How To Send Keystroke

Nov 20, 2008

the code that send keystroke to another app by


Send A Keystroke To A Window?

Oct 21, 2010

I'm trying to send a keystroke to a window (of an external executable) but am having problems.

If I launch the exe with a window I can successfully send it a "q" (in order to make it exit) using the follow:

1) AppActivate and SendKeys

2) SendMessage API using WM_KEYDOWN and WM_KEYUP

3) AppActivate and keybd_event or SetForegroundWindow and keybd_event

However, if I launch it without a window, obviously method 1) does not work as SendKeys only work on applications with visible windows, but I thought that method 2) would work. However, it doesn't. Also, using method 3) with SetForegroundWindow as this seems to only work with visible windows, which is not really a surprise I guess, given the name.

Another method I have tried, which won't work is using the RedirectStandardInput - I have this working correctly, but the application is looking for keyboard events, not writes to its StandardInput stream, so this doesn't have any effect.
Finally, I have tried using SendMessage and FindWindowEx, and TranslateMessage, to find any child windows or controls that should be receiving the messages, rather than the main window. However, no child windows or controls are found, and I wouldn't have thought this would be the solution given that, if the window is present, the main window receives the message as it should.

So, I have confirmed that the messages are going to the correct window, as they arrive as they should when the application is launched with a window, but I cannot get the application to receive the message when it is window-less. The solution doesn't have to involve messages, or even be particularly robust, but this is what I have tried so far (all the obvious stuff!)

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Send Keystroke With Sendinput?

Mar 29, 2010

is there something wrong with this? its not sending the key

Dim inputEvents As New USER32.INPUT = Convert.ToInt16(key) = 0 = 0 = IntPtr.Zero


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Send A Keystroke To An Application With No Window?

Oct 4, 2010

I'm trying to send a single keystroke to an application that has no window (because I have launched it with StartInfo.CreateNoWindow = True) and therefore I can't use SendKeys. I had a look at SendMessage but this doesn't seem to be quite right as the programme I'm sending it to doesn't process message queues.I would usually use the StartInfo.RedirectStandardInput property and send it via a StreamWriter but this doesn't not work as the application it is being sent to is looking for actual keyboard keystrokes, rather than pulling info from StandardInput (an old C++ programme using getch). Anyone have any ideas how to send a keystoke to an application with no window (FYI I don't need anything back from it, I don't need to wait until it's processed, and I only need to send one letter and no carriage returns or linefeeds, though these wouldn't hurt)

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VS 2008 Send Keystroke With SendInput?

Mar 28, 2010

i am trying to send keystroke using sendinput but it doesnt seem to be sending. I have sendInput declared in user32 class with the input type

dim key as Keys = Keys.A
Dim inputEvents As New USER32.INPUT = Convert.ToInt16(key)


am i setting the flags wrong to send a key? not 0 then a 2?

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Capture Down-arrow Keystroke?

Jul 8, 2009

The feature I'm trying to implement allows the user to press the down-arrow key and "tab" through different features on the form. Is there a way to use the keyPressEventArgs or something similar to catch that? Is it necessary to delve into hooks and processes? And if so, does anyone know a good resource for a beginner?

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Detect Keystroke In Datagridview?

Jan 7, 2009

I'm having problem with keystroke detection, I want to detect only "enter" and "I" keystroke.If you press "enter", it will automatically close the form the datagridview located and send data to other form, I'm using keydown function, but I don't know how to detect only "enter" and "I" keystroke, usually I'm browsing datagrid with tab button, but when I press tab, it also closed down.


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How To Stop Keystroke Event

Dec 23, 2009

I need to stop the keystroke event when I pressed a particular key. E.g.: If press alt+tab key then that keys should not perform that operation, that should operation should be stopped. I captured that particular keystroke, but I want to know how to stop that particular operation.

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Disable KeyStroke During Form Loading?

Dec 3, 2009

Problem: Form hasn't fully initialize but shortcut keys can be usedDetails: Launch an mdi child with database access retrieving data, and user is already using the shortcut keys while the data is still been retrieve which results to error since object hasn't fully initialize yet.

Goal: Hinder user from using shortcut keys by disabling the keys at initialization then enabling it after all objects are good to go.

Another Situation is:A form with a gridview and a button.I got a hotkey that when press, handles a gridview getfocus event.

The problem is that the gridview is still making its instance and when press the hotkey, it activates the getfocus property of that gridview(which is still creating its instance).

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End The Program On Any Keystroke Or Mouse Movement?

Feb 18, 2009

I've got a very simple screen saver program that displays alot of stuff in pictureboxes and labels...dynamic display. I want to end the program on any keystroke or mouse movement. I've placed the statement "me.close()" in Public Sub Form1_KeyDown routine (Form1/Events). Nothing happens when I type though. I've seached the forums.....keypreview is true....

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DataGridView: Validation On Keystroke In Column (D.G.V.TextBoxColumn)?

Jan 18, 2009

I was curious if there is an easy way, besides making a new custom DataGridViewColumn, that on each keystroke validation is done (while the D.G.V.TextBoxCell is being edited), instead of when focus is lost off the cell.Or in a different senerio, if there is a way to restrict user keystrokes while a D.G.V.TextBox Cell is being edited, while not relying on making a new custom DataGridViewColumn. I would go through the work of implementing this new Column, except the customer for the job I am working at wants small, managable code. And even if this is a useful feature, they would want to avoid having an extra class being made.

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Dec 9, 2009

I am fairly new to programming and I am completing the Step by Step by Microsoft for Visual Basic 2008, but I am not finding anything in the book about binding keystrokes for a program. I want to add the Number Pad into my Calculator Program so that every keystroke on it would correspond to a button in my program but I am unsure how to do this take.

