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MapDialogRect()
Convert dialog co-ordinates to screen (pixel) co-ordinates
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Syntax
MapDialogRect( <hWndDlg>, <aDlgRect> )   -->   aRect

Arguments
<hWndDlg> is the handle of the dialog.

<aDlgRect> is an array containing the co-ordinates of a
rectangle within the dialog, specified in the order  { left,
top, right, bottom }.

Returns
An array  { <nLeft>, <nTop>, <nRight>, <nBottom> } giving the
co-ordinates of the specified rectangle in screen co-ordinates.
Note the order of these co-ordinates may not be what you expect.

Description
This function returns the co-ordinates of a rectangle within a
dialog, converted to screen co-ordinates.

See the GetDialogBasUnits() function for more information on
the relationship between dialog units and screen units (pixels).

Example
// Get the width of part of a dialog
aRect = MapDialogRect( hDlg, { 0, 0, 10, 10 } )
nWidth = aRect[3] - aRect[1]