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Simulating keystrokes for directx application

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Hello, I am trying to create a keystorke simulator to control games like NFS World. I tried using SendInpu, and it works great for notepad and explorer window but doesn't for for directx applications. Here my code, it sends DOWN key every 1 second:

#include <Windows.h>
#pragma comment (lib, "Winmm.lib")
#define DIKEY_DOWN 0x04D0
int main() {
KEYBDINPUT keyB = {0};
keyB.wScan = DIKEY_DOWN;
in.ki = keyB;
DWORD prevTime = timeGetTime();
DWORD currTime;
while (true) {
if (GetAsyncKeyState(VK_ESCAPE) & 0x8000) break;
currTime = timeGetTime();
if ((currTime - prevTime) >= 1000) {
SendInput(1, &in, sizeof(in));
prevTime = currTime;
return 0;

I am testing this code in Windows 7.

So, are there anyway to simulate key that works for directx applications? Thanks...

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Whoops, nevermind. It's working now. I guess the sizeof(in) should have been sizeof(INPUT). Silly mistake. lol

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