How to create a .txt file in kernel mode

NTDEV
1

Dear all,

This question maybe is a bit stupid. But I really don’t know which function I should call, if I want to creat a .txt (say mylog.txt) file and access it in the kernel mode.

Thank you very much.
Elton

2

> But I really don’t know which function I should call, if I

want to creat a .txt (say mylog.txt) file and access it in
the kernel mode.

Check out http://www.osr.com/ntinsider/1996/native.htm
and accompanying example: http://www.osr.com/ntinsider/1996/native.zip

This is a user-mode example, but it shows you the use of the native API.
Use the Zw variant of these functions, as documented in the DDK.

Be careful, though. There are a significant number of subtle issues laying
in wait for you (for example: The handle can only be used in the context in
which it was created, you can only call these functions at IRQL
PASSIVE_LEVEL, etc.)

If you are trying to do this to create your own logging, this is not a good
idea. If your code is restricted to, say, XP and later, an excellent idea
might be to use the logging package that’s built into Windows via WMI.

Peter
OSR

3

Hello,
Try calling ZwCreateFile() function.
It will enable you to open/create/rewrite an existing/new file.

Sachin

On Sun, 28 Jul 2002, lidong wrote:

Dear all,

This question maybe is a bit stupid. But I really don’t know which function I should call, if I want to creat a .txt (say mylog.txt) file and access it in the kernel mode.

Thank you very much.
Elton

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