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exe + dll: In the different versions of TUniQuery use 'Assign', there will be problems?
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FORD EX HISTORY

You cannot use the Assign method of TUniQuery if you pass a TUniQuery object from another module to this method.

In ccc.dll: (unidac3.0.0.3)

function GetUniQ: TUniQuery; stdcall;

function GetUniQ: TUniQuery;
begin
UniQuery1.Close;
UniQuery1.SQL.Text:= 'select * from table1';
UniQuery1.Open;
Result:= UniQuery1;
end;

In exe: (unidac4.0.0.1 in the Future)

TGetUniQ=function TUniQuery;stdcall;

function GetUniQuery: TUniQuery;
var HDll: THandle;
PDll: TFarProc;
begin
HDll:= LoadLibrary(pChar('d:\ccc.dll'));
PDll:=GetProcAddress(HDll, 'GetUniQ');
Result:= TGetUniQ(PDll);
end;

procedure TForm1.BitBtn1Click(Sender: TObject);
begin
VirtualTable1.Assign(GetUniQuery);
end;

UniDAC in different versions, 'VirtualTable1.Assign (GetUniQuery);', there is the problem?
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SUZUKI KATANA SPECIFICATIONS

You cannot use the Assign method of TVirtualTable in such way.

Why can not I use? Can you tell me the reason? Because I have now used this way.
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Dodge tomahawk specifications

You cannot pass objects to/from DLL. You can pass only simple types like Integer or String. The only exception is the AssingConnect method of TUniConnection.