Simple Clicker

#include <windows.h>

/*
    Code grabbed from http://www.cplusplus.com/forum/lounge/17053/
    I altered it to make it work with the middle click as it's a convinient key
*/

bool KeyIsPressed (unsigned char k)
{
    USHORT status = GetAsyncKeyState(k);
    return (((status & 0x8000) >> 15) == 1) || ((status & 1) == 1);
}

int WINAPI WinMain (HINSTANCE hInst, HINSTANCE P, LPSTR CMD, int nShowCmd)
{
    char k = 0x45;  // 0x45 = E, 0x50 = P; WM_RBUTTONDOWN = Middle click

    while (true) {
        INPUT Input= {0}; // Create our input.
        Input.type = INPUT_MOUSE;

        while ( !KeyIsPressed (k) ) { Sleep (100); }
        while ( KeyIsPressed (k) ) {}
        while ( !KeyIsPressed (k) ) {
            // Let input know we are using the mouse.
            Input.mi.dwFlags = MOUSEEVENTF_LEFTDOWN;  // We are setting left mouse button down.
            SendInput( 1, &Input, sizeof(INPUT) );    // Send the input.

            ZeroMemory( &Input, sizeof(INPUT) );      // Fills a block of memory with zeros.
            Input.mi.dwFlags = MOUSEEVENTF_LEFTUP;    // We are setting left mouse button up.
            SendInput( 1, &Input, sizeof(INPUT) );    // Send the input.

            Sleep (10);
        }
        while ( KeyIsPressed (k) ) {}
    }
    return 0;
}