PSSpecialFolder

2.4.2

KnownFolder.cs

using System;
using System.Runtime.InteropServices;
using System.Security;
 
namespace Win32API {
    public class KnownFolder {
        public readonly HResult Result;
        public readonly string Path;
 
        public KnownFolder(string guidText, uint flags) {
            IntPtr pszPath = IntPtr.Zero;
            try {
                this.Result = (HResult)SHGetKnownFolderPath(new Guid(guidText), flags, IntPtr.Zero, out pszPath);
                this.Path = Marshal.PtrToStringAuto(pszPath);
            } finally {
                if (pszPath != IntPtr.Zero) Marshal.FreeCoTaskMem(pszPath);
            }
        }
 
        [DllImport("shell32.dll"), SuppressUnmanagedCodeSecurity]
        static extern int SHGetKnownFolderPath(
            [MarshalAs(UnmanagedType.LPStruct)] Guid rfid, uint dwFlags, IntPtr hToken, out IntPtr pszPath);
    }
 
    public enum HResult {
        OK = 0,
        Fail = -2147467259, // 0x80004005
        NotFound = -2147024894, // 0x80070002
        AccessDenied = -2147024891, // 0x80070005
        InvalidArg = -2147024809, //0x80070057
    }
}