Port keyplus emulator to windows

[ahtn]

Two approaches that might work:

Method 1 - Input APIs

• Raw Input to read HID codes from devices
• BlockInput to prevent the original behaviour of keys being generated
• SendInput to generate new keyboard/mouse events.

Pros:

• runs in user-space
• should be easy to implement.

Cons:

• BlockInput and SendInput don't work when a UAC prompt is active, nor when Ctrl+Alt+Del combination is used.
• BlockInput blocks all input devices, so need to forward events of all devices that we aren't remapping.
• Might not work correctly with some applications depending on how they handle keyboard input.

Method 2 - Filter driver

Write a Keyboard and Mouse Filter Drivers.

Pros:

• The OS should treat the virtual keyboard and mouse the same way as real hardware.
• Should work in UAC and when Ctrl+Alt+Del is pressed.

Cons:

• Filter drivers run in kernal-space, so harder to work with. A driver crash means the OS crashes, aka BSOD.
• A user-space program to communicate with the driver will be needed, so more complexity.
• Might be harder to install??

Other considerations

Microsoft's C compiler MSCV only has partial support for C99, so some keyplus code may not compile. To work around, will need to either rewrite some code, or compile it as C++ code.