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Windows 2000 style File Dialog box

Posted on 2002-05-18
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Last Modified: 2013-11-20
I'm just starting out with MFC and I'm wondering if there is a way to display the Win 2000 style dialog box instead of using the older style.

Here is the code I am using now:


void CSTUploadDoc::OnDataImport()
{
     TCHAR buffer[] = _T("Dat Files (*.dat)|*.dat|All Files (*.*)|*.*||");
     CFileDialog dlg(TRUE, _T("dat"), _T("*dat"), OFN_FILEMUSTEXIST, buffer);

     if (dlg.DoModal() == IDOK) {
          try {
               CStdioFile f(dlg.GetPathName(),CFile::modeReadWrite);
               LoadData(f);
          }
          catch (CFileException *e) {
               e->ReportError();
               e->Delete();
          }
     }
}




Any help would be greatly appreciated.
Thx.
0
Comment
Question by:boomshanker
  • 2
  • 2
4 Comments
 
LVL 12

Expert Comment

by:migel
ID: 7019374
Hi!
To use Win2K style dialog you have to set correct CFileDialog.m_ofn.lStructSize = sizeof(lStructSize)+3*sizeof(DWORD);
before calling DoModal;
I assume that your project doesn`t contain defines such as
_WIN32_WINNT = 0x0500;
0
 
LVL 1

Author Comment

by:boomshanker
ID: 7019902
Thanks for your response.

Could you possibly show me how to implement that with the code I have?

If I use the code you supplied as follows:

dlg.m_ofn.lStructSize = sizeof(lStructSize)+3*sizeof(DWORD);

I get an "lStructSize Undeclared Identifier" error upon compile.

How do I declare lStructSize?  Do I have to set any other data members of the struct?

Thank you in advance for any further help you may offer.
0
 
LVL 12

Accepted Solution

by:
migel earned 100 total points
ID: 7019956
Hi!
excuse me for this dirty CRACKed code :-)
this method can arise Access Violation  error and ugly bechavior.
Here is true code.
///BOF
// FileDialogEx.h

#pragma once

// Windows 2000 version of OPENFILENAME.
// The new version has three extra members.
// This is copied from commdlg.h
struct OPENFILENAMEEX : public OPENFILENAME {
  void *        pvReserved;
  DWORD         dwReserved;
  DWORD         FlagsEx;
};

///////////////////////////////////////////////////////////////////////////
// CFileDialogEx: Encapsulate Windows-2000 style open dialog.
class CFileDialogEx : public CFileDialog {
      DECLARE_DYNAMIC(CFileDialogEx)
public:
      CFileDialogEx(BOOL bOpenFileDialog, // TRUE for open,
                                          // FALSE for FileSaveAs
      LPCTSTR lpszDefExt = NULL,
      LPCTSTR lpszFileName = NULL,
      DWORD dwFlags = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,
      LPCTSTR lpszFilter = NULL,
      CWnd* pParentWnd = NULL);

   // override
   virtual int DoModal();

protected:
   OPENFILENAMEEX m_ofnEx; // new Windows 2000 version of OPENFILENAME

   virtual BOOL OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult);

   // virtual fns that handle various notifications
   virtual BOOL OnFileNameOK();
   virtual void OnInitDone();
   virtual void OnFileNameChange();
   virtual void OnFolderChange();
   virtual void OnTypeChange();

   DECLARE_MESSAGE_MAP()
   //{{AFX_MSG(CFileDialogEx)
   //}}AFX_MSG
};
//EOF

///BOF
///FileDialogEx.cpp


#include "stdafx.h"
#include <afxpriv.h>
#include "FileDialogEx.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

static BOOL IsWin2000();

///////////////////////////////////////////////////////////////////////////
// CFileDialogEx

IMPLEMENT_DYNAMIC(CFileDialogEx, CFileDialog)

CFileDialogEx::CFileDialogEx(BOOL bOpenFileDialog,
   LPCTSTR lpszDefExt,
   LPCTSTR lpszFileName,
   DWORD dwFlags, LPCTSTR lpszFilter, CWnd* pParentWnd) :
   CFileDialog(bOpenFileDialog, lpszDefExt, lpszFileName,
      dwFlags, lpszFilter, pParentWnd)
{
}

BEGIN_MESSAGE_MAP(CFileDialogEx, CFileDialog)
   //{{AFX_MSG_MAP(CFileDialogEx)
   //}}AFX_MSG_MAP
END_MESSAGE_MAP()

BOOL IsWin2000()
{
   OSVERSIONINFOEX osvi;
   BOOL bOsVersionInfoEx;

   // Try calling GetVersionEx using the OSVERSIONINFOEX structure,
   // which is supported on Windows 2000.
   //
   // If that fails, try using the OSVERSIONINFO structure.

