AlexeyT via fpc-pascal <fpc-pascal@lists.freepascal.org> schrieb am Mo., 4.
Nov. 2019, 23:40:
> FPC 3.3.1-r43022 [2019/09/16] for Linux x64. This code crashes, because
> fpc sees 'x', 'y' wrong:
>
> Py_BuildValue('{sLsisisisisisisOsOsOsisisisisisO}',
> 'tag',
> Mark.Tag,
> 'x',
> Mark.PosX,
> 'y',
> Mark.PosY,
> 'len',
> Mark.LenX,
>
> I must change it to this, it works ok:
> Py_BuildValue('{sLsisisisisisisOsOsOsisisisisisO}',
> 'tag',
> Mark.Tag,
> PChar(string('x')),
> Mark.PosX,
> PChar(string('y')),
> Mark.PosY,
> 'len',
> Mark.LenX,
>
> Py_BuildValue is from Python-for-Lazarus package.
> Py_BuildValue: function( format: PAnsiChar {;...}): PPyObject;
> cdecl varargs;
>
What did you expect? With varargs the compiler can't do any checks, thus
the types are inserted as is and 'x' *is* a char or maybe a Pascal string,
but by itself *never* a PChar. So the cast is the correct way.
Regards,
Sven
>
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