?? dir_dialog.shtml
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<TITLE>Dialog - Class to select directory</TITLE>
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<FONT COLOR="#AOAO99">Class to select directory</FONT></H3></CENTER>
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<p>This article was contributed by <A HREF="mailto:Girish_Bharadwaj@Pictel.com">Girish Bharadwaj</A>. Lot of you may recognize
him from the lots of helpful posts on the mfc usenet groups.
<p>CDirDialog : this class encapsulates the SHBrowseForFolder API. You can
use this class to browse for folders. I had seen many posting asking this
question. So, I put together this small wrapper class. In order to use it ,
Set the title by setting the text in m_strTitle. If you dont set this the
title will have "Open".
<p>Set the initial directory to start from using m_strInitDir. If you dont set
this, it will start from desktop.
<p>Then call DoBrowse (). If it returns TRUE, you can see the m_strPath for
the selected directory. If it returns FALSE, user has dismissed the dialog
with a cancel OR there was some problem retrieving the folder. I have not
put in any error code. If, somebody wants to they are welcome to do it.
<PRE><TT><FONT COLOR="#990000">
////////////////////////////////////////////////////////////////////////
// DirDialog.h: interface for the CDirDialog class.
//
//////////////////////////////////////////////////////////////////////
#if
!defined(AFX_DIRDIALOG_H__62FFAC92_1DEE_11D1_B87A_0060979CDF6D__INCLUDED_)
#define AFX_DIRDIALOG_H__62FFAC92_1DEE_11D1_B87A_0060979CDF6D__INCLUDED_
#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000
class CDirDialog
{
public:
CDirDialog();
virtual ~CDirDialog();
int DoBrowse ();
CString m_strPath;
CString m_strInitDir;
CString m_strTitle;
int m_iImageIndex;
};
#endif //
!defined(AFX_DIRDIALOG_H__62FFAC92_1DEE_11D1_B87A_0060979CDF6D__INCLUDED_)
///////////////////////////////////////////////////////////////////////////
// DirDialog.cpp: implementation of the CDirDialog class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "DirDialog.h"
#include "shlobj.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CDirDialog::CDirDialog()
{////////////////////////////////////////////
}
CDirDialog::~CDirDialog()
{///////////////////////////////////////////
}
int CDirDialog::DoBrowse ()
{/////////////////////////////////////////
LPMALLOC pMalloc;
if (SHGetMalloc (&pMalloc)!= NOERROR)
{
return 0;
}
BROWSEINFO bInfo;
LPITEMIDLIST pidl;
ZeroMemory ( (PVOID) &bInfo,sizeof (BROWSEINFO));
if (!m_strInitDir.IsEmpty ())
{
OLECHAR olePath[MAX_PATH];
ULONG chEaten;
ULONG dwAttributes;
HRESULT hr;
LPSHELLFOLDER pDesktopFolder;
// // Get a pointer to the Desktop's IShellFolder interface. //
if (SUCCEEDED(SHGetDesktopFolder(&pDesktopFolder)))
{
//
// IShellFolder::ParseDisplayName requires the file name be in Unicode.
//
MultiByteToWideChar(CP_ACP, MB_PRECOMPOSED, m_strInitDir.GetBuffer (MAX_PATH), -1,
olePath, MAX_PATH);
m_strInitDir.ReleaseBuffer (-1);
//
// Convert the path to an ITEMIDLIST.
//
hr = pDesktopFolder->ParseDisplayName(NULL,
NULL,
olePath,
&chEaten,
&pidl,
&dwAttributes);
if (FAILED(hr))
{
pMalloc ->Free (pidl);
pMalloc ->Release ();
return 0;
}
bInfo.pidlRoot = pidl;
}
}
bInfo.hwndOwner = NULL;
bInfo.pszDisplayName = m_strPath.GetBuffer (MAX_PATH);
bInfo.lpszTitle = (m_strTitle.IsEmpty()) ? "Open":m_strTitle;
bInfo.ulFlags = BIF_RETURNFSANCESTORS|BIF_RETURNONLYFSDIRS;
if ((pidl = ::SHBrowseForFolder (&bInfo)) == NULL)
{
return 0;
}
m_strPath.ReleaseBuffer ();
m_iImageIndex = bInfo.iImage;
if (::SHGetPathFromIDList(pidl,m_strPath.GetBuffer (MAX_PATH)) == FALSE)
{
pMalloc ->Free (pidl);
pMalloc ->Release ();
return 0;
}
m_strPath.ReleaseBuffer ();
pMalloc ->Free (pidl);
pMalloc ->Release ();
return 1;
}
</FONT></TT></PRE>
<h3>Enhancement</h3>
This enhancement was sent by <A HREF="mailto:Lars.Klose@studbox.uni-stuttgart.de">Lars Klose</A>.
<P>I downloaded Girish Bharadwaj's wrapper class for SHBrowseForFolder,
CDirDialog, a few days ago. Because it seems useful to me to set the
selected folder to a default value other than 'desktop' when the
dialog opens, I extended Girish Bharadwaj's implementation with a
callback function that sets the selected folder when the dialog is
initialized. It's set to the value stored in the new member variable
m_strSelDir or defaults to 'desktop' if m_strSelDir was not set.
The attached zip contains the changed files DirDialog.h and .cpp.
<P><A HREF="DirDlg.zip">Download file (2KB)</A>
<P>
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