I'm trying to run a cmd like application (so no GUI) in my form. In the example down below I called it ExternalApp.exe. The code itself works; I can send commands to it by entering them in TextBox2. The issue is that ExternalApp normally uses a command prompt and supports things like displaying one single screen of output and then wait for an enter before showing the next one. This is no longer working, all output is sent to TextBox1 all at once.
Is there any way to have ExternalApp behave like it normally does? I hope I'm explained myself a bit clear. Thanks for any help in advance!
Kind regards,
Eric
Public Class Form1
Dim WithEvents P As New Process
Dim SW As System.IO.StreamWriter
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
P.EnableRaisingEvents = True
Me.Text = "My title"
AddHandler P.OutputDataReceived, AddressOf DisplayOutput
P.StartInfo.CreateNoWindow() = True
P.StartInfo.UseShellExecute = False
P.StartInfo.RedirectStandardInput = True
P.StartInfo.RedirectStandardOutput = True
P.StartInfo.FileName = "ExternalApp.exe"
P.StartInfo.Arguments = ""
P.Start()
P.SynchronizingObject = Me
P.BeginOutputReadLine()
SW = P.StandardInput
SW.WriteLine()
End Sub
Private Sub DisplayOutput(ByVal sendingProcess As Object, ByVal output As DataReceivedEventArgs)
TextBox1.AppendText(output.Data() & vbCrLf)
End Sub
Private Sub Textbox2_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox2.KeyPress
If e.KeyChar = Chr(Keys.Return) Then
SW.WriteLine(TextBox2.Text)
End If
End Sub
Private Sub myProcess_Exited(ByVal sender As Object, ByVal e As System.EventArgs) Handles P.Exited
Me.Close()
End Sub End Class
Related
I would like to run cmd.exe in one single textbox. When I use the code down below, everything works fine. The only thing is that the cursor is located below the prompt line, so:
C:\Users\myuser\source\repos\WindowsApp7\WindowsApp7\bin\Debug>
The cursor is here
and I would like my cursor to be next to the prompt, like:
C:\Users\mysuser\source\repos\WindowsApp7\WindowsApp7\bin\Debug>The
cursor should be here
Any ideas how I should do that?
Thanks for any help in advance!
Kind regards,
Eric
Public Class Form1
Dim P As New Process
Dim SW As System.IO.StreamWriter
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
AddHandler P.OutputDataReceived, AddressOf DisplayOutput
P.StartInfo.CreateNoWindow() = True
P.StartInfo.UseShellExecute = False
P.StartInfo.RedirectStandardInput = True
P.StartInfo.RedirectStandardOutput = True
P.StartInfo.FileName = "cmd.exe"
P.Start()
P.SynchronizingObject = TextBox1
P.BeginOutputReadLine()
SW = P.StandardInput
SW.WriteLine()
End Sub
Private Sub DisplayOutput(ByVal sendingProcess As Object, ByVal output As DataReceivedEventArgs)
TextBox1.AppendText(output.Data() & vbCrLf)
End Sub
Private Sub Textbox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
Static Line As String
If e.KeyChar = Chr(Keys.Return) Then
SW.WriteLine(Line & vbCrLf)
Line = ""
Else
Line = Line & e.KeyChar
End If
End Sub
End Class
I have found some code which runs a cmd.exe shell interactively in a TextBox; later on I will replace cmd.exe with a different character based application.
Here's the code:
Public Class Form1
Dim P As New Process
Dim SW As System.IO.StreamWriter
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.Text = "My title"
AddHandler P.OutputDataReceived, AddressOf DisplayOutput
P.StartInfo.CreateNoWindow() = True
P.StartInfo.UseShellExecute = False
P.StartInfo.RedirectStandardInput = True
P.StartInfo.RedirectStandardOutput = True
P.StartInfo.FileName = "cmd"
P.Start()
P.SynchronizingObject = TextBox1
P.BeginOutputReadLine()
SW = P.StandardInput
SW.WriteLine()
End Sub
Private Sub DisplayOutput(ByVal sendingProcess As Object, ByVal output As DataReceivedEventArgs)
TextBox1.AppendText(output.Data() & vbCrLf)
End Sub
Private Sub Textbox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
Static Line As String
If e.KeyChar = Chr(Keys.Return) Then
SW.WriteLine(Line & vbCrLf)
Line = ""
Else
Line = Line & e.KeyChar
End If
End Sub
End Class
When you enter the exit command, the cmd.exe process terminates.
