这个是Variant和Stream相互转换的函数，stream压缩的例子就太多了
procedure VariantToStream(const Data: OleVariant
Stream: TStream);
var
p: Pointer;
begin
p := VarArrayLock(Data);
try
Stream.Write(p^, VarArrayHighBound(Data,1) + 1)
//assuming low bound = 0
finally
VarArrayUnlock(Data);
end;
end;
function StreamToVariant(Stream: TStream): OleVariant;
var
p: Pointer;
begin
Result := VarArrayCreate([0, Stream.Size - 1], varByte);
p := VarArrayLock(Result);
try
Stream.Position := 0
//start from beginning of stream
Stream.Read(p^, Stream.Size);
finally
VarArrayUnlock(Result);
end;
end;
