|
Then the same applies as for any keyboard.
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
|
|
|
|
|
Yes, and the behaviour of the barcode reader is specific to its design & manufacture. So you still need to read the manual to see how it presents itself and its data.
|
|
|
|
|
What about programs that can work with any kind of usb barcode readers ? so they are general and what they need is only to plug the barcode reader.
|
|
|
|
|
Yes, and what happens then?
|
|
|
|
|
The barcode reader is working as expected.
I've seen some programs ( of course I don't have the code ) that can use any type of USB barcode readers ( without any special configuration ) and can distinguish between 2 modes ( for example focusing a textbox when I type with keyboard nothing is displayed , when I read with barcode reader the barcode is displayed ). And also if I focus a listbox or another control in the form, and read with barcode reader , the barcode is read and displayed in the right textbox without focusing it.And I've tested these programs even with cheap no name Chinese barcode readers and always work perfectly.
So it seems a way should exist.
|
|
|
|
|
desanti wrote: So it seems a way should exist.
Simple; learn C++ and write a generic device driver.
..but in VB.NET, you are limited to what the software that is installed for the device allows you to do.
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
|
|
|
|
|
These are USB barcode readers that are configured to act like keyboards. No software are needed to install for these devices. Windows has that "Generic drivers" built in.So I can plug different kinds of these barcode readers , at the same Pc and they use the same driver built in on windows.
So these barcode readers are like keyboards with only 1 difference : They can "type" much more chars at a small time compared with typing on keyboard.
I hope that someone can help me working on this idea.
|
|
|
|
|
Yes, Windows already has multiple generic device-drivers. The functionality provided is exactly that, it fits most needs.
If you need more, you contact the manufacturer and see if they have an SDK;
..but from VB? Good luck there 
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
|
|
|
|
|
Then those programs must be communicating direct to the device(s) via the USB interface. Alternatively, as Dave K already suggested, the device sends extra data to identify itself. Google (as usual) is the place to start your research.
|
|
|
|
|
I've tested and it seems that these barcode readers only send a list of chars and an "ENTER" at the end. So no special characters.
|
|
|
|
|
|
No , because even on normal keyboard I can write and press ENTER at the end. How to distinguish that was from keyboard or from Barcode reader ?
|
|
|
|
|
|
There are multiple types of barcode readers. What you're talking about is a "keyboard wedge" type that, as you already know, act like a keyboard.
But, usually they are programmable to prepend and/or append character data to the barcode it reads. This allows applications to add an "attention sequence" to the data it's "keying" into your application. Typically, your application looks for this data coming from the keyboard and can use that data to know that the next characters are part of the barcode until it sees the appended sequence.
This makes it possible to use the data WITHOUT having to know which "keyboard" the data came from. THIS IS WHY YOU READ THE DOCUMENTATION ON THE DEVICE YOU'RE USING!
There are also other interface types, such as Ethernet-based devices, that you can code against. But, again, this is where you read the documentation on your device.
|
|
|
|
|
Option 1 is a HUGE pain in the ass to implement and isn't reliable.
Option 2 is how this is normally done in a Windows Forms app.
|
|
|
|
|
I've seen some programs ( of course I don't have the code ) that can use any type of USB barcode readers ( without any special configuration ) and can distinguish between 2 modes ( for example focusing a textbox when I type with keyboard nothing is displayed , when I read with barcode reader the barcode is displayed ). And also if I focus a listbox or another control in the form, and read with barcode reader , the barcode is read and displayed in the right textbox without focusing it.And I've tested these programs even with cheap no name Chinese barcode readers and always work perfectly.
So it seems a way should exist.
|
|
|
|
|
I already told you how it works. Option #2.
How do I know? I've done it that way.
Digging through the whole "figure out which USB device the key came from" thing is a bit excessive.
|
|
|
|
|
ok , but option 2 handle all messages at form level , but the messages can be from barcode readers or from keyboard.
How to distinguish ?
|
|
|
|
|
I already told you how. Prefix and Postfix sequences attached to the barcode.
|
|
|
|
|
Sorry , but these barcode readers cannot be configured to have a special character. Have no software that can use to configure these.
They only produce a list of chars and an "enter" at the end.
The only difference is that the barcode can produce much more chars at a small time compared with typing on keyboard. For that I hope to get some help to work on this idea because it seems is the only difference that these barcode have compared with a keyboard.
|
|
|
|
|
|
Thank you !
I've already read the article for RAW Input.
I've tested and can detect from which device the input came from.
But the problem remain because he detect both keyboard and Barcode reader as Keyboard1 and keyboad2. The problem is that how can I define in my application ? Because both keyboard and Barcode reader are USB , and when I will distribute my application , on one computer the barcode reader may be Keyboard 1 , on another may be Keyboard 2..? So this is a problem.
Do you have any suggestion ?
|
|
|
|
|
yeah, do a bunch of research. I can't do it for you. I simply don't have the time.
|
|
|
|
|
Hi there,
I have a one big prob.
