Windows utility to swap mouse button orientation between right-handed mouse and left-handed mouse

SwapMouseButtons.cpp

/*
	Simple utility to swap mouse primary mouse buttons.
	Usage:  no arguments -> swap buttons
			l -> set primary mouse button to right button (e.g., left-hand mouse)
			r -> set primary mouse button to left button (e.g., right-hand mouse)
*/
#include "windows.h"
#include <iostream>

using namespace std;

int main(int argc, char* argv[])
{
	// GetSystemMetrics(SM_SWAPBUTTON) is nonzero if buttons are swapped
	// SwapMouseButton(true) to reverse, (false) to normalize
	if (argc > 1)
	{
		switch (argv[1][0])
		{
		case 'l':
		case 'L':
			cout << "Switching primary and secondary buttons." << endl;
			SwapMouseButton(true);
			break;
		case 'r':
		case 'R':
			cout << "Restoring primary and secondary buttons." << endl;
			SwapMouseButton(false);
			break;
		default:
			cout << "Usage: " << argv[0] << " [L|R]" << endl;
			break;
		}
	}
	else
	{
		auto swapped = (GetSystemMetrics(SM_SWAPBUTTON) == 0);
		if (swapped)
		{
			cout << "Primary and secondary buttons were not switched; switching." << endl;
			SwapMouseButton(true);
		}
		else
		{
			cout << "Primary and secondary buttons were switched; restoring." << endl;
			SwapMouseButton(false);
		}
	}
	return 0;
}