On Wednesday, 31 December 2014 at 10:26:18 UTC, OlaOst wrote:
Works fine for me on windows, after running 'dub upgrade'.
I tested the SharedLibVersion with a 2.0.1 and a 2.0.3 SDL dll.
With the 2.0.3 dll, I could call functions added in SDL 2.0.2
even when using SharedLibVersion(2, 0, 0) - is this intended
behaviour?
Yes. I guess I wasn't clear about this in my blog post. This
isn't telling Derelict to "only load 2.0.0 functions and ignore
the rest." It's instead saying, "Don't throw any exceptions if
functions from 2.0.1 and 2.0.2 are missing." If you give it a
2.0.1 DLL, it will load 2.0.1 functions. Give it a 2.0.2 DLL and
it will load 2.0.2 functions, regardless of what you pass in
SharedLibVersion. But now you can happily load 2.0.0 and not
worry about SymbolLoadExceptions. See below for the big caveat.
With the 2.0.1 DLL I got the expected 'Failed to load symbol'
error without using the SharedLibVersion, or using
SharedLibVersion(2, 0, 2).
However, if I call one of the functions added in SDL 2.0.2 when
loading the 2.0.1 context, I get an 'object.Error@(0): Access
violation' error. Would it be possible to get a more
informative error message in this case?
That's not a Derelict error message. That's coming from the
system. Keep in mind that Derelict binds to shared libraries via
function pointers, so if any functions aren't loaded, the
corresponding function pointers will be null and you'll get an
Access Violation as a result. You should *only* use the
SharedLibVersion to specify your minimum required version, not as
a "give me whatever you've got" kind of thing like OpenGL. If you
need 2.0.1 functions, but not 2.0.2, then you should be passing
SharedLibVersion( 2,0,1 ), not 2,0,0.
I also recommend that you get in the habit of always passing a
SharedLibVersion to the load method so that you can future-proof
your app. It will always load if you upgrade to take advantage of
bug fixes, no matter which new API functions are added. If yo
don't do this, then an update will cause it to stop loading older
versions and only load the newest. In fact, I would love to
remove the existing load methods completely, but I do need to
maintain back compat.
Highly appreciate your work on Derelict, BTW.
Thanks! And thanks for trying out the new stuff.
