[Mono-list] Console.ReadKey() => no spezial chars on Linux
Paebbels
Paebbels at gmail.com
Mon Feb 16 16:33:25 EST 2009
Hi,
I programmed a console application in VB .NET with VS08 which uses
cmd-InputBuffer to display an history of old commands in my application.
After porting this application to Mono (Debian, v1.9.1) my application has
no history feature (my shell is bash).
Then I decided to uses Console.ReadKey() instead of ReadLine().
I usesd the Microsoft MSDN example to display the KeyChars, KeyCodes and
Modifiers
--------------------
[...]
Console.TreatControlCAsInput = True
Console.WriteLine(m1)
Do
Console.WriteLine(m2)
sb.Length = 0
cki = Console.ReadKey(True)
sb.Append(m3)
If cki.Modifiers <> 0 Then
If (cki.Modifiers And ConsoleModifiers.Alt) <> 0 Then
sb.Append("ALT+")
End If
If (cki.Modifiers And ConsoleModifiers.Shift) <> 0 Then
sb.Append("SHIFT+")
End If
If (cki.Modifiers And ConsoleModifiers.Control) <> 0
Then
sb.Append("CTL+")
End If
End If
sb.Append(cki.Key.ToString())
sb.AppendFormat(m4, cki.KeyChar,
Convert.ToInt32(cki.KeyChar))
sb.AppendLine().AppendLine()
Console.WriteLine(sb.ToString())
Loop While cki.Key <> ConsoleKey.Escape
--------------------
My ConsoleExtended Class has a mask with all allowed keys assoziated with an
delegate e.g. AddCharToBuffer for normal alphanumeric-chars.
Compiled on Windows this application does what it should do ^^
After porting it to Mono some ConsoleKeyInfo-Instances have an abnormal
value ...
<Enter> returns ConsoleKey.Enter which has ASCII Char 13 on Windows, on Mono
it has 10 (I know the differnet behavior of \n und \r\n ....)
Home returns on Windows ConsoleKey.Home, on Mono ConsoleKey.Esc with ASCII
Char 27 (also: End, Delete, ....)
Backspace returns on Windows ConsoleKey.Backspace ASCII Char 8, on Mono
ConsoleKey.Backspace with ASCII Char 0
After some experiments I noticed that Console.In has differnet Encodings.
Then I changed encoding to UTF-8, but nothing happend.
Why is there a differnet behavior?
What ConsoleKeyInfo-Values are used in Mono?
How to use spezial Keys like Home, End, Delete, Backspace, ...
Here are some code fragments:
--------------------------
Public Sub New()
With OutputBufferSize
.Width = Console.BufferWidth
.Height = Console.BufferHeight
End With
Dim DefaultMask As New Dictionary(Of ConsoleKeyInfo,
InputAction)
KeyMasks.Add(DefaultMaskName, DefaultMask)
CurrentKeyMask = DefaultMask
AddKeyToMask("rtn", DefaultMaskName, Function() False)
AddKeyToMask("esc", DefaultMaskName, AddressOf ClearInputBuffer)
AddKeyToMask("del", DefaultMaskName, AddressOf
DeleteAtInputBufferPos)
AddKeyToMask("bsp", DefaultMaskName, AddressOf
DeleteBeforeInputBufferPos)
AddKeyToMask("home", DefaultMaskName, AddressOf
InputBufferPosHome)
AddKeyToMask("end", DefaultMaskName, AddressOf
InputBufferPosEnd)
AddKeyToMask("left", DefaultMaskName, AddressOf
InputBufferPosLeft)
AddKeyToMask("right", DefaultMaskName, AddressOf
InputBufferPosRight)
AddKeyToMask("up", DefaultMaskName, AddressOf HistoryBack)
AddKeyToMask("down", DefaultMaskName, AddressOf HistoryNext)
AllowAlphaNumForMask(DefaultMaskName)
AllowSpezialCharsForMask(DefaultMaskName)
End Sub
Public Sub AddKeyToMask(ByVal KeyName As String, ByVal MaskName As
String, ByVal KeyAction As Action)
If KeyMasks.ContainsKey(MaskName) Then
Select Case KeyName
Case "a"
KeyMasks(MaskName).Add(New ConsoleKeyInfo("a"c,
ConsoleKey.A, False, False, False), New InputAction With {.DisplayChar =
"a", .BufferChar = "a", .Action = KeyAction})
Case "b"
KeyMasks(MaskName).Add(New ConsoleKeyInfo("b"c,
ConsoleKey.B, False, False, False), New InputAction With {.DisplayChar =
"b", .BufferChar = "b", .Action = KeyAction})
Case "c"
KeyMasks(MaskName).Add(New ConsoleKeyInfo("c"c,
ConsoleKey.C, False, False, False), New InputAction With {.DisplayChar =
"c", .BufferChar = "c", .Action = KeyAction})
[...]
