Visual Basic

Re: How to make an asynchronous call to a web service in vb.net framework 3.5

13-Nov-08 5:37

This may be silly, but do you have the web service running?

dreddy713-Nov-08 5:57

dreddy7

13-Nov-08 5:57

Yeah the web service is running...I am actually new to web services. So, is there any way to confirm if it is actually running or not. And the code that I have on my Windows app is a simple one for now.

On a button click event , it just says:

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'Cool is the name of my webservice
Dim objService as New Cool.Service
TextBox1.Text = objService.HelloWorld()
end sub

And the web method in the Cool Service is:
<webmethod()> _
Public Function HelloWorld() As String
Return "Hello World"
End Function

Now what is an asynchronous web request-response? I have the following method which does a httpwebrequest-httpwebresponse:
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim myHttpWebRequest As HttpWebRequest
Dim myHttpWebResponse As HttpWebResponse
Dim receiveStream As Stream
Dim encode As Encoding
Dim sr As IO.StreamReader
Dim strUrl As String = "http://localhost:5404/CoolService/Service.asmx"

Try
myHttpWebRequest = CType(WebRequest.Create(strUrl), HttpWebRequest)
myHttpWebResponse = CType(myHttpWebRequest.GetResponse(), HttpWebResponse)
receiveStream = myHttpWebResponse.GetResponseStream()
encode = System.Text.Encoding.GetEncoding("utf-8")
sr = New StreamReader(receiveStream, encode)

Do Until sr.Peek = -1
TextBox2.Text += sr.ReadLine
Loop
Catch ex As System.Net.WebException
MsgBox(ex.Message)
Finally
sr.Close()
myHttpWebResponse.Close()
End Try
End Sub

Is this asynchronous?

Re: How to make an asynchronous call to a web service in vb.net framework 3.5

Paul Conrad13-Nov-08 6:15

Re: How to make an asynchronous call to a web service in vb.net framework 3.5

13-Nov-08 6:15

dreddy7 wrote:
.I am actually new to web services.

Same here, and have picked up on it relatively quickly. For future reference, put your code inside the code block or inline code tags at the bottom of the reply form. It makes it easier to read Cool | :cool:

dreddy7 wrote:
the code that I have on my Windows app is a simple one for now.

At least you are not dealing with passing xml right now like I am trying to do. My case works sort of okay but even though I am returning XmlDocument, my test app is looking for XmlElement. Now, set aside my banter, back to your problem....

Dim strUrl As String = "http://localhost:5404/CoolService/Service.asmx", I took out CoolService, and left it as Dim strUrl As String = "http://localhost:5404/Service.asmx" and it looks like it worked. Suspicious | :suss:

dreddy713-Nov-08 6:23

dreddy7

13-Nov-08 6:23

Wow...thats great! Actually I need to pass an xmlDoc and receive an ID in response to it from the webservice. But what I am thinking is, if I get this simple one to work...we can definetely replace the strings with whatever we want. Am I making sense?
Can you please discuss more on making asynchronous calls? Smile | :)

Re: How to make an asynchronous call to a web service in vb.net framework 3.5

Paul Conrad13-Nov-08 6:29

Re: How to make an asynchronous call to a web service in vb.net framework 3.5

13-Nov-08 6:29

dreddy7 wrote:
Actually I need to pass an xmlDoc and receive an ID in response to it from the webservice.

It's not that tough actually.

dreddy7 wrote:
Can you please discuss more on making asynchronous calls?

I've stuck with just invoking the method, here is what I've done, minus any client intellectual property...

<webmethod()> _
    Public Function GetContact(ByVal contactID As Integer) As XmlDocument
        Dim ContactDataSet As New ContactDataSet
        Dim ContactDataAdapter As New ContactDataSetTableAdapters.ContactTableAdapter

        ContactDataAdapter.FillByID(ContactDataSet.ContactTable, contactID)

        Dim memStream As New System.IO.MemoryStream
        Dim xml As New XmlTextWriter(memStream, System.Text.Encoding.UTF8)
        ContactDataSet.ContactTable.WriteXml(xml)

        Dim myXDoc As New XmlDocument()
        memStream.Flush()
        memStream.Position = 0
        myXDoc.Load(memStream)
        Return myXDoc
    End Function

It very happily gags up the correct data.

Paul Conrad13-Nov-08 6:42

Re: How to make an asynchronous call to a web service in vb.net framework 3.5

13-Nov-08 6:42

Here is a Google search [^] I am going to look through.

Paul Conrad13-Nov-08 6:22

Align form with Excel Window

13-Nov-08 6:22

Well, disregard my latest post, it only gave back the entire http response. You may have to hand pick out the returned value out of the http response, perhaps through regular expressions.

craigmg7812-Nov-08 9:19

craigmg78

12-Nov-08 9:19

I am automating excel and would like to align the lefts of my VB.NET form and Excel application. Unfortunately, the "left" in Excel is on a different scale than the "left" of the windows forms. I would like to use code like:

Me.Left = oApp.Left

where oApp refers to the Excel application. This, however, fails to left align these windows. I think I'm missing the big picture here. Anyone have any suggestions? Thanks!

