autogenerate different getter code for strings and wide strings

[jethac]

I was having some difficulty marshalling a native wide string property into a managed string when I realised the code CodeGenDom was giving me was wrong.

The patch is somewhat self-explanatory - when it's a string, we want to:

1. C-style cast the char* or wchar_t* string pointer (not the address of the pointer), to a void pointer, and
2. Use the appropriate string-length function (strlen / wcslen) instead of sizeof

Seeing as the repository includes the binaries, I thought about providing rebuilt binaries, but it might be easier to merge without them.

[abeckus]

Your changes will break the interface for getting object property.
The size must always be in bytes and data is always is void_.
In C# side you should convert void_ data to string using property encoder.

<code langu
/*

• Gets a property for the specified object and property ID.
• @PARAM typeId Type GUID of the object
• @PARAM propId The property UID to get
• @PARAM instanceId Instance GUID of the object
• @PARAM data[out] Pointer to data to be set
• @PARAM size[out] Pointer to size of data, in bytes
  _/
  extern "C" LVEDRENDERINGENGINE_API void _stdcall LvEd_GetObjectProperty(ObjectTypeGUID typeId, ObjectPropertyUID propId, ObjectGUID instanceId, void* data, int* size);
  

[jethac]

Ahh, breaking the interface would be bad. I'm a little concerned that we're talking past each other at the moment though; with the current pre-patch code, when you have an element in your XSD containing:

<LeGe.NativeProperty name="mystring" nativeName="MyString" nativeType="wchar_t*" access="get">

The auto-generated code will be:

void MyClass_MyString_Get(ObjectGUID instanceId, void** data, int* size)
{
    MyClass* instance = reinterpret_cast<MyClass*>(instanceId);
    static wchar_t* localData;
    localData = instance->GetMyString();
    *data = (void*)&localData;
    *size = sizeof(localData);
}

Which doesn't seem right, seeing as:

• *data will have the location of localData, not the location that localData points to, and
• *size will evaluate to sizeof(wchar_t*), rather than the number of bytes in the string

Is that what was intended?

[abeckus]

Thanks for clarifying it,
I will test the CodeGen with getter of type wchar_t* and fix the issue in the next update.
please make a local fix, until I update master branch.

Alan

[jethac]

Thanks Alan! 😄