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Mar 2nd, 2007

Couple of questions

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I am using Visual Basic 2005 express (.net)

1) How would one get a SINGLE keypress in the console? (the equivilant to INKEY$ in QBASIC)

2) crap, i forgot my other question! Oh well. Chances are i will remember in a few minutes :lol:

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Marks256

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Mar 2nd, 2007

Re: Couple of questions

A single key press?

What are you trying to do. I bet you can use a String for this instead.

And the console.readline()

Last edited by iamthwee; Mar 2nd, 2007 at 3:02 pm.

iamthwee

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Mar 3rd, 2007

Re: Couple of questions

I just want to catch a single key press, and make it do something. I want it so when a key is pressed, nothing is displayed on the screen (as console.readline() does...)

I just want a silent (non noticable) action to take place when a key is pressed. Something like this;

Quote ...

Please press 'k' to do this
Please press "x" to exit the program

I just want to press the key, and not have to worry about pressing return.

Marks256

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Mar 3rd, 2007

Re: Couple of questions

Bummer. I just read a few posts on other forums, and they all said that it can not be done.

Is there a way i could catch the key press from a WinAPI message?

Marks256

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Mar 3rd, 2007

Re: Couple of questions

Click to Expand / Collapse Quote originally posted by Marks256 ...

Bummer. I just read a few posts on other forums, and they all said that it can not be done.

Is there a way i could catch the key press from a WinAPI message?

well why dont you try the keyPress event.. and is it a windows application or a console application.. if you are using windows then try using the forms-> keypress event :-|

arjunsasidharan

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Mar 3rd, 2007

Re: Couple of questions

arjunsasidharan is right.
On your form properties set the KeyPreview to true. Then use code simular to this:

VB.NET Syntax (Toggle Plain Text)
    Private Sub Form1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Me.KeyPress
        Select Case e.KeyChar
            Case "k", "K"
                MessageBox.Show("k was pressed")
            Case "x", "X"
                Me.Close()
        End Select
    End Sub
    Private Sub Form1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Me.KeyPress
        Select Case e.KeyChar
            Case "k", "K"
                MessageBox.Show("k was pressed")
            Case "x", "X"
                Me.Close()
        End Select
    End Sub

Last edited by waynespangler; Mar 3rd, 2007 at 9:45 am.

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Mar 3rd, 2007

Re: Couple of questions

It is a console app. I know how to do it in a windows app (gui), but not in the console.

Marks256

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Mar 3rd, 2007

Re: Couple of questions

Then try this:

VB.NET Syntax (Toggle Plain Text)
Module Module1
    Private theKey As ConsoleKeyInfo = New ConsoleKeyInfo
 
    Sub Main()
        Do
            theKey = Console.ReadKey(True)
            Select Case theKey.Key
                Case ConsoleKey.X
                    Exit Do
                Case ConsoleKey.N
                    PrintScreen()
            End Select
        Loop
    End Sub
 
    Private Sub PrintScreen()
        Console.Write("000,000.00", 1234.5F)
        Console.WriteLine()
    End Sub
 
End Module
Module Module1
    Private theKey As ConsoleKeyInfo = New ConsoleKeyInfo

    Sub Main()
        Do
            theKey = Console.ReadKey(True)
            Select Case theKey.Key
                Case ConsoleKey.X
                    Exit Do
                Case ConsoleKey.N
                    PrintScreen()
            End Select
        Loop
    End Sub

    Private Sub PrintScreen()
        Console.Write("000,000.00", 1234.5F)
        Console.WriteLine()
    End Sub

End Module

Hope this is what you want.

Last edited by waynespangler; Mar 3rd, 2007 at 10:43 pm.

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Mar 4th, 2007

Re: Couple of questions

Thank you!

Now could i have you explain how it works?

I understand how most of it works, just not these two parts;

VB.NET Syntax (Toggle Plain Text)
Private theKey As ConsoleKeyInfo = New ConsoleKeyInfo
.....
.....
.....
            theKey = Console.ReadKey(True)
Private theKey As ConsoleKeyInfo = New ConsoleKeyInfo
.....
.....
.....
            theKey = Console.ReadKey(True)

Marks256

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Mar 4th, 2007

Re: Couple of questions

Ok, i figured out what the "theKey = Console.ReadKey(true)" does (that is why my code didn't work. I didn't use the "(true)".

Anyways, i still can't quite figure out what the purpose of the

VB.NET Syntax (Toggle Plain Text)
Private theKey As ConsoleKeyInfo = New ConsoleKeyInfo
Private theKey As ConsoleKeyInfo = New ConsoleKeyInfo

is for

I know that it defines what theKey is, but why is it needed? (poor statement, yes, but i really don't see the need for it...)

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