I like my application to unload Form1 when this occurs, but I don't know how to implement this.
As suggested by Jimi, I added the following line to he Form1_Load sub:
P.EnableRaisingEvents = True
and added:
Private Sub myProcess_Exited(ByVal sender As Object, ByVal e As System.EventArgs) Handles P.Exited
Me.Close()
End Sub
This is working; thank you very much Jimi!
Add this above End Sub in your Form1_Load Sub:
p.WaitForExit()
Form1.Close()
Since it looks like you're calling it from Form1 itself, you could also use Me.Close.
If Form1 is the only form and you want the whole application to close, you can use Application.Exit() instead.
Some references:
http://www.vb-helper.com/howto_net_start_notepad_wait.html
https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.form.close?view=windowsdesktop-6.0
I am using the following code to get the size of files inside a directory
and put it in Label1:
For Each foundFile As String In My.Computer.FileSystem.GetFiles( _
"\windows",Microsoft.VisualBasic.FileIO.SearchOption.SearchTopLevelOnly,_
"*.*")
Dim filesizelabel As System.IO.FileInfo = My.Computer.FileSystem.GetFileInfo(foundFile)
Label1.Text = Label1.Text + filesizelabel.Length
Next
The problem is that i have more than 50 for each loops (a system cleaning app).
When I run the loops my app freezes until the loops finish, even if I run one loop.
Is there a solution to make it show the name of the current file? I tried this as well, but it also froze my application:
label2.text = foundfile
The application does not respond to any click, until it finishes the loops. It shows the size in Label1 and the last scanned file in Label2. This also freezes the application:
system.threading.thread.sleep(100)
Is there any alternative to foreach or a solution to fix this issue?
Here's a quick example using Async/Await with a Button Click() Handler:
Private Async Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Button1.Enabled = False
Await Task.Run(Sub()
' this runs in a different thread without blocking the GUI:
For Each foundFile As String In My.Computer.FileSystem.GetFiles(
"\windows", Microsoft.VisualBasic.FileIO.SearchOption.SearchTopLevelOnly, "*.*")
Dim filesizelabel As System.IO.FileInfo = My.Computer.FileSystem.GetFileInfo(foundFile)
' when you need to update the GUI:
Me.Invoke(Sub()
' ... do it in here ...
Label1.Text = Label1.Text + filesizelabel.Length
End Sub)
Next
End Sub)
Button1.Enabled = True
End Sub
For VB.Net 2010, try this instead:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Button1.Enabled = False
Dim T As New System.Threading.Thread(AddressOf Worker)
T.Start()
End Sub
Private Sub Worker()
' this runs in a different thread without blocking the GUI:
For Each foundFile As String In My.Computer.FileSystem.GetFiles(
"\windows", Microsoft.VisualBasic.FileIO.SearchOption.SearchTopLevelOnly, "*.*")
Dim filesizelabel As System.IO.FileInfo = My.Computer.FileSystem.GetFileInfo(foundFile)
' when you need to update the GUI:
Me.Invoke(Sub()
' ... do it in here ...
Label1.Text = Label1.Text + filesizelabel.Length
End Sub)
Next
Me.Invoke(Sub()
Button1.Enabled = True
End Sub)
End Sub
This is a prime candidate for a background worker.
Have a read about how they work, but at a high level the task is run in another thread with some events that you access in your main UI thread.
Private bw As BackgroundWorker = New BackgroundWorker
Private Sub buttonStart_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
If Not bw.IsBusy = True Then
' this will start the work
bw.RunWorkerAsync()
End If
End Sub
Private Sub buttonCancel_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
If bw.WorkerSupportsCancellation = True Then
' this will allow the user to cancel the work part way through
bw.CancelAsync()
End If
End Sub
Private Sub bw_DoWork(ByVal sender As Object, ByVal e As DoWorkEventArgs)
' your slow code goes here
End Sub
Private Sub bw_ProgressChanged(ByVal sender As Object, ByVal e As ProgressChangedEventArgs)
' you can update the UI here to show progress
End Sub
Private Sub bw_RunWorkerCompleted(ByVal sender As Object, ByVal e As RunWorkerCompletedEventArgs)
' your 'I've finished notification' code goes here
End Sub
Derek has put a bad code, it's not working and Idle mind code does not work on .NET 2.0
Dereks approach is working if code is complete, as below:
Private bw As BackgroundWorker = New BackgroundWorker
Private Sub app_Load(sender As Object, e As EventArgs) Handles MyBase.Load
AddHandler bw.DoWork, AddressOf bw_DoWork
AddHandler bw.ProgressChanged, AddressOf bw_ProgressChanged
AddHandler bw.RunWorkerCompleted, AddressOf bw_RunWorkerCompleted
..
