CODEWITHSUNDEEP
c++fileopendialogcfiledialog
Woody20
Woody20

Reputation: 867

CFileDialog: dynamic modification of m_ofn?

C++/MFC, Windows 11. Visual Studio 2022 17.4.3.

I'm using CFileDialog to allow user to chose a file. By creating a new class derived from CFileDialog, I am being notified whenever the user changes directories (folders).

I implemented this so I could control the filter applied to the list of files in the directory. However, I have been unsuccessful in this. Even if I don't change m_ofn, I get an error.

Here is some sample code:

// Caller
#include "Browsing_test.h"
P brTest(true, NULL, NULL, 0, fileTypes);
brTest.BrowseTest();

// Browsing_test.h
class P : CFileDialog
{
public:
    P(BOOL bOpenFileDialog,
        LPCTSTR lpszDefExt = NULL,
        LPCTSTR lpszFileName = NULL,
        DWORD dwFlags = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,
        LPCTSTR lpszFilter = NULL,
        CWnd *pParentWnd = NULL,
        DWORD dwSize = 0,
        BOOL bVistaStyle = TRUE) : CFileDialog(bOpenFileDialog,
            lpszDefExt,
            lpszFileName,
            dwFlags,
            lpszFilter,
            pParentWnd,
            dwSize,
            bVistaStyle) {};

    int BrowseTest(void);

#include "stdafx.h"
#include "Browsing_test.h"

int P::BrowseTest(void)
{
    int resultDebug = (int)DoModal();
    return resultDebug;
}

void P::OnFolderChange()
{
    auto s = GetOFN();       // for modifying m_ofn member of the base class,
                             // but not used in this sample code
    // Add modificatons to m_ofn here
    ApplyOFNToShellDialog(); // Gets assert on updating flags
}

Running this code gives an error in dlgfile.cpp (Microsoft code) at line:

hr = (static_cast<IFileDialog*>(m_pIFileDialog))->SetOptions(dwFlags);

which returns hr = E_UNEXPECTED Catastrophic failure. The value of dwFlags was hex 40.

Upvotes: 0

Views: 131

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