converting delphi 2007 code to delphi XE2 -- emptyparam problem
Hi, I am trying to convert my applicantion code from delphi 2007 to delphi XE2 and i got stuck in this error "[DCC Error] ADODB_TLB.pas(4888): E2033 Types of actual and formal var parameters must be identical". This happens when we use emptyparam as an argument in a function that wants an olevariant. Example: function TAcadDatabase.CopyObjects(Objects: OleVariant): OleVariant; begin Result := DefaultInterface.CopyObjects(Objects, EmptyParam, EmptyParam); //this is where we get the ERROR end; The coyobjects function as this signature: " function CopyObjects(Objects: OleVariant; Owner: OleVariant; var IdPairs: OleVariant): OleVariant; safecall; " This sample of code is from a unit that was imported (to *.pas) from a autocad library in delphi 2007. I tryied to import that same library in delphi XE2 and get lots of erros so i decided do use the .pas that i've obtained importing in delphi 2007. But don't work :-( Help please... thank you
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Lara
2/8/2012 2:12:44 PM
embarcadero.delphi.general
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Hi, Did you try to include Variants in that unit? "uses Variants" I had similar problem converting outlook source. Before you didn't have to do "uses Variants" in the unit when using EmptyParam. Greets.
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Robert
2/8/2012 2:43:57 PM
Hi, thank you for your help. I had already included the Variants in that unit and the error persisted.
The only way we found out to solve the problem was to use a local variable of olevariant type, then assigned that variable with EmptyParam and use it to call the function. The examples is below.
function TAcadDocument.CopyObjects(Objects: OleVariant; Owner: OleVariant): OleVariant;
*var*
*argumento: olevariant;*
begin
*argumento := EmptyParam;*
Result := DefaultInterface.CopyObjects(Objects, Owner, argumento);
end;
thank you.
Problem solved! :-)
> {quote:title=Robert Triest wrote:}{quote}
> Hi,
>
> Did you try to include Variants in that unit? "uses Variants"
> I had similar problem converting outlook source. Before you
> didn't have to do "uses Variants" in the unit when using EmptyParam.
>
> Greets.
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Lara
2/8/2012 3:03:35 PM
Hello Lara, > Hi, I am trying to convert my applicantion code from delphi 2007 > to delphi XE2 and i got stuck in this error "[DCC Error] > ADODB_TLB.pas(4888): E2033 Types of actual and formal var > parameters must be identical". In earlier versions, EmptyParam was defined as a global OleVariant variable in both the Variants.pas and OleCtrls.pas units. In XE2, EmptyParam is now defined in both units as a function that returns an OleVariant value. The last parameter of the COM object's function is a 'var' parameter, so it requires a real variable to be passed to it. That is why your D2007 code worked (you were passing a variable where a reference to a variable is expected) and why you have to add a local variable in your XE2 code (you cannot pass EmptyParam()'s result directly to a 'var' parameter). The RTL source in XE2 does have an EMPTYPARAM_VAR define to go back to the old behavior, but I imagine that means you would have to recompile the RTL to enable it. -- Remy Lebeau (TeamB)
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Remy
2/8/2012 5:39:37 PM
> In earlier versions, EmptyParam was defined as a global OleVariant variable > in both the Variants.pas and OleCtrls.pas units. In XE2, EmptyParam is now > defined in both units as a function that returns an OleVariant value. The > last parameter of the COM object's function is a 'var' parameter, so it requires > a real variable to be passed to it. That is why your D2007 code worked (you > were passing a variable where a reference to a variable is expected) and > why you have to add a local variable in your XE2 code (you cannot pass EmptyParam()'s > result directly to a 'var' parameter). Why would they change something so significant? How it this better when earlier code that passes EmptyParam by reference, now has to be fixed? Edited by: Frederic Bell on Feb 18, 2012 9:47 PM Edited by: Frederic Bell on Feb 18, 2012 9:49 PM
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Frederic
2/19/2012 5:49:39 AM
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