writing a file without overwriting the contents.

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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

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2 solutions

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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!

HimanshuJoshi 2-May-11 9:49am

Thanks!

writing a file without overwriting the contents.

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writing a file without overwriting the contents.

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