?
Solved

Deriving a class from CFileDialog & displaying Open/Save dialog

Posted on 1998-10-19
2
Medium Priority
?
845 Views
Last Modified: 2013-11-20
When creating a dialog based app, I create a new class &
derive it from CFileDialog. I am trying to display the Open & Save dialog, but it doesen't work.  I've asked this question before and followed instructions from Answer2000.
Now I am getting a "unresolved external" error after I build the application. Here is a snippet of my code.
The class declaration is here:


#if !defined(AFX_FILEOPENSAVE_H__76822602_5EB8_11D2_AC74_444553540000__INCLUDED_)
#define AFX_FILEOPENSAVE_H__76822602_5EB8_11D2_AC74_444553540000__INCLUDED_

#if _MSC_VER >= 1000
#pragma once
#endif // _MSC_VER >= 1000
// FileOpenSave.h : header file
/////////////////////////////////////////////////////////////////////////////
// CFileOpenSave dialog

class CFileOpenSave : public CFileDialog
{
      DECLARE_DYNAMIC(CFileOpenSave)

            
public:
      CFileOpenSave(BOOL bOpenFileDialog, // TRUE for FileOpen, FALSE for FileSaveAs
            LPCTSTR lpszDefExt = NULL,
            LPCTSTR lpszFileName = NULL,
            DWORD dwFlags = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,
            LPCTSTR lpszFilter = NULL,
            CWnd* pParentWnd = NULL);
      

     
      CFileOpenSave(); //constructor function declared here

protected:
      //{{AFX_MSG(CFileOpenSave)
      afx_msg void OnFileOpen();
      //}}AFX_MSG
      DECLARE_MESSAGE_MAP()
};
//////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////

The .cpp file is here:

// FileOpenSave.cpp : implementation file
//

#include "stdafx.h"
#include "Table2.h"
#include "FileOpenSave.h"

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

/////////////////////////////////////////////////////////////////////////////
// CFileOpenSave

IMPLEMENT_DYNAMIC(CFileOpenSave, CFileDialog)

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

      

BEGIN_MESSAGE_MAP(CFileOpenSave, CFileDialog)
      //{{AFX_MSG_MAP(CFileOpenSave)
      ON_COMMAND(ID_FILE_OPEN, OnFileOpen)
      //}}AFX_MSG_MAP
END_MESSAGE_MAP()


void CFileOpenSave::OnFileOpen()
{
      
    CFileOpenSave dlgOpSv;
    dlgOpSv.DoModal();

    // TODO: Add your command handler code here
    //This is my problem.  I don't know why it's not     //working!
}


My dialog box has a menu with File|Open, but doesn't create the dialog.  I've included the <afxdlgs.h> file in the stdfx.h f header & still nothing.  The only time
it works is if I create an SDI or MDI app.
If you are out there, please Help, Answers2000.
I've looked in my books to trubleshoot this problem &
in the MFC help.  Still having problems. (Remember,
I'm a beginner...)

0
Comment
Question by:pagz
  • 2
2 Comments
 
LVL 7

Expert Comment

by:psdavis
ID: 1323522
Give us the unresolved error so we can see it!
0
 
LVL 7

Accepted Solution

by:
psdavis earned 100 total points
ID: 1323523
Ahhh... I see it now...

void CFileOpenSave::OnFileOpen()
{
    CFileOpenSave dlgOpSv;
    dlgOpSv.DoModal();
}

You are trying to create the dialog by a function inside of the dialog.  The CFileOpenSave::OnFileOpen doesn't exist yet until the DoModal is run, but the DoModal is inside itself.

You're going to want to run it from a different class...

void CYourDialogBox::OnFileOpen()
{
    CFileOpenSave dlgOpSv;
    dlgOpSv.DoModal();
}

Phillip
0

Featured Post

Upgrade your Question Security!

Your question, your audience. Choose who sees your identity—and your question—with question security.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Here is how to use MFC's automatic Radio Button handling in your dialog boxes and forms.  Beginner programmers usually start with a OnClick handler for each radio button and that's just not the right way to go.  MFC has a very cool system for handli…
Introduction: Finishing the grid – keyboard support for arrow keys to manoeuvre, entering the numbers.  The PreTranslateMessage function is to be used to intercept and respond to keyboard events. Continuing from the fourth article about sudoku. …
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
This video tutorial shows you the steps to go through to set up what I believe to be the best email app on the android platform to read Exchange mail.  Get the app on your phone: The first step is to make sure you have the Samsung Email app on your …
Suggested Courses

601 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question