xinput_guide_button.cpp

#pragma comment(lib, "Xinput.lib")

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <Xinput.h>

/*
Ordinal 100:
DWORD XInputGetStateEx(DWORD dwUserIndex, XINPUT_STATE *pState);

Ordinal 101:
DWORD XInputWaitForGuideButton(DWORD dwUserIndex, DWORD dwFlag, unKnown *pUnKnown);

Ordinal 102:
DWORD XInputCancelGuideButtonWait(DWORD dwUserIndex);

Ordinal 103:
DWORD XInputPowerOffController(DWORD dwUserIndex);
*/

#define XINPUT_GAMEPAD_GUIDE 0x0400

typedef DWORD (WINAPI *XInputGetStateExProc)(DWORD dwUserIndex, XINPUT_STATE *pState);

int main()
{
	HMODULE xinput_lib = LoadLibrary("xinput1_3.dll");

	if(xinput_lib == NULL)
	{
		printf("Could not load xinput1_3.dll. Trying xinput1_4.dll...\n");
		
		xinput_lib = LoadLibrary("xinput1_4.dll");

		if(xinput_lib == NULL)
		{
			printf("Could not load xinput1_4.dll\n");
			return 1;
		}
	}
	
	XInputGetStateExProc XInputGetStateEx;
	int XInputGetStateExOrdinal = 100;
	XInputGetStateEx = (XInputGetStateExProc) GetProcAddress(xinput_lib, (LPCTSTR) XInputGetStateExOrdinal);

	if(XInputGetStateEx == NULL)
	{
		printf("Could not find XInputGetStateEx in xinput9_1_0.dll\n");
		return 1;
	}

	XINPUT_STATE state;
	ZeroMemory(&state, sizeof(XINPUT_STATE));
 
	DWORD active_controller = -1;
	for (DWORD i = 0; i < XUSER_MAX_COUNT; ++i)
	{
		XINPUT_STATE state;
		ZeroMemory(&state, sizeof(XINPUT_STATE));
 
		if (XInputGetState(i, &state) == ERROR_SUCCESS)
		{
			printf("Controller %u found\n", i);

			if(active_controller == -1)
			{
				printf("Controller %u is boss.\n");
				active_controller = i;
			}
		}
	}

	if(active_controller == -1)
	{
		printf("No controllers found. Aborting.\n");
		return 1;
	}

	bool running = true;

	while(running)
	{
		XInputGetStateEx(active_controller, &state);

		bool A_button_pressed = ((state.Gamepad.wButtons & XINPUT_GAMEPAD_GUIDE) != 0);

		if(A_button_pressed)
		{
			printf("BUTTON\n");
		}

		Sleep(10);
	}

	return 0;
}

A way to detect if the GUIDE button (the middle xbox logo) on the xbox controller was pressed. This works even when a game is running, which means you can intercept it during a game for your own purposes.