Send Key Strokes to a specific window handle.

Hi,
i wanna do a bot program for a game.This program send key strokes to Game Application.But i got a problem.I only wanna send key to Game Application Window Handle not another active window.I write a class for this but i havent get worked it.Its sending keys only notepad not to game or any other window.Can ya help me for this ? Iam sending ya codes below ; and tell me where is my problem. thanx for ur help.

class SendKeySample
{
private static Int32 WM_KEYDOWN = 0x100;
private static Int32 WM_KEYUP = 0x101;

[return: MarshalAs(UnmanagedType.Bool)]
[DllImport("user32.dll", SetLastError = true)]
static extern bool PostMessage(IntPtr hWnd, int Msg, System.Windows.Forms.Keys wParam, int lParam);

[DllImport("user32.dll", SetLastError = true)]
private static extern IntPtr FindWindowEx(IntPtr hwndParent, IntPtr hwndChildAfter, string lpszClass, string lpszWindow);

public static IntPtr FindWindow(string windowName)
{
foreach (System.Diagnostics.Process p in System.Diagnostics.Process.GetProcesses())
{
if (p.MainWindowHandle != IntPtr.Zero && p.MainWindowTitle.ToLower() == windowName.ToLower())
return p.MainWindowHandle;
}

return IntPtr.Zero;
}

public static IntPtr FindWindow(IntPtr parent, string childClassName)
{
return FindWindowEx(parent, IntPtr.Zero, childClassName, string.Empty);
}

public static void SendKey(IntPtr hWnd, System.Windows.Forms.Keys key)
{
PostMessage(hWnd, WM_KEYDOWN, key, 0);

}
}


Calling Code ;

var hWnd = SendKeySample.FindWindow("Untitled - Notepad");
var editBox = SendKeySample.FindWindow(hWnd, "edit");

SendKeySample.SendKey(editBox, Keys.A);

a simpler way would probably be

Code:

---

[DllImport("User32.Dll", EntryPoint = "PostMessageA")]
        static extern bool PostMessage(
            IntPtr hWnd,
            uint msg,
            int wParam,
            int lParam
            );

        const uint WM_KEYDOWN = 0x100;

        const int WM_a = 0x41;
        const int WM_b = 0x42;
        const int WM_c = 0x43;


        static void Main(string[] args)
        {
            //using Process.GetProcessesByName to get the handle we want 
            Process[] p = Process.GetProcessesByName("notepad"); 
            IntPtr pHandle = p[0].MainWindowHandle; 

            //will write "abc" in the open Notepad window
            PostMessage(pHandle, WM_KEYDOWN, WM_a, 0);
            PostMessage(pHandle, WM_KEYDOWN, WM_b, 0);
            PostMessage(pHandle, WM_KEYDOWN, WM_c, 0);
        }

---

and for a list of the keys just search google for virtual key codes

this code is not working pal :(

Quote:

---

Originally Posted by thorny

this code is not working pal :(

---

mind posting the error?

also, you should probably look into the security features of what ever you're trying to "bot", some games have a lot of restrictions and blocks to make sure people play legit.

no i tried it in NOTEPAD.It does not sendin any key to Notepad.No error no activity from Program.

Hi,

This is a lame way to do it, but it works :)

Code:

---


Microsoft.VisualBasic.Interaction.AppActivate("Untitled - Notepad");
SendKeys.Send ("This is a test.");

---

Just make sure you add a reference to your project Microsoft.VisualBasic



Another way is to use the windows api's to findwindow, and setforgroundwindow. Then sendkeys will go there. Take a look at this project http://www.codeproject.com/KB/cs/SendKeys.aspx

This might be a newbe follow-up question:

I am trying to do exactly the same thing, but from a service application without GUI.

Seems to me that SendKeys only work from within Form object. Is there a way around this?

via API call:
http://msdn.microsoft.com/en-us/library/ms646310.aspx