On Fri, 6 Aug 2010, Felipe Monteiro de Carvalho wrote:
Hello,
I am interfacing with a server written in Delphi via network and it
sends over data. The server sends some data types, and among the
hardest ones to read are Currency and TDateTime.
The server is undocumented and does some strange transformations of
the data using RTTI to pass properties.
I always though that Currency was a special kind of integer type, but
it seams that RTTI will return tkFloat for it under Delphi. Where is
the internal memory layout of Currency documented? Where is it
declared in the compiler? I couldn't find it...
Strange, because tkCurrency exists ?
A currency is a Int64, which is the currency amount multiplied by 10000.
Similarly, it seams that most often TDateTime=double. Any docs on the
memory layout of TDateTime?
TDateTime IS a double.
The integer part is the number of days since 1/1/1900
The fractional part is the fraction of the day passed since 0:0
I believe this is documented.
I also think this is not a Borland invention, but is introduced by Microsoft for variant datetime values.
Michael.
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