无法获取 windows 7 C++ 上虚拟文件夹的路径（shell 命名空间扩展相关）

Question

通过使用 Microsoft windows SDK 7.0，explorerDataProvider，我在 windows 7.

上安装了一个虚拟文件夹

当我从应用程序打开文件浏览对话框时，

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

INT_PTR result = dlg.DoModal();

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

还可以显示虚拟文件夹：

但是当我select文件时，像"Zero"可以然后点击"Open"，

我尝试在

中添加断点

INT_PTR result = dlg.DoModal();

但是好像这个错误发生在DoModal().

里面

我正在研究并修改虚拟文件夹的代码：

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;
}

和return中的路径GetDisplayNameOf()

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;
}

但它仍然统计应用程序中 "Path does not exist" 的错误消息。我在 GetDisplayNameOf 中添加了断点，但是当应用程序打开文件浏览对话框时它永远不会被触发。但是如果我只是双击打开一个普通的文件夹"Computer"，它就会被触发。

"Path does not exist" 的错误消息似乎无法弃用或覆盖。有什么方法可以将虚拟文件夹修改为 return 正确的路径？

更新：我试过IFileDialog，我从MSDN示例中复制了代码，代码，并添加断点，看看会发生什么。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
 }
}

当我点击"Open"按钮时，"Path does not exist, check the path and try again"的错误信息框仍然出现。在我单击“打开”按钮后，它永远不会出现 pfd->Show(NULL)。

根据示例代码中的注释，它应该从 hr = pfd->Show(NULL); 出来并到达下一个 line.but 错误消息发生在 hr = pfd->Show(NULL);.[=34= 中]

更新：

在IFileDialog中，我尝试了

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();
                        }
                    }

                }

我也试过了

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

并尝试了

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

我也试过 return 命名空间扩展代码中的全名：

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);
    }

但结果是：

更新:

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

这对我有用！！

Answer 1

在@RemyLebeau 的帮助下，我在我的代码中做了一些测试。最后，我找到了适合我的工作解决方案：我从 MSDN 复制了 IFileDialog 的代码：https://msdn.microsoft.com/en-us/library/windows/desktop/bb776913.aspx#file_types 然后稍微修改一下：

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;
}

重点是用SetOptions覆盖选项。基于 MSDN：https://msdn.microsoft.com/en-us/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.

这些标志是阻止它的默认值returns。所以我将其设置为：

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

这些标志意味着：

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.

然后终于成功了！

无法获取 windows 7 C++ 上虚拟文件夹的路径（shell 命名空间扩展相关）

cannot get the path for the virtual folder on windows 7 C++(shell namespace extension related)

c++

windows

registry

shell-extensions

shell-namespace-extension