I decided to try sorting the list before tackling positions. From my Win32 and MFC days, I knew exactly how to do this. Or so I thought.

As soon as I tried to pass a delegate as the LPARAM of SendMessage, I started crashing the Explorer.exe process. Does anyone out there know what is wrong with this code?

public delegate int CompareFunc(int lParam1,

                                 int lParam2,

                                 int lParamSort);



[DllImport("user32.dll", EntryPoint="SendMessage")]

public static extern int SendMessage(IntPtr hWnd, uint Msg, uint wParam,

        [MarshalAs(UnmanagedType.FunctionPtr)] CompareFunc compareFunc);



[DllImport("user32.dll",EntryPoint="FindWindow")]

private static extern int FindWindow(string _ClassName, string _WindowName);



[DllImport ("user32.dll")]

public static extern IntPtr GetWindow( IntPtr handle, int cmd );



private void button1_Click(object sender, System.EventArgs e)

{

   // const int LVA_DEFAULT = 0x0000; 

   const int LVM_FIRST = 0x1000;



   // ListView messages 

   // const int LVM_ARRANGE = (LVM_FIRST + 22); 

   const int LVM_SORTITEMS = (LVM_FIRST + 48); 

   const int GW_CHILD = 5; 



   int tmp = FindWindow( "ProgMan", null ); 

   IntPtr handle = new IntPtr(tmp); 

   handle = GetWindow( handle, GW_CHILD ); 

   handle = GetWindow( handle, GW_CHILD ); 



   CompareFunc f = new CompareFunc(Compare); 

   SendMessage( handle, LVM_SORTITEMS, 0, f );

}



public static int Compare( int lp1, int lp2, int lpSort )

{

   return 0;

}