Case "rtn"
KeyMasks(MaskName).Add(New
ConsoleKeyInfo(Convert.ToChar(13), ConsoleKey.Enter, False, False, False),
New InputAction With {.DisplayChar = "", .BufferChar = "", .Action =
KeyAction})
Case "esc"
KeyMasks(MaskName).Add(New
ConsoleKeyInfo(Convert.ToChar(27), ConsoleKey.Escape, False, False, False),
New InputAction With {.DisplayChar = "", .BufferChar = "", .Action =
KeyAction})
Case "del"
KeyMasks(MaskName).Add(New
ConsoleKeyInfo(Convert.ToChar(0), ConsoleKey.Delete, False, False, False),
New InputAction With {.DisplayChar = "", .BufferChar = "", .Action =
KeyAction})
Case "bsp"
KeyMasks(MaskName).Add(New
ConsoleKeyInfo(Convert.ToChar(8), ConsoleKey.Backspace, False, False,
False), New InputAction With {.DisplayChar = "", .BufferChar = "", .Action =
KeyAction})
Case "home"
KeyMasks(MaskName).Add(New
ConsoleKeyInfo(Convert.ToChar(0), ConsoleKey.Home, False, False, False), New
InputAction With {.DisplayChar = "", .BufferChar = "", .Action = KeyAction})
Case "end"
KeyMasks(MaskName).Add(New
ConsoleKeyInfo(Convert.ToChar(0), ConsoleKey.End, False, False, False), New
InputAction With {.DisplayChar = "", .BufferChar = "", .Action = KeyAction})
Case "left"
KeyMasks(MaskName).Add(New
ConsoleKeyInfo(Convert.ToChar(0), ConsoleKey.LeftArrow, False, False,
False), New InputAction With {.DisplayChar = "", .BufferChar = "", .Action =
KeyAction})
Case "right"
KeyMasks(MaskName).Add(New
ConsoleKeyInfo(Convert.ToChar(0), ConsoleKey.RightArrow, False, False,
False), New InputAction With {.DisplayChar = "", .BufferChar = "", .Action =
KeyAction})
Case "up"
KeyMasks(MaskName).Add(New
ConsoleKeyInfo(Convert.ToChar(0), ConsoleKey.UpArrow, False, False, False),
New InputAction With {.DisplayChar = "", .BufferChar = "", .Action =
KeyAction})
Case "down"
KeyMasks(MaskName).Add(New
ConsoleKeyInfo(Convert.ToChar(0), ConsoleKey.DownArrow, False, False,
False), New InputAction With {.DisplayChar = "", .BufferChar = "", .Action =
KeyAction})
Case Else
Throw New Exception("Unknown Key")
End Select
End If
End Sub
Public Sub AllowLowerAlphaForMask(ByVal MaskName)
If KeyMasks.ContainsKey(MaskName) Then
For Each LowerAlpha As String In
"abcdefghijklmnopqrstuvwxyz"
AddKeyToMask(LowerAlpha, MaskName, AddressOf
AddToInputBuffer)
Next
End If
End Sub
Private Function AddToInputBuffer(ByVal Key As ConsoleKeyInfo, ByVal
InputAction As InputAction) As Boolean
If InputBufferPos = InputBuffer.Length Then
InputBuffer &= InputAction.BufferChar
InputBufferPos += 1
Console.Write(InputAction.DisplayChar)
OutputBufferPos.Left += 1
ElseIf InputBufferPos < InputBuffer.Length Then
InputBuffer = InputBuffer.Insert(InputBufferPos,
InputAction.BufferChar)
InputBufferPos += 1
Console.Write(InputAction.DisplayChar)
OutputBufferPos.Left += 1
Console.Write(InputBuffer.Substring(InputBufferPos,
InputBuffer.Length - InputBufferPos))
Console.CursorLeft = OutputBufferPos.Left
Else
Throw New OverflowException("BufferPos behind last Buffer
element.")
End If
Return True
End Function
Public Function ReadExended() As String
InputBuffer = ""
InputBufferPos = 0
With OutputBufferPos
.Left = Console.CursorLeft
.Top = Console.CursorTop
End With
ReadLineRootPoint = OutputBufferPos
While (True)
Dim Key As ConsoleKeyInfo = Console.ReadKey(True)
Try
Dim IA As InputAction = CurrentKeyMask(Key)
Dim IAR As Boolean = IA.Action.Invoke(Key, IA)
If IAR = False Then Exit While
Catch ex As Exception
Console.WriteLine()
Console.WriteLine("nicht gefunden - {0}", ex.ToString())
Console.WriteLine("Key: {0}, KeyChar: {1}, KeyCharCHR:
{2}, Modifier: {3}", Key.Key.ToString(), Key.KeyChar.ToString(),
Convert.ToInt32(Key.KeyChar).ToString(), Key.Modifiers.ToString())
End Try
End While
If _EnableHistory = True Then
InputBufferHistory.Enqueue(InputBuffer)
End If
Return InputBuffer
End Function
http://www.nabble.com/file/p22011524/ExtendedConsole.vb ExtendedConsole.vb
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