- Craig

"That rug really tied the room together."

Dave Kreskowiak12-Nov-08 10:42

12-Nov-08 10:42

Yep, you're missing it alright. The Left in the Excel.Application class is not in pixels, but in points. Documentation on Left[^]...

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

craigmg7812-Nov-08 10:59

craigmg78

12-Nov-08 10:59

I see... So that means there isn't a good way to do what I want to do?

"That rug really tied the room together."

sph3rex12-Nov-08 11:12

12-Nov-08 11:12

erhmmm converting points to pixels or if it's out of hand using the old fashion GetWindowEx and GetWindowRect from the Win32 API.
An aproximation is 1.3 ... so for let's say 3 points u have about 3,9 pixels.

Dave Kreskowiak13-Nov-08 4:05

Sending Bytes Packet to Remote System

13-Nov-08 4:05

I didn't say that. It just means you have to use a different method to get the window rectangle. Use the Process class to find the EXCEL process, the get it's MainWindowHandle. You can then use that handle to call Win32's GetWindowRect function (see www.pinvoke.net for examples) to get the Left position in pixels.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

ajorge200812-Nov-08 4:48

ajorge2008

12-Nov-08 4:48

Good afternoon!

Currently i'm working with .Net Framework 2.0 SerialPort Class and trying to send a bunch of bytes as a command to obtain data from a remote system.
The GSM connection is well done, but after this connection, i'm sending a command regarding the communication protocol of the remote equipment, but i don't get any kind of response.

Could anyone help me with this? I'm sending the code i've wrote:

Option Explicit On
Option Strict Off

Imports System.IO.Ports

Public Class Form1

Public Delegate Sub StringSubPointer(ByVal Buffer As String)
Dim WithEvents spObject As New SerialPort
Dim Test_Command As Boolean

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Button1.BackColor = Color.Silver
Button2.BackColor = Color.Silver
Button3.BackColor = Color.Silver

With spObject
.PortName = "COM6"
.BaudRate = 9600
.Parity = Parity.None
.DataBits = 8
.StopBits = StopBits.One
.DtrEnable = True
.RtsEnable = True
'.ReadTimeout = 12000
'.NewLine = Chr(13) 'CR - Carriage Return
'.Encoding = System.Text.Encoding.GetEncoding(28591)
End With

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

If spObject.IsOpen Then

spObject.Close()

End If

Try

spObject.Open()

Catch ex As Exception

MsgBox("It wasn't possible to open your Serial Com Port! Please try again...", MsgBoxStyle.OkOnly, "Warning")
Return

End Try

Try

spObject.Write("+++" + vbCr)
spObject.Write("ATDPhoneNumber" + vbCr)

RichTextBox1.Clear()

RichTextBox1.Text = "Dialing with the Remote System... Please wait for a few seconds..."

Catch ex As Exception

MsgBox("It wasn't possible to connect with the Remote System! Please try again...", MsgBoxStyle.OkOnly, "Warning")
Return

End Try

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

Button1.BackColor = Color.Silver
Button2.BackColor = Color.Green

Dim btArray As Byte() = {68, 00, 00, 68, 00, 00, 00, 00, 80, 00, 01, 81, 00, 16}

Try

spObject.Write(btArray, 0, 14)

RichTextBox1.Clear()
RichTextBox1.Text = "Your command has been correctly sent. Please standby for data response..."

Catch ex As Exception

Button2.BackColor = Color.Silver
MsgBox("Sorry, it wasn't possible to send your command. Please try again...", MsgBoxStyle.OkOnly, "Warning")

Return

End Try

End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

Button1.BackColor = Color.Silver
Button2.BackColor = Color.Silver
Button3.BackColor = Color.Green

RichTextBox1.Clear()
RichTextBox1.Text = "Disconnecting from the Remote System..."

Try

With spObject

.Write("+++" + vbCr)
.Write("ATH0" + vbCr)

End With

Catch ex As Exception

RichTextBox1.AppendText("It wasn't possible to disconnect from the Remote System. Please try again!")
Button3.BackColor = Color.Silver
Return

End Try

Try

With spObject

.Close()

End With

Catch ex As Exception

RichTextBox1.AppendText("It wasn't possible to close your communication port! Please try again.")
Button3.BackColor = Color.Silver
Return

End Try

Try

Me.Close()

Catch ex As Exception

RichTextBox1.Clear()
Button3.BackColor = Color.Silver
RichTextBox1.Text = "It wasn't possible to close this application! Please try again."
Return

End Try

End Sub

Private Sub Receiver(ByVal sender As Object, ByVal e As SerialDataReceivedEventArgs) Handles spObject.DataReceived

Button2.BackColor = Color.Silver

Me.BeginInvoke(New StringSubPointer(AddressOf Display), spObject.ReadLine)

End Sub

Private Sub Display(ByVal Buffer As String)

RichTextBox1.AppendText(Buffer)

End Sub

End Class

Best Regards.

