Thread: Reading and appending text files

So I am starting to create a program that will be a multi step process. The principle is that the programming I am creating is to help our field engineers quickly add some lines to an text file that our main program uses for settings. I want to take the text file and append it to a new file until the line <settings> is found. From there I will do another step to append the new lines need then continue, but I am stuck on getting it to go into the array up to that line and to be honest I am not sure where to begin. I've been looking through the net but brain is now mush. Any advice, help, suggestions or examples would be appreciated.

Thanks,
Vendetto

Let me try to explain in simple words:

Code:

1. open a stream for reading
2. open a stream for output
    while reading a line from input
       if line doesn't start with <settings> then   
          write line to output.
       end-if
    end-while
3. now append the new stuff to output
4. while reading a line from input
       write line to output
    end-while

If you don't know about std::ifstream and std:fstream have a look at https://www.learncpp.com/cpp-tutorial/186-basic-file-io/

Hope this gives you an idea how to start

Start? Where is YOUR code?

Thanks thmm!!!

That did help me get started. Here is where I am so far:

Code:

//

#include <fstream>
#include <iostream>
#include <string>
#include <stdio.h>
#include <Windows.h>

int main()
{
    int results;
    char oldname[] = "c:\\synergyii\\config\\clientconfig.xml";
    char newname[] = "c:\\synergyii\\config\\clientconfig.txt";
    results = rename(oldname, newname);
    if (results == 0)
        puts("File successfully renamed");
    else
        perror("Error renaming file");


    
    std::ifstream inf{ "c:\\synergyii\\config\\clientconfig.txt" };


    std::fstream outf{ "c:\\synergyii\\config\\clientconfig.xml" };


    if (!inf)
    {
        std::cerr << "Cannot open client config for reading" << std::endl;
        return 1;
    }

    if (!outf)
    {
        std::cerr << "Cannot open client config for writing" << std::endl;
        return 1;
    }

    while (inf)
    {

        std::string line;
line.assign("</settings>");


        std::string strInput;
        std::getline(inf, strInput);


        if (strInput !=  line)
        {
            outf << inf.rdbuf();
        }

    }

    return 0;


}

I am running into 2 problems.

1. The first line of the text document is being cut off when it runs. Everything else copies.
2. The if statement is not working. It is still reading and appending to the end of the file.

I know there isn't much here yet but I am building on it. I think I need to have an else statement in there but not sure. I just want it to get to the line that is </settings> and stop the reading of that inf and close it. Then I will open another and do the process again and so forth until a new xml is built.

Like I said, any help or advice is appreciated.

Thanks,
Vendetto

Ok so the programming is working great. I got around all my issues. However, I am now looking for a way for the program to check the lines in "newline.txt" and see if they are duplicates of the ones in the output file and if so, do not copy them. Any suggestions?

Code:

//


#include <fstream>
#include <iostream>
#include <string>
#include <stdio.h>
#include <Windows.h>


int main()
{
    int results;
    char oldname[] = "c:\\synergyii\\config\\clientconfig.xml";
    char newname[] = "c:\\synergyii\\config\\clientconfig.txt";
    results = rename(oldname, newname);
    if (results == 0)
        puts("File successfully renamed");
    else
        perror("Error renaming file");


    
    std::ifstream inf{ "c:\\synergyii\\config\\clientconfig.txt" };


    std::ofstream outf{ "c:\\synergyii\\config\\clientconfig.xml" };


    if (!inf)
    {
        std::cerr << "Cannot open client config for reading" << std::endl;
        return 1;
    }


    if (!outf)
    {
        std::cerr << "Cannot open client config for writing" << std::endl;
        return 1;
    }


    std::string line{ "</settings>" };
    std::string strInput;


    while (std::getline(inf, strInput))
    {
        if (strInput == line)
        {
            break;
        }
   
        else 
        {
            outf << strInput << '\n';
        }


    }


    inf.close();


    std::ifstream inf2{ "c:\\synergyii\\config\\newlines.txt" };


    if (!inf2)
    {
        std::cerr << "Cannot open client config for reading" << std::endl;
        return 1;
    }


    while (std::getline(inf2, strInput))
    {
        outf << strInput << '\n';
    }


    inf2.close();


    outf << "</settings>" << '\n';
    outf << "</config>" << '\n';


    outf.close();


    return 0;
}

Thanks,
V