Interception is a low-level keyboard and mouse hooking library for Windows. It allows developers to intercept and manipulate input device events, providing a powerful tool for creating custom input handling solutions, macro systems, or advanced input processing applications.

Pros

• Low-level access to keyboard and mouse events
• Supports a wide range of input devices, including specialized gaming peripherals
• Provides both C and C++ APIs for flexibility
• Allows for creating complex input manipulation systems

Cons

• Windows-only, limiting cross-platform compatibility
• Requires administrative privileges to install and run, which may pose security concerns
• Limited documentation and examples available
• Potential for misuse in creating malicious software

Code Examples

1. Intercepting keyboard events:

#include <iostream>
#include "interception.h"

int main()
{
    InterceptionContext context;
    InterceptionDevice device;
    InterceptionStroke stroke;

    context = interception_create_context();

    interception_set_filter(context, interception_is_keyboard, INTERCEPTION_FILTER_KEY_DOWN | INTERCEPTION_FILTER_KEY_UP);

    while (interception_receive(context, device = interception_wait(context), &stroke, 1) > 0)
    {
        if (interception_is_keyboard(device))
        {
            InterceptionKeyStroke &keystroke = *(InterceptionKeyStroke *) &stroke;
            std::cout << "Key event: " << keystroke.code << " " << (keystroke.state & INTERCEPTION_KEY_UP ? "up" : "down") << std::endl;
        }
    }

    interception_destroy_context(context);
    return 0;
}

2. Intercepting mouse events:

#include <iostream>
#include "interception.h"

int main()
{
    InterceptionContext context;
    InterceptionDevice device;
    InterceptionStroke stroke;

    context = interception_create_context();

    interception_set_filter(context, interception_is_mouse, INTERCEPTION_FILTER_MOUSE_MOVE | INTERCEPTION_FILTER_MOUSE_BUTTON_DOWN | INTERCEPTION_FILTER_MOUSE_BUTTON_UP);

    while (interception_receive(context, device = interception_wait(context), &stroke, 1) > 0)
    {
        if (interception_is_mouse(device))
        {
            InterceptionMouseStroke &mousestroke = *(InterceptionMouseStroke *) &stroke;
            std::cout << "Mouse event: x=" << mousestroke.x << ", y=" << mousestroke.y << ", state=" << mousestroke.state << std::endl;
        }
    }

    interception_destroy_context(context);
    return 0;
}

3. Sending a simulated key press:

#include "interception.h"

int main()
{
    InterceptionContext context;
    InterceptionDevice device;
    InterceptionKeyStroke keystroke;

    context = interception_create_context();

    device = interception_wait(context);
    
    keystroke.code = 0x1E; // 'A' key
    keystroke.state = INTERCEPTION_KEY_DOWN;
    interception_send(context, device, (InterceptionStroke *)&keystroke, 1);

    keystroke.state = INTERCEPTION_KEY_UP;
    interception_send(context, device, (InterceptionStroke *)&keystroke, 1);

    interception_destroy_context(context);
    return 0;
}

Getting Started

1. Download and install the Interception driver from the project's GitHub repository.
2. Include the Interception header files in your project.
3. Link against the Interception library.
4. Use the provided API functions to create a context, set filters, and handle input events.
5. Compile and run your program with administrative privileges.

Note: Ensure you have the necessary development tools and Windows SDK installed for compiling C/C++ applications.