error using struct content translated with SIP from cpp

[Phil Thompson]

On 18/12/2021 14:59, Marian Thomsen wrote:
> Hello,
> 
> I'm searching for a solution for an encoding error (a possible
> constraint violation) that occures when the following struct is in the
> data to encode.
> I'm trying to pass an ecoded string to company name that turns to
> garbage. This only happens in the first encoding iteration the next
> ones are fine (the string is always the same).
> 
> 
> typedef unsigned char OSUTF8CHAR;
> 
> struct ASN1T_DangerousGoodsExtended {
> 
> %TypeHeaderCode
> #include <ITS-Container.h>
> %End
> 
>    // ...
> 
>    const OSUTF8CHAR* companyName; // <- causes the encoding error
> 
>    // ...
> 
>    ASN1T_DangerousGoodsExtended ();
> } ;
> 
> 
> This is the code extract of the sip translation:
> 
> extern "C" {static PyObject
> *varget_ASN1T_DangerousGoodsExtended_companyName(void *, PyObject *,
> PyObject *);}
> static PyObject *varget_ASN1T_DangerousGoodsExtended_companyName(void
> *sipSelf, PyObject *, PyObject *)
> {
>     const  ::OSUTF8CHAR*sipVal;
>      ::ASN1T_DangerousGoodsExtended *sipCpp = reinterpret_cast<
> ::ASN1T_DangerousGoodsExtended *>(sipSelf);
> 
>     sipVal = sipCpp->companyName;
> 
>     if (sipVal == SIP_NULLPTR)
>     {
>         Py_INCREF(Py_None);
>         return Py_None;
>     }
> 
>     return PyBytes_FromString((char *)sipVal);
> }
> 
> 
> extern "C" {static int
> varset_ASN1T_DangerousGoodsExtended_companyName(void *, PyObject *,
> PyObject *);}
> static int varset_ASN1T_DangerousGoodsExtended_companyName(void
> *sipSelf, PyObject *sipPy, PyObject *sipPySelf)
> {
>     const  ::OSUTF8CHAR*sipVal;
>      ::ASN1T_DangerousGoodsExtended *sipCpp = reinterpret_cast<
> ::ASN1T_DangerousGoodsExtended *>(sipSelf);
> 
>     sipVal = (const unsigned char *)sipBytes_AsString(sipPy);
> 
>     if (PyErr_Occurred() != SIP_NULLPTR)
>         return -1;
> 
>     sipCpp->companyName = sipVal;
> 
>     sipKeepReference(sipPySelf, -65, sipPy);
> 
>     return 0;
> }
> 
> If someone has an idea that could help me, I would be greatflul for an 
> answer.
> 
> Regards
> 
> M.T.

Use the /Encoding/ annotation...

https://www.riverbankcomputing.com/static/Docs/sip/annotations.html#variable-annotation-Encoding

Phil