I want to generate xml file with a specific format Like this syntax!:
<declarationrelevededuction xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<identifiantfiscal>1088081
<annee>2016
<periode>8
<regime>1
<relevedeductions>
<rd>
<ord>1
<num>FF160400146
<des>PRESTATION
<mht>2400.00
<tva>480.00
<ttc>2880.00
<reff>
<if>52803595
<nom>LEADER SOFT
<ice>001540114000046
<tx>20.00
<mp>
<id>2
<dpai>2016-08-01
<dfac>2016-01-30
<rd>
<ord>2
<num>FF160400147
<des>PRESTATION
<mht>1500.00
<tva>300.00
<ttc>1800.00
<reff>
<if>52803595
<nom>LEADER SOFT
<ice>001540114000046
<tx>20.00
<mp>
So, I've created form with button to generate the xml files and I created this code for That:
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim xmlsetting As New XmlWriterSettings
Dim writxml As XmlWriter = XmlWriter.Create("mytest.xml", xmlsetting)
Try
With writxml
.WriteStartDocument()
.WriteStartElement("DeclarationReleveDeduction")
.WriteStartElement("identifiantFiscal")
.WriteString("111111")
.WriteEndElement()
.WriteStartElement("annee")
.WriteString("2016")
.WriteEndElement()
.WriteStartElement("periode")
.WriteString("8")
.WriteEndElement()
.WriteStartElement("regime")
.WriteString("1")
.WriteEndElement()
.WriteStartElement("Relvededution")
For i As Integer = 1 To 10
.WriteStartElement("Id")
.WriteString(i)
.WriteStartElement("Nom")
.WriteString("Nom " & i)
.WriteEndElement()
.WriteStartElement("prenom")
.WriteString("Prenom " & i)
.WriteEndElement()
.WriteStartElement("Adresse")
.WriteString("Adresse " & i)
.WriteEndElement()
.WriteEndElement()
Next
.WriteEndElement()
.WriteEndElement()
.WriteEndDocument()
.Close()
End With
MsgBox("fichier a été généré avec succès", vbInformation)
Catch ex As Exception
MsgBox(ex.Message)
End Try
End Sub
when I generated the xml file I have got like this format:
<declarationrelevededuction><identifiantfiscal>111111<annee>2016<periode>8<regime>1<relvededution><id>1<nom>Nom 1<prenom>Prenom 1<adresse>Adresse 1<id>2<nom>Nom 2<prenom>Prenom 2<adresse>Adresse 2<id>3<nom>Nom 3<prenom>Prenom 3<adresse>Adresse 3<id>4<nom>Nom 4<prenom>Prenom 4<adresse>Adresse 4<id>5<nom>Nom 5<prenom>Prenom 5<adresse>Adresse 5<id>6<nom>Nom 6<prenom>Prenom 6<adresse>Adresse 6<id>7<nom>Nom 7<prenom>Prenom 7<adresse>Adresse 7<id>8<nom>Nom 8<prenom>Prenom 8<adresse>Adresse 8<id>9<nom>Nom 9<prenom>Prenom 9<adresse>Adresse 9<id>10<nom>Nom 10<prenom>Prenom 10<adresse>Adresse 10
Please help me I need to do that in this days of current month  
|
|
|
|
|
One way is to create a strong typed class and just code to it. This method can create SOAP calls and WSDL files for transmitting or writing an API for. This is how I do it now.
<Serializable()>
Public Class ws_subscribersCount_Response
Private m_response_Code As String
Private m_response_Text As String
Private m_count As Integer
Public Property response_Code As String
Get
Return m_response_Code
End Get
Set(value As String)
m_response_Code = value
End Set
End Property
Public Property response_Text As String
Get
Return m_response_Text
End Get
Set(value As String)
m_response_Text = value
End Set
End Property
Public Property count As Integer
Get
Return m_count
End Get
Set(value As Integer)
m_count = value
End Set
End Property
End Class
To populate the object, just create a new one and transmit it back to the caller, or send it to an endpoint.
Dim subscribers as New ws_subscribersCount_Response()
subscribers.response_Code = "OK"
subscribers.response_Text = m_count & " subscribers have loaded successfully"
subscribers.count = m_count
Another way is to create a XSD file and use Xsd.Exe to convert it to a class and code against the class.
After the program creates a class file, you drop the class in your project. This is how I use to do it.
How to make an XSD file.
XML Schema Example[^]
After creating your XML class to to code against ...
You can read it from the disk drive
Create a new one and just transmit it
Write it to a disk drive.
Store it in a database
Dim writer As MemoryStream = Nothing
Dim XMLRequest As UPSRequest.AccessRequest
XMLRequest = New UPSRequest.AccessRequest
XMLRequest.AccessLicenseNumber = sUPSsi.AccessLicenseNumber
XMLRequest.UserId = sUPSsi.UserID
XMLRequest.Password = sUPSsi.Password
Dim serializer As XmlSerializer
serializer = New XmlSerializer(GetType(UPSRequest.AccessRequest))
writer = New MemoryStream()
serializer.Serialize(writer, XMLRequest)
writer.Position = 0
Dim request_serializer As XmlSerializer = Nothing
request_serializer = New XmlSerializer(GetType(UPSRequest.AccessRequest))
If (True = p_Write_Certification_Request) Then
Using request_writer As New StreamWriter(HttpContext.Current.Server.MapPath("~\Logs\UPS\"AccessRequest.xml"))
request_serializer.Serialize(request_writer, XMLRequest)
End Using
End If
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
