Class implementation for using webservices in ASP

asanoguera

3.73/5 (11 votes)

Jun 14, 2005

CPOL

134672

755

With that class you only have to set a few properties and you can access to the webservices, only need know the URL of webservice, the method to invoke, and parameters.

Download source files - 1.37 Kb

Introduction

Recently, I tried to use for the first time a webservice from an ASP page and I really had problems, after hours I could access to my webservice from ASP with Microsoft.XMLHTTP, but the code was not very easy (if it is your first time), so I decided to package the implementation in a simple vbscript class with a few properties that allow to access to a webservice.

The page that use the vbscript class is:

<!--#include virtual="/webservice.asp"-->
<html>
<head>
<title>testws</title>
</head>
<body>
<%
    dim ws
 
    set ws = new webservice
    ws.url = "http://localhost/yourwebservice.asmx"
    ws.method = "MethodName"
    ws.parameters.Add "ParamName1",1
    ws.parameters.Add "ParamName2",300
    ws.parameters.Add "ParamNameN",500
 
    ws.execute
    response.Write ws.response
 
    set ws = nothing
%>
</body>
</html>

Like you can see, it is very simple to use; define the properties, call the execute method and the property response will return the information from webservice.

The class that implement the call to webservice is:

<%
option explicit
class WebService
  public Url
  public Method
  public Response
  public Parameters
 
  public function execute()
    dim xmlhttp
    Set xmlhttp = CreateObject("Microsoft.XMLHTTP")
    xmlhttp.open "POST", Url & "/" & Method, false
    xmlhttp.setRequestHeader "Content-Type", "application/x-www-form-urlencoded"
    xmlhttp.send Parameters.toString
    response = xmlhttp.responseText
    set xmlhttp = nothing
  end function
  Private Sub Class_Initialize()
    Set Parameters = new wsParameters
  End Sub
  Private Sub Class_Terminate()
    Set Parameters = Nothing
  End Sub
End class
class wsParameters
  public mCol
  public function toString()
    dim nItem
    dim buffer
    buffer = ""
    for nItem = 1 to Count
      buffer = buffer & Item(nItem).toString & "&"
    next
    if right(buffer,1)="&" then
      buffer = left(buffer,len(buffer)-1)
    end if
    toString = buffer 
  end function
  public sub Clear
    set mcol = nothing 
    Set mCol = CreateObject("Scripting.Dictionary") 
  end sub
  public sub Add(pKey,pValue)
    dim newParameter
  
    set newParameter = new wsParameter
    newParameter.Key = pKey
    newParameter.Value = pValue
    mCol.Add mCol.count+1, newParameter
  
    set newParameter = nothing
  end sub
  public function Item(nKey)
    set Item=mCol.Item(nKey)
  end function
  public function ExistsXKey(pKey)
    dim nItem
  
    for nItem = 1 to mcol.count
      if mCol.Item(nItem).key = pKey then
        ExistsXKeyword = true
        exit for
      end if
    next
  end function
  public sub Remove(nKey)
    mCol.Remove(nKey)
  end sub
  public function Count()
    Count=mCol.count
  end function
  Private Sub Class_Initialize()
    Set mCol = CreateObject("Scripting.Dictionary")
  End Sub
  Private Sub Class_Terminate()
    Set mCol = Nothing
  End Sub
end class
class wsParameter
   public Key
   public Value
   public function toString()
     toString = Key & "=" & Value
   end function
end class
%>

I hope that this small code of my implementation can help you, thanks, and if any question please send me an email.