   ZeroMemory(&osvi, sizeof(OSVERSIONINFOEX));
   osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFOEX);

   if( !(bOsVersionInfoEx = GetVersionEx ((OSVERSIONINFO *) &osvi)) )
   {
      // If OSVERSIONINFOEX doesn't work, try OSVERSIONINFO.

      osvi.dwOSVersionInfoSize = sizeof (OSVERSIONINFO);
      if (! GetVersionEx ( (OSVERSIONINFO *) &osvi) )
         return FALSE;
   }

   switch (osvi.dwPlatformId)
   {
      case VER_PLATFORM_WIN32_NT:

         if ( osvi.dwMajorVersion >= 5 )
            return TRUE;

         break;
   }
   return FALSE;
}

int CFileDialogEx::DoModal()
{
   ASSERT_VALID(this);
   ASSERT(m_ofn.Flags & OFN_ENABLEHOOK);
   ASSERT(m_ofn.lpfnHook != NULL); // can still be a user hook

   // zero out the file buffer for consistent parsing later
   ASSERT(AfxIsValidAddress(m_ofn.lpstrFile, m_ofn.nMaxFile));
   DWORD nOffset = lstrlen(m_ofn.lpstrFile)+1;
   ASSERT(nOffset <= m_ofn.nMaxFile);
   memset(m_ofn.lpstrFile+nOffset, 0,
         (m_ofn.nMaxFile-nOffset)*sizeof(TCHAR));

   // WINBUG: This is a special case for the file open/save dialog,
   //  which sometimes pumps while it is coming up but before it has
   //  disabled the main window.
   HWND hWndFocus = ::GetFocus();
   BOOL bEnableParent = FALSE;
   m_ofn.hwndOwner = PreModal();
   AfxUnhookWindowCreate();
   if (m_ofn.hwndOwner != NULL && ::IsWindowEnabled(m_ofn.hwndOwner))
   {
      bEnableParent = TRUE;
      ::EnableWindow(m_ofn.hwndOwner, FALSE);
   }

   _AFX_THREAD_STATE* pThreadState = AfxGetThreadState();
   ASSERT(pThreadState->m_pAlternateWndInit == NULL);

   if (m_ofn.Flags & OFN_EXPLORER)
      pThreadState->m_pAlternateWndInit = this;
   else
      AfxHookWindowCreate(this);

   memset(&m_ofnEx, 0, sizeof(m_ofnEx));
   memcpy(&m_ofnEx, &m_ofn, sizeof(m_ofn));
   if (IsWin2000())
      m_ofnEx.lStructSize = sizeof(m_ofnEx);

   int nResult;
   if (m_bOpenFileDialog)
      nResult = ::GetOpenFileName((OPENFILENAME*)&m_ofnEx);
   else
      nResult = ::GetSaveFileName((OPENFILENAME*)&m_ofnEx);

   memcpy(&m_ofn, &m_ofnEx, sizeof(m_ofn));
   m_ofn.lStructSize = sizeof(m_ofn);

   if (nResult)
      ASSERT(pThreadState->m_pAlternateWndInit == NULL);
   pThreadState->m_pAlternateWndInit = NULL;

   // WINBUG: Second part of special case for file open/save dialog.
   if (bEnableParent)
      ::EnableWindow(m_ofnEx.hwndOwner, TRUE);
   if (::IsWindow(hWndFocus))
      ::SetFocus(hWndFocus);

   PostModal();
   return nResult ? nResult : IDCANCEL;
}

BOOL CFileDialogEx::OnNotify(WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
   memcpy(&m_ofn, &m_ofnEx, sizeof(m_ofn));
   m_ofn.lStructSize = sizeof(m_ofn);

   return CFileDialog::OnNotify( wParam, lParam, pResult);
}

////////////////////////////////////////////////////////////////
// The following functions are provided just to demonstrate that they
// get called; ie, that MFC's internal dialog proc is in fact hooked
// up. You can delete them if you like.
//
BOOL CFileDialogEx::OnFileNameOK()
{
   TRACE(_T("CFileDialogEx::OnFileNameOK\n"));
   return CFileDialog::OnFileNameOK();
}

void CFileDialogEx::OnInitDone()
{
   TRACE(_T("CFileDialogEx::OnInitDone\n"));
   CFileDialog::OnInitDone();
}

void CFileDialogEx::OnFileNameChange()
{
   TRACE(_T("CFileDialogEx::OnFileNameChange\n"));
   CFileDialog::OnFileNameChange();
}

void CFileDialogEx::OnFolderChange()
{
   TRACE(_T("CFileDialogEx::OnFolderChange\n"));
   CFileDialog::OnFolderChange();
}

void CFileDialogEx::OnTypeChange()
{
   TRACE(_T("OnTypeChange(), index = %d\n"), m_ofn.nFilterIndex);
   CFileDialog::OnTypeChange();
}

// EOF
Just add these 2 files into the your project and

replace CFileDialog to the CFileDialogEx in the your code.
Good Luck!
0
 
LVL 1

Author Comment

by:boomshanker
ID: 7020162
That's great!

Thank you so much for your help, and your quick response.
Much appreciated.
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