By using this site, you agree to our updated Privacy Policy and our Terms of Use. Manage your Cookies Settings.
424,835 Members | 1,454 Online
Bytes IT Community
+ Ask a Question
Need help? Post your question and get tips & solutions from a community of 424,835 IT Pros & Developers. It's quick & easy.

Keyboard input

P: n/a
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
Nov 13 '05 #1
Share this Question
Share on Google+
4 Replies


P: n/a
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

Nov 13 '05 #2

P: n/a
Hi Ralf,

I have never use it, but I know there is a class named SendKeys in
System.Windows.Forms , take a look at SendKeys.Send() , it may be the
function you are looking for.

Hope this help,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"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

Nov 13 '05 #3

P: n/a
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
--------------------
Content-Class: urn:content-classes:message
From: "Ralf Toender" <ra**@toender.de>
Sender: "Ralf Toender" <ra**@toender.de>
References: <04****************************@phx.gbl>

<O5**************@TK2MSFTNGP10.phx.gbl>
Subject: Re: Keyboard input
Date: Wed, 9 Jul 2003 06:21:10 -0700
Lines: 44
Message-ID: <06****************************@phx.gbl>
MIME-Version: 1.0
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Newsreader: Microsoft CDO for Windows 2000
X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4910.0300
Thread-Index: AcNGHPaQFDpqnapeS+mTyngsQmxdxw==
Newsgroups: microsoft.public.dotnet.languages.csharp
NNTP-Posting-Host: TK2MSFTNGXA08 10.40.1.160
Path: cpmsftngxa06.phx.gbl!TK2MSFTNGP08.phx.gbl! cpmsftngxa09.phx.gblXref: cpmsftngxa06.phx.gbl microsoft.public.dotnet.languages.csharp:167925X-Tomcat-NG: microsoft.public.dotnet.languages.csharp

Super! Thanks - that's it :-)

One more question: to send the keystrokes to another
application it has to get the focus. In one sample I foundthe 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
.


.

Nov 13 '05 #4

P: n/a

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.

--------------------
Content-Class: urn:content-classes:message
From: "Ralf Toender" <ra**@toender.de>
Sender: "Ralf Toender" <ra**@toender.de>
References: <04****************************@phx.gbl> <O5**************@TK2MSFTNGP10.phx.gbl>
<06****************************@phx.gbl>
<8o**************@cpmsftngxa06.phx.gbl>Subject: Re: Keyboard input
Date: Thu, 10 Jul 2003 15:36:44 -0700
Lines: 112
Message-ID: <03****************************@phx.gbl>
MIME-Version: 1.0
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Newsreader: Microsoft CDO for Windows 2000
Thread-Index: AcNHM71Px5vJCP92SZezmHjMhbfXSQ==
X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4910.0300
Newsgroups: microsoft.public.dotnet.languages.csharp
Path: cpmsftngxa06.phx.gbl
Xref: cpmsftngxa06.phx.gbl microsoft.public.dotnet.languages.csharp:168394
NNTP-Posting-Host: TK2MSFTNGXA12 10.40.1.164
X-Tomcat-NG: microsoft.public.dotnet.languages.csharp

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 to
the textBox on the other form, even if the other form is

minimized or
hidden.

//delcare the SendMessage API
public class win32
{
[DllImport("USER32.DLL")]
public static extern int SendMessage

(IntPtr hwnd,int msg,int
character,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_CHAR
message

[NOTE]
mf is a Form object and textBox1 is a TextBox control.

Best regards
Peter Huang
--------------------
Content-Class: urn:content-classes:message
From: "Ralf Toender" <ra**@toender.de>
Sender: "Ralf Toender" <ra**@toender.de>
References: <04****************************@phx.gbl>

<O5**************@TK2MSFTNGP10.phx.gbl>
Subject: Re: Keyboard input
Date: Wed, 9 Jul 2003 06:21:10 -0700
Lines: 44
Message-ID: <06****************************@phx.gbl>
MIME-Version: 1.0
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-Newsreader: Microsoft CDO for Windows 2000
X-MimeOLE: Produced By Microsoft MimeOLE V5.50.4910.0300
Thread-Index: AcNGHPaQFDpqnapeS+mTyngsQmxdxw==
Newsgroups: microsoft.public.dotnet.languages.csharp
NNTP-Posting-Host: TK2MSFTNGXA08 10.40.1.160
Path: cpmsftngxa06.phx.gbl!TK2MSFTNGP08.phx.gbl!cpmsftngxa09.phx.gblXref: cpmsftngxa06.phx.gblmicrosoft.public.dotnet.languages.csharp:167925X-Tomcat-NG: microsoft.public.dotnet.languages.csharp

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
.


.


Nov 13 '05 #5

This discussion thread is closed

Replies have been disabled for this discussion.