Sets the GDI pen for the background rules or grid lines.
Not used; must be 0.
Contains a handle to a GDI pen used to draw the grid lines.
Returns IER_OK if successful; otherwise, returns IER_PARAMERR to indicate that wParam
Rules and grids are painted after the background and before the ink (and the
IN_PREPAINT notification), and are treated separately from both. A GDI pen, if
specified, becomes the property of the ink edit control and must not be deleted
or otherwise used by the application. If the application needs to change the
settings, it must create a new pen each time it sends the IE_SETGRIDPEN message.
The default setting is for no grid lines. The grid lines act purely as guides
for the user; the ink does not interact with the grid in any way. The
specification of the grid lines is in the MM_TEXT mapping mode (that is, display pixel).
If the GDI pen handle is NULL, the ink edit control will use a default pen.
(The default pen attributes are a solid line, a width of 1 pixel, and the window
grayed text color.) The maximum grid spacing is 255 pixels.
IE_GETBKGND, IE_GETGRIDORIGIN, IE_GETGRIDPEN, IE_GETGRIDSIZE,
IE_SETGRIDORIGIN, IE_SETGRIDSIZE, IE_SETBKGND
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