How to make virtual input hardware input? - c++

Question

I wanted to make a strafe bot for garry's mod, and I came up with this:
#define WIN32_LEAN_AND_MEAN
#define _WIN32_WINNT 0x0500
#include <windows.h>
#include "stdafx.h"
class KeyBot
{
private:
INPUT _buffer[1];
public:
KeyBot();
void KeyUp(char key);
void KeyDown(char key);
void KeyClick(char key);
};
KeyBot::KeyBot()
{
_buffer->type = INPUT_KEYBOARD;
_buffer->ki.wScan = 0;
_buffer->ki.time = 0;
_buffer->ki.dwExtraInfo = 0;
}
void KeyBot::KeyUp(char key)
{
_buffer->ki.wVk = key;
_buffer->ki.dwFlags = KEYEVENTF_KEYUP;
SendInput(1, _buffer, sizeof(INPUT));
}
void KeyBot::KeyDown(char key)
{
_buffer->ki.wVk = key;
_buffer->ki.dwFlags = 0;
SendInput(1, _buffer, sizeof(INPUT));
}
void KeyBot::KeyClick(char key)
{
KeyDown(key);
Sleep(10);
KeyUp(key);
}
char check_mouse(POINT xOne, POINT xTwo)
{
GetCursorPos(&xOne);
Sleep(1);
GetCursorPos(&xTwo);
if ((xTwo.x - xOne.x) > 0) {
return 'D';
}
else {
if ((xTwo.x - xOne.x) < 0) {
return 'A';
}
else {
if ((xTwo.x - xOne.x) == 0) {
return 'N';
}
}
}
}
int main()
{
KeyBot bot;
POINT xOne;
POINT xTwo;
while (1) {
if (check_mouse(xOne, xTwo) == 'A') {
bot.KeyUp(0x44);
bot.KeyDown(0x41);
}
if (check_mouse(xOne, xTwo) == 'D') {
bot.KeyUp(0x41);
bot.KeyDown(0x44);
}
if (check_mouse(xOne, xTwo) == 'N') {
bot.KeyUp(0x44);
bot.KeyUp(0x41);
}
}
return 0;
}
This works fine, when opening notepad or game chat, it holds a when I move my mouse left, and it holds d when I move my mouse to the right. The problem is, that, when I am in game, it doesn't move my character at all. I think the problem is that this is a virtual key press and not a hardware one, and I don't know how to change this.
can someone modify my code in order for this to work?