I have to smile a little bit, 3 yrs ago Hantek posted on their website "incl. second design", which is nothing else than a SDK, with sample app, libs/headers, etc. Of course they never ever released anything, later they even deleted that "second design" from delivery list. Not that i really need it, we know the communication protocol already (Yes, with Hantek help) but hey, finally seems that (probably Extech pushed them) they released something - look at this link:
hxxp://www.hantek.com/Product/DSO1000B/DSO1000B_SDK.zip
This is SDK (beta1 - and this is why i have to smile, 3 years to get first beta version) for Hantek handhelds, but it does works as well with DSO/MSO hw0 to hw1007. With hw101 (so the very last hardware) i haven't tested, but probably it will work as well.
The sample app and documenation are very basic (yet), but yeah, it is beta.