無法獲取Windows 7 C ++上虛擬文件夾的路徑（與外殼名稱空間擴展有關）

Question

通過使用Microsoft Windows SDK 7.0，explorerDataProvider，我在Windows 7上安裝了一個虛擬文件夾。

當我從應用程序打開文件瀏覽對話框時，

CFileDialog dlg(TRUE, NULL, 0, OFN_ENABLESIZING | OFN_ALLOWMULTISELECT, L"all(*.*)|*.*||", this);

INT_PTR result = dlg.DoModal();

if (result == IDOK)
{
   .
   . 
   .
   //some actions
}

它也可以顯示虛擬文件夾：

但是當我選擇文件時，例如“零”可以單擊“打開”，

我試圖添加斷點

INT_PTR result = dlg.DoModal();

但是似乎此錯誤發生在DoModal()內部。

我進行了一些研究並修改了虛擬文件夾的代碼：

HRESULT CFolderViewImplFolder::GetAttributesOf(UINT cidl, PCUITEMID_CHILD_ARRAY apidl, ULONG *rgfInOut)
{
// If SFGAO_FILESYSTEM is returned, GetDisplayNameOf(SHGDN_FORPARSING) on that item MUST
// return a filesystem path.
HRESULT hr = E_INVALIDARG;

DWORD dwAttribs = 0;
dwAttribs |= SFGAO_BROWSABLE;
if (1 == cidl)
{
    int nLevel = 0;
    hr = _GetLevel(apidl[0], &nLevel);
    if (SUCCEEDED(hr))
    {
        BOOL fIsFolder = FALSE;
        hr = _GetFolderness(apidl[0], &fIsFolder);
        if (SUCCEEDED(hr))
        {

            if (fIsFolder)
            {
                dwAttribs |= SFGAO_FOLDER;

                dwAttribs |= SFGAO_FILESYSANCESTOR;
            }
            else
            {
                dwAttribs |= SFGAO_SYSTEM;

                dwAttribs |= SFGAO_FILESYSTEM;
            }

            if (nLevel < g_nMaxLevel)
            {
                dwAttribs |= SFGAO_HASSUBFOLDER;
            }
        }
    }
}

*rgfInOut &= dwAttribs;

return hr;
}

並在GetDisplayNameOf()返回路徑

HRESULT CFolderViewImplFolder::GetDisplayNameOf(PCUITEMID_CHILD pidl, SHGDNF shgdnFlags, STRRET *pName)
{
HRESULT hr = S_OK;
if (shgdnFlags & SHGDN_FORPARSING)
{
    WCHAR szDisplayName[MAX_PATH];
    if (shgdnFlags & SHGDN_INFOLDER)
    {
        // This form of the display name needs to be handled by ParseDisplayName.
        hr = _GetName(pidl, szDisplayName, ARRAYSIZE(szDisplayName));
    }
    else
    {
        PWSTR pszThisFolder = L"Computer\\Jerry";

            StringCchCopy(szDisplayName, ARRAYSIZE(szDisplayName), pszThisFolder);
            StringCchCat(szDisplayName, ARRAYSIZE(szDisplayName), L"\\");

            WCHAR szName[MAX_PATH];
            hr = _GetName(pidl, szName, ARRAYSIZE(szName));
            if (SUCCEEDED(hr))
            {
                StringCchCat(szDisplayName, ARRAYSIZE(szDisplayName), szName);
            }
    }
    if (SUCCEEDED(hr))
    {
        hr = StringToStrRet(szDisplayName, pName);
    }
}
else
{
    PWSTR pszName;
    hr = _GetName(pidl, &pszName);
    if (SUCCEEDED(hr))
    {
        hr = StringToStrRet(pszName, pName);
        CoTaskMemFree(pszName);
    }
}
return hr;
}

但是它仍會在應用程序中統計錯誤消息“路徑不存在”。 我在GetDisplayNameOf添加了斷點，但是當應用程序打開文件瀏覽對話框時，它永遠不會觸發。 但是，如果我僅通過雙擊“計算機”打開常規文件夾，就會觸發該文件夾。

