[Ffmpeg-devel] [PATCH] Correct inttypes.h emulation for VisualStudio
Tue Dec 5 23:40:44 CET 2006
On 12/6/06, M?ns Rullg?rd <mru at inprovide.com> wrote:
> "Alexander Chemeris" <ipse.ffmpeg at gmail.com> writes:
> > On 12/6/06, M?ns Rullg?rd <mru at inprovide.com> wrote:
> >> Corey Hickey <bugfood-ml at fatooh.org> writes:
> >> > M?ns Rullg?rd wrote:
> >> >>> There's a computer where I work that has two onboard serial
> >> >>> ports. Windows calls them both COM2, and it can't use either of them.
> >> >> It's sometimes possible to change the numbering from the device
> >> >> manager.
> >> > At the time, as far as I could tell, changing it within the device
> >> > manager was not possible (I did look, but I don't remember the
> >> > details). I just plugged in a USB-->serial adapter and used that
> >> > instead.
> >> What annoys be with USB-serial adapters in windows is that each time
> >> you plug it in, the COM number gets incremented, soon becoming
> >> inaccessible from programs that only offer a choice of COM1-4, and
> >> eventually stops working entirely when it reaches some maximum value.
> > Not exactly. Windows assigns COM port number to pair "USB port + Adapter
> > serial number". So if you plug same adapter to the same USB port it set
> > the same COM port number. :)
> That's probably how it's supposed to work, but it doesn't actually.
> I've seen the very same USB-serial adapter be assigned ever increasing
> numbers each time it's been plugged in.
My Siemens cable (USB-to-COM inside) work as expected.
> > And if you overloaded with adapter instances, you could delete unused ones
> > in Device Manager. And thier COM port numbers will be freed and used
> > if you plug other adapter or the same adapter to other port.
> They don't show up in the device manager so there's no way to delete
> them. The only trace of those numbers is in the dialog for assigning
> port numbers to serial devices, where the old numbers are marked as
May be I tweaked it... But I have option "show hidden devices" in Device
Manager's menu. And if I check it, I see all Flash drives that ever been
plugged in my computer, unplugged USB-to-COMs and many other fun
ghosts. Sometimes, when I'm in bad mood, I clean them all.
> And don't even think about plugging the thing into a different USB
> Oh well, I guess it's supposed to be user friendly in some way ;-)
It's a strange way, cause Flash drive is recognized depending on its
Device Instance Id, without any relation to USB port and device serial num!
More information about the ffmpeg-devel