How to get a PIDL from a Windows library's GUID? - c++

Question

How can I get the PIDL of a library from its GUID?
For example, if I have the GUID of the Documents library ("{7B0DB17D-9CD2-4A93-9733-46CC89022E7C}"), how can I convert that into the library's ID list?
I thought SHParseDisplayName would do the job, but it returns "file not found."
Bear in mind that what I need is the PIDL of the library, not of its default folder.
This is straight C++, no .Net.
TIA
Edit: This is the code that works, from the response below (without error checks). guid is a GUID string prepended with 'shell:::', e.g., 'shell:::{7B0DB17D-9CD2-4A93-9733-46CC89022E7C}'.
IShellFolder* pDesktop;
LPITEMIDLIST pidl;
SHGetDesktopFolder(&pDesktop);
pDesktop->ParseDisplayName(nullptr, nullptr, guid, nullptr, &pidl, 0);
Edit 2: Even easier: SHParseDisplayName works if the 'shell:::' is prepended:
SHParseDisplayName(guid, nullptr, &pidl, 0, nullptr);

Answer 1

According to the documentation for IShellFolder::ParseDisplayName you can simply pass it a filename in the form ::{GUID} if you are using the desktop folder.
Edit: the documentation appears to be incomplete, according to this answer you need to add shell: to the start of the string.
p->ParseDisplayName(m_hWnd, NULL, _T("shell:::{7B0DB17D-9CD2-4A93-9733-46CC89022E7C}"), NULL, &pidl, NULL);

Answer 2

You want the function SHGetKnownFolderIDList.
Given a KnownFolderID guid (e.g. FOLDERID_DocumentsLibrary - {7B0DB17D-9CD2-4A93-9733-46CC89022E7C})
returns you the absolute pidl of that KNOWNFOLDER
For example:
PIDLIST_ABSOLUTE pidl;
HRESULT hr = SHGetKnownFolderItem(FOLDERID_DocumentsLibrary, 0, NULL, out pidl);
Bonus Chatter
There are three shell functions for dealing with KNOWNFOLDERs
SHGetKnownFolderPath : Get the full path of a known folder (e.g. C:\Users\Chris\Documents)
SHGetKnownFolderIDList: Get the absolute pidl of a known folder
SHGetKnownFolderItem: Get the IShellItem of a known folder