PreProcessMessage

[Geoff Jones]

Hiya

Can anybody help me with the following?

I'm overriding PreProcessMessage on a DataGrid in order to capture keys.
However, the function is only called sometimes i.e. there doesn't seem to be
any pattern.

Can anybody help?

Geoff

 

[Zoury]

Hi Goeff!

What keys ?

 

[Zoury]

What keys ?

for my own knowledge... shoudn't it be "which keys" or i can say both ?

 

[Geoff Jones]

Hi Zoury

Any really e.g. "A", "B", "Alt Z"

Geoff

 

[Zoury]

ok then, try something like this :
http://groups.google.com/[email protected]

 

[Zoury]

oups there is something missing..

if you want to get notify for regular keys (A, b, 9, etc..) you can handle
WM_KEYDOWN too
'***
Public Class DataGridEx
Inherits DataGrid

Private Const WM_KEYDOWN As Int32 = &H100
Private Const WM_SYSKEYDOWN As Int32 = &H104
Private Const VK_DOWN As Int32 = &H28

Protected Overrides Function ProcessCmdKey(ByRef msg As
System.Windows.Forms.Message, ByVal keyData As System.Windows.Forms.Keys) As
Boolean

If (msg.Msg = WM_SYSKEYDOWN) Then
Console.WriteLine("WM_SYSKEYDOWN")
If (msg.WParam.ToInt32() = VK_DOWN) Then
Console.WriteLine("VK_DOWN")
If (Control.ModifierKeys = Keys.Alt) Then
Console.WriteLine("bingo!")
Return True
End If
End If
ElseIf (msg.Msg = WM_KEYDOWN) Then
Console.WriteLine("VK: {0}, Char: {1}", msg.WParam.ToInt32(),
CType(msg.WParam.ToInt32(), Keys).ToString())
End If

Return MyBase.ProcessCmdKey(msg, keyData)
End Function

End Class
'***

I'm not a hundred percent sure that a Virtual Key code (WParam) could be
convert into a Keys type though...

 

[Geoff Jones]

Thanks Zoury

oups there is something missing..

if you want to get notify for regular keys (A, b, 9, etc..) you can handle
WM_KEYDOWN too
'***
Public Class DataGridEx
Inherits DataGrid

Private Const WM_KEYDOWN As Int32 = &H100
Private Const WM_SYSKEYDOWN As Int32 = &H104
Private Const VK_DOWN As Int32 = &H28

Protected Overrides Function ProcessCmdKey(ByRef msg As
System.Windows.Forms.Message, ByVal keyData As System.Windows.Forms.Keys)
As
Boolean

If (msg.Msg = WM_SYSKEYDOWN) Then
Console.WriteLine("WM_SYSKEYDOWN")
If (msg.WParam.ToInt32() = VK_DOWN) Then
Console.WriteLine("VK_DOWN")
If (Control.ModifierKeys = Keys.Alt) Then
Console.WriteLine("bingo!")
Return True
End If
End If
ElseIf (msg.Msg = WM_KEYDOWN) Then
Console.WriteLine("VK: {0}, Char: {1}", msg.WParam.ToInt32(),
CType(msg.WParam.ToInt32(), Keys).ToString())
End If

Return MyBase.ProcessCmdKey(msg, keyData)
End Function

End Class
'***

I'm not a hundred percent sure that a Virtual Key code (WParam) could be
convert into a Keys type though...