pinvoke.net: Edit: user32.setwindowlong

@msdn=http://msdn2.microsoft.com/en-us/library/ms644898.aspx
@pinvoke=http://pinvoke.net/$$$.htm

Summary: The SetWindowLongPtr API. Use this one instead of SetWindowLong to assure 64 bit compatibility.

!!!!C# Signature:

// This helper static method is required because the 32-bit version of user32.dll does not contain this API
 // (on any versions of Windows), so linking the method will fail at run-time. The bridge dispatches the request
 // to the correct function (GetWindowLong in 32-bit mode and GetWindowLongPtr in 64-bit mode)
 public static IntPtr SetWindowLongPtr(HandleRef hWnd, int nIndex, IntPtr dwNewLong)
 {
      if (IntPtr.Size == 8)
      return SetWindowLongPtr64(hWnd, nIndex, dwNewLong);
      else
      return new IntPtr(SetWindowLong32(hWnd, nIndex, dwNewLong.ToInt32()));
 }

[DllImport("user32.dll", EntryPoint="SetWindowLong")]
 private static extern int SetWindowLong32(HandleRef hWnd, int nIndex, int dwNewLong);
 
 [DllImport("user32.dll", EntryPoint="SetWindowLongPtr")]
 private static extern IntPtr SetWindowLongPtr64(HandleRef hWnd, int nIndex, IntPtr dwNewLong);
 //
 If that doesn't work, the following signature can be used alternatively.
 //
 [DllImport("user32.dll")]
 static extern int SetWindowLong(IntPtr hWnd, int nIndex, uint dwNewLong);

!!!!VB.NET Signature:
  <System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint:="SetWindowLong")> _
  Private Shared Function SetWindowLong32(ByVal hWnd As IntPtr, <MarshalAs(UnmanagedType.I4)>nIndex As WindowLongFlags, ByVal dwNewLong As Integer) As Integer
  End Function

<System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint:="SetWindowLongPtr")> _
  Private Shared Function SetWindowLongPtr64(ByVal hWnd As IntPtr, <MarshalAs(UnmanagedType.I4)>nIndex As WindowLongFlags, ByVal dwNewLong As IntPtr) As IntPtr
  End Function

Public Shared Function SetWindowLongPtr(ByVal hWnd As IntPtr, nIndex As WindowLongFlags, ByVal dwNewLong As IntPtr) As IntPtr
    If IntPtr.Size = 8 Then
      Return SetWindowLongPtr64(hWnd, nIndex, dwNewLong)
    Else
      Return New IntPtr(SetWindowLong32(hWnd, nIndex, dwNewLong.ToInt32))
    End If
  End Function
!!!!VB.NET Signature:
 Public Declare Function SetWindowLongPtr Lib "user32" Alias "SetWindowLongPtrA" _
                (ByVal hWnd As Long, _
                 ByVal nIndex As WindowLongFlags, _
                 ByVal dwNewLong As Long) As Long

!!!!User-Defined Types:
[WindowLongFlags]

!!!!Alternative Managed API:
Do you know one?  Please contribute it!

!!!!Notes:
The constants required to call this can be found in the constant section of this site.

!!!!Tips & Tricks:
You can show and hide the window from the taskbar. Use the GWL_EXSTYLE, WS_EX_APPWINDOW and WS_EX_NOACTIVATE constants to achieve this.

Constant Values:
    GWL_EXSTYLE needs a value of -0x14.
    WS_EX_NOACTIVATE needs a value of 0x08000000.
    WS_EX_APPWINDOW needs a value of 0x40000.

To show a winow, use the following call:
    SetWindowLong(GetPinvokeHandle(), GWL_EXSTYLE, WS_EX_APPWINDOW);

To hide a window, use the following call:
    SetWindowLong(GetPinvokeHandle(), GWL_EXSTYLE, WS_EX_NOACTIVATE);

!!!!Sample Code:
Please add some!

Documentation: SetWindowLongPtr@msdn on MSDN

Error in Windows 7 64 bit under Parallels on Mac, in Visual Studio Express 13 (Visual Basic Forms Application):
When called, the following error was given:
Additional information: Unable to find an entry point named 'SetWindowLongPtrA' in DLL 'user32'
...Geoff Kelly