pinvoke.net: Edit: user32.getscrollbarinfo

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@pinvoke=http://pinvoke.net/$$$.htm

Summary: The GetScrollBarInfo API

!!!!C# Signature:

[DllImport( "user32.dll", SetLastError=true,  EntryPoint="GetScrollBarInfo")]
 private static extern int GetScrollBarInfo(IntPtr hWnd, uint idObject, ref SCROLLBARINFO psbi);
!!!!User-Defined Types:

[StructLayout(LayoutKind.Sequential)]
 public struct SCROLLBARINFO
 {
	public int cbSize;
	public Rectangle rcScrollBar;
	public int dxyLineButton;
	public int xyThumbTop;
	public int xyThumbBottom;
	public int reserved;
	[MarshalAs(UnmanagedType.ByValArray, SizeConst=6)]
	public int[] rgstate;
 }

!!!!Notes:
This didn't work for me with the Rectangle type for SCROLLBARINFO.rcScrollBar.  To rectify this I altered this declaration to type RECT using the following standard definition.

public struct RECT
 {
	public int left;
	public int top;
	public int right;
	public int bottom;
 }

This then worked for me!

!!!!Tips & Tricks:
for idObject, use one of these values (see the MSDN link at the bottom for their usage):
 private const uint OBJID_HSCROLL = 0xFFFFFFFA;
 private const uint OBJID_VSCROLL = 0xFFFFFFFB;
 private const uint OBJID_CLIENT = 0xFFFFFFFC;

!!!!Sample Code:

SCROLLBARINFO psbi = new SCROLLBARINFO();
 psbi.cbSize = Marshal.SizeOf(psbi);

int nResult = GetScrollBarInfo(this.Handle, OBJID_CLIENT, ref psbi); // "this" is a scrollbar

if (nResult == 0)
 {
	int nLatError = GetLastError(); // in kernel32.dll
 }
probably Marshal.GetLastWin32Error() is better here
!!!!Alternative Managed API:
if you have a reference to a '''System.Windows.Forms.ScrollBar''', use it's properties. otherwise,
 SystemInformation.HorizontalScrollbar*
and
 SystemInformation.VerticalScrollbar*
can give you some of the data.

Documentation: GetScrollBarInfo@msdn on MSDN
http://msdn2.microsoft.com/en-us/library/ms651286.aspx