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You posted this same question below, and received some suggestions. However, the SendInput function merely adds the keystroke messages to the keyboard input stream. It does not guarantee which application will read them. You may also try the SendKeys Method[^], but that again will only send them to the active window. Perhaps it would be better if you explained in clear detail what issue you are trying to solve.
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This question has the same title but it is not the same question. Below I was trying to find out which function to use to communicate with a dos program (Send Key Strokes).
Now I am trying to find out how to set focus to a dos program. I am not sure "set focus" is even the right word(s).
You are absolutely right! I edited the post to explain it better. I am 68 a geek so I don't explaine things clear enough. Please let me know if any more information is needed. As far as what I am trying to do. I use a DOS cnc program that uses two simultaneously key presses to control movement. Example Ctrl + S
There are a few dozen of these. I want to create a application with each button labeled that sends the proper hotkey combination. I am a amateur but good enough that if I can send keys to the DOS CNC application I can write the rest easily.
Thank You!
Ron Derkis
modified 30-Dec-15 10:10am.
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rderkis wrote: I am not sure "set focus" is even the right word(s).
It is; there's only one application that has input-focus. SendKeys and SendInput will send information to the current active window, which may be different from your intention. Not only is input-focus limited to a single application, it is limited to a single control; press tab and you see the input change focus. Press alt-tab and you see applications change focus.
If I had to automate a console-application, I'd look into redirecting stdin and stdout instead of sending individual keystrokes.
rderkis wrote: I am 68 a geek so I don't explaine things clear enough
You're among geeks here and you can always post a new message explaining stuff in detail.
I only know that you want to send input to a console-application, and writing to the input-stream would do that. It would still be a good excercise to write that device-driver though 
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
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I bought the control pendant ($800) for the cnc mill so I don't need to write the program anymore.
I sent email to the programmer that wrote the onscreen keyboard program, asking him what function he used to communicate with the current DOS program. He said Sendinput. I should have asked him how he found and set the focus to the Dos program and control. Upon thinking about it, I should have gotten that information, somehow from windows, as the current screen control that has control before my program took control.
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I can send keystrokes to a DOS command prompt screen but unable to send keystrokes to a DOS application like DOS Edit..
I have downloaded and ran a few virtual onscreen keyboards, a few of these can write to DOS Edit, other can't.
Can someone please point me in the right direction. I have tried sendkeys, clipboard copy paste, p-invoke etc.
Quite a few people say it can't be done but since some of the onscreen keyboards do it, it can be done.
Thank You
Ron Derkis
win 7
vb.net 2010
modified 26-Dec-15 16:48pm.
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Well Mr.Kreskowiak I setup the code module shown in your link. It shocked me because it compiled perfect with nothing to fix. And it is super easy to use.
First I tried it with note pad to make sure Everything was setup right. Worked perfect. Then I tried it with DOS Edit. It would not work with the sendinput function.  nor would it work with my DOS CNC program.
I really, really appreciate your taking the time to help me! Any more ideas?
Ron Derkis
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rderkis wrote: Quite a few people say it can't be done but since some of the onscreen keyboards
do it, it can be done.
That it can be done does not mean that there is a solution publicly available. I'd imagine the best onscreen keyboard would be an actual device driver that acts as an input-device.
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
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Ok, I sent a email to one of the free onscreen code authors (that work with a DOS application).
He said they use sendinput.
I think I understand my problem now. I am sending the input to the cmd window and not the dos application itself. I will ask in another message how to do that. Thank all of you that took your valuable time to try to help me!
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There is no target information in SendInput. Nothing that says "send the input to this window". So, are you sure the DOS window you launched has the focus when you call SendInput?
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I reposted the message stating what I have done. And that I normalize the window and then set focus to it. The proper DOS screen comes up but I think your right some how I am not sending keys to the DOS application. Please check out my new post.
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Hi everyone! I am trying to send keys from a vb.net program to a cnc control dos program.
I know it can be done because the onscreen keyboards will send keys to it.
I have searched and tried everything I could find.
At present I can set the focus to the application.
Tried pasting clipboard to it.
etc.
I have been told over and over it cant be done but like I stated the onscreen keyboards work with it.
Windows 7
VB 2010
Thank You!
Ron Derkis
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Which on-screen keyboards? The built-in Windows on-screen keyboard?
The difficult we do right away...
...the impossible takes slightly longer.
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Yes, the easy access on screen keyboard. If you like I can try others but I think they will all work with the dos program to.
Thank you for taking the time to consider my question Mr. Andrew
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I tried sending sendkeys to the dos process I set focus to. The focus worked and brought the dos program to the forefront but no luck on the senkeys. I substituted the dos program name with notepad and it worked fine. Upon researching the problem most people were of the option sendkeys would not work with dos programs.
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I just tried an experimental program where I sent keystrokes to an open command window, and it worked.
Are you able to send keystrokes to any other command prompt windows (i.e. running a different DOS program?)
The difficult we do right away...
...the impossible takes slightly longer.
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Yes just tried to send to command prompt, worked great. Why cant I send it to the dos program.
