图像不能正常工作，如果我从我的shell命名空间扩展文件夹打开它

Question

我有我的自定义shell命名空间扩展。只是想有一个虚拟文件夹映射到C:/磁盘上的某个文件夹，具有相同的功能。

using namespace ATL;

class ATL_NO_VTABLE CMyShellFolder :
public CComObjectRootEx<CComMultiThreadModel>,
public CComCoClass<CMyShellFolder, &CLSID_CMyShellFolder>,
public IPersistFolder2,
public IShellFolder2,
public IExplorerPaneVisibility
{
CComHeapPtr<ITEMIDLIST_ABSOLUTE> m_pidl;

CComPtr<IShellFolder2> m_folder;

CComPtr<IThumbnailHandlerFactory> m_thFactory;
CComPtr<IUnknown> m_site;

public:
CMyShellFolder()
{
}

static HRESULT WINAPI UpdateRegistry(BOOL reg) throw();

BEGIN_COM_MAP(CMyShellFolder)
COM_INTERFACE_ENTRY(IShellFolder)
COM_INTERFACE_ENTRY(IShellFolder2)
COM_INTERFACE_ENTRY2(IPersist, IPersistFolder)
COM_INTERFACE_ENTRY(IPersistFolder)
COM_INTERFACE_ENTRY(IPersistFolder2)
COM_INTERFACE_ENTRY(IExplorerPaneVisibility)
END_COM_MAP()

DECLARE_PROTECT_FINAL_CONSTRUCT()
---------------------------------
HRESULT CMyShellFolder::BindToObject(PCUIDLIST_RELATIVE pidl, IBindCtx* pbc, REFIID riid, LPVOID* ppv)
{
if (riid == __uuidof(IShellFolder3))
return E_NOINTERFACE;

HR;
CComObject<CMyShellFolder>* folder = nullptr;
CHECKARG(pidl);
hr = E_NOINTERFACE;
if (riid == IID_IShellFolder ||
riid == IID_IShellFolder2)
{
// check it's a folder
SFGAOF atts = SFGAO_FOLDER;
auto hr2 = GetAttributesOf(1, (PCUITEMID_CHILD_ARRAY)&pidl, &atts);
if (FAILED(hr2) || !(atts & SFGAO_FOLDER))
goto cleanup; // nope, get out
CHECKHR(CreateInstanceAddRef(&folder));
CHECKHR(folder->_Initialize(this, pidl));
CHECKHR(folder->QueryInterface(riid, ppv));
}
RELEASE(folder);
HRONFAIL(L"CMyShellFolder::BindToObject"); }

HRESULT CMyShellFolder::CreateViewObject(HWND hwnd, REFIID riid, LPVOID* ppv)
{
HR;
SFV_CREATE sfvc = { 0 };
DEFCONTEXTMENU dcm = { 0 };
CHECKITEM;
CHECKARG(ppv);
hr = E_NOINTERFACE;
if (riid == IID_IShellView)
{
sfvc.cbSize = sizeof(SFV_CREATE);
CHECKHR(QueryInterface(IID_PPV_ARGS(&sfvc.pshf)));
QueryInterface(IID_PPV_ARGS(&sfvc.psfvcb));
CHECKHR(SHCreateShellFolderView(&sfvc, (IShellView**)ppv));
goto cleanup;
}
if (riid == IID_IContextMenu)
{
dcm.hwnd = hwnd;
//dcm.pidlFolder = (PCIDLIST_ABSOLUTE)m_pidl.m_pData;
QueryInterface(IID_PPV_ARGS(&dcm.pcmcb));
CHECKHR(QueryInterface(IID_PPV_ARGS(&dcm.psf)));
CHECKHR(SHCreateDefaultContextMenu(&dcm, riid, ppv));
goto cleanup;
}
if (riid == IID_ITransferSource || // for delete & file operations
riid == IID_IDropTarget) // for copy paste & dd
{
CHECKHR(m_folder->CreateViewObject(hwnd, riid, ppv));
goto cleanup;
}
CHECKHR(m_folder->CreateViewObject(hwnd, riid, ppv));
cleanup:
RELEASE(dcm.pcmcb);
RELEASE(dcm.psf);
RELEASE(sfvc.psfvcb);
RELEASE(sfvc.pshf);
HRONFAIL(L"CMyShellFolder::CreateViewObject"); }

但是从我的自定义文件夹打开图像不工作。图像image2实际上，它显示图像大约一秒钟，然后出现错误信息。但是可以通过Paint

正常打开

Answer 1

您的nse需要处理IID_Istream以使用UWP程序打开文件

// Pseudo code
STDMETHODIMP NSEShellFolder::BindToObject (LPCITEMIDLIST pidl, LPBC pbcReserved, REFIID riid, void** ppvOut)
{
HRESULT hr = E NOTIMPL;
//.....//
if (riid == IID IStream) {
DWORD grfMode = 0;
if (pbcReserved) { //IBindCtx
BIND OPTS opts;
ZeroMemory (&opts, sizeof (BIND OPTS));
opts.cbStruct = sizeof (opts);
pbc->GetBindOptions (&opts);
grfMode = opts.grfMode;
}
//If your nse Has FileSystemPath, Win32 API ¹SHCreateStreamOnFile Ex' is useful.
//or you can implement own IStream interface.
LPWSTR pPath = CNSEData::GetPath (m_pidl);
BOOL bCreate = grfMode & STGM CREATE? TRUE : FALSE;
hr = SHCreateStreamOnFileEx (pPath,grfMode, FILE_ATTRIBUTE_NORMAL,bCreate,NULL, (IStream**)ppvOut);
}
//.....//
return hr;
}

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