How to use SHCreateItemFromParsingName with names from the shell namespace?
It would be interesting to debug Explorer and see how it does it.
begin from windows 7 shell use next undocumented interface (until it unchanged from win 7 up to latest win 10)
MIDL_INTERFACE("88DF9332-6ADB-4604-8218-508673EF7F8A") IShellUrl : public IUnknown
{
virtual HRESULT STDMETHODCALLTYPE ParseFromOutsideSource(PCWSTR,DWORD);
virtual HRESULT STDMETHODCALLTYPE GetUrl(PWSTR,DWORD);
virtual HRESULT STDMETHODCALLTYPE SetUrl(PCWSTR,DWORD);
virtual HRESULT STDMETHODCALLTYPE GetDisplayName(PWSTR,DWORD);
virtual HRESULT STDMETHODCALLTYPE GetPidl(ITEMIDLIST_ABSOLUTE * *);
virtual HRESULT STDMETHODCALLTYPE SetPidl(ITEMIDLIST_ABSOLUTE const *);
virtual HRESULT STDMETHODCALLTYPE SetPidlAndArgs(ITEMIDLIST_ABSOLUTE const *,PCWSTR);
virtual PWSTR STDMETHODCALLTYPE GetArgs();
virtual HRESULT STDMETHODCALLTYPE AddPath(ITEMIDLIST_ABSOLUTE const *);
virtual void STDMETHODCALLTYPE SetCancelObject(ICancelMethodCalls *);
virtual HRESULT STDMETHODCALLTYPE StartAsyncPathParse(HWND,PCWSTR,DWORD,ICancelMethodCalls *);
virtual HRESULT STDMETHODCALLTYPE GetParseResult();
virtual HRESULT STDMETHODCALLTYPE SetRequestID(int);
virtual HRESULT STDMETHODCALLTYPE GetRequestID(int *);
virtual HRESULT STDMETHODCALLTYPE SetNavFlags(int,int);
virtual HRESULT STDMETHODCALLTYPE GetNavFlags(long *);
virtual HRESULT STDMETHODCALLTYPE Execute(struct IShellNavigationTarget *,int *,DWORD);
virtual HRESULT STDMETHODCALLTYPE SetCurrentWorkingDir(ITEMIDLIST_ABSOLUTE const *);
virtual void STDMETHODCALLTYPE SetMessageBoxParent(HWND);
virtual HRESULT STDMETHODCALLTYPE GetPidlNoGenerate(ITEMIDLIST_ABSOLUTE * *);
virtual DWORD STDMETHODCALLTYPE GetStandardParsingFlags(BOOL);
};
class DECLSPEC_UUID("4BEC2015-BFA1-42FA-9C0C-59431BBE880E") ShellUrl;
we can use it for parse display names like Recycle Bin
, This PC
, etc.. (IFileOpenDialog dialog use it)
we can use it synchronous or asynchronous. for synchronous need call
ParseFromOutsideSource(L"your name", flags = GetStandardParsingFlags(0))
if this call is ok, we can get and use ITEMIDLIST_ABSOLUTE*
by call GetPidl
(when no longer need free it by ILFree
) also if file system path exist can get it by GetUrl
otherwise original name returned.
also possible use asynchronous parsing - you need call StartAsyncPathParse
- pass own hwnd and optional ICancelMethodCalls
interface. when operation finished shell post RegisterWindowMessage(L"AC_ParseComplete")
(wParam == IShellUrl*, lParam == 0
) to your window. you can get final status by call GetParseResult()
and if it ok - use GetPidl
code example for synchronous parsing
HRESULT ParsePath(PCWSTR path, IShellItem **ppsi)
{
IShellUrl* pShUrl;
HRESULT hr = CoCreateInstance(__uuidof(ShellUrl), NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pShUrl));
if (hr == S_OK)
{
if (SUCCEEDED(hr = pShUrl->ParseFromOutsideSource(path, pShUrl->GetStandardParsingFlags(TRUE))))
{
ITEMIDLIST_ABSOLUTE *pidl;
if (SUCCEEDED(hr = pShUrl->GetPidl(&pidl)))
{
hr = SHCreateItemFromIDList(pidl, IID_PPV_ARGS(ppsi));
//WCHAR sz[MAX_PATH];
//if (SUCCEEDED(pShUrl->GetUrl(sz, RTL_NUMBER_OF(sz)))) DbgPrint(">%S\n", sz);
ILFree(pidl);
}
}
pShUrl->Release();
}
return hr;
}
void tt(PCWSTR path)
{
IShellItem *psi;
if (0 <= ParsePath(path, &psi))
{
PWSTR szName;
if (S_OK == psi->GetDisplayName(SIGDN_NORMALDISPLAY, &szName))
{
DbgPrint("NORMALDISPLAY>%S\n", szName);
CoTaskMemFree(szName);
}
if (S_OK == psi->GetDisplayName(SIGDN_FILESYSPATH, &szName))
{
DbgPrint("FILESYSPATH>%S\n", szName);
CoTaskMemFree(szName);
}
psi->Release();
}
}
void tt()
{
if (0 <= CoInitialize(0))
{
tt(L"Recycle Bin");
tt(L"Startup");
CoUninitialize();
}
}
It would be interesting to debug Explorer and see how it does it.
