Parses a string into a value and conversion type.
function StrToConvUnit(AText: string; out AType: TConvType): Double;
Double StrToConvUnit(AnsiString AText, TConvType AType);
ConvUtils
Call StrToConvUnit to reverse the conversion performed by the ConvUnitToStr function.
AText is the string to parse. It should represent a numeric value followed by the name of a conversion type. For example, '2.5 hours'.
AType returns the identifier for the conversion type (unit of measurement).
StrToConvUnit returns the number of units (the numeric portion of the string).
If AText can't be parsed into a value and conversion type, StrToConvUnit raises an EConversionError exception.
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