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Posted 28 Jan 2010

Disabling Windows file system redirection on a CFileDialog

, 24 Apr 2010
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Introduction...

Introduction


Windows on Windows 64-bit (WOW64) provides file system redirection. In a 64-bit version of Windows Server 2003 or of Windows XP, the %WinDir%\System32 folder is reserved for 64-bit applications. When a 32-bit application tries to access the System32 folder, access is redirected to the following folder:
%WinDir%\SysWOW64
By default, file system redirection is enabled.

Background


You can use the following functions to control file system redirection:

  • Wow64DisableWow64FsRedirection
  • Wow64EnableWow64FsRedirection
  • Wow64RevertWow64FsRedirection

The problem is that it is disabled on the current thread. Hence I faced a problem where I could not use CFileDialog Box to access the System32 folder. I searched on the net and could not find an article, so here goes my first article :)

Using the Code


You should derive a class from CFileDialog. And in the constructor, disable the flags and enable it back again in the destructor :)

class CFileDialogEx :	public CFileDialog
{
public:
	CFileDialogEx(void);
	~CFileDialogEx(void);
private:
	PVOID OldValue;
}; 
 
CFileDialogEx::CFileDialogEx(void):CFileDialog(true)
{
	Wow64DisableWow64FsRedirection(&OldValue);
}
 
CFileDialogEx::~CFileDialogEx(void)
{
	Wow64RevertWow64FsRedirection(OldValue);
}

License

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

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About the Author

Kartik Sura
Software Developer
India India
This member doesn't quite have enough reputation to be able to display their biography and homepage.

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Comments and Discussions

 
GeneralReason for my vote of 5 Good Document Pin
Gyu-Sang Cho7-Feb-11 8:44
memberGyu-Sang Cho7-Feb-11 8:44 
Generaldoes not work on post vista Pin
Kartik Sura27-May-10 20:38
memberKartik Sura27-May-10 20:38 

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