mirror of
https://gitlab.com/freepascal.org/fpc/source.git
synced 2025-04-05 08:18:12 +02:00
5e129b4ac5
explicitly typecasting a qword to single/currency/tdatetime is no different
from assigning it directly, since integer types are assignment-compatible
with floating point types (mantis #25170)
git-svn-id: trunk@26146 -
85 lines
1.9 KiB
ObjectPascal
85 lines
1.9 KiB
ObjectPascal
{ %opt=-Sa }
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{$mode objfpc}
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program write_read_date;
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// Problem - when write date and read date using binary object reader/writer,
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//readed value is not same as writed
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uses
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classes, sysutils, dateutils;
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type
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// just for access protected ReadQWord
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TBinaryObjectReaderFake = class(TBinaryObjectReader)
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end;
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procedure test;
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var
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mS: TMemoryStream;
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mW: TBinaryObjectWriter;
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mR: TBinaryObjectReaderFake;
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mDateIn, mDateOut, mDateOut2: TDateTime;
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mQW: QWord;
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begin
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// for date 41488.5270635417 is content of stream [$11, $50, $5C, $B4, $DD, $10, $42, $E4, $40]
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// which is OK, so with write is probably no problem
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mDateIn := 41488.5270635417;
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mS := TMemoryStream.Create;
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try
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//
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mW := TBinaryObjectWriter.Create(mS, 100);
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try
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mW.WriteDate(mDateIn);
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finally
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mW.Free
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end;
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// this will read bad date
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mS.Position := 0;
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mR := TBinaryObjectReaderFake.Create(mS, 100);
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try
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Assert(mR.ReadValue = vaDate);
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mDateOut := mR.ReadDate;
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finally
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mR.Free
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end;
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// when use ReadQWord, date is readed correctly
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mS.Position := 0;
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mR := TBinaryObjectReaderFake.Create(mS, 100);
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try
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Assert(mR.ReadValue = vaDate);
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mQW := mR.ReadQWord;
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// typecast will not help
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//mDateOut2 := TDateTime(mQW);
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Move(mQW, mDateOut2, SizeOf(mQW));
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finally
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mR.Free
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end;
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finally
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mS.Free;
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end;
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if CompareDateTime(mDateIn, mDateOut) <> 0 then
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begin
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writeln(qword(mDateIn),' <> ',qword(mDateOut));
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Writeln('read date is different from written date');
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halt(1);
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end
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else
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Writeln('read date is same as written date');
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if CompareDateTime(mDateIn, mDateOut2) <> 0 then
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begin
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Writeln('this situation should not happen');
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halt(2);
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end
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else
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Writeln('read date as QWord is same as written date')
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end;
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begin
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test;
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end.
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