Re: varptr to structs returns bad pointer value

[vuott@xxxxxxxxxxxx]

He should try keyword "Struct" (obviously with Global declaration of variable structure), not "New".






3 mar 2025, 01:51 da jussi.lahtinen@xxxxxxxxx:

> Oh yes, the problem confirmed.
>
> This raises the error correctly:
>
> Dim a As New myStruct
> Print VarPtr(a)
>
> The interpreter is confused, because there is a public declaration, which is overdriven locally.
>
>
> Jussi
>
> On Mon, Mar 3, 2025 at 2:44 AM Jussi Lahtinen <> jussi.lahtinen@xxxxxxxxx> > wrote:
>
>> If I remember correctly structures cannot be declared locally, they must be at least private... so "mydata = new myStruct" might not be valid. And as Vuott said there is a missing keyword, which isn't even accepted within a function. So... maybe this just creates object instead of structure.
>>
>> Anyway, some error should be raised.
>>
>>
>> Jussi
>>
>>
>> On Mon, Mar 3, 2025 at 2:24 AM <>> vuott@xxxxxxxxxxxx>> > wrote:
>>
>>> He>>>  >>> should>>>  >>> try>>> :Private Extern myFunction(data As Pointer) In "mylib"Public Struct myStruct    result As Long    msg As StringEnd StructPrivate myData As Struct MystructPublic Sub doit2()    myFunction(VarPtr(myData))  End
>>> ----------------------------------------------------------------------------------
>>>
>>>
>>>
>>>
>>>
>>> 2 mar 2025, 22:43 da >>> jussi.lahtinen@xxxxxxxxx>>> :
>>>
>>>>>
>>>>>
>>>>> No this does not pass the correct pointer, I am trying to pass a      generic structure, I want to use pointers.
>>>>>
>>>>>
>>>> I see, it wasn't clear from the example code you gave.  I agree with your implementation plan.
>>>>  
>>>>
>>>>>
>>>>> I am sorry but varptr(xxx)    should return a pointer to the      actual memory containing the structure.
>>>>>
>>>>>
>>>> I agree, but this isn't in the documentation and it seems it is not implemented [cannot find it under void SUBR_varptr(ushort code)
>>>> ]. For the reasons Benoit knows, this is not raising error either. I don't know enough about the implementation details to say more.
>>>> Maybe this can be added.
>>>>
>>>> Jussi
>>>>  
>>>>
>>>
>>>