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Sendkeys - Simple Application For Sending Keystroke?

Mar 20, 2012

I have an issue regarding Sendkeys Class, as i want to use this class in order to send some keystroke to the active application. As a first step i want to test the {Enter} keystroke, so in order to achieve that i made a simple application in 2010

Public Class Form1
Public Shared data As String
Private Sub SendintText(command As String)


By the way in order to use double quotes in a parameter you need "test"...(i have spent 15 min to find out) so it might be usefull...

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Store Keystroke From Computer Or Any App And Transfer It To Given Text?

Nov 15, 2009

I want to create application that will keylog keystroke and if specific word or key stroke is typed than it will change typed word to somestring.

Example :- (kinda like flowchart)

1. User types "something" in word, firefox, etc.. ( doesn't matter it should be able to capture value from any app ) 

2. Application captures keystroke and check if keystroke is "something"

3. If keystoke is "something" then it will transfer or take away "something"

4. Instead of something it will type or write "I just wrote something."

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Mar 23, 2009

give me the line or code on how to check the characters as you type into a textbox. What i want to do is, creating a calculator.. but on the numpad, if you strike the "*"(asterix) or plus... or what have you... then it should change the Sign to it.. and not type the actual "*" in the text box..

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May 18, 2009

let me explain in more detail so you don't get the wrong idea of what I'm trying to accomplish.If I have a button object, say Button1, on my form and I select it with my mouse, it brings up another form or dialog.  If in the text field property of Button1 I enter &Button1, the B will have an underscore under it and if I hold down the Alt key and press b, it too will invoke the other form or dialog.  I would like to also have the capability to do that with a datepicker field or textbox field.

Right now, I can set up several buttons with Alt-keystroke combos that work by default, but it seems like I have to write some form of keystroke intercept routine and test for the conditions I'm looking for and force the focus to the datepicker or textbox.  Am I missing something?  Is there a better way to do this?  Or is there actually a way of setting up a label on a textbox or datepicker object.

Kind of like when you're using MS Access and building a report, the fields have a leader that you can type a label in.  That's what I'm looking to do.  So if the label part of the datepicker field says Date: if I press and hold the Alt key and press d, it will invoke the datepicker field (aka open the calendar for selection). 

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Apr 10, 2009

what I would like to do is create a program that runs in the task bar next to the time. What I want this to do is listen for the key stroke combo of CTRL-ALT-T no matter what program they are in. When they hit this key stroke I want the program to do is hide the task bar on the bottom of the screen. you know how you can change the hight to two rows one row and so on but you can also drag it down so it has no rows and can't see it. Then when they hit CTRL-ALT-T it will then display the task bar with what ever the hight wa set to. Just don't know what direction to go to do this.

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VS 2008 SendKeys.Send() Method Does Not Send The Keys Fully Correct All The Time

Nov 9, 2009


Now as you can see it is sending the textbox1 text and then pressing enter then sending textbox2 text! Theres quite a few problems in that but before i discuss note: This code is in a Timer. Problem #1: It does not send the keys fully correct all the time because its trying to send them all at once! So i want it to send them 1 letter after the other with 200 ms sleep in them! Problem #2: The sleep is not working: The reason i know is because even after it did the first textbox1 text it didnt wait that 2000 ms!

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May 28, 2009

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Nov 7, 2010

I am using send keys to send the squence Alt W (a integer called 'index') Escape


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Send Keys To A Control On My Form - SendKeys.Send NullReferenceException

May 9, 2012

I am trying to send keys to a control on my form. But I am getting a NullReferenceException and I don't know why. The code is about as basic as it gets: [Code] The error reported is object reference not set to an instance of an object but Send is a shared method so doesn't need an instance. Strangely if I ignore the error it works fine and F4 is passed to the control. I know there was an issue with sendkeys and UAC but I thought this had been solved (I am using 4.0 framework).

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VS 2008 Send Mouse Click's & Send Key's To Minimized Window?

Apr 9, 2012

I have a filter that is used to populate a grid view and the url will conain: /example/grid?value1=1&value2=2

It will then have a link to page 2, which allows them to edit something.I then want them to click a link that will send them back to the gridview under the same parameters of: /example/grid?value1=1&value2=2

Is this possible? How do I hold on and fill in the URL values so it knows how to refill the grid view accordingly?

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Nov 7, 2009

I get an error on SMTP.Send(MyMailMessage) saying 'Failed to send'

Dim MyMailMessage As New MailMessage()
ProgressBar1.Value = 30
MyMailMessage.From = New MailAddress("MyGmailEmail")


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Use The Send Keys Function To Send Text To Another Program?

Apr 29, 2009

I am trying to use the send keys function to send text to another program.I ahve gotten it al working well, except for using () as I know sendkeys doesnt like these.I have tried using the Replace function in several places in my code to replace the ( with {(} and {+0} etc, with various other options tried.But when I run the program, it seems to skip this out completly and leaves them in the string as (, and therefore it errors and wont run.When I step through it, it goes through the function but doesnt alter the strng as it should. This is the code to send the string and my attempt at making it replace the () in the module

Module TextReplacement
Private Declare Function GetAsyncKeyState Lib "user32.dll" (ByVal vKey As Int32) As Short
Dim counter As Integer
Dim sData() As String


The error I get when i try send "Test :)" is: ArgumentExcveption was unhandled "SendKeys string 'Test :)' is not valid"

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Aug 27, 2011

I'm making an auto-typer and I need it to only send one line of a multi-lined textbox at a time. It looks like this right now;

If Label1.Text = "1" Then
Timer2.Enabled = False
End If

I want the Textbox2.text to be entered one line at a time and then to sleep for the desired time.

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Jul 4, 2010

How can I have a time out between every key I send ?


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