writing a keyboard wedge

[Sagaert Johan]

Hi

Can someone point me the good direction to start a project that injects
keycodes, or (scancodes ) into the system as if the came from the keyboard.
(like barcodescanners etc.. do)

Johan

 

[Michael Nemtsev]

Hello Sagaert,

Use SendMessage WinAPI function
http://www.pinvoke.net/default.aspx/coredll/SendMessage.html

SJ> Hi
SJ>
SJ> Can someone point me the good direction to start a project that
SJ> injects keycodes, or (scancodes ) into the system as if the came
SJ> from the keyboard. (like barcodescanners etc.. do)
SJ>
SJ> Johan
SJ>
---
WBR,
Michael Nemtsev [C# MVP] :: blog: http://spaces.live.com/laflour

"At times one remains faithful to a cause only because its opponents do not
cease to be insipid." (c) Friedrich Nietzsche

 

[Lucian Wischik]

S Johan wrote:
SJ> Can someone point me the good direction to start a project that
SJ> injects keycodes, or (scancodes ) into the system as if the came
SJ> from the keyboard. (like barcodescanners etc.. do)
Use SendMessage WinAPI function
http://www.pinvoke.net/default.aspx/coredll/SendMessage.html

I think that normally SendMessage isn't the best way. It's too
targetted and specific, e.g. knowing precisely which window to send
the message to.

SendInput is better. This is a low-level call to "spoof" mouse-clicks
and keyboard presses. I don't know if there's a managed wrapper; I'd
use p-invoke.

Here's an example win32/c++ program I wrote which intercepts the right
alt key, and spoofs a right-mouse-click in response. It shows how I
used SendInput.
http://www.wischik.com/lu/Programmer/Keymouse

 

[Nicholas Paldino [.NET/C# MVP]]

Michael,

This is actually not what you want to do, as it doesn't simulate input
from devices (keyboard, mice, etc, etc).

The OP really wants the SendInput API function that will produce
keyboard input.

Hope this helps.

 

[rossum]

Hi

Can someone point me the good direction to start a project that injects
keycodes, or (scancodes ) into the system as if the came from the keyboard.
(like barcodescanners etc.. do)

Johan

As well as the other suggestions, SendKeys.Send() might be useful for
you. The online help does include a caution however: "If your
application is intended for international use with a variety of
keyboards, the use of Send() could yield unpredictable results and
should be avoided."


rossum

 

[Sagaert Johan]

Thanks ,

I will have a look at it, seems in the direction of my needs.

Michael,

This is actually not what you want to do, as it doesn't simulate input
from devices (keyboard, mice, etc, etc).

The OP really wants the SendInput API function that will produce
keyboard input.

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

Hello Sagaert,

Use SendMessage WinAPI function
http://www.pinvoke.net/default.aspx/coredll/SendMessage.html

SJ> Hi
SJ> SJ> Can someone point me the good direction to start a project that
SJ> injects keycodes, or (scancodes ) into the system as if the came
SJ> from the keyboard. (like barcodescanners etc.. do)
SJ> SJ> Johan
SJ> ---
WBR,
Michael Nemtsev [C# MVP] :: blog: http://spaces.live.com/laflour

"At times one remains faithful to a cause only because its opponents do
not cease to be insipid." (c) Friedrich Nietzsche