錯誤消息“路徑不存在”似乎無法被棄用或覆蓋。 我可以修改虛擬文件夾以返回正確路徑的任何方法嗎？

---

更新 ：我嘗試了IFileDialog ，我從MSDN示例中復制了代碼，代碼，並添加了斷點以查看會發生什么。 然而，

// Show the dialog
hr = pfd->Show(NULL);//the breakpoint is added here
if (SUCCEEDED(hr))
{
  // Obtain the result once the user clicks 
 // the 'Open' button.
 // The result is an IShellItem object.
 IShellItem *psiResult;
 hr = pfd->GetResult(&psiResult);
 if (SUCCEEDED(hr))
 {
   //do something
 }
}

當我單擊“打開”按鈕時，仍然顯示“路徑不存在，請檢查路徑並重試”的錯誤消息框。 單擊“打開”按鈕后，它永遠不會從pfd->Show(NULL)中pfd->Show(NULL) 。

根據示例代碼中的注釋，它應該來自hr = pfd->Show(NULL); 並到達下一行。但是錯誤消息發生在hr = pfd->Show(NULL); 。

更新 ：

在IFileDialog ，我嘗試了

hr = pfd->GetOptions(&dwFlags);
            if (SUCCEEDED(hr))
            {

                hr = pfd->SetOptions(dwFlags | FOS_ALLNONSTORAGEITEMS);
                if (SUCCEEDED(hr))
                {
                    // Show the dialog
                    hr = pfd->Show(NULL);
                    if (SUCCEEDED(hr))
                    {
                        // Obtain the result once the user clicks 
                        // the 'Open' button.
                        // The result is an IShellItem object.
                        IShellItem *psiResult;
                        hr = pfd->GetResult(&psiResult);
                        if (SUCCEEDED(hr))
                        {
                            // We are just going to print out the 
                            // name of the file for sample sake.
                            PWSTR pszFilePath = NULL;
                            hr = psiResult->GetDisplayName(SIGDN_FILESYSPATH,
                                &pszFilePath);
                            if (SUCCEEDED(hr))
                            {
                                TaskDialog(NULL,
                                    NULL,
                                    L"CommonFileDialogApp",
                                    pszFilePath,
                                    NULL,
                                    TDCBF_OK_BUTTON,
                                    TD_INFORMATION_ICON,
                                    NULL);
                                CoTaskMemFree(pszFilePath);
                            }
                            psiResult->Release();
                        }
                    }

                }

我也試過

hr = pfd->SetOptions(dwFlags);//delete FOS_FORCEFILESYSTEM         

並嘗試

DWORD dwFlags = 0;
if (SUCCEEDED(hr))
{
    // overwrite options completely
    hr = pfd->SetOptions(dwFlags | FOS_ALLNONSTORAGEITEMS);

我還嘗試在名稱空間擴展代碼中返回全名：

WCHAR szDisplayName[MAX_PATH];
    if (shgdnFlags & SHGDN_INFOLDER)
    {
        // This form of the display name needs to be handled by ParseDisplayName.
        hr = _GetName(pidl, szDisplayName, ARRAYSIZE(szDisplayName));
    }
    else
    {
        PWSTR pszThisFolder;// = L"Computer\\Jerry";
        hr = SHGetNameFromIDList(m_pidl, (shgdnFlags & SHGDN_FORADDRESSBAR) ? SIGDN_DESKTOPABSOLUTEEDITING : SIGDN_DESKTOPABSOLUTEPARSING, &pszThisFolder);
        if (SUCCEEDED(hr))
        {
            StringCchCopy(szDisplayName, ARRAYSIZE(szDisplayName), pszThisFolder);
            StringCchCat(szDisplayName, ARRAYSIZE(szDisplayName), L"\\");

            WCHAR szName[MAX_PATH];
            hr = _GetName(pidl, szName, ARRAYSIZE(szName));
            if (SUCCEEDED(hr))
            {
                StringCchCat(szDisplayName, ARRAYSIZE(szDisplayName), szName);
            }
            CoTaskMemFree(pszThisFolder);
        }
    }
    if (SUCCEEDED(hr))
    {
        hr = StringToStrRet(szDisplayName, pName);
    }

