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ASP.Net and Barcode Scanner

P: n/a
Hi,
I'm working on a website where the user will have to scan a barcode
with a serial barcode scanner.

I get the scanner working and reading the barcode, but when I want to
write the string in a Textbox, it's not working. The Textbox remain
blank.

Here's the code:
WithEvents _comPort As New IO.Ports.SerialPort
Delegate Sub SetValue(ByVal barcode As String)

Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArgs) Handles Me.Load
' Initialize the scanner.
End Sub

Sub ShowValue(ByVal barcode As String)
TextBox1.Text = barcode
End Sub

Private Sub ReadBarcode(ByVal sender As Object, ByVal e As
IO.Ports.SerialDataReceivedEventArgs) Handles _comPort.DataReceived

Dim value As String
Dim targetMethod As Reflection.MethodInfo =
Me.GetType().GetMethod("ShowValue")
Dim deleg As SetValue =
DirectCast([Delegate].CreateDelegate(GetType(SetValue), Me,
targetMethod), _
SetValue)

value = _comPort.ReadLine
deleg.Invoke(value)
End Sub
Can somebody help me please!
Thanks

Chris

Jul 26 '07 #1
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2 Replies


P: n/a
hi,
you seem to do everything server side... but I think what you want to
achieve should be done client-side. imagine if you were to start 2 clients
connected to the page, which one your server will send the text to? (both?)
and it would mean the scanner is plugged in your server, which may not be
what you want.

I think the solution will be to get the value using javascript... can
javascript interact with COM ports, not that I know of...

The solution you may have is to install certain drivers (some serial scanner
have) so the input from your scanner is translated as if it were typed on
the keyboard. Then you'd not have to worry anymore about your scanner.

I hope it helps

ThunderMusic

<ch********@hotmail.comwrote in message
news:11**********************@b79g2000hse.googlegr oups.com...
Hi,
I'm working on a website where the user will have to scan a barcode
with a serial barcode scanner.

I get the scanner working and reading the barcode, but when I want to
write the string in a Textbox, it's not working. The Textbox remain
blank.

Here's the code:
WithEvents _comPort As New IO.Ports.SerialPort
Delegate Sub SetValue(ByVal barcode As String)

Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArgs) Handles Me.Load
' Initialize the scanner.
End Sub

Sub ShowValue(ByVal barcode As String)
TextBox1.Text = barcode
End Sub

Private Sub ReadBarcode(ByVal sender As Object, ByVal e As
IO.Ports.SerialDataReceivedEventArgs) Handles _comPort.DataReceived

Dim value As String
Dim targetMethod As Reflection.MethodInfo =
Me.GetType().GetMethod("ShowValue")
Dim deleg As SetValue =
DirectCast([Delegate].CreateDelegate(GetType(SetValue), Me,
targetMethod), _
SetValue)

value = _comPort.ReadLine
deleg.Invoke(value)
End Sub
Can somebody help me please!
Thanks

Chris

Jul 26 '07 #2

P: n/a
The solution you may have is to install certain drivers (some serial scanner
have) so the input from your scanner is translated as if it were typed on
the keyboard. Then you'd not have to worry anymore about your scanner.

I hope it helps
Thanks for the idea!

Did not found this option in the drivers but I made a program in
VB.Net that redirect the COMPort Input to keyboard and it's working
fine!

Chris

Jul 27 '07 #3

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