check of file contents
    //cout << input_line << endl;
    AllReadyReadin.push_back(input_line);
    }    
    file_toread.close();
 
    //various ways to print out size of array
 
    //vector_sizeVariable size = AllReadyReadin.size();
    //cout << "Read in " << size << " lines" << endl;
 
    // cout << "Read in " << AllReadyReadin.size() << " lines" << endl;
 
    //dump vector to check contents
        //for(int i = 0;i < AllReadyReadin.size(); i++)
    //    cout << AllReadyReadin[i] << endl;
 
    return 0;
 
}

HI,
1)You can iterators to iterate through the vectors.
syntax is

  vector<string> str_vect;
  vector<string>::const_iterator str_iter;
  for(str_iter=str_vect.begin();str_iter!=str_vect.end();++str_iter)
  {
      \\*str_iter will have one stored line.
  }
 

2)You can aslo use vector to store the structure

Thanks
Raghuram

[Etrex]

Thank you :)

I can loop thru a vector using a normal index.
Also I can loop thru a vector using a vector<type>::const_iterator that represents an address within a vector for use with *.

Now to stuff the vector into an array for information parsing and gathering.

bob

[gpraghuram]

Thank you :)

I can loop thru a vector using a normal index.
Also I can loop thru a vector using a vector<type>::const_iterator that represents an address within a vector for use with *.

Now to stuff the vector into an array for information parsing and gathering.

bob

Hi,
R u asking for more help or u are describing the task you are about to do?

Thanks
Raghuram

[Etrex]

Sorry was thinking out loud with last post :).

What it boils down to is, I want to have access to individual columns contained within the file with the ability to search by protocol, local IP etc The file has the form of the following on each line, each column entry is seperated by a whitespace:

struct mystruct {
    char date[10];
    char time[11];
    char direction[1];
    char remoteip[15];
    char remoteport[5];
    char localip[15];
    char localport[5];
    char protocol[3];
};

The file is of type string with unknown length. I started by reading the file into a vector<string> to understand the basics of reading / writing from a vector. It would be nice if while reading in the file into a vector, the columns would be parsed into individual accessable names (mystruct) or After reading in the file into a string vector, put the information into a searchable struct.

This idea of making my firewall logs searchable is the reason I took up c++. I am currently reading accelerated c++ and c++ w/o fear and I am 'getting it' so far. I read and do the exercises until my brain screams mercy. I then pop back to this program and delve into online resources to try and figure it out. I believe that once I write the firewall log program, it will be a huge boost to my 'get it' pyschy and change my confused look to a smile heh.

thanks,
bob