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GetTextExtent()
Return the width and height of a string using the current font
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Syntax
GetTextExtent( <hDC>, <cText> )   -->   nValue

Arguments
<hDC> specifies the device context for a window.

<cText> is the string.

Returns
A numeric value containing both the width and height of the
string relative to the font currently selected in the
specified device context.

Description
This function returns a numeric value containing both the
width and height (in logical units) of the string relative to
the font currently selected in <hDC>.  The width can be
extracted by the C4W_LoWord() function, and the height can be
extracted by C4W_HiWord().

Example
? C4W_LoWord( GetTextExtent( hDC, cMyString ) )   // the width