Send multimedia commands

Question

Is there some way that I can send multimedia control commands like next song, pause, play, vol up, etc. to the operating system? Commands that are sent when pressing Fn

Answer 1

_{Actually, the answer of dxramax gives me erratic behavior. I'm posting this answer that gives me consistent behavior, and also has some more details.}

To send multimedia keys, including Play/Pause, NextTrack, PrevTrack, etc, you can use keybd_event:

public class Program
{
    public const int KEYEVENTF_EXTENTEDKEY = 1;
    public const int KEYEVENTF_KEYUP = 0;
    public const int VK_MEDIA_NEXT_TRACK = 0xB0;
    public const int VK_MEDIA_PLAY_PAUSE = 0xB3;
    public const int VK_MEDIA_PREV_TRACK = 0xB1;

    [DllImport("user32.dll")]
    public static extern void keybd_event(byte virtualKey, byte scanCode, uint flags, IntPtr extraInfo);

    public static void Main(string[] args)
    {
        keybd_event(VK_MEDIA_PLAY_PAUSE, 0, KEYEVENTF_EXTENTEDKEY, IntPtr.Zero);    // Play/Pause

        //keybd_event(VK_MEDIA_PREV_TRACK, 0, KEYEVENTF_EXTENTEDKEY, IntPtr.Zero);  // PrevTrack
        //keybd_event(VK_MEDIA_NEXT_TRACK, 0, KEYEVENTF_EXTENTEDKEY, IntPtr.Zero);  // NextTrack
    }

Here is a list to the supported key codes that this windows api can handle:
https://docs.microsoft.com/en-us/windows/win32/inputdev/virtual-key-codes

The SendKeys class is very nice, but it's also limited. The approach above sends the key command directly to Windows OS.