in_pAsEngine->RegisterObjectType("CString", sizeof(CString)+16, asOBJ_CLASS); // If put sizeof(CString) == 4 // < 16 then it bugs on concatenate strings
RegisterBStr(in_pAsEngine);
in_pAsEngine->RegisterObjectBehaviour("CString", asBEHAVE_CONSTRUCT, "void f()", asFUNCTIONP(CString_Constructor, (CString &)), asCALL_CDECL_OBJLAST);
in_pAsEngine->RegisterObjectBehaviour("CString", asBEHAVE_CONSTRUCT, "void f(const bstr &)", asFUNCTIONP(CString_Constructor, (asBSTR &, CString &)), asCALL_CDECL_OBJLAST);
in_pAsEngine->RegisterObjectBehaviour("CString", asBEHAVE_CONSTRUCT, "void f(const string &)", asFUNCTIONP(CString_Constructor, (string &, CString &)), asCALL_CDECL_OBJLAST);
in_pAsEngine->RegisterObjectBehaviour("CString", asBEHAVE_CONSTRUCT, "void f(const bstr &, int)", asFUNCTIONP(CString_Constructor, (asBSTR &, int, CString &)), asCALL_CDECL_OBJLAST);
in_pAsEngine->RegisterObjectBehaviour("CString", asBEHAVE_CONSTRUCT, "void f(const uint8 &)", asFUNCTIONP(CString_Constructor, (BYTE &, CString &)), asCALL_CDECL_OBJLAST);
in_pAsEngine->RegisterObjectBehaviour("CString", asBEHAVE_DESTRUCT, "void f()", asFUNCTION(CString_Destructor), asCALL_CDECL_OBJLAST);
in_pAsEngine->RegisterObjectBehaviour("CString", asBEHAVE_ASSIGNMENT, "CString &f(const bstr &)", asFUNCTION(asCStringCopy), asCALL_CDECL_OBJLAST);
in_pAsEngine->RegisterObjectBehaviour("CString", asBEHAVE_ASSIGNMENT, "CString &f(const CString &)", asFUNCTION(asCStringCopyCString), asCALL_CDECL_OBJLAST);
in_pAsEngine->RegisterObjectBehaviour("CString", asBEHAVE_ASSIGNMENT, "CString &f(const string &)", asFUNCTION(asCStringCopyString), asCALL_CDECL_OBJLAST);
in_pAsEngine->RegisterObjectBehaviour("CString", asBEHAVE_ADD_ASSIGN, "CString &f(const bstr &)", asFUNCTION(asCStringAppend), asCALL_CDECL_OBJLAST);
in_pAsEngine->RegisterObjectBehaviour("CString", asBEHAVE_ADD_ASSIGN, "CString &f(const CString &)", asFUNCTION(asCStringAppendCString), asCALL_CDECL_OBJLAST);
// THE crashing function ...
in_pAsEngine->RegisterGlobalBehaviour(asBEHAVE_ADD, "CString f(const CString &, const CString &)", asFUNCTION((CString(*)(const CString*,const CString*))asCStringConcatenate), asCALL_CDECL);
...
CString asCStringConcatenate(const CString *left, const CString *right)
{
return ((*left) + (*right));
}
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Strange effect in 1.10
Author
Hello,
While cleaning my code for ducmentation purpose I have realized that I was making a mistake in registring an object. the sizeof of the object wasn't the good one.
The object referecing was the MFC CString.
It's sizeof return 4 while I was declaring it with a sizeof = 16 .
After having made the modification, the ADD operator stop working passing a null value as the second parameter ?!
I have returned the sizeof to 16 and the ADD operator works again.
The ADD operator is declared a CDECL.
The difference between the two sizeof was that when sizeof = 4 the CallCDeclFunction is called rather than when it's sizeof = 16 the CallCDeclFunctionRetByRefObjFirst_impl is called.
Does anybody can give me a reason ?
Thanks,
AbrKen.
You need to register the CString with the correct flags. I believe it should be:
This will tell AngelScript that the CString has a constructor, destructor, and an assignment operator in C++, and will thus use the correct calling convention when calling functions that return a CString by value.
With the flag that you used AngelScript, believes that the CString is a plain data structure, and that C++ will return it in the EAX register just like a primitive value.
It works with size 16, because that is more than fits in the EAX:EDX registers, thus the calling convention is the same as for objects with constructors, destructors, or assignment operators.
Regards,
Andreas
in_pAsEngine->RegisterObjectType("CString", sizeof(CString), asOBJ_CLASS_CDA);This will tell AngelScript that the CString has a constructor, destructor, and an assignment operator in C++, and will thus use the correct calling convention when calling functions that return a CString by value.
With the flag that you used AngelScript, believes that the CString is a plain data structure, and that C++ will return it in the EAX register just like a primitive value.
It works with size 16, because that is more than fits in the EAX:EDX registers, thus the calling convention is the same as for objects with constructors, destructors, or assignment operators.
Regards,
Andreas
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