Hi Ralf,
It is not easy to control an application from another application because
the other application may be very complicated. If you really want to do so,
you may call the FindWindow and FindWindowEx APIs to get the handle of the
button on the form in another application, then call the SendMessage API to
send KeyDown and KeyUp Messages to the button. Here is some simple code.
//here is the API declare
public class win32
{
[DllImport("USER32.DLL")]
public static extern int SendMessage(IntPtr hwnd,int
msg,int character,int count);
[DllImport("USER32.DLL")]
public static extern int PostMessage(IntPtr hwnd,int
msg,int character,int count);
[DllImport("USER32.DLL")]
public static extern int SendNotifyMessage(IntPtr hwnd,int
msg,int character,int count);
[DllImport("USER32.DLL")]
public static extern IntPtr FindWindow(
string lpszClass, // class name
string lpszWindow // window name
);
[DllImport("USER32.DLL")]
public static extern IntPtr FindWindowEx(
IntPtr hwndParent, // handle to parent window
IntPtr hwndChildAfter, // handle to child window
string lpszClass, // class name
string lpszWindow // window name
);
}
//here is about how to invoke the API function.
//you may get the window class name via the spy++ include in Visual
Studio .NET
IntPtr phwnd =
win32.FindWindow("WindowsForms10.Window.8.app3","F orm1");//"button1");
IntPtr hwnd = win32.FindWindowEx(phwnd,IntPtr.Zero
,"WindowsForms10.BUTTON.app3","button1");//"button1");
win32.SendMessage(hwnd,0x0100,0x20,0);//0x0100 is KeyDown,0x20 is
Space key
win32.SendMessage(hwnd,0x0101,0x20,1);//0x0101 is KeyUp
Hope this will help you.
Best regards
Peter Huang
=============
This posting is provided "AS IS" with no warranties, and confers no rights.
--------------------
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<8o**************@cpmsftngxa06.phx.gbl>Subject: Re: Keyboard input
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Hi Peter!
Thanks a lot! What about 2 apps - one playing the keyboard
and the other is the controlled one? For example one is a
touchscreen controlling the other app?
Cheers Ralf
-----Original Message-----
Hi Ralf,
I have tested a demo that I can send the WM_CHAR message
from one form tothe textBox on the other form, even if the other form is
minimized orhidden.
//delcare the SendMessage API
public class win32
{
[DllImport("USER32.DLL")]
public static extern int SendMessage
(IntPtr hwnd,int msg,intcharacter,int count);
}
//Use the following code to call the API to send
the message win32.SendMessage
(mf.textBox1.Handle,0x0102,65,1); //0x0102 is the WM_CHARmessage
[NOTE]
mf is a Form object and textBox1 is a TextBox control.
Best regards
Peter Huang
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Sender: "Ralf Toender" <ra**@toender.de>
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<O5**************@TK2MSFTNGP10.phx.gbl>Subject: Re: Keyboard input
Date: Wed, 9 Jul 2003 06:21:10 -0700
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Super! Thanks - that's it :-)
One more question: to send the keystrokes to another
application it has to get the focus. In one sample Ifoundthe combination: Hide () ... Show () but this makes the
form flicker. How can I give the focus back to the other
application which is running and waiting for the strokes
to come? Some kind of Deactivate () or something like
SetFocus ( FindWindow ( ... ) );
Thanks
Ralf
-----Original Message-----
Ralf,
Your best bet would be to use the SendKeys class to
send keyboard
strokes to your application.
Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- ni**************@exisconsulting.com
"Ralf Toender" <ra**@toender.de> wrote in message
news:04****************************@phx.gbl. ..
> Hi!
>
> Does anybody know how to send a keystroke C#? In C++
it's
> done by: keybd_event ( ... ) or SendInput ( ... ).
> What namespace does include this counterpart?
>
> Thanks
>
> Ralf
.
.
