AutoHotInterception(AHI) allows you to execute AutoHotkey code in response to events from a *specific* keyboard or mouse, whilst (optionally) blocking the native functionality (ie stopping Windows from seeing that keyboard or mouse event).
In other words, you can use a key on a second (or third, or fourth..) keyboard to trigger AHK code, and that key will not be seen by applications. You can use the *same key* on multiple keyboards for individual actions.
**TAKE CARE** when using this code. Because Interception is a driver, and sits below windows proper, blocking with Interception goes so deep that it can even block CTRL+ALT+DEL etc. As such, it is entirely possible to lock up all input, or at least make life a little difficult.
In general, worst-case scenario would require use of the reset button.
This is less of an issue whilst AHI does not support mouse blocking (As you could probably kill the script with just the mouse), but if/when that happens, the potential is there.
Be wary of making scripts using this code run on startup. Know how to enter "Safe Mode" in windows and disable startup of the scripts. Know mouse alternatives to emergency keyboard actions (Right click on clock for Task Manager!)
3. Copy the `interception.dll` from the folder where you ran the interecption install into the `lib` folder that was created in step (2)
4. Right-click `Unblocker.ps1` in the lib folder and select `Run as Admin`.
This is because downloaded DLLs are often blocked and will not work.
This can be done manually by right clicking the DLLs, selecting Properties, and checking a "Block" box if it exists.
5. Edit the example script, enter the VID and PID of your keyboard
6. Run one of the sample scripts
7. (Optional) The contents of the `lib` folder can actually be placed in one of the AutoHotkey lib folders (eg `My Documents\AutoHotkey\lib` - make it if it does not exist), and the `#include` lines of the sample scripts changed to `#include <AutoHotInterception>`, to enable your AHI scripts to be in any folder, without each needing it's own copy of the library files.
Interception identifies unique devices by an ID. This is a number from 1..21.
Devices 1-10 are always keyboards
Devices 11-21 are always mice
This ID scheme is totally unique to Interception, and IDs may change as you plug / unplug devices etc.
On PC, devices are often identified by VendorID (VID) and ProductID (PID). These are identifiers baked into the hardware at time of manufacture, and are identical for all devices of the same make / model.
Most AHI functions (eg to Subscribe to a key etc) use an Interception ID, so some handy functions are provided to allow you to find the (current) Interception ID of your device, given a VID / PID.
`AHI` is an AHK class that makes it easy to interact with the AutoHotInterception DLL. For example, it wraps `GetDeviceList()` to make it return a normal AHK array. Most of the time you will not need it.
For advanced users, if you wish to directly communicate with the AHI DLL (eg for best possible performance), you can call `AHI.Instance` instead of `AHI` for most functions (eg when sending of synthesized input using `SendMouseMove`).
If you wish to get a list of all available devices, you can call `AHI.GetDeviceList()`, which will return an array of `DeviceInfo` objects, each of which has the following properties:
Subscription Mode overrides Context Mode - that is, if a key on a keyboard has been subscribed to with Subscription Mode, then Context Mode will not fire for that key on that keyboard.
If you subscribe to a key using Subscription mode with the `block` parameter set to true, then send a different key using `SendKeyEvent`, you are transforming that key in a way which is totally invisible to windows (And all apps running on it), and it will respond as appropriate. For example, AHK `$` prefixed hotkeys **will not** be able to tell that this is synthetic input, and will respond to it.