question about ignore()????

This is a discussion on question about ignore()???? within the C++ Programming forums, part of the General Programming Boards category; Hi , I have a question about reading in a file. I have a file that I am reading in ...

  1. #1
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    question about ignore()????

    Hi ,
    I have a question about reading in a file. I have a file that I am reading in that has the format:

    setenv HOST1 somehostname1
    setenv PORT1 someportname1
    setenv HOST2 somehostname2
    setenv PORT2 someportname2


    essentially, I need to be able to store these HOSTS names and PORT numbers, I have used a struct to do this with no problem.

    However, I can't figure out how to be able to ignore the "setenv", I tried ignore(), but it did not work.

    I am not sure of how to do this??Do I use getline, or get and then ignore??

    I want to be able to ignore the "setenv", but then be able to read in the "HOST1 somehostname1"...etc

    Thank you for any help anyone can offer. It is appreciated!

  2. #2
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    char input_str[256]; // for example
    char garbage[50];
    char var1[50];
    char var2[50];

    // Normal file reading into "input_str" array, and then:
    sscanf (input_str, "%s %s %s", garbage, var1, var2);
    // now do something with var1 & var2.

    You may also want to use fscanf

  3. #3
    Code Goddess Prelude's Avatar
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    You can either read an entire line with getline and parse it in your progra, or use the >> operator of the file stream to read everything up to whitespace. Ignoring setenv is only a matter of reading and discarding it, then you can move on to the important things.
    My best code is written with the delete key.

  4. #4
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    Thanks for your help, I'll try it out. Thanks again!

  5. #5
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    Code:
    #include <iostream>
    #include <fstream>
    #include <string>
    using namespace std;
    
    int main()
    {
        string buffer;
        ifstream file("c:/temp/file.txt");
        while( getline(file, buffer) )
        {
            cout << buffer << endl;        
        }
          
        system("PAUSE");
    }
    Now it's only a matter of extracting the three words from the buffer variable. Take a look at the string methods. Also you migh want to take a look at atoi.

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