WinXP dev.write: The parameter is incorrect

[dportabella]

Hello,

I've used hidapi in Mac and it works great!
However, when I try it in WinXP, the dev.write operation fails with a "The parameter is incorrect" message.
(it enumerates the devices correctly, it opens my device correctly, but dev.write fails)

I've compiled it with the free version of visualstudio:
http://www.microsoft.com/visualstudio/en-us/products/2010-editions/visual-cpp-express

and also with MinGW.

Any idea?
What can I look at?

Regards,
David

[signal11]

On 08/12/2011 01:34 PM, dportabella wrote:

with a "The parameter is incorrect" message.
(it enumerates the devices correctly, it opens my device correctly, but dev.write fails)

The report number at the beginning is wrong. Make sure the first byte is
the report number. There are cases where it will appear to work on Mac
if you don't do this, but it's really just a quirk in the way it has to
be implemented. Experiment with the test GUI until you get it right.

Alan.

[dportabella]

Thanks for the prompt answer!

You are right; my application didn't send the right report, but it was working somehow in mac.
Now that the application is corrected, it works both in mac and win.

Many thanks,
David