This is the vary basic code I am testing with (Proof of concept)
Private Sub BtnSetFocus_Click(sender As System.Object, e As System.EventArgs) Handles BtnSetFocus.Click
Dim App As Process() = Process.GetProcessesByName(DosTitle.Text)
Label1.Text = "Program Not Found"
If App.Length > 0 Then
Label1.Text = "Program Found"
AppActivate(App(0).Id)
Thread.Sleep(1000)
SendKeys.Send("7 " + vbCr)
End If
End Sub
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I notice that you're sending a carriage return after the character.
According to this page, [^] you should send "{ENTER}" if you wish to have the effect of pressing the ENTER key.
The difficult we do right away...
...the impossible takes slightly longer.
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I tried it using
Sendkey"7" + "{chr(13)}"
I tried it using
Sendkey"7"
I tried it using
Sendkey"7" + "{ENTER}"
I tried it using
Sendkey"7"
Sendkey"{ENTER}"
if anything I am persistent 
Thank you for your time Mr Andrew
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This is a different function to test SSL connectivity to a Web Service.
I keep getting timout on using Stream_writer. I'm thinking that I can't ask for a request until I send data to the website, or it just can't be done using streamwriter. I'm not sure, I don't do much stuff like this, but it works fine on port 80.
And the URL is like https://domain.com/webservice.asmx"
Dim request_str As String = "/ HTTP/1.1" & vbLf & "Host: " & pHost & "?wsdl"
Dim response_str As String = Nothing
Dim encoder As ASCIIEncoding = New ASCIIEncoding
Dim bytes() As Byte = encoder.GetBytes(request_str)
Dim request As HttpWebRequest = HttpWebRequest.Create(pUrl & "?wsdl")
request.Credentials = CredentialCache.DefaultCredentials
request.Method = "POST"
request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8"
request.ContentType = "application/x-www-form-urlencoded"
request.KeepAlive = False
request.UserAgent = "SMTP Messenger 2015/" & My.Application.Info.Version.ToString
request.Referer = ""
request.ContentLength = bytes.Length
request.Timeout = 15
Try
ServicePointManager.ServerCertificateValidationCallback = New System.Net.Security.RemoteCertificateValidationCallback(AddressOf AcceptAllCertifications)
Using stream_writer As StreamWriter = New StreamWriter(request.GetRequestStream)
stream_writer.Write(request_str)
End Using
Using response As HttpWebResponse = request.GetResponse()
Using stream_response As StreamReader = New StreamReader(response.GetResponseStream())
response_str = stream_response.ReadToEnd()
stream_response.Close()
If (response_str IsNot Nothing) Then
If response_str.Contains("<?xml version") Then
global_variables.gOnline = True
pValue = True
End If
End If
End Using
End Using
Catch ex As WebException
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I finally realized that I just needed to send a GET request, but kept getting that error, Verb GET cannot perform this function. hmm?
Finally I realized that I don't need to to use streamwriter to send anything, and that I just needed to use HttpWeResponse to send HttpWebRequest and read the result.
I don't have a lot of experience with using HttpWebRequest and Response, but I'm getting better at now. As as side note, I didn't know that you can attach the ServerCertificateCallback to HttpWebRequest.
So I had many issues here.
How to handle SSL,
and how to write a GET request.
Many threads on other sites simply said just change get to post.
Perhaps I should of just searched for how to request a web page.
Dim request_str As String = "/ HTTP/1.1" & vbLf & "Host: " & pHost
Dim response_str As String = Nothing
Dim request As HttpWebRequest = HttpWebRequest.Create(pUrl)
request.Credentials = CredentialCache.DefaultCredentials
request.ClientCertificates.Add(New X509Certificate)
request.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8"
request.CookieContainer = New CookieContainer()
request.ContentType = "application/x-www-form-urlencoded"
request.KeepAlive = True
request.Method = "GET"
request.Timeout = 10000
request.UserAgent = My.Application.Info.Title & "/" & My.Application.Info.Version.ToString
request.ServerCertificateValidationCallback = New _ System.Net.Security.RemoteCertificateValidationCallback(AddressOf AcceptAllCertifications)
Try
Using response As HttpWebResponse = request.GetResponse()
Using stream_response As StreamReader = New StreamReader(response.GetResponseStream())
response_str = stream_response.ReadToEnd()
stream_response.Close()
If (response_str IsNot Nothing) Then
If response_str.ToLower.Contains("<html") Then
global_variables.gOnline = True
pValue = True
End If
End If
End Using
End Using
Catch ex As WebException
global_variables.gOnline = True
pValue = True
End Try
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I have a test program that will test the connection to an email server that I wrote using a socket, in which I send text command like EHLO.
It's just a fun program to play around with. But I'd like to play around with StartTLS for socket connections on port 587.
Can't find much on the subject. I can issue a StartTLS to the mail server but I'm not sure what to do next. Do I need to generate a certificate, or send my key to the mail server, stuff like that.
I found tech support for compiled programs, and that was about it. Any help would be appreciated!
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Hello !
I have an application on vb.net 2013.
Is there any way , or some library that I can use to read from Barcode Readers (USB) ?
Thank you !
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