.NET (Core and Framework)

5-Oct-13 22:43

Guys i have tried designing a quite different application using vb.net.The function of this application is to detect whick key is pressed in keyboard even when my application is minimised.
for example if iam using notepad to type some text i have to press the keys for giving input to the notepad while pressing each key my application has to detect which key is pressed.

All these are working in my own textbox(I have used key press event for this). but it is not working in other apps and also when it is minimized.

how to solve this problem
Help me Guyzzzz........

Eddy Vluggen6-Oct-13 0:46

6-Oct-13 0:46

srinivasankrishnaa wrote:
but it is not working in other apps and also when it is minimized.

Because your app does not have input-focus.

srinivasankrishnaa wrote:
The function of this application is to detect whick key is pressed in keyboard even when my application is minimised.

What you want is a keylogger; this can't be done using events, as Windows does not generate events in your app for things that are happening to other apps.

Code for a keylogger can be found anywhere on the internet. A word of warning though; depending on your location, you'd need to inform the user and/or get his permission to run this software.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

Dave Kreskowiak6-Oct-13 4:27

Dave Kreskowiak

6-Oct-13 4:27

Google for "VB.NET Global Keyboard Hook".

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

srinivasankrishnaa7-Oct-13 2:53

7-Oct-13 2:53

As you have suggested i have designed a keylogger using "asynckeystate" function but it is Not detecting semicolon,colon,braces,and whether small letters or capital letters etc.
How to solve this.

Dave Kreskowiak7-Oct-13 3:44

Dave Kreskowiak

7-Oct-13 3:44

I have no idea as we haven't seen your code. Without seeing the RELEVENT parts of the code, it's impossible to tell you what's going wrong.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

srinivasankrishnaa7-Oct-13 4:32

7-Oct-13 4:32

Here is my code:-

Public Class Form1

Public Declare Function GetAsyncKeyState Lib "user32" (ByVal vkey As Int32) As Short

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick

Dim k1, k2, k3, k4, k5, k6, k7, k8, k9, k10, k12, k13 As Boolean

k1 = GetAsyncKeyState(Keys.A)
k2 = GetAsyncKeyState(Keys.LControlKey)
k3 = GetAsyncKeyState(Keys.RControlKey)
k4 = GetAsyncKeyState(Keys.F1)
If k1 = True Then
MsgBox("Key A is Pressed")
End If

If k2 = True Then
MsgBox("Key Lcontorl is Pressed")
End If

If k3 = True Then
MsgBox("Key Rcontorl is Pressed")
End If

If k4 = True Then
MsgBox("key F1 is pressed")

End If

End Sub

End Class

This detects whether "Key A" is pressed or not but how to use it to detect whether the key pressed is small "a" or Caps "A" and similarly for other alphabets and also to detect colon,semi-colon,braces etc.

plz help me guys.

Dave Kreskowiak7-Oct-13 9:22

Dave Kreskowiak

7-Oct-13 9:22

Yeah, this is never going to work. This needs to be scrapped and redone. You SERIOUSLY need to Google for "VB.NET global keyboard hook" and study what you find.

The reason this won't work is because your timer probably isn't going to fire fast enough and if you turn up the frequency this runs, you'll just end up pegging a CPU and still missing keys.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak

Eddy Vluggen7-Oct-13 5:03

7-Oct-13 5:03

srinivasankrishnaa wrote:
How to solve this.

That's how a KEYlogger works; it logs all the keys that are pressed on a keyboard.

A key is not a character. A capital A is typed by holding the A-key and the SHIFT-key. It'll depend on the loaded keyboard-layout to which characters the pressed *keys* will be translated.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

srinivasankrishnaa7-Oct-13 5:21

7-Oct-13 5:21

If So I wil ask one more question
if i press "a" or "A" in my keyboard the current application is displaying the pressed character
now if i press small "a" in my keyboard my current application has to display small "b" and it should not display small "a".when my application is minimized.
how to do this.

Eddy Vluggen7-Oct-13 7:14

7-Oct-13 7:14

Send key "a" when the user presses your key. Send keys "backspace" and "b" when the user hits that key again.

It'll work "most of the time", and you'll be mucking with focus, some stubborn apps that'll never work (because of the way they're built) and, worst of all, a delay between input and user-feedback.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

MEF Reading

Brady Kelly30-Sep-13 2:22

Brady Kelly

30-Sep-13 2:22

I'm looking for recommendations for the best reading articles, white papers, tutorials etc. on Microsoft Extensibiliy Framework. I have a complex modular application to architect, and really need to brush up on more than just compile time exports and imports.

Re: MEF Reading

Kornfeld Eliyahu Peter30-Sep-13 4:05

Kornfeld Eliyahu Peter

30-Sep-13 4:05

You may start here
http://mef.codeplex.com/documentation[^]
and here
http://msdn.microsoft.com/en-us/library/dd460648.aspx[^]

There is a sample using MEF that I wrote here
Windows Service to Host Multiple WCF Services[^]

I used MEF in other scenarios too, and found it simple (although not easy!) to use, My advice is that do not let the complexity of your own project to confuse you about MEF. Try to understand it with no connection to complexity than apply it...

Good luck
Peter

I'm not questioning your powers of observation; I'm merely remarking upon the paradox of asking a masked man who he is (V).

keyboard

srinivasankrishnaa27-Sep-13 5:07

27-Sep-13 5:07

How Does A on screen keyboard work in the current application?
my keyboard is working only in my application textbox,i have designed it in vb.net.

Abhinav S28-Sep-13 3:54

Abhinav S

28-Sep-13 3:54

An onscreen keyboard is generally supposed to work with its own application for security reasons.

Apps - Color Analyzer | Arctic | XKCD | Sound Meter | Speed Dial

srinivasankrishnaa5-Oct-13 22:50

5-Oct-13 22:50

But How can I use It to type in Other Applications.

Eddy Vluggen6-Oct-13 0:47

6-Oct-13 0:47

srinivasankrishnaa wrote:
But How can I use It to type in Other Applications

Send the keys[^] to that application.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

srinivasankrishnaa7-Oct-13 2:49

7-Oct-13 2:49

while pressing the keys it should go to the current application.
Any Code Suggestions........

Eddy Vluggen7-Oct-13 5:01