On 24.11.2014 19:20, MrSmith wrote:
I've got little test here
https://gist.github.com/MrSmith33/8750dd43c0843d45ccf8#file-sharedmodule2-d-L17-L29.
I have one application and two dlls. Application loads both dlls, calls
their factory functions and then passes each IModule instance that it
got from factories to those modules.
Modules then try to cast those IModule refs back to their real
interfaces (ISharedModule1) but i am getting null there.
The different DLLs have different copies of the RTTI for the classes
(you could not link them separately otherwise). Looking for base classes
or derived classes only compares RTTI pointers, so it doesn't find the
target class of a cast in the hierarchy inside another DLL.
A have found a workaround for this by returning a void* pointer to real
interface and it back when needed.
Another workaround for a limited number of classes would be to add
member functions 'ISharedModule1 toSharedModule1() { return null; }' in
IModule and override these 'ISharedModule1 toSharedModule1() { return
this; }' in the appropriate class.
Another, and more major issue is, that when exception is thrown
application fail immediately.
Is it broken on windows, or it is me doing it wrong?
I haven't tried in a while but I think it should work on Win32, but
probably does not on Win64.