Re: Sending Bytes Packet to Remote System

Dave Kreskowiak12-Nov-08 6:38

Re: Sending Bytes Packet to Remote System

12-Nov-08 6:38

There are 3 glaring possibilities. The first is you have to make asolutely sure your communication parameters are correct, like baud rate, data bits, stop bits, parity, ....

The second is that you're call to spObject.ReadLine will only work if the device sent back what .NET interprets as a Newline[^] sequence in the byte stream. If this sequence isn't there, then the call will throw a Timeout exception.

The third possibility is that you didn't send the command to the device in a manner, or format, the device expects. Is the byte sequence correct?? Is the command terminated correctly?? Was it sent with extra bytes appended to it that the device didn't expect (like CR and LF)??

This is going to be a difficult question to answer because YOU have the hardware, not us. We have nothing to test this against. It's going to take a bunch of research on the device and trial-and-error fiddling on your part to get this to work.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

Rajesh Anuhya12-Nov-08 17:46

Rajesh Anuhya

12-Nov-08 17:46

Very good answer by Dave Kreskowiak

first check from the hyperterminal to check your sending protocal is correct,

after u got response then look through your code for bugs.

don't use the spobject.readline , this statement will not accept the extended ascii chart characters. use spobject.readbytes

Rajesh B --> A Poor Workman Blames His Tools <--

Trimming special characters in VB 6.0

indian14312-Nov-08 4:33

12-Nov-08 4:33

Hi,

I have a string in which I have to replace all occurances of special characters with null string or character. Trim(Char[]) function is trimming only start and end of the string but I need to Trim the complete string between also.

Can anybody please help me.

Thanks
Aleem Mohammad.

Thanks & Regards,

Md. Abdul Aleem
NIIT technologies

Jon_Boy12-Nov-08 6:07

Jon_Boy

12-Nov-08 6:07

Use replace instead of trim.

Dim line As String = "abc#$*xyz"
line = Replace(line, "#$*", "")

Any suggestions, ideas, or 'constructive criticism' are always welcome.

"There's no such thing as a stupid question, only stupid people." - Mr. Garrison

indian14312-Nov-08 6:12

12-Nov-08 6:12

Hi,

Good Idea but I one problem with this, the sequence of special characters is not known and wherever any special character appears that should be replaced with null string.

string may come like this and even in different way.
"asfgd%dfg&sdfd@#$sfdgfg&fdgfd*fgfdg$%$%$rtee&*were$^&^&dfds43636"

So any idea please will be a great helpfull.

Thanks a Lot,
Aleem Mohammad.

Thanks & Regards,

Md. Abdul Aleem
NIIT technologies

sph3rex12-Nov-08 6:35

12-Nov-08 6:35

You could think it a lil bit different ... just a thought

use System.Text.RegularExpressions.Regex with a negated class

something like "[^a-z0-9_]" where the group represents negated valid characters(meaning anything that is not there between those [] brackets will be matched) and use System.Text.RegularExpressions.Regex.Replace("your incoming string","string to replace the occurences of invalid chars");

indian14312-Nov-08 6:56

12-Nov-08 6:56

Hi,

Good Idear but can u please help me by giving a small code snippet if possible.

And can u please atleast hint me how to show the negation expression in a RegularExpression. That would help me a lot.

Thanks,
Aleem Mohammad.

Thanks & Regards,

Md. Abdul Aleem
NIIT technologies

sph3rex12-Nov-08 7:06

12-Nov-08 7:06

dim myString as string = "my incoming string"
Dim reg as new System.Text.RegularExpressions.Regex("[^a-z0-9_]", System.Text.RegularExpressions.RegexOptions.IgnoreCase)
dim resultString as String = reg.replace(myString,"")

indian14312-Nov-08 7:36

12-Nov-08 7:36

Hi,

Thanks for the help but only one final question I may need to use the special character Space as I am going to use the string for Directory name, can u please give me idea how to mention spaces in regular expression.

Thanks,
Aleem Mohammad.

Thanks & Regards,

Md. Abdul Aleem
NIIT technologies

Dave Kreskowiak12-Nov-08 10:33

12-Nov-08 10:33

*> SMACK <* That's for writing his code for him. Now he's getting paid to turn in YOUR work.

A guide to posting questions on CodeProject[^]

Dave Kreskowiak
Microsoft MVP
Visual Developer - Visual Basic
2006, 2007, 2008

sph3rex12-Nov-08 10:57