Creating Web Services in .NET

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<!DOCTYPE HTML PUBLIC -//W3C//DTD HTML 4.0 Transitional//EN > <HTML> <HEAD> <title>WebForm1</title> <meta name= GENERATOR content= Microsoft Visual Studio.NET 7.0 > <meta name= CODE_LANGUAGE content= Visual Basic 7.0 > <meta name= vs_defaultClientScript content= JavaScript > <meta name= vs_targetSchema content= http://schemas.microsoft.com/intellisense/ie5 > </HEAD> <body> <form name= Form1 method= post action= WebForm1.aspx id= Form1 > <input type= hidden name= __VIEWSTATE value= dDw5OTg1NjA2Ozs+Hi6x4gaAuIZHihy9reVYgBFyY6E= /> <P align= center > <img id= Image1 src= http://teachatechie.com/GJTTVBWebServices/ImageURL.aspx ImageID= 9ef3e7522f0a48e7937e68b110953dc4 border= 0 /> </P> <P align= center >Welcome to my home page.</P> <P> </P> </form> </body> </HTML>
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Figure 16.10 The browser output, showing the custom heading created by calling the RenderText method.
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Notice that the Image control became an HTML img tag, and src contains the URL to the image (View State was disabled on the Image control).
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In the next example, DropDownList controls are added to allow the user to select a value for each of the parameters required by the RenderText method. A call could be made to LoadColors, LoadFontStyles, LoadFontFamily, and LoadFontSizes, but another method, called LoadSettings, returns a DataSet that is populated with a table for each of the settings. Figure 16.11 shows the modified page with DropDownList controls for each of the settings and a Render button and added Image control. The following code has been added to retrieve the settings and display a new image into a second image control:
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Public Class WebForm1 Inherits System.Web.UI.Page Protected WithEvents drpFont As _ System.Web.UI.WebControls.DropDownList Protected WithEvents drpSize As _ System.Web.UI.WebControls.DropDownList Protected WithEvents drpStyle As _ System.Web.UI.WebControls.DropDownList Protected WithEvents Image2 As System.Web.UI.WebControls.Image Protected WithEvents drpForeground As _ System.Web.UI.WebControls.DropDownList Protected WithEvents drpBackground As _ System.Web.UI.WebControls.DropDownList Protected WithEvents txtText As System.Web.UI.WebControls.TextBox Protected WithEvents btnRender As System.Web.UI.WebControls.Button Protected WithEvents Image1 As System.Web.UI.WebControls.Image Dim ti As TextImaging.TextToImage Private Sub Page_Load( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load ti = New TextImaging.TextToImage() Image1.ImageUrl = ti.RenderText( Regular , _ 36 , Impact , My Home Page , LightBlue , Blue ) If Not Page.IsPostBack() Then Dim ds As DataSet If Cache( FontSettings ) Is Nothing Then ds = ti.LoadSettings() Cache( FontSettings ) = ds Else ds = CType(Cache( FontSettings ), DataSet) End If drpFont.DataSource = ds drpFont.DataMember = FontFamily
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drpFont.DataTextField = FontName drpStyle.DataSource = ds drpStyle.DataMember = FontStyles drpStyle.DataTextField = StyleName drpSize.DataSource = ds drpSize.DataMember = FontSizes drpSize.DataTextField = Size drpBackground.DataSource = ds drpBackground.DataMember = Colors drpBackground.DataTextField = ColorName drpForeground.DataSource = ds drpForeground.DataMember = Colors drpForeground.DataTextField = ColorName DataBind() End If End Sub Private Sub btnRender_Click( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles btnRender.Click Image2.ImageUrl = ti.RenderText( _ drpStyle.SelectedItem.Text, _ drpSize.SelectedItem.Text, _ drpFont.SelectedItem.Text, _ txtText.Text, _ drpBackground.SelectedItem.Text, _ drpForeground.SelectedItem.Text) End Sub End Class
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Figure 16.11 The revised Web page with added controls.
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This code still displays the heading on the page, but also checks to see if the page has been posted back. If this is the first visit to the page, the DropDownList controls must be populated. A call is made to the LoadSettings method only if the DataSet is not in the cache. The balance of the Page_Load method is dedicated to assigning the DataSet to the DropDownList controls. The btnRender method simply calls the RenderText method using the settings from the DropDownList controls. The returned URL is placed into the second Image control s ImageURL.
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The proxy class that has been created also contains settings that may need to be modified. This section addresses some of the most common settings.
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The proxy class has a Credentials property that can be used when the Web service requires authentication using Internet Information Server Basic or Windows authentication. A new instance of the System.Net.NetworkCredential class can be assigned to the Credentials property before the call is made to any method, as shown:
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Imports System.Net ti = New TextImaging.TextToImage() ti.Credentials = New NetworkCredential( Glenn , password )
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The URL property contains the location of the Web service. This can be changed in the code if the Web service location changes.
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