Problem with ReadToEnd and output freeze

[nikel]

Hello, I'm trying to embed command prompt to my app. The output textbox is freezing when I run the program. Actually it isn't freezing, it's waiting exe to finish its work. I want to get lines immediately as it does in command prompt.

Private Sub CMDAutomate()
 
    Dim cmdProcess As New Process
    Dim StartInfo As New System.Diagnostics.ProcessStartInfo
    StartInfo.FileName = "anexecutable" 'starts cmd window
    StartInfo.Arguments = "somearguments"
    StartInfo.RedirectStandardInput = True
    StartInfo.RedirectStandardOutput = True
    StartInfo.UseShellExecute = False 'required to redirect
    StartInfo.CreateNoWindow = True 'creates no cmd window
    cmdProcess.StartInfo = StartInfo
    cmdProcess.Start()
 
    Dim SR As System.IO.StreamReader = cmdProcess.StandardOutput
    Dim SW As System.IO.StreamWriter = cmdProcess.StandardInput
    SW.WriteLine(OutputTextBox.Text) 'the command you wish to run.....
    SW.WriteLine("exit") 'exits command prompt window
    Results = SR.ReadToEnd 'returns results of the command window
    SW.Close()
    SR.Close()
    'invokes Finished delegate, which updates textbox with the results text
    Invoke(Finished)
 
End Sub

By the way, (I don't know where to ask) how can I wrap my codes in this site with vb.net style?

[jmcilhinney]

ReadToEnd won't return until there's an end to read to. If you want to read the output in blocks then call some other method, e.g. ReadLine or Read.

By the way, (I don't know where to ask) how can I wrap my codes in this site with vb.net style?

When you post code snippets inside highlight tags, you get to specify an option for formatting the highlighting. Not surprisingly, if you want VB.NET syntax highlighting then the option should be "vb.net", i.e.

[HIGHLIGHT=vb.net]your code here[/HIGHLIGHT]

[nikel]

Hello, thank you for your reply. This works fine:

Results = Results & SR.ReadLine & ControlChars.NewLine
Results = Results & SR.ReadLine & ControlChars.NewLine

But how can I learn how many lines in that result?

EDIT: I noticed that using readline does the same thing. I also tried ReadLineAsync.

[Joacim Andersson]

Instead of doing it that way call Process.BeginOutputReadLine and then create an event handler for the OutputDataReceived event.