i'm an absolute beginner at c# and i need to make a form that recognises if w a s d is pressd. a portion of the code is this

  [DllImport("user32.dll")]
  internal static extern ushort GetAsyncKeyState(int vKey);
  static void Main(string[] args)
{       ushort down = 32768;
         ushort up=32768;
 while (true)
         { if ((GetAsyncKeyState(0x26)&up)==up)
               MessageBox.Show("up pressed");
               else 
                 //something
           if ((GetAsyncKeyState(0x28)&down)==down)
                //something
               else 
                //something

i managed to make it work (after days) butin console only. can you help me put it in a windows form?
the internet wasn't very helpful, there are a lot of getasynckey examples in vb (even on youtube) and the few that i found in c# were very complicated or gave errors when i tried to put them in quicksharp or c# - i should have modified something to work, but i don't know.
so, please, help me put it in a windows form; just a empty form and when w or up key (whatever suits you) is pressed, a dialog appears, or something.

Using GetAsyncKeyState() requires polling. Which requires a "game loop". You can make one by making your Program.cs file look like this:

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WindowsFormsApplication1 {
class Program {
[STAThread]
static void Main() {
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
new Program().RunGameLoop();
}

Form1 mainForm;

void RunGameLoop() {
mainForm = new Form1();
mainForm.FormClosed += new FormClosedEventHandler(fmain_FormClosed);
mainForm.Show();
while (!mQuit) {
System.Threading.Thread.Sleep(1);
pollKeyboard();
Application.DoEvents();
}
}

private bool mQuit;

void fmain_FormClosed(object sender, FormClosedEventArgs e) {
mQuit = true;
}

void pollKeyboard() {
// You'll probably want to call, say, formMain.MoveLeft() here...
if (GetAsyncKeyState(Keys.S) < 0) Console.WriteLine("moving left");
// etc...
}

[DllImport("user32.dll")]
private static extern short GetAsyncKeyState(Keys key);

}
}

---

Hans Passant.

To clarify, are you trying to determine if W, A, S, D are all held down simultaneously?

Trying to figure out why you think you need to use GetAsyncKeyState instead of another method.

Using GetAsyncKeyState() requires polling. Which requires a "game loop". You can make one by making your Program.cs file look like this:

using System;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace WindowsFormsApplication1 {
class Program {
[STAThread]
static void Main() {
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
new Program().RunGameLoop();
}

Form1 mainForm;

void RunGameLoop() {
mainForm = new Form1();
mainForm.FormClosed += new FormClosedEventHandler(fmain_FormClosed);
mainForm.Show();
while (!mQuit) {
System.Threading.Thread.Sleep(1);
pollKeyboard();
Application.DoEvents();
}
}

private bool mQuit;

void fmain_FormClosed(object sender, FormClosedEventArgs e) {
mQuit = true;
}

void pollKeyboard() {
// You'll probably want to call, say, formMain.MoveLeft() here...
if (GetAsyncKeyState(Keys.S) < 0) Console.WriteLine("moving left");
// etc...
}

[DllImport("user32.dll")]
private static extern short GetAsyncKeyState(Keys key);

}
}

---

Hans Passant.

Hi Vandal,

You can set the KeyPreview property of the Form to true and subscribe the KeyDown event of the Form to get notified when a key is pressed. For example:

public class Form1:Form
{
public Form1()
{
this.KeyPreview = false;
this.KeyDown += new KeyEventHandler(Form1_KeyDown);
}
void Form1_KeyDown(object sender, KeyEventArgs e)
{
MessageBox.Show(e.keyCode.ToString() + " is pressed");
}
}

Hope this helps.

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