但是結果是：

更新 ：

hr = pfd->SetOptions(dwFlags | FOS_ALLNONSTORAGEITEMS | FOS_NOVALIDATE);

這對我有用！

Answer 1

在@RemyLebeau的幫助下，我在代碼中進行了一些測試。 最后，我找到了適合我的解決方案：我從MSDN復制了IFileDialog的代碼： https : IFileDialog ，然后進行了一些修改位：

HRESULT BasicFileOpen()
{
// CoCreate the File Open Dialog object.
IFileDialog *pfd = NULL;
HRESULT hr = CoCreateInstance(CLSID_FileOpenDialog,
    NULL,
    CLSCTX_INPROC_SERVER,
    IID_PPV_ARGS(&pfd));
if (SUCCEEDED(hr))
{
    // Create an event handling object, and hook it up to the dialog.
    IFileDialogEvents *pfde = NULL;
    hr = CDialogEventHandler_CreateInstance(IID_PPV_ARGS(&pfde));
    if (SUCCEEDED(hr))
    {
        // Hook up the event handler.
        DWORD dwCookie;
        hr = pfd->Advise(pfde, &dwCookie);
        if (SUCCEEDED(hr))
        {
            // Set the options on the dialog.
            DWORD dwFlags = 0;
            if (SUCCEEDED(hr))
            {
                // the default flag is FOS_PATHMUSTEXIST and FOS_FILEMUSTEXIST, so I set overwrite it with these two flags.
                hr = pfd->SetOptions(dwFlags | FOS_ALLNONSTORAGEITEMS | FOS_NOVALIDATE);
                if (SUCCEEDED(hr))
                {
                    // Show the dialog
                    hr = pfd->Show(NULL);
                    if (SUCCEEDED(hr))
                    {
                        // Obtain the result once the user clicks 
                        // the 'Open' button.
                        // The result is an IShellItem object.
                        IShellItem *psiResult;
                        hr = pfd->GetResult(&psiResult);
                        if (SUCCEEDED(hr))
                        {
                            // We are just going to print out the 
                            // name of the file for sample sake.
                            PWSTR pszFilePath = NULL;
                            hr = psiResult->GetDisplayName(SIGDN_FILESYSPATH,
                                &pszFilePath);
                            if (SUCCEEDED(hr))
                            {
                                TaskDialog(NULL,
                                    NULL,
                                    L"CommonFileDialogApp",
                                    pszFilePath,
                                    NULL,
                                    TDCBF_OK_BUTTON,
                                    TD_INFORMATION_ICON,
                                    NULL);
                                CoTaskMemFree(pszFilePath);
                            }
                            psiResult->Release();
                        }
                    }

                }
            }
            // Unhook the event handler.
            pfd->Unadvise(dwCookie);
        }
        pfde->Release();
    }
    pfd->Release();
}
return hr;
}

關鍵是通過SetOptions覆蓋選項。 基於MSDN： https : //msdn.microsoft.com/zh-cn/library/windows/desktop/dn457282(v= vs.85) .aspx ，

FOS_PATHMUSTEXIST
The item returned must be in an existing folder. This is a default value.
FOS_FILEMUSTEXIST
The item returned must exist. This is a default value for the Open dialog.

這些標志是阻止其返回的默認值。 所以我將其設置為：

hr = pfd->SetOptions(dwFlags | FOS_ALLNONSTORAGEITEMS | FOS_NOVALIDATE);

這些標志意味着：

FOS_NOVALIDATE
Do not check for situations that would prevent an application from opening the selected file, such as sharing violations or access denied errors.

和

FOS_ALLNONSTORAGEITEMS
Enables the user to choose any item in the Shell namespace, not just those with SFGAO_STREAM or SFAGO_FILESYSTEM attributes. This flag cannot be combined with FOS_FORCEFILESYSTEM.

然后終於可以了！