C# Definition:

    [ComImportAttribute()]
    [GuidAttribute("bcc18b79-ba16-442f-80c4-8a59c30c463b")]
    [InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IShellItemImageFactory
    {
        void GetImage(
        [In, MarshalAs(UnmanagedType.Struct)] SIZE size,
        [In] SIIGBF flags,
        [Out] out IntPtr phbm);
    }

[ComImport]
[InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
[Guid("43826d1e-e718-42ee-bc55-a1e261c37bfe")]
public interface IShellItem {
    void BindToHandler(IntPtr pbc,
        [MarshalAs(UnmanagedType.LPStruct)]Guid bhid,
        [MarshalAs(UnmanagedType.LPStruct)]Guid riid,
        out IntPtr ppv);

    void GetParent(out IShellItem ppsi);

    void GetDisplayName(SIGDN sigdnName, out IntPtr ppszName);

    void GetAttributes(uint sfgaoMask, out uint psfgaoAttribs);

    void Compare(IShellItem psi, uint hint, out int piOrder);
};

VB Definition:

    <ComImportAttribute(),  _
    GuidAttribute("bcc18b79-ba16-442f-80c4-8a59c30c463b"),  _
    InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIUnknown)>  _
    Public Interface IShellItemImageFactory    

        Sub GetImage(ByVal size As SIZE, ByVal flags As SIIGBF, ByRef phbm As IntPtr)
    End Interface

User-Defined Types:

SIZE

SIIGBF

<ComImport()> _
<Guid("43826d1e-e718-42ee-bc55-a1e261c37bfe")> _
<InterfaceType(ComInterfaceType.InterfaceIsIUnknown)> _
Public Interface IShellItem
    Sub BindToHandler(ByVal pbc As IntPtr, _
        <MarshalAs(UnmanagedType.LPStruct)> ByVal bhid As Guid, _
        <MarshalAs(UnmanagedType.LPStruct)> ByVal riid As Guid, _
        ByRef ppv As IntPtr)

Notes:

To get a thumbnail for a shell item, simply cast the IShellItem instance to IShellItemImageFactory and call GetImage() on it. Usage may look something like this:

    Sub GetParent(ByRef ppsi As IShellItem)

    IShellItem ppsi = null;
    IntPtr hbitmap = IntPtr.Zero;
    // GUID of IShellItem.
    Guid uuid = new Guid("43826d1e-e718-42ee-bc55-a1e261c37bfe");
    SHCreateItemFromParsingName(filename, IntPtr.Zero, uuid, out ppsi);
    ((IShellItemImageFactory)ppsi).GetImage(new SIZE(256, 256), 0x0, out hbitmap);
    Sub GetDisplayName(ByVal sigdnName As SIGDN, ByRef ppszName As IntPtr)

    Sub GetAttributes(ByVal sfgaoMask As UInt32, ByRef psfgaoAttribs As UInt32)

    Sub Compare(ByVal psi As IShellItem, ByVal hint As UInt32, ByRef piOrder As Integer)
End Interface

User-Defined Types:

SIGDN

Notes:

None.

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