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Figure 12-7: The sample application displaying downloaded sales data in DataSet format. Accessing BinHex-Encoded Images Calling the GetSalesReportBarChart method is not all that different from calling the GetSalesReport method, but more work is needed to make the downloaded data usable. As mentioned, the GetSalesReportBarChart method draws a bar chart, converts it to JPEG, encodes the image as a BinHex string, and packs everything into an XML document. The content of the document is then returned as a string, as shown here: ServiceSalesProvider ssp = new ServiceSalesProvider(); string encImage = ssp.GetSalesReportBarChart(theYear); The next step is transforming the string into a bitmap and displaying it in the PictureBox control. The following procedure takes the BinHex image description and creates an equivalent Bitmap object. Because the string is an XML document, an XmlTextReader object is needed to parse the contents and then decode the BinHex data. private Bitmap EncodedXmlToBitmap(string encImage) { Bitmap bmp = null; // Parse the XML data using a string reader StringReader buf = new StringReader(encImage); XmlTextReader reader = new XmlTextReader(buf); reader.Read(); reader.MoveToContent(); // The root node of the document is <jpeg> if (reader.LocalName == "jpeg") { 450

Note Although we ve attempted to include only those resources that have stood the test of time, web-based resources are extremely volatile. We apologize in advance if any of these sites are no longer in operation when you try to access them.

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// Get the size of the BinHex data int encodedSize Convert.ToInt32(reader["Size"].ToString()); // Read and decode the BinHex data byte[] img = new byte[encodedSize]; reader.ReadBinHex(img, 0, encodedSize); // Transform the just read bytes into an Image object MemoryStream ms = new MemoryStream(); ms.Write(img, 0, img.Length); bmp = new Bitmap(ms); ms.Close(); reader.Close(); return bmp; } } You decode the image data using the ReadBinHex method on the XmlTextReader class. Next you copy the resultant array of bytes into a temporary memory stream. This step is necessary because a Bitmap object can't be created directly from an array of bytes. Finally, the returned Bitmap object is bound to the PictureBox control in the form, as shown in the following code: PictureContainer.SizeMode = PictureBoxSizeMode.StretchImage; PictureContainer.Image = bmp; Figure 12-8 shows the results. =

Figure 12-8: The sample application displaying an encoded bar chart. The client can easily create a local copy of the JPEG file. The following code snippet shows how to proceed: // img is the array of bytes obtained from ReadBinHex FileStream fs = new FileStream(fileName, FileMode.Create); 451

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When you re working on brochures and newsletters, you may want to print on both sides of the paper. Word provides features that will help you with duplex printing. If your printer does not have an automatic duplex feature, you can do it manually. Open the Print dialog box, shown in Figure 3-34, by clicking File Print. In the Print drop-down box, select Odd pages and then click OK to start printing. Once the odd pages have printed, put the pages back in your printer. Open the Print dialog box again and select Even pages in the Print drop-down box. You may have to experiment with your printer to get it right.

BinaryWriter writer = new BinaryWriter(fs); writer.Write(img); writer.Close();

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When converting a Bitmap object to JPEG, you can control the compression ratio to obtain a better image. However, JPEG is not a compression scheme designed for text and simple figures like bar charts. In fact, JPEG was originally designed to effectively compress photographic images. To ensure a better image, you might want to use the GIF format or control the compression ratio of the final JPEG image. You can do that by using one of the overloads of the Bitmap object's Save method.

Using the System.Activator Class A remoting client can obtain a proxy to make calls to a remote object in two ways: by using the new operator or by using methods of the System.Activator class. The Activator class provides two methods CreateInstance and GetObject. Clients of wellknown objects use GetObject, whereas clients of client-activated objects use CreateInstance. GetObject returns a proxy for the well-known type served at the specified URL location, as shown in the following code. GetObject is a wrapper placed around the global RemotingServices.Connect method. The proxy is built on the client from the remote object metadata and exposed to the client application as the original type. ServiceSalesProvider ssp; ssp = (ServiceSalesProvider) Activator.GetObject( typeof(ServiceSalesProvider), "http://www.contoso.com/SalesReport"); From this relatively simple explanation, it should be clear that .NET Remoting is no less quirky than DCOM, but unlike DCOM, the .NET Framework successfully hides a great wealth of low-level details. CreateInstance differs from GetObject in that it actually creates a new remote instance of the object, as shown here: // Set the URL of the remote object object[1] attribs; attribs[0] = new Activation.UrlAttribute(url); // Create the instance of the object ServiceSalesProvider ssp; ssp = (ServiceSalesProvider) Activator.CreateInstance( typeof(ServiceSalesProvider), null, attribs);

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The .NET Remoting system enables you to access .NET Framework objects across the boundaries of AppDomains. It represents the actual implementation of a programming 452

If you have a printer that does automatic duplex printing, open the Print dialog box. Click the Options button. In the Options for Duplex Printing section, shown in Figure 3-35, specify your printing options. Click OK. Then click OK in the Print dialog box to begin printing.

model designed for interprocess communication. Another facet of this model is .NET XML Web services. Although .NET XML Web services allow you to expose .NET Framework objects to any client that can use HTTP, .NET Remoting is optimized for .NET-to-.NET communication. Communication between the client and the remotable object can take place using SOAP or binary payloads transported over HTTP or TCP. .NET Remoting can transfer any serializable CLR types; it is not limited to XML Schema Definition (XSD) types or complex custom types as rendered by the .NET XML serializer. This chapter illustrated the key features of the .NET Remoting system and showed you how to set up a remotable object that exposes nontrivial functionalities. In particular, you learned how to expose JPEG images through XML documents. Of course, if the goal of your distributed system is simply to create and return dynamic images, .NET Remoting might not be for you. But from a broader standpoint that encompasses Web services, .NET Remoting not only makes sense, it is also compelling. The example we've constructed in this chapter has two aims. First, it demonstrates that .NET Remoting and Web services are just two remoting interfaces and that the same core class can outfit both. Second, it shows that to come up with truly efficient and effective code, you must always take the most appropriate route and create specialized code instead of pursuing the promises of code universality and platform independence. This chapter covered only the first side of remoting .NET Remoting for CLR types. In 13, we'll look at Web services a truly interoperable infrastructure ideal for rolling up your functionalities and making them available to a potentially infinite set of clients.

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