My suggestion is; if the initial parse fails, prepend shell:
to the path string and try parsing it again with SHParseDisplayName
. If you set STR_PARSE_SHELL_PROTOCOL_TO_FILE_OBJECTS
in the bind context you can also bind to special files. The shell: protocol is able to parse the internal/canonical name of special/known folders but I don't know if it also checks the display name.
Edit:
I had a chance to play around a bit now and the shell: prefix is not a huge improvement because it only checks the known folder canonical names:
PCWSTR paths[] = {
TEXT("C:\\"),
TEXT("C:\\Windows"),
TEXT(""),
TEXT("This PC"),
TEXT("MyComputerFolder"), // Canonical KF name
TEXT("Recycle Bin"),
TEXT("RecycleBinFolder"), // Canonical KF name
TEXT("Libraries"),
TEXT("OneDrive"),
TEXT("Libraries\\Documents"),
TEXT("Network"),
TEXT("NetworkPlacesFolder"), // Canonical KF name
TEXT("Startup"),
};
OleInitialize(0);
INT pad = 0, fill, i;
for (i = 0; i < ARRAYSIZE(paths); ++i) pad = max(pad, lstrlen(paths[i]));
for (i = 1, fill = printf("%-*s | Original | shell: |\n", pad, ""); i < fill; ++i) printf("-"); printf("\n");
for (i = 0; i < ARRAYSIZE(paths); ++i)
{
WCHAR buf[MAX_PATH], *p1 = NULL, *p2 = NULL;
IShellItem*pSI;
HRESULT hr = SHCreateItemFromParsingName(paths[i], NULL, IID_IShellItem, (void**) &pSI);
if (SUCCEEDED(hr)) pSI->GetDisplayName(SIGDN_DESKTOPABSOLUTEPARSING, &p1), pSI->Release();
wsprintf(buf, L"shell:%s", paths[i]);
HRESULT hr2 = SHCreateItemFromParsingName(buf, NULL, IID_IShellItem, (void**) &pSI);
if (SUCCEEDED(hr2)) pSI->GetDisplayName(SIGDN_DESKTOPABSOLUTEPARSING, &p2), pSI->Release();
wprintf(L"%-*s | %.8x | %.8x | %s\n", pad, paths[i], hr, hr2, p2 && *p2 ? p2 : p1 ? p1 : L"");
CoTaskMemFree(p1), CoTaskMemFree(p2);
}
gives me this output:
| Original | shell: |
-------------------------------------------
C:\ | 00000000 | 80070003 | C:\
C:\Windows | 00000000 | 80070003 | C:\Windows
| 00000000 | 80070003 | ::{20D04FE0-3AEA-1069-A2D8-08002B30309D}
This PC | 80070002 | 80070003 |
MyComputerFolder | 80070002 | 00000000 | ::{20D04FE0-3AEA-1069-A2D8-08002B30309D}
Recycle Bin | 80070002 | 80070003 |
RecycleBinFolder | 80070002 | 00000000 | ::{645FF040-5081-101B-9F08-00AA002F954E}
Libraries | 80070002 | 00000000 | ::{031E4825-7B94-4DC3-B131-E946B44C8DD5}
OneDrive | 80070002 | 80070003 |
Libraries\Documents | 80070002 | 80070002 |
Network | 80070002 | 80070003 |
NetworkPlacesFolder | 80070002 | 00000000 | ::{F02C1A0D-BE21-4350-88B0-7367FC96EF3C}
Startup | 80070002 | 00000000 | C:\Users\Anders\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup
On Windows 8 SHCreateItemFromParsingName
calls SHParseDisplayName
(with STR_PARSE_AND_CREATE_ITEM
and STR_PARSE_TRANSLATE_ALIASES
) so even Microsoft have trouble separating parsing and display names in their API.
If you want to stay away from undocumented interfaces then you would have to add a third pass where you check the known folder display names. Or alternatively as Raymond Chen suggests in the comments; parse every path component manually against item display names in that IShellFolder
.