Building a ITEMIDLIST from a number of SHITEMID structs

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Peter Larsen - 30 Jan 2006 18:21 GMT

Hi,

I'm new to C# and need help to build a list if pidl's (ITEMIDLIST).

I am currently working on a shell-browser, and i think i have most of it
done right now - except from the icon stuff.
Up to now i have used SHGetFileInfo to load the icon-index, but its slow and
doest'n work on network drives.

I need to be able to use ShellFolder.GetUIObjectOf (see
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platfor
m/shell/reference/ifaces/iextracticon/iextracticon.asp).

But i can't get this function to work right.
Please show me a working sample of IShellFolder.GetUIObjectOf.
Thank you in advance.
/Peter

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Mattias Sjögren - 30 Jan 2006 23:30 GMT

Peter,

>I'm new to C# and need help to build a list if pidl's (ITEMIDLIST).

...

>Please show me a working sample of IShellFolder.GetUIObjectOf.

Do you need it for the third parameter of GetUIObjectOf? Assuming you
store your PIDLs as IntPtrs, you can declare the parameter type as
either ref IntPtr or as IntPtr[] depending on if you're going to pass
in one or multiple identifiers.

Mattias

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Mattias Sjögren [C# MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

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Peter Larsen - 31 Jan 2006 09:07 GMT

I think my problem is IExtractIcon or the way i deliver SHITEMID.

I have found the interface IShellFolder more than once on the internet, and
i am not sure which on is the right one:

-------------------------------------------------------------------------------
[PreserveSig()]
uint GetUIObjectOf(
IntPtr hwndOwner, // Handle to the owner window that the client
// should specify if it displays
// a dialog box or message box.
int cidl, // Number of file objects or subfolders specified
// in the apidl parameter.
[In(), MarshalAs(UnmanagedType.LPArray)] IntPtr[]
apidl, // Address of an array of pointers to ITEMIDLIST
// structures, each of which
// uniquely identifies a file object or subfolder
// relative to the parent folder.
[In()]
ref Guid riid, // Identifier of the COM interface object to
// return.
IntPtr rgfReserved, // Reserved.
[MarshalAs(UnmanagedType.Interface)]
out object ppv); // Pointer to the requested interface.
-------------------------------------------------------------------------------

[PreserveSig]
Int32 GetUIObjectOf(
IntPtr hwndOwner, // Handle to the owner window that the
client should specify if it displays
// a dialog box or message box.
UInt32 cidl, // Number of file objects or subfolders
specified in the apidl parameter.
IntPtr[] apidl, // Address of an array of pointers to
ITEMIDLIST structures, each of which
// uniquely identifies a file object or subfolder relative to
the parent folder.
Guid riid, // Identifier of the COM interface object to
return.
ref UInt32 rgfReserved, // Reserved.
out IntPtr ppv); // Pointer to the requested interface.

-------------------------------------------------------------------------------

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Peter Larsen - 31 Jan 2006 14:38 GMT

No need of talking about this issue anymore - i have found a way ...

extractIcon.GetIconLocation(0, iconPath, MAX_PATH, ref iconIndex, ref
pwFlags);

uint GetIconLocation(int uFlags, [MarshalAs(UnmanagedType.LPStr)]
StringBuilder szIconFile, int
cchMax, ref int piIndex, ref int pwFlags);

Thanks for your time :-)

> Peter,
>
[quoted text clipped - 8 lines]
>
> Mattias

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Building a ITEMIDLIST from a number of SHITEMID structs

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