CFileDialog :: Browse folders

问题:

When I try to instantiate a CFileDialog object it shows both the folders and files. How do you create a CFileDialog that browses for folders alone?

回答1:

You can't do it with CFileDialog.

Either you will use SHBrowseForFolder Function or a wrapper for it,
like CFolderDialog - Selecting Folders.

回答2:

It is very simple, really.

Use CFolderPickerDialog which is derived from the class CFileDialog!

回答3:

Starting from Vista it's recommended to use IFileDialog with the FOS_PICKFOLDERS option (see msdn):

CFileDialog od(TRUE/*bOpenFileDialog*/, NULL, NULL,
      OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT , NULL, NULL, 0,
      TRUE/*bVistaStyle*/);
   IFileOpenDialog * openDlgPtr = od.GetIFileOpenDialog();
   if ( openDlgPtr != NULL )
   {
      openDlgPtr->SetOptions(FOS_PICKFOLDERS);
      openDlgPtr->Release();
   }

   od.DoModal();

回答4:

Like someone mentioned, use CFolderPickerDialog which works great. I would like to give you example how to use it especially when using the multi select flag:

CFolderPickerDialog folderPickerDialog(initialFolder, OFN_FILEMUSTEXIST | OFN_ALLOWMULTISELECT | OFN_ENABLESIZING, this,
        sizeof(OPENFILENAME));

    CString folderPath;

    if (folderPickerDialog.DoModal() == IDOK)
    {

        POSITION pos = folderPickerDialog.GetStartPosition();

        while (pos)
        {
            folderPath = folderPickerDialog.GetNextPathName(pos);

        }
    }

回答5:

starting from windows vista,you can use the Common Item Dialog .

void CQiliRegrvDlg::OnBnClickedSelectDir()
{
HRESULT hr = S_OK;

// Create a new common open file dialog.
IFileOpenDialog *pfd = NULL;
hr = CoCreateInstance(CLSID_FileOpenDialog, NULL, CLSCTX_INPROC_SERVER,
    IID_PPV_ARGS(&pfd));
if (SUCCEEDED(hr))
{
    // Set the dialog as a folder picker.
    DWORD dwOptions;
    hr = pfd->GetOptions(&dwOptions);
    if (SUCCEEDED(hr))
    {
        hr = pfd->SetOptions(dwOptions | FOS_PICKFOLDERS);
    }

    // Set the title of the dialog.
    if (SUCCEEDED(hr))
    {
        hr = pfd->SetTitle(L"Folder");
    }
    // Show the open file dialog.
    if (SUCCEEDED(hr))
    {
        hr = pfd->Show(m_hWnd);
        if (SUCCEEDED(hr))
        {
            // Get the selection from the user.
            IShellItem *psiResult = NULL;
            hr = pfd->GetResult(&psiResult);
            if (SUCCEEDED(hr))
            {
                PWSTR pszPath = NULL;
                hr = psiResult->GetDisplayName(SIGDN_FILESYSPATH, &pszPath);
                if (SUCCEEDED(hr))
                {
                    m_appDir = pszPath;
                    SetDlgItemText(IDC_STATIC, m_appDir);
                    CoTaskMemFree(pszPath);
                }
                psiResult->Release();
            }
        }
    }

    pfd->Release();
  }
  }

回答6:

Seems to me the answer you are asking for is inside the code of

CMFCPropertyGridFileProperty::OnClickButton(CPoint /*point*/)

of the

<Your Visual Studio installation folder>\VC\atlmfc\src\mfc\afxpropertygridctrl.cpp

file.

If you do not have access to the code, I will post the essential part of it:

CString strPath = m_varValue.bstrVal;
BOOL bUpdate = FALSE;

if (m_bIsFolder)
{
    if (afxShellManager == NULL)
    {
        CWinAppEx* pApp = DYNAMIC_DOWNCAST(CWinAppEx, AfxGetApp());
        if (pApp != NULL)
        {
            pApp->InitShellManager();
        }
    }

    if (afxShellManager == NULL)
    {
        ASSERT(FALSE);
    }
    else
    {
        bUpdate = afxShellManager->BrowseForFolder(strPath, m_pWndList, strPath);
    }
}
else
{
    CFileDialog dlg(m_bOpenFileDialog, m_strDefExt, strPath, m_dwFileOpenFlags, m_strFilter, m_pWndList);
    if (dlg.DoModal() == IDOK)
    {
        bUpdate = TRUE;
        strPath = dlg.GetPathName();
    }
}

As you see, Microsoft itself does not use the Cfiledialog class when wants to open a dialog for picking folders.

For using code like that, your application class MUST be derived from CWinAppEx, not CWinApp