datamatrix net documentation BUILDING SMART WEB APPLICATIONS in Visual Basic .NET

Encoder DataMatrix in Visual Basic .NET BUILDING SMART WEB APPLICATIONS

CHAPTER 14 BUILDING SMART WEB APPLICATIONS
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Deploying and Running the Application
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Figure 14-1 shows the simple web application from Listing 14-2 accessed via a web browser on the local machine. You can deploy and run web applications like this in three ways. You can create an ASP.NET project inside Visual Studio, add the Time.aspx file to the project, and adjust the web.config file in the project to contain the given compiler entry. Visual Studio comes with its own built-in web server so that when you run the web application using F5 from inside Visual Studio, a browser is automatically opened with a reference to this web server. You can deploy the application to your local web server. For example, copy Time.aspx and web.config to an application directory in an ASP.NET-enabled web server. When using IIS, you can copy them to a directory inside your default web root such as c:\inetpub\wwwroot\Time and reference the web site via http://localhost/Time/Time.aspx, or you can set up IIS virtual directories and copy to their corresponding folders. Ensure that your web server is ASP.NETenabled as described later in the sidebar Serving ASP.NET Pages Locally. You can deploy the files to a live web server. Again, copy Time.aspx and web.config to an application directory in an ASP.NET-enabled web server. Ensure that the F# compiler has been installed on the web server, or deploy the F# binaries as part of the bin directory of your web application.
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Figure 14-1 shows the results of launching the application via the second technique.
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Figure 14-1. The simple web application from Listing 14-1
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CHAPTER 14 BUILDING SMART WEB APPLICATIONS
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You need to enable a number of configuration settings in order to ensure that you can use your local machine as an experimental development web server. When using Visual Studio, by far the easiest way to get going with developing web applications is to use the local web server built into Visual Studio, which is invoked when you run ASP.NET projects using F5. This starts the built-in web server using a random port and opens the default page by constructing a URL such as http://localhost:59120/Time/time.aspx. Another option is using Microsoft s IIS web server; you can deploy web applications under separate folders in the main web root folder for instance, c:\inetpub\wwwroot\Time and these can then be accessed via URLs such as http://localhost/Time/time.aspx. Here are some tips for doing this: Ensure that ASP.NET support is enabled in IIS. On Windows 7, you do so using Control Panel Programs Programs and Features Turn Windows features on or off. Be sure the check box at Internet Information Services World Wide Web Services Application Development Features ASP.NET is selected. Ensure that the default web root folder c:\inetpub\wwwroot exists and that you ve copied your .aspx and web.config files to that directory. Ensure that the web.config file contains an entry for the F# compiler, as shown in Listing 14-3. If not, ASP.NET can t invoke the compiler dynamically. This is automatically done if you use the F# Website project type. Check that you can access other local URLs such as http://localhost/iisstart.htm, the default starting page for IIS. If not, check the settings for IIS under Control Panel Administrative Tools Internet Information Services (IIS) Manager. Add a debug entry to your web.config file, as shown in Listing 14-3, to ensure that verbose debugging information is generated for your F# code. Otherwise, errors reported by ASP.NET will be difficult to diagnose.
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A number of application settings are relevant to web applications, but most of them are beyond the scope of this book. The easiest way to get some guidance is to look at the web.config.comments file. For Microsoft .NET, you can find this file in your Windows directory and the Microsoft.Net\Framework\{your .NET version}\CONFIG folder within. This same directory also contains a configuration file called machine.config, which has settings that apply to all web applications on the host machine. Many of the common, default settings are stored in this file.
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Listing 14-3. web.config: An ASP.NET Web Site Configuration File for Listing 14-2 < xml version="1.0" > <configuration> <system.web> <compilation debug="true" /> </system.web>
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