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control and plus key, simultaneous

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guest

Post subject: control and plus key, simultaneous

Posted: Wed Feb 18, 2009 9:58 pm

Hello
I want to zoom in and out of an image with control + and -, I want to use the upper function of the = key,not the big plus key of the numberpad. I cannot find the vbkeycode nor the keydown for these keys!
Visual Basic 6
Any help would be fantastic

Regards
David

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Moglor

Post subject:

Posted: Thu Feb 19, 2009 4:58 pm

Mumbo Jumbo

Joined: Fri Aug 20, 2004 1:15 pm
Posts: 804
Location: Michigan, USA

just use the keycode of the = key (187)
- (minus) key is 189

Code:

Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer)
    If KeyCode = 187 Then
        Form1.Caption = "Plus Key Down"
    ElseIf KeyCode = 189 Then
        Form1.Caption = "Minus Key Down"
    Else
        Form1.Caption = "Some other key Down"
    End If
End Sub

Code:

Private Sub Form_KeyPress(KeyAscii As Integer)
    If KeyAscii = Asc("=") Then
        Form1.Caption = "Plus Key Down"
    ElseIf KeyAscii = Asc("-") Then
        Form1.Caption = "Minus Key down"
    Else
        Form1.Caption = "Some other key Down"
    End If
End Sub

_________________
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Sirisian

Post subject:

Posted: Thu Feb 19, 2009 5:06 pm

Dexterous Droid

Joined: Fri Dec 24, 2004 8:13 pm
Posts: 3769
Location: Michigan, 'US' of 'A'. Below Canada.

Also you can MessageBox the KeyCode

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jayz

Post subject:

Posted: Tue Feb 24, 2009 6:19 am

Cubic Contributor

Joined: Tue Jul 08, 2008 9:03 am
Posts: 79

to check the state of two keys simultaneously using just the keydown / keyup event (not any other API's), you would need to create two boolean variables- one for each of the keys you're testing

dim ctrl as boolean
dim plus as boolean

on keydown:

if keycode = vbKeyControl (or whatever it is) then
ctrl = true
end if

if keycode = vbkeyplus (or w/e) then
plus = true
end if

do the opposite on key up. Then you can check if ctrl = true and plus = true. Unless you feel like using Windows API or DirectInput, thats the way to go.

_________________
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