AutoHotkey Community

[evl]

Does Windows broadcast a message to all processes when a usb device is plugged in/removed so that a script could just use OnMessage() to catch this (and then perform a check) instead of using a timer to constantly check?

The device in question is a usb microphone ("usb audio" device) so maybe it's different to detecting usb drives.

I've seen this thread (and replied about where I found device info is stored in the registry, in case it helps anyone else):
http://www.autohotkey.com/forum/viewtopic.php?t=6618
(a timer can be used to check this location quite well, but I'd prefer not to check the registry every second - 86400 times a day ) - plus it'd react faster to a message than a timer.

[Paulo]

I don't know for sure if it will work with mics but it works with all my usb devices.

OnMessage(0x219, "notify_change")
Return

notify_change(wParam, lParam, msg, hwnd)
{
MsgBox, %wParam% %lParam% %msg% %hwnd%
}

[Kevin4875]

Wow, how did you've done that?

It works with me too!

[evl]

Excellent! I'd overlooked that message - it catches both connection and disconnection.

For anyone else that needs this in the future:

Here's the MSDN info on WM_DEVICECHANGE:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/devio/base/wm_devicechange.asp

[Goodhue]

What about firewire devices? Is there a different message to use?

[evl]

It probably works too:

[evl]

Also, the wParam value I get is not mentioned on the MSDN page:
0x0007 = DBT_DEVNODES_CHANGED

It was defined in the Dbt.h file (as mentioned on the site) which contains quite a bit of info.

[Tekl]

Hmmm... it seems not always to work with multi card readers when I plug in or remove media cards. Sometimes I'll get a message and sometimes not.
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Tekl

[Geek10000]

Hi. Thak you for the easy oode. I have laptop computer which I use partly at work, partly at home. When I am at home, I use it with an external monitor. Is there anyway to write a scrip that detect if there is a vga cable present in the slot - so that my laptop will change to external output when I connect it at home? Now I have to connect it, wait for half a minute, then press ctrl + alt + f1. Would be brilliant, but I dont know where to start. I have benne searching all the internet without any answears. Thank you in advance. Best.

[[VxE]]

[Geek10000]

Thank you so much. But is it possible to have this code to autmatically detect WHEN I plug in my external screen? So that the computer will send the keystrokes alt + ctrl + F1?

Thank you so much.

[[VxE]]

[Geek10000]

Thank you! I will check as soon as I get home. But when I run this code on my laptop, the messagebox always tells me it is 1 monitor connected. Even if I have plugged in my external monitor in the vga-slot?

[[VxE]]

You need to have the second monitor enabled in your display properties for it to work properly. Otherwise I don't think AHK can detect a monitor being plugged in.
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[M3CSL]