Hi I have a Windows application written in VB which has many functions. In
addition it also reads a database and generates a output file.

Currently this function is called when ever user clicks the button from UI.
But I like to call the function from command line too.
app.exe database.mdb should call the function to generate the output file.

I have modified my Main() to do this. but I wasn't able to send output to
console. I have tried many functions in the Console class, but none was
helpful.

Any ideas on how to send output (or) error info to the console window.

Thanks In Advance.

Selva,

You should be able to write to the console with a method such as
Console.Writeline.

You might need to do a Console.Readline as the last statement to the console
window, so the window remains on screen instead of disappearing. Then you can
hit Enter to close the window.

Kerry Moorman


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Kerry Moorman wrote:
You can access a Console window from a Windows Forms app?

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Kerry, I have tried doing that. But nothing gets printed to the console
window.

Selva

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Hi Selva,

Based on my understanding, your winform application wanted to read input
from command line while startup and write some output to the console
window.

Yes, the winform application will disable the console window by default, so
the Console.WriteLine method will not have any effect in winform
application. To workaround this problem, you have 2 choices:

1. The simplest way is: after creating the winform project, you may change
the project type from "Windows Application" to "Console Application"(in
Project setting dialog->General->"Output Type" dropdownlist). This will
force the runtime to display a console window follow with the GUI form, and
any Console.WriteLine method will be displayed in the window.

2. If you do not want to show the console window while startup, but want to
display it on-demand. You'd better p/invoke Win32 Console API AllocConsole
and AllocConsole to get this done.

AllocConsole API will allocate a new console for the calling process, which
Console.WriteLine will be displayed, while FreeConsole() will destroy this
console when you do not want it. Below is the working sample code snippet:

Imports System.Runtime.InteropServices
Public Class Form1
    Inherits System.Windows.Forms.Form

    Public Class Win32
        <DllImport("kernel32.dll")> _
        Public Shared Function AllocConsole() As [Boolean]
        End Function

        <DllImport("kernel32.dll")> _
        Public Shared Function FreeConsole() As [Boolean]
        End Function
    End Class 'Win32

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
        Win32.AllocConsole()
        Console.WriteLine("abc")

    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button2.Click
        Win32.FreeConsole()
    End Sub
End Class

Hope this helps.

Best regards,
Jeffrey Tan
Microsoft Online Community Support
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Thank You so much Jeff. Thats exactly I am looking for,

Thanks Again.

""Jeffrey Tan[MSFT]"" <je***@online.microsoft.com> wrote in message
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