Simulating Keyboard with SendInput C#

Question

I tried to simulate a key from the keyboard for a direct x game with this code:

public static void Send(short Keycode)
{
    INPUT[] InputData = new INPUT[1];

    InputData[0].type = 1;
    InputData[0].ki.wScan = Keycode;
    InputData[0].ki.dwFlags = KEYEVENTF_KEYUP | KEYEVENTF_SCANCODE;
    InputData[0].ki.time = 0;
    InputData[0].ki.dwExtraInfo = IntPtr.Zero;

    SendInput(1, InputData, Marshal.SizeOf(typeof(INPUT)));
}

The problem is, this does not simulate the key. The key isn't pressed.

Yes i tried this, then it simulate the key, but the key isn't released after this. — Hanashi, Jun 03 '15 at 13:41
try to send both events in succession. first down, then up (with a little pause in between) — thumbmunkeys, Jun 03 '15 at 13:53

score 2 · Accepted Answer · answered Jun 03 '15 at 14:15

You need to send a KEYEVENTF_KEYDOWN and then a KEYEVENTF_KEYUP event in order for the game to correctly process the key events.

Leave a little pause in between the sending of the key events.

This is needed if the game is polling the keys, it then has time to recognize the pressed key.

Simulating Keyboard with SendInput C#

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