how to export the computer time to text file without overwriting C++

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I want to write a C++ programmer to:

1. record the computer time when user click on the mouse
2. export the time to a file ( .txt)
3. update the file

For the first part, I have tried out:

C++

#include <time.h>
#include <stdio.h>
#include <iostream>
#include <fstream>
using namespace std;

int main()
{   //string record;

char key;

    ofstream fout;
    ifstream fin;

fin.open ("text.txt");
fout.open ("text1.txt");
    while(1){
        cin>>key;
             if (key=='a')
             {time_t currentTime = time(0);
               
               printf("The Current Time is %s", ctime(¤tTime));  
  
               fout << ctime(¤tTime);
                  
                 key=='0';

 
                       }
                       if (key =='b')
                       break;
                       }
                       fout.close();
system("PAUSE");
  return 0;
}

But every time I restart the .exe, the .txt file is overwriten,
I need to keep the old data and update/insert the new data.

Thanks

Posted 16-Dec-12 2:46am

Member 9689332

Updated 17-Dec-12 4:52am

André Kraak

v4

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Jibesh · Accepted Answer · 2012-12-16T03:36:00

Solution 1

You can use the file stream classes to read/write files.

Input/Output files using C++[^]

C++

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

int main () {
  ofstream myfile;
  myfile.open ("example.txt");
  myfile << "Writing this to a file.\n";
  myfile.close();
  return 0;
}

Posted 16-Dec-12 3:36am

Jibesh

v2

Comments

Quirkafleeg 17-Dec-12 7:15am

+5. A rare occasion when a C++ question is answered using C++, rather than C!

Jibesh 17-Dec-12 14:50pm

Thanks. Quirkafleeg.

Member 9689332 17-Dec-12 8:41am

I can output the time but when I update the time, the old time is overwrote.
How can I update the new time into a new line?

Jibesh 17-Dec-12 14:55pm

Did you check the link i provided in my solution. you need to open a file with append flag on.
eg:

ofstream myfile;
myfile.open ("example.bin", ios::out | ios::app | ios::binary);

os::app All output operations are performed at the end of the file, appending the content to the current content of the file. This flag can only be used in streams open for output-only operations.

Read the link carefully you will get the solution.