c# generate data matrix code Accessing Your HTML5 Content from the Local File System in C#.NET

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Accessing Your HTML5 Content from the Local File System
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The simplest way to create a hybrid application of this type is to write a thin Qt application using QWebView to render HTML5 content stored on the device in the local file system. Let s take a look at how to do this with our hworld example. Our Qt application is called hybridshell and is available from www.apress.com for download. This app doesn t do much more than open a QWebView and display some content. The difference is that this time the URL points to content on the local file
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CHAPTER 7: Developing with HTML5
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system rather than an http server on the network. To do this on Meego, for example, we use the command:
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url=QUrl().fromLocalFile("/usr/local/share/web/hworld.html");
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On Windows we probably want to put the content somewhere else that does not use an absolute file path. On Windows we would use this command:
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dir.setPath("../hybridshell/hworld.html"); url=QUrl().fromLocalFile(dir.canonicalPath());
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Just make sure that the file or files you are accessing are deployed to the device at the same time that you deploy your application binary. A convenient way to do this is to use the DEPLOYMENT variable in your .pro file. This is described in detail in 9. NOTE: At the time of this writing the deployment variable specified in the .pro file does not work correctly for Maemo when building with Qt Creator. To work around this, select the build project configurations for Maemo. Under Build Steps, select the Details tab for the Create Package section. When the details pane is expanded, you will see a Files to deploy block. Here you can select files from your local file system and specify to where they should be copied on your remote device file system. This is a convenient place to specify your web content files. There is one last thing we need to do. Many applications will need to access content on the network in addition to the content stored on the local file system. For example, in the Shake application that we present at the end of this chapter, we need to make an XmlHttpRequest call to download the earthquake feed data. By default, the QtWebKit security policy will block these requests. We need to explicitly enable this functionality by setting the LocalContentCanAccessRemoteUrls property to true like this:
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QWebSettings *GlobalSettings = QWebSettings::globalSettings(); GlobalSettings->setAttribute(QWebSettings::LocalContentCanAccessRemoteUrls, true);
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Run the application and there it is our web content appears just like a web page, but now everything is local to the device. There is one last technique we should look at for building hybrid web applications: packaging the content as a resource in the application binary.
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Storing the HTML5 Content as an Application Resource
Packaging files for the local storage system is nice, but it has the problem that you need to explicitly manage the placement of these files. Each platform needs the files placed in a slightly different location. An easier way to handle this problem is to include our content as an application resource. Qt allows us to access a .qrc file just as simply as accessing content from elsewhere. Just use qrc: rather than http: to indicate your HTML content is accessed from a resource. For our sample application we just make this substitution:
url=QUrl("qrc:/hworld.html");
CHAPTER 7: Developing with HTML5
Make sure to use Qt Creator to include your web content as application resources. Now, the content is bundled into your application binary. Management is much easier since we don t have to worry about moving around a bunch of external files. Be careful, though, too much web content stored as a resource will bloat the size of your application binary. In this section we ve shown how to use Qt to render HTML5 content using four different methods: a QtWebKit based browser that loads content off the net in the traditional manner, a QtWebKit browser that uses the HTML5 application cache to enable that same hosted application to be available without network connectivity, a hybrid app where the content is stored locally on the device file system, and a hybrid app where the content is bundled as a resource into the application binary. In the next section we will take a more in-depth look at some of the new features in HTML5. NOTE: One last option for developing web applications is the Symbian Web Runtime. This is a Nokia proprietary technology where web files such as HTML, JavaScript, and CSS can be bundled into an archive package file and installed and run on the device like a native application. It is similar to the W3C widget standard defined here: www.w3.org/TR/2009/CR-widgets20090723/. The Symbian Web Runtime will be supported on the Symbian platform for legacy applications, but is not the recommended development path moving forward.
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