User32GetUpdateRect(SafeHandle, NativeRectangle, Boolean) Method

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

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

Dim hWnd As SafeHandle
Dim refRect As NativeRectangle
Dim erase As Boolean

Dim returnValue As Boolean

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

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

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

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

Parameters

hWnd  SafeHandle

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

refRect  NativeRectangle

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.Runtime.InteropServices.SafeHandle,DevCase.Win32.Structures.NativeRectangle@,System.Boolean)"]

Return Value

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

To get extended error information, call GetLastWin32Error.

Reference