writing a file without overwriting the contents.

Question

4.00/5 (1 vote)

See more:

What code is used to write a file without overwriting the already written content. Taking an example the following code:

C++

using namespace System;
using namespace System::IO;

int main()
{
    //creating the file object data.txt
    FileStream^ fs = gcnew FileStream("data.txt", FileMode::Create);
    StreamWriter^ sw = gcnew StreamWriter(fileName);
    try
    {
        //writing lines from a string and a textbox input
        sw->WriteLine("First Name: "+ this->FnameTextBox->Text);
    }
    //Exception handler
    catch (Exception^)
    {
        Console::WriteLine("data could not be written!");
        fs->Close();
        return -1;
    }
    fs->Close();
    return 0;
}

The above code overwrites the content of the file data.txt.
What code should I add in order to write new content starting from the next line of the text file?

Thanx in advance for any help that you'll give me.

Posted 29-Apr-11 5:18am

macdonaldgeek

Updated 29-Apr-11 5:24am

Manfred Rudolf Bihy

v2

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Manfred Rudolf Bihy · Accepted Answer · 2011-04-29T05:24:00

A proper combination of FileModes should do the trick. Read about it here: http://msdn.microsoft.com/de-de/library/system.io.filemode(v=VS.80).aspx[^]

C#

using namespace System;
using namespace System::IO;

int main()
{
    // Writing the file object data.txt
    // FileMode::Append only in combination with FileMod::Write
    FileStream^ fs = gcnew FileStream("data.txt", FileMode::Write | FileMode::Append);
    StreamWriter^ sw = gcnew StreamWriter(fileName);
    try
    {
        //writing lines from a string and a textbox input
        sw->WriteLine("First Name: "+ this->FnameTextBox->Text);
    }
    //Exception handler
    catch (Exception^)
    {
        Console::WriteLine("data could not be written!");
        fs->Close();
        return -1;
    }
    fs->Close();
    return 0;
}

Best Regards,

-MRB

HimanshuJoshi · Accepted Answer · 2011-04-29T05:27:00

Solution 2

Change

FileStream^ fs = gcnew FileStream("data.txt", FileMode::Create);

to

FileStream^ fs = gcnew FileStream(&quot;data.txt&quot;, FileMode::Append | FileMode::Write);

In other words, open your file in append mode will allow you to write it at end of file.

Posted 29-Apr-11 5:27am

HimanshuJoshi

Updated 29-Apr-11 5:28am

v3

Comments

Joan M 29-Apr-11 11:31am

simple and direct... my 5.

HimanshuJoshi 29-Apr-11 12:04pm

Thanks.

Albert Holguin 29-Apr-11 14:12pm

less clutter... :)

HimanshuJoshi 2-May-11 9:49am

Thanks!

Manfred Rudolf Bihy 2-May-11 6:34am

My 5!