GweBypassCoredllThunk_t::GetUpdateRgn_I (Windows Embedded CE 6.0)

1/6/2010

This method retrieves the update region of a window by copying it into the specified region. The coordinates of the update region are relative to the upper-left corner of the window; that is, they are client coordinates.

Syntax

static int WINAPI GetUpdateRgn_I(
  HWND hwndThis,
  HRGN hRgn,
  BOOL bErase
);

Parameters

• hwndThis
  [in] Handle to the window with an update region that is to be retrieved.

• hRgn
  [out] Handle to the region to receive the update region.

• bErase
  [in] Boolean that specifies whether the window background should be erased and whether nonclient areas of child windows should be drawn. If this parameter is FALSE, no drawing is done.

Return Value

The return value indicates the complexity of the resulting region. COMPLEXREGION indicates that the region consists of more than one rectangle. ERROR indicates that an error occurred. NULLREGION indicates that the region is empty. SIMPLEREGION indicates that the region is a single rectangle.

Remarks

This method is an internal version of the GetUpdateRgn function.

The bErase parameter is ignored, the window background is not erased and no drawing is done.

The GweBypassCoredllThunk_t::BeginPaint_I method automatically validates the update region, so any call to GweBypassCoredllThunk_t::GetUpdateRgn_I made immediately after the call to GweBypassCoredllThunk_t::BeginPaint_I retrieves an empty update region.

Requirements

See Also

Reference

GweBypassCoredllThunk_t
GetUpdateRgn
GweBypassCoredllThunk_t::BeginPaint_I
GweBypassCoredllThunk_t::GetUpdateRect_I
GweBypassCoredllThunk_t::UpdateWindow_I