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 GetTextHeight    Retrieves text Height for a specific font object
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 Syntax:          <oPrn>:GetTextHeight( <cText>, <oFont> ) --> <nHeight>

 Parameters:

 <cText>          The text to retrieve its height.

 <oFont>          A font object. By default it uses the default font
                  oFont of the printer object. To create it use:

                  DEFINE FONT oFont NAME ... SIZE ...

 Returns:         The height for that specified font. In fact, this
                  height it is not depending on the text, but just on
                  the font object.