2017-11-27 13:11:20 -05:00
using System ;
using System.Runtime.InteropServices ;
using Vanara.Extensions ;
using Vanara.InteropServices ;
2018-01-09 16:08:57 -05:00
// ReSharper disable MemberCanBePrivate.Global
// ReSharper disable FieldCanBeMadeReadOnly.Global
// ReSharper disable UnusedMember.Global
2017-11-27 13:11:20 -05:00
namespace Vanara.PInvoke
{
public static partial class Shell32
{
/// <summary>A value that specifies the desired format of the string.</summary>
[PInvokeData("Shtypes.h", MSDNShortId = "bb759820")]
public enum STRRET_TYPE : uint
{
/// <summary>The string is at the address specified by pOleStr member.</summary>
STRRET_WSTR = 0x0000 ,
/// <summary>The uOffset member value indicates the number of bytes from the beginning of the item identifier list where the string is located.</summary>
STRRET_OFFSET = 0x0001 ,
/// <summary>The string is returned in the cStr member.</summary>
STRRET_CSTR = 0x0002 ,
}
/// <summary>Contains a list of item identifiers.</summary>
[StructLayout(LayoutKind.Sequential)]
[PInvokeData("Shtypes.h", MSDNShortId = "bb773321")]
public struct ITEMIDLIST
{
/// <summary>A list of item identifiers.</summary>
public SHITEMID mkid ;
}
2018-01-09 16:08:57 -05:00
/// <summary>Defines an item identifier.</summary>
2017-11-27 13:11:20 -05:00
[StructLayout(LayoutKind.Sequential)]
[PInvokeData("Shtypes.h", MSDNShortId = "bb759800")]
public struct SHITEMID
{
/// <summary>The size of identifier, in bytes, including <see cref="cb" /> itself.</summary>
public ushort cb ;
/// <summary>A variable-length item identifier.</summary>
public byte [ ] abID ;
}
/// <summary>Contains strings returned from the IShellFolder interface methods.</summary>
[StructLayout(LayoutKind.Explicit, Size = 264)]
[PInvokeData("Shtypes.h", MSDNShortId = "bb759820")]
public struct STRRET
{
/// <summary>A value that specifies the desired format of the string.</summary>
[FieldOffset(0)] public STRRET_TYPE uType ;
/// <summary>
/// A pointer to the string. This memory must be allocated with CoTaskMemAlloc. It is the calling application's responsibility to free this memory
/// with CoTaskMemFree when it is no longer needed.
/// </summary>
[FieldOffset(4), MarshalAs(UnmanagedType.BStr)]
public StrPtrUni pOleStr ; // must be freed by caller of GetDisplayNameOf
/// <summary>The offset into the item identifier list.</summary>
[FieldOffset(4)] public uint uOffset ; // Offset into SHITEMID
/// <summary>The buffer to receive the display name. CHAR[MAX_PATH]</summary>
[FieldOffset(4), MarshalAs(UnmanagedType.LPStr, SizeConst = Kernel32.MAX_PATH)]
public string cStr ; // Buffer to fill in (ANSI)
/// <summary>Returns a <see cref="System.String"/> that represents this instance.</summary>
/// <returns>A <see cref="System.String"/> that represents this instance.</returns>
public override string ToString ( ) = > uType = = STRRET_TYPE . STRRET_CSTR
? cStr
: ( uType = = STRRET_TYPE . STRRET_WSTR ? pOleStr . ToString ( ) : string . Empty ) ;
}
internal class STRRETMarshaler : ICustomMarshaler
{
public static ICustomMarshaler GetInstance ( string cookie ) = > new STRRETMarshaler ( ) ;
public void CleanUpManagedData ( object ManagedObj )
{
}
public void CleanUpNativeData ( IntPtr pNativeData )
{
if ( pNativeData = = IntPtr . Zero ) return ;
pNativeData . ToStructure < STRRET > ( ) . pOleStr . Free ( ) ;
Marshal . FreeCoTaskMem ( pNativeData ) ;
}
public int GetNativeDataSize ( ) = > Marshal . SizeOf ( typeof ( STRRET ) ) ;
public IntPtr MarshalManagedToNative ( object ManagedObj )
{
if ( ! ( ManagedObj is string s ) ) throw new InvalidCastException ( ) ;
var sr = new STRRET { uType = STRRET_TYPE . STRRET_WSTR } ;
sr . pOleStr . Assign ( s ) ;
return sr . StructureToPtr ( Marshal . AllocCoTaskMem , out int _ ) ;
}
public object MarshalNativeToManaged ( IntPtr pNativeData )
{
if ( pNativeData = = IntPtr . Zero ) return null ;
var sr = pNativeData . ToStructure < STRRET > ( ) ;
var s = sr . ToString ( ) . Clone ( ) as string ;
if ( sr . uType = = STRRET_TYPE . STRRET_WSTR )
sr . pOleStr . Free ( ) ;
return s ;
}
}
}
}