//[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]
//If you use the above you may encounter an invalid memory access exception (when using ANSI
//or see nothing (when using unicode) when you use FOF_SIMPLEPROGRESS flag.
[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]
struct SHFILEOPSTRUCT
{
public IntPtr hwnd;
public FILEOP_FLAGS wFunc;
[MarshalAs(UnmanagedType.LPWStr)]
public string pFrom;
[MarshalAs(UnmanagedType.LPWStr)]
public string pTo;
public ushort fFlags;
//typedef int BOOL; (in platform SDK)
//BOOL fAnyOperationsAborted; (in platform SDK)
//public bool fAnyOperationsAborted;
public Int32 fAnyOperationsAborted;
public IntPtr hNameMappings;
[MarshalAs(UnmanagedType.LPWStr)]
public string lpszProgressTitle;
}
<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Unicode)> _
Public Structure SHFILEOPSTRUCT
Public hwnd As IntPtr
Public wFunc As FO_Func
<MarshalAs(UnmanagedType.LPWStr)> _
Public pFrom As String
<MarshalAs(UnmanagedType.LPWStr)> _
Public pTo As String
Public fFlags As FILEOP_FLAGS
Public fAnyOperationsAborted As Boolean
Public hNameMappings As IntPtr
<MarshalAs(UnmanagedType.LPWStr)> _
Public lpszProgressTitle As String ' only used if FOF_SIMPLEPROGRESS
End Structure
FILEOP_FLAGS
I tried to use this to send files to the recycle bin. It failed (Marshal.GetLastWin32Error was 6, invalid handle) and sometimes threw a NullReferenceException. To make it work I did the following;
public IntPtr pFrom;
public IntPtr pTo;
In my case I only needed pTo so I just added a null byte to the end and used Marshal.StringToHGlobalUni() to set the value
Under x64, the SHFILEOPSTRUCT must be declared without the Pack = 1 parameter, or it will fail. This is a real pain if you want your code to be platform independent, as you have to declare two separate structures, one with Pack = 1, and one without. You then have to declare two different SHFileOperation calls, one for each of the structures. Then you have to decide which one to call depending on whether you are running on 32 or 64 bit.
Don't declare a value for the Pack size. If you omit it, the correct value is used when marshaling and a single SHFILEOPSTRUCT can be used for both 32-bit and 64-bit operation.
You may use the functionality of the Microsoft.VisualBasic.dll(.NET framework) instead. They handle the 64 bit call well.
using Microsoft.VisualBasic.FileIO;
FileSystem.DeleteFile(path, UIOption.OnlyErrorDialogs, RecycleOption.SendToRecycleBin);