User32MapWindowPoints(IntPtr, IntPtr, Rectangle, UInt32) Method

[DllImportAttribute("User32.dll", SetLastError = true)]
public static int MapWindowPoints(
	IntPtr hWndFrom,
	IntPtr hWndTo,
	out Rectangle refRect,
	uint cPoints = 2
)

<DllImportAttribute("User32.dll", SetLastError := true>]
Public Shared Function MapWindowPoints ( 
	hWndFrom As IntPtr,
	hWndTo As IntPtr,
	<OutAttribute> ByRef refRect As Rectangle,
	Optional cPoints As UInteger = 2
) As Integer

Dim hWndFrom As IntPtr
Dim hWndTo As IntPtr
Dim refRect As Rectangle
Dim cPoints As UInteger

Dim returnValue As Integer

returnValue = User32.MapWindowPoints(hWndFrom, 
	hWndTo, refRect, cPoints)

public:
[DllImportAttribute(L"User32.dll", SetLastError = true)]
static int MapWindowPoints(
	IntPtr hWndFrom, 
	IntPtr hWndTo, 
	[InAttribute] [OutAttribute] Rectangle% refRect, 
	unsigned int cPoints = 2
)

[<DllImportAttribute("User32.dll", SetLastError = true)>]
static member MapWindowPoints : 
        hWndFrom : IntPtr * 
        hWndTo : IntPtr * 
        refRect : Rectangle byref * 
        ?cPoints : uint32 
(* Defaults:
        let _cPoints = defaultArg cPoints 2
*)
-> int 

No code example is currently available or this language may not be supported.

Parameters

hWndFrom  IntPtr

A handle to the window from which points are converted.

If this parameter is Zero or HWND_DESKTOP, the points are presumed to be in screen coordinates.

hWndTo  IntPtr

A handle to the window to which points are converted.

If this parameter is Zero or HWND_DESKTOP, the points are converted to screen coordinates.

refRect  Rectangle

A Rectangle structure, in which case the cPoints parameter should be set to 2.

cPoints  UInt32  (Optional)

The number of Point structures in the array pointed to by the refRect parameter.

This value should be always 2UI.

Return Value

(In addition to that, if precisely one of hwndFrom and hwndTo is mirrored, then each resulting horizontal coordinate is multiplied by -1.)

The high-order word is the number of pixels added to the vertical coordinate of each source point in order to compute the vertical coordinate of each destination point.

If the function fails, the return value is 0.

Reference