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public struct STRRET

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     public UInt32 uType;    // One of the STRRET_* values

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     Public Structure STRRET

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     <FieldOffset(0)> Public uType As UInt32     'One of the STRRET_* values

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STRRET pDisplayName;

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pDisplayName.uType = (uint)STRRET_TYPE.STRRET_CSTR;

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// Get the display name from the STRRET structure

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WindowsAPI.StrRetToBuf(ref pDisplayName, pidlItems[0],

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Documentation

[STRRET] on MSDN

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The size of STRRET sturctre in 64bit is 272 bytes.

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    public static extern Int32 StrRetToBuf(

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        ref STRRET pstr,

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                STRRET   strret = new STRRET();

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                    out strret );

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                StrRetToBuf (

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                    ref strret,

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        out STRRET pName);

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    public  enum ESTRRET : int

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    eeRRET_WSTR     = 0x0000,            // Use STRRET.pOleStr

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    STRRET_OFFSET   = 0x0001,    // Use STRRET.uOffset to Ansi

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    STRRET_CSTR     = 0x0002            // Use STRRET.cStr

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    public struct STRRETinternal

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    public struct STRRET

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    public STRRETinternal data;

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    /// <param name="pName"> Address of a STRRET structure in which to return the display name.</param>

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    void GetDisplayNameOf(IntPtr pidl, ESHGDN uFlags, out STRRET pName);

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    public enum ESTRRET : int

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    eeRRET_WSTR = 0x0000,    // Use STRRET.pOleStr

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    STRRET_OFFSET = 0x0001,    // Use STRRET.uOffset to Ansi

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    STRRET_CSTR = 0x0002    // Use STRRET.cStr

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    public struct STRRETinternal

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    public struct STRRET

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    public STRRETinternal data;

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public enum STRRET_TYPE

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    STRRET_WSTR   = 0,   // Use STRRET.pOleStr  must be freed by caller of

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    STRRET_OFFSET = 0x1, // Use STRRET.uOffset Offset into SHITEMID for

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    STRRET_CSTR   = 0x2, // Use STRRET.cStr ANSI Buffer

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Enum STRRET_TYPE

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Use in conjuction with the STRRET structure.

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STRRET pDisplayName;

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pDisplayName.uType = (uint)STRRET_TYPE.STRRET_CSTR;

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Documentation

[STRRET_TYPE] on MSDN