variable that is nil is used and cause exception

dcoun · Yesterday 11:41:22

mormot.core.collections, line 902

if fDynArray.Info.ArrayRtti is nil then fDynArray.Info.ArrayRtti.Kind will cause exception
I have random errors from that

constructor TIListParent.CreateRtti(aDynArray: TRttiCustom;
aItemTypeInfo: PRttiInfo; aOptions: TListOptions; aSortAs: TRttiParserType);
begin
fDynArray.InitRtti(aDynArray, fValue, @fCount);
aSortAs := fDynArray.SetParserType(aSortAs, // aSortAs=ptNone->RTTI
loCaseInsensitive in fOptions);
if (fDynArray.Info.ArrayRtti = nil) or
(fDynArray.Info.ArrayRtti.Kind <> aItemTypeInfo^.Kind) then
EIList.RaiseUtf8('%.Create<%> (%) does not match % (%)',
[self, aItemTypeInfo^.RawName, ToText(aItemTypeInfo^.Kind)^,
aDynArray.Info^.RawName, ToText(fDynArray.Info.ArrayRtti.Kind)^]);

ab · Yesterday 16:13:22

Which compiler?
Which array type?

I guess there is not enough RTTI for this.

dcoun · Yesterday 21:56:59

@ab, Delphi 11.3 in a Torm class
but:
if (fDynArray.Info.ArrayRtti = nil) or
(fDynArray.Info.ArrayRtti.Kind <> aItemTypeInfo^.Kind) then
EIList.RaiseUtf8('%.Create<%> (%) does not match % (%)',
[self, aItemTypeInfo^.RawName, ToText(aItemTypeInfo^.Kind)^,
aDynArray.Info^.RawName, ToText(fDynArray.Info.ArrayRtti.Kind)^]);

ab · Today 07:40:51

I still don't understand how you defined the IList instance.

dcoun · Today 09:19:29

Apologies Ab, I did not define anything new
I noticed that this happens since the updates in github after 3/11/25
The exception I get is in EIList.RaiseUtf8 and when debugging the fDynArray.Info.ArrayRtti is nil

dcoun · Today 09:52:25

ab wrote:

I still don't understand how you defined the IList instance.

I was using NewPlainList instead of NewList, as I notice now.
But still, in the above code if fDynArray.Info.ArrayRtti = nil, then the fDynArray.Info.ArrayRtti.Kind in EIList.RaiseUtf8 will give exception

mORMot Open Source

#1 Yesterday 11:41:22

variable that is nil is used and cause exception

#2 Yesterday 16:13:22

Re: variable that is nil is used and cause exception

#3 Yesterday 21:56:59

Re: variable that is nil is used and cause exception

#4 Today 07:40:51

Re: variable that is nil is used and cause exception

#5 Today 09:19:29

Re: variable that is nil is used and cause exception

#6 Today 09:52:25

Re: variable that is nil is used and cause exception

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