'How to use GetAsyncKeyState in C#?

I want to know how to use it....I want to say that if I Click Up and Right Arrow (Form1_KeyDown Event) then timer1.Start(); and When I release the Up and Right Arrow (Form1_KeyUp Event) then timer1.Stop();

I have already Imported the "User32.dll"

using System.Runtime.InteropServices;

[DllImport("User32.dll")]
public static extern short GetAsyncKeyState(Keys ArrowKeys);

so How to use it...I see a lot of website but can't get it

c++sharp


Solution 1:[1]

Here is how you can use it

int keystroke;

byte[] result = BitConverter.GetBytes(GetAsyncKeyState(keystroke));

if (result[0] == 1)
    Console.Writeline("the key was pressed after the previous call to GetAsyncKeyState.")

if (result[1] == 0x80)
    Console.Writeline("The key is down");

Solution 2:[2]

Implement IMessageFilter for you Form and track when the Up/Right Arrows are toggled:

public partial class form1 : Form, IMessageFilter 
{

    public form1()
    {
        InitializeComponent();
        Application.AddMessageFilter(this);
    }

    private bool UpDepressed = false;
    private bool RightDepressed = false;

    private const int WM_KEYDOWN = 0x100;
    private const int WM_KEYUP = 0x101;

    public bool PreFilterMessage(ref Message m)
    {
        switch (m.Msg)
        {
            case WM_KEYDOWN:
                if ((Keys)m.WParam == Keys.Up)
                {
                    UpDepressed = true;
                }
                else if ((Keys)m.WParam == Keys.Right)
                {
                    RightDepressed = true;
                }
                break;

            case WM_KEYUP:
                if ((Keys)m.WParam == Keys.Up)
                {
                    UpDepressed = false;
                }
                else if ((Keys)m.WParam == Keys.Right)
                {
                    RightDepressed = false;
                }
                break;
        }

        timer1.Enabled = (UpDepressed && RightDepressed);
        label1.Text = timer1.Enabled.ToString();

        return false;
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        label2.Text = DateTime.Now.ToString("ffff");
    }

}

Solution 3:[3]

change

[DllImport("User32.dll")]
public static extern short GetAsyncKeyState(Keys ArrowKeys);

to

[DllImport("User32.dll")]
public static extern bool GetAsyncKeyState(Keys ArrowKeys);

async key state should be a bool not a short

Sources

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Source: Stack Overflow

Solution Source
Solution 1
Solution 2 Idle_Mind
Solution 3 SoarCheats

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