On Tuesday, 12 January 2016 at 19:00:26 UTC, Andre wrote:
Hi,
I am not sure, whether this is a current limitation of the
windows dll functionality of D
or I am doing s.th. which will not work.
I have developed in D a windows DLL which creates class
instances by passing the name (using object.factory method).
In another D application I am using this DLL. My issue is, that
the cast fails, although
typeid(bar).name shows the correct name .
module main;
// these classes are in a seperate module
// used for the dll & for this application
export class Foo {}
export class Bar : Foo {}
class Baz : Bar {}
void main()
{
// this method calls the dll and returns Foo
Foo c = dllCreateClass("main.Baz");
// no failure
assert( typeid(c).name == "main.Baz");
// > fails
if (auto myBar = cast(Bar) c){}
}
Kind regards
André
Thats a limitation of the current dll functionality. The type
info of the class gets duplciated into both your executable and
the dll and thus the cast fails. Until D properly supports Dlls
on windows this is going to stay this way. Currently only a C
like interface across dll boundaries is possible.