End sub
Private Sub Btn_Click(sender As Object, e As EventArgs) Handles Btn.Click
If Not bw.IsBusy = True Then
' this will start the work
bw.RunWorkerAsync()
End If
End Sub
Private Sub bw_DoWork(ByVal sender As Object, ByVal e As DoWorkEventArgs)
'your work to not freeze form
end sub
Private Sub bw_ProgressChanged(ByVal sender As Object, ByVal e As ProgressChangedEventArgs)
' you can update the UI here to show progress
End Sub
Private Sub bw_RunWorkerCompleted(ByVal sender As Object, ByVal e As RunWorkerCompletedEventArgs)
' your 'I've finished notification' code goes here
End Sub
Hie there.
I am trying to use RFID tags on different forms. The code I have works fine if in one from. As soon you add it to another form it stops. I have tried using event handlers to no success. Does anyone know how I coud do this.
Here is my code:
Public Class Form1
Dim WithEvents phidgetRFID As Phidgets.RFID
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'To reduce code complexity we assume that there is one PhidgetRFID
'attached to the PC before the program is run.
phidgetRFID = New Phidgets.RFID()
phidgetRFID.Open()
'Defaults for text fields
txtStatus.Text = "Not Connected"
End Sub
Public Sub New()
' This call is required by the Windows Form Designer.
InitializeComponent()
' Add any initialization after the InitializeComponent() call.
lvPhidgetInfo.MultiColumn = False
lvPhidgetInfo.Items.Insert(0, "TagID Count")
End Sub
Private Sub phidgetRFID_Attach(ByVal sender As Object, ByVal e As Phidgets.Events.AttachEventArgs) Handles phidgetRFID.Attach
'When the Phidget RFID attaches update the form text boxes
Label1.Text = "Phidget RFID Reader has Attached"
txtStatus.Text = "Connected"
txtNumOutputs.Text = phidgetRFID.outputs.Count
txtSerialNumber.Text = (Str(phidgetRFID.SerialNumber))
phidgetRFID.Antenna = True
CheckBox3.Checked = True
phidgetRFID.LED = True
CheckBox2.Checked = True
End Sub
Private Sub phidgetRFID_Detach(ByVal sender As Object, ByVal e As Phidgets.Events.DetachEventArgs) Handles phidgetRFID.Detach
'If the Phidget RFID detaches close the form
Me.Close()
End Sub
Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
'If the form closes and the Phidget RFID is attached Close it.
If phidgetRFID.Attached = True Then
phidgetRFID.close()
End If
End Sub
Private Sub phidgetRFID_Error(ByVal sender As Object, ByVal e As Phidgets.Events.ErrorEventArgs) Handles phidgetRFID.Error
'If the Phidget RFID is not attached when the form opens show
'message box and close the form
MessageBox.Show(e.Description)
Me.Close()
End Sub
Private Sub phidgetRFID_RFIDTag(ByVal sender As Object, ByVal e As Phidgets.Events.TagEventArgs) Handles phidgetRFID.Tag
Static count As Integer
count = count + 1
lvPhidgetInfo.BeginUpdate()
lvPhidgetInfo.Items.Insert(1, e.Tag & " " & count)
lvPhidgetInfo.EndUpdate()
End Sub
Private Sub phidgetRFID_RFIDTagLost(ByVal sender As Object, ByVal e As Phidgets.Events.TagEventArgs) Handles phidgetRFID.TagLost
lvPhidgetInfo.BeginUpdate()
lvPhidgetInfo.Items.Insert(1, e.Tag & " Lost")
lvPhidgetInfo.EndUpdate()
End Sub
I have also tried this and I crushes without reporting an error.
