[Libusb-win32-devel] Antwort: 64-bit support

[Stephan M. <Ste...@ia...>]

> Hi all,
> 
> I know this is an oft asked question, but I did some searching on the
> mailing list and did not find very clear answers to a few questions
> that I had.  I'd appreciate if anyone here can help clarify these
> issues for me:
> 
> 1) What is the build process for a 64-bit version of libusb-win32?
> There were no clear steps that I saw.  Does a DDK have to be
> installed?  Which one?  What compiler is to be used?  A short bullet
> list of what to do here would be much appreciated.

* install the latest DDK
* open a DDK 64bit build environment
* download libusb-win32's latest sources
* navigate to the ddk_make folder
* run make_all.bat from the DDK's build environment

> 
> 2) If I do build the 64-bit version of the sys and dll, can I use the
> unaltered 32-bit version of the dll for use by 32-bit applications on
> the 64-bit OS?

Yes you can. Just copy the 32bit DLL to Windows' 'syswow64' folder.

> 
> 3) I have read in numerous posts that the 64-bit libusb-win32 will not
> work on Vista 64 due to the lack of a signed driver.  It seems that as
> long as I have a VeriSign certificate, I should be able to sign the
> driver.  Has anyone tried this and been able to use libusb-win32 on a
> Vista 64 machine as a result?

I haven't tested this yet.

> 
> 4) I know there is an effort to move to winusb.sys but it seems like
> progress on this has been slow.  Is there a way the libusb-win32 can
> have a stop gap in the meantime?  For example, is the libusb-win32
> development team open to having a company sponsor the fees required to
> obtaining a VeriSign certificate so that any future released versions
> of the libusb-win32 64-bit drivers are properly signed?

It's not possible to sign just a driver (.sys file).
You always have to sign the combination of the driver and the device
specific .inf file. 

> 
> I look forward to some information on this topic.  Thank you in advance.
> 
> Best regards,
> Paarvai
> 
> 
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