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Writing to system32 folder

Posted on 2010-08-28
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Last Modified: 2012-05-10
I am working with an application that is installed as a DLL on the system (stealth program for parents to install where a teenager can't go looking for it, etc.). Therefore I need to store a few files in an accessible location that is out of sight. System32 seems the most logical place for these few files.

The problem is in my C# application running on Windows 7 x64 even with UAC rights passed to the application (run as Admin) a file or folder is never created. I don't get an exception at all either, which is very odd to me. It is as though the file creation is ignored.

How can I write a file to system32 in C#?
System.IO.Directory.CreateDirectory(Environment.GetFolderPath(Environment.SpecialFolder.System) + @"\tcIq");
            FileStream fout = new FileStream(Environment.GetFolderPath(Environment.SpecialFolder.System) + @"\tcIq\test.reg", 
                                            FileMode.OpenOrCreate, FileAccess.Write);
            fout.WriteByte(0);
            fout.Close();

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Question by:mwdman
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6 Comments
 
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Accepted Solution

by:
Vikram Singh Saini earned 2000 total points
ID: 33551229
Hi,

Please check code. I tried with WriteByte(0); but it didn't work. I don't know why.


Regards,
VSS

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;

namespace ee_Write_to_System32
{
    public partial class Form1 : Form
    {
        string filePath = System.Environment.GetFolderPath(Environment.SpecialFolder.System) + @"\Test\testreport.reg";
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string folderPath = Environment.GetFolderPath(Environment.SpecialFolder.System) + @"\Test";
            Directory.CreateDirectory(folderPath);
            
            FileStream fs = new FileStream(filePath, FileMode.Append, FileAccess.Write, FileShare.ReadWrite);

            StreamWriter sw = new StreamWriter(fs, Encoding.UTF8);
            sw.WriteLine(textBox1.Text);

            if (File.Exists(filePath))
            {
                MessageBox.Show("Wow! File created");
            }

            sw.Close();
            fs.Close();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            if (File.Exists(filePath))
            {
                StreamReader sr= File.OpenText(filePath);

                while (sr.Peek()!=-1)
                {
                    textBox2.Text = sr.ReadLine();
                }

                sr.Close();
            }
        }
    }
}

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Expert Comment

by:John Hurst
ID: 33551254
Are you sure the UAC rights are correct. You need to be a member of the administrators group and have elevated UAC rights to write to the system32 folder (at least to the folders in there that I access and make changes to).
... Thinkpads_User
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Author Comment

by:mwdman
ID: 33551458
The code was helpful to see the file was actually being created and caused me to look further into the problem. It appears the file was being created in C:\Windows\SysWOW64\Test2 even thought the path was C:\Windows\System32

Strange but at least I know the issue now.
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LVL 16

Expert Comment

by:Vikram Singh Saini
ID: 33551465
Hi,

It appears the file was being created in C:\Windows\SysWOW64\Test2 even  thought the path was C:\Windows\System32

But how the file was being created at C:\Windows\SysWOW64\Test2 ? Please share

Thanks and Regards,
VSS
0
 

Author Comment

by:mwdman
ID: 33551480
If I do

MessageBox.Show(Environment.SpecialFolder.System);

It shows C:\Windows\System32

But when I write a file it does to:
C:\windows\SysWOW64

Which is why it appeared to not be working, but in fact was just working differently then expected.

I suspect .NET framework which handles the file IO changes the write location since I'm on a 64-bit OS and that part of the .NET framework is maybe 64-bit (as my app is compiled as x86). I verfied this by writing a C++ program in native code and it wrote to system32... So it is indeed an oddity to the .NET framework maybe something new in VS2010, not sure.
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LVL 16

Expert Comment

by:Vikram Singh Saini
ID: 33551485
Hi,

Thanks for sharing Interesting piece of information.

Regards,
VSS
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