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Convert.ToChar and number pad

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Convert.ToChar and number pad, unexpected results when trying to convert numberpad keys

Locuranis	8 Jul, 2008 - 09:47 AM Post #1
New D.I.C Head Joined: 14 Jun, 2008 Posts: 9	Hello. I'm currently working on a calculator, (yes, one of those again), and I have it functioning for the most part. Now I'm trying to allow for keyboard input, but when I use Convert.ToChar with numberpad keys, it displays letters instead. I know if I subtract 48 from the keycode value I'll get the corresponding number, but just wondering if there's another way to go about it. CODE Private Sub Form1_KeyDown(ByVal sender As Object, _ ByVal e As System.Windows.Forms.KeyEventArgs) _ Handles Me.KeyDown Select Case e.KeyCode Case Keys.D0 To Keys.D9, Keys.NumPad0 To Keys.NumPad9 btnNumbers(Convert.ToChar(e.KeyCode)) End Select End Sub I know that's just one Case condition there. I have some others planned, but I wanted to make this work first. Any help appreciated. Thank you. This post has been edited by Locuranis: 8 Jul, 2008 - 09:49 AM
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modi123_1	RE: Convert.ToChar And Number Pad 8 Jul, 2008 - 10:07 AM Post #2
Suiter #2 Joined: 12 Jun, 2008 Posts: 1,216 Thanked: 49 times Dream Kudos: 150 My Contributions	QUOTE(Locuranis @ 8 Jul, 2008 - 12:47 PM) Hello. I'm currently working on a calculator, (yes, one of those again), and I have it functioning for the most part. Now I'm trying to allow for keyboard input, but when I use Convert.ToChar with numberpad keys, it displays letters instead. I know if I subtract 48 from the keycode value I'll get the corresponding number, but just wondering if there's another way to go about it. CODE Private Sub Form1_KeyDown(ByVal sender As Object, _ ByVal e As System.Windows.Forms.KeyEventArgs) _ Handles Me.KeyDown Select Case e.KeyCode Case Keys.D0 To Keys.D9, Keys.NumPad0 To Keys.NumPad9 btnNumbers(Convert.ToChar(e.KeyCode)) End Select End Sub I know that's just one Case condition there. I have some others planned, but I wanted to make this work first. Any help appreciated. Thank you. why are you trying to convert from the enumeration? keep it in the enumeration! (you can compare it against specific enumerations at any time)
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Locuranis	RE: Convert.ToChar And Number Pad 8 Jul, 2008 - 10:35 AM Post #3
New D.I.C Head Joined: 14 Jun, 2008 Posts: 9	Because I'm trying to pass the number character as a string, which is then handled in the function. Passing the keycode itself isn't what I want to do. I'm not comparing anything. If a user hits a number either at the top or on the keypad, it should, after some flag checking, display the number in the output. The above code works okay in doing that with the numbers keys at the top, but not in the number pad.
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Jayman	RE: Convert.ToChar And Number Pad 8 Jul, 2008 - 11:34 AM Post #4
Student of Life Joined: 26 Dec, 2005 Posts: 8,063 Thanked: 159 times Dream Kudos: 500 Expert In: Everything My Contributions	You could use the KeyPress event to capture the keystrokes. Then you can use the KeyChar to get the character representation of the numbers. CODE Private Sub Form1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Me.KeyPress If e.KeyChar >= "0" And e.KeyChar <= "9" Then btnNumbers(e.KeyChar) End If End Sub
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Locuranis	RE: Convert.ToChar And Number Pad 8 Jul, 2008 - 11:46 AM Post #5
New D.I.C Head Joined: 14 Jun, 2008 Posts: 9	QUOTE(jayman9 @ 8 Jul, 2008 - 12:34 PM) You could use the KeyPress event to capture the keystrokes. Then you can use the KeyChar to get the character representation of the numbers. Thank you, this managed to work and cut down on code. Originally I had a select case for each key, so that nixes about 10+ lines of code to just three. Thanks again!
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