Dim PhidgetRFID As New Phidgets.RFID()
AddHandler PhidgetRFID.Attach, AddressOf rfid_Attach
AddHandler PhidgetRFID.Detach, AddressOf rfid_Detach
AddHandler PhidgetRFID.Tag, AddressOf rfid_Tag
AddHandler PhidgetRFID.TagLost, AddressOf rfid_TagLost
AddHandler PhidgetRFID.Error, AddressOf rfid_Error
PhidgetRFID.open()
PhidgetRFID.waitForAttachment(3000)
Private Sub rfid_Attach(sender As Object, e As AttachEventArgs)
Label3.Text = "RFID reader {0} attached!" & e.Device.SerialNumber.ToString()
'Throw New NotImplementedException
End Sub
Private Sub rfid_Detach(sender As Object, e As DetachEventArgs)
Label4.Text = "RFID reader {0} ditached!" & e.Device.SerialNumber.ToString()
End Sub
Private Sub rfid_Tag(sender As Object, e As TagEventArgs)
Try
txtCardNumber.Text = e.Tag
Dim lastRFIDTag As String = txtCardNumber.Text
phidgetRFID.LED = True
' Throw New NotImplementedException
Catch ex As Exception
MsgBox("" & ex.Message, , "")
End Try
End Sub
Private Sub rfid_TagLost(sender As Object, e As TagEventArgs)
'Throw New NotImplementedException
phidgetRFID.LED = False
End Sub
Plaese help..
really need help! I would like to know how to get jar output into a textbox in VB 2008.
Also i would like to send commands to it (like CMD would when you use this command:
C:\Windows\System32\java.exe -Xms128M -Xmx1024M -jar Craftbukkit.jar)
Below a proof of concept. You'll have to tweak it to your own desires and wishes. What does this do:
Start a process in the background
Start reading the output and error streams.
You can send commands via a textbox (and a click on a button).
Write the output/errors in an output textbox.
Again, this code is just a proof of concept, it is far from finished (but it demonstrates enough). You'll have to add some extra checks etc to make it "waterproof".
Public Class MyForm
Private WithEvents _CmdProcess As Process
Private Delegate Sub DisplayTextDelegate(text As String)
Private Sub MyForm_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
Dim processInfo As New ProcessStartInfo()
processInfo.FileName = "cmd"
processInfo.RedirectStandardError = True
processInfo.RedirectStandardInput = True
processInfo.RedirectStandardOutput = True
processInfo.UseShellExecute = False
processInfo.CreateNoWindow = True
_CmdProcess = Process.Start(processInfo)
_CmdProcess.BeginOutputReadLine()
_CmdProcess.BeginErrorReadLine()
End Sub
Private Sub MyForm_Disposed(sender As System.Object, e As System.EventArgs) Handles MyBase.Disposed
If _CmdProcess IsNot Nothing Then
_CmdProcess.Close()
End If
_CmdProcess = Nothing
End Sub
Private Sub btnExecute_Click(sender As System.Object, e As System.EventArgs) Handles btnExecute.Click
If Not String.IsNullOrWhiteSpace(txtCommand.Text) Then
Dim inputStream As System.IO.StreamWriter = _CmdProcess.StandardInput
inputStream.WriteLine(txtCommand.Text)
inputStream.Flush()
End If
End Sub
Private Sub CmdProcess_ErrorDataReceived(sender As System.Object, e As System.Diagnostics.DataReceivedEventArgs) Handles _CmdProcess.ErrorDataReceived
Invoke(New DisplayTextDelegate(AddressOf DisplayText), Environment.NewLine)
Invoke(New DisplayTextDelegate(AddressOf DisplayText), "Error!")
Invoke(New DisplayTextDelegate(AddressOf DisplayText), e.Data)
End Sub
Private Sub CmdProcess_OutputDataReceived(sender As System.Object, e As System.Diagnostics.DataReceivedEventArgs) Handles _CmdProcess.OutputDataReceived
Invoke(New DisplayTextDelegate(AddressOf DisplayText), e.Data)
End Sub
Private Sub DisplayText(text As String)
txtOutput.AppendText(Environment.NewLine)
txtOutput.AppendText(text)
End Sub
End Class