CODEWITHSUNDEEP
c++filefstream
Kryston
Kryston

Reputation: 185

If file exist, work with it, if no, create it

fstream datoteka;
datoteka.open("Informacije.txt",  fstream::in | fstream::out | fstream::app);

if(!datoteka.is_open()){              
    ifstream datoteka("Informacije.txt")
    datoteka.open("my_file.txt", fstream::in | fstream::out | fstream::app);
}/*I'm writing IN the file outside of that if statement.

So what it should do is create a file if it was not created before, and if it is created write into that file.

Hello there, so what I wanted from my program is that it check if the file already exists, sothe program open if it does and I can write in it, if the file is not opened(have not been created before) the program create it. So the problem is when I create a .csv file, and finish writing and I wanted to check if the written is really there, the file cannot be opened. In .txt file, everything is blank.

Upvotes: 16

Views: 65889

Answers (2)

user9385340
user9385340

Reputation:

If filename does not exist, the file is created. Otherwise, the fstream::app, If file filename already exists, append the data to the file instead of overwriting it.

int writeOnfile (char* filetext) {
       ofstream myfile;
       myfile.open ("checkSellExit_file_output.csv", fstream::app);
       myfile << filetext;
       myfile.close();
       return 0;
    }

Upvotes: 7

Software_Designer
Software_Designer

Reputation: 8587

datoteka.open(filename, std::fstream::in | std::fstream::out | std::fstream::app); works fine.

#include <fstream>
#include <iostream>
using namespace std;

int main(void)
{

     char filename[ ] = "Informacije.txt";
     fstream appendFileToWorkWith;

     appendFileToWorkWith.open(filename, std::fstream::in | std::fstream::out | std::fstream::app);


      // If file does not exist, Create new file
      if (!appendFileToWorkWith ) 
      {
        cout << "Cannot open file, file does not exist. Creating new file..";

        appendFileToWorkWith.open(filename,  fstream::in | fstream::out | fstream::trunc);
        appendFileToWorkWith <<"\n";
        appendFileToWorkWith.close();

       } 
      else   
      {    // use existing file
         cout<<"success "<<filename <<" found. \n";
         cout<<"\nAppending writing and working with existing file"<<"\n---\n";

         appendFileToWorkWith << "Appending writing and working with existing file"<<"\n---\n";
         appendFileToWorkWith.close();
         cout<<"\n";

    }




   return 0;
}

Upvotes: 16

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