input.c

#define WINVER 0x0500
#include <windows.h>

void ToogleRecordingKeys()
{
	// This structure will be used to create the keyboard
	// input event.
	INPUT ipAlt;
	INPUT ipF9;

	// Set up a generic keyboard event.
	ipAlt.type = INPUT_KEYBOARD;
	ipAlt.ki.wScan = 0; // hardware scan code for key
	ipAlt.ki.time = 0;
	ipAlt.ki.dwExtraInfo = 0;

	// Set up a generic keyboard event.
	ipF9.type = INPUT_KEYBOARD;
	ipF9.ki.wScan = 0; // hardware scan code for key
	ipF9.ki.time = 0;
	ipF9.ki.dwExtraInfo = 0;

	// Press the "ALT" key
	ipAlt.ki.wVk = 0x12; // virtual-key code for the "a" key
	ipAlt.ki.dwFlags = 0; // 0 for key press
	SendInput(1, &ipAlt, sizeof(INPUT));

	// Press the "F9" key
	ipF9.ki.wVk = 0x78; // virtual-key code for the "a" key
	ipF9.ki.dwFlags = 0; // 0 for key press
	SendInput(1, &ipF9, sizeof(INPUT));

	// Release the "ALT" key
	ipAlt.ki.dwFlags = KEYEVENTF_KEYUP; // KEYEVENTF_KEYUP for key release
	SendInput(1, &ipAlt, sizeof(INPUT));

	// Release the "F9" key
	ipF9.ki.dwFlags = KEYEVENTF_KEYUP; // KEYEVENTF_KEYUP for key release
	SendInput(1, &ipF9, sizeof(INPUT));
}


// Pause for 10 seconds of video.
int main()
{
	ToogleRecordingKeys();
	Sleep(10000);
	ToogleRecordingKeys();

	// Exit normally
	return 0;
}