Re: ReadFille error caused by USB sniffer

From:

"William DePalo [MVP VC++]" <willd.no.spam@mvps.org>

Newsgroups:

microsoft.public.vc.language

Date:

Mon, 12 Mar 2007 16:57:09 -0400

Message-ID:

<#tIxZkOZHHA.992@TK2MSFTNGP02.phx.gbl>

"HMS Surprise" <john@datavoiceint.com> wrote in message
news:1173729030.390192.305820@h3g2000cwc.googlegroups.com...

I had a ReadFile call for a USB device that worked fine until I
installed a USB sniffer. Then I started getting 1784 error
ERROR_INVALID_USER_BUFFER. The sniffer was not running only installed.
I uninstalled the sniffer and the problem left.

This is only a guess - I don't think there is enough information to go on -
but perhaps the problem is related to timing. Timing bugs are sensitive to
what all else is going on in the machine. So, I'd suggest that you look at
the code to see if there is a wild-pointer problem or buffer that gets
deleted or goes out of scope before the I/O completes.

I should have started by asking a more basic question as I come from a
Unix background. On one of the MSDN library page for ReadFile,
http://msdn2.microsoft.com/en-us/library/aa365467.aspx , it says lib
Kernel32.lib is needed as well as Kernel32.dll. Why are both needed?

The .lib file is what is called an import library. It is used at link time
to resolve references (up to a point) to external functions which are
implemented in a DLL. The DLL is a dynamic-link library required at load
time.

I'm told that a DLL is like a "shareable" (.so??????) but I wouldn't know a
shareable if it came up and bit me in the @$$ so take that with a grain of
salt. <g>

Regards,
Will
www.ivrforbeginners.com