User32GetUpdateRect(IntPtr, Rectangle, Boolean) Method

[DllImportAttribute("User32.dll", SetLastError = true)]
public static bool GetUpdateRect(
	IntPtr hWnd,
	ref Rectangle refRect,
	bool erase
)

<DllImportAttribute("User32.dll", SetLastError := true>]
Public Shared Function GetUpdateRect ( 
	hWnd As IntPtr,
	ByRef refRect As Rectangle,
	erase As Boolean
) As Boolean

Dim hWnd As IntPtr
Dim refRect As Rectangle
Dim erase As Boolean

Dim returnValue As Boolean

returnValue = User32.GetUpdateRect(hWnd, 
	refRect, erase)

public:
[DllImportAttribute(L"User32.dll", SetLastError = true)]
static bool GetUpdateRect(
	IntPtr hWnd, 
	Rectangle% refRect, 
	bool erase
)

[<DllImportAttribute("User32.dll", SetLastError = true)>]
static member GetUpdateRect : 
        hWnd : IntPtr * 
        refRect : Rectangle byref * 
        erase : bool -> bool 

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

Parameters

hWnd  IntPtr

A handle to the window whose update region is to be retrieved.

refRect  Rectangle

A NativeRectangle that receives the coordinates, in device units, of the enclosing rectangle.

An application can set this parameter to to determine whether an update region exists for the window.

If this parameter is , GetUpdateRect(IntPtr, NativeRectangle, Boolean) returns nonzero if an update region exists, and zero if one does not. This provides a simple and efficient means of determining whether a WM_Paint message resulted from an invalid area.

erase  Boolean

[Missing <param name="erase"/> documentation for "M:DevCase.Win32.NativeMethods.User32.GetUpdateRect(System.IntPtr,System.Drawing.Rectangle@,System.Boolean)"]

Return Value

If there is no update region, the return value is .

To get extended error information, call GetLastWin32Error.

Reference