.NET/Java PDF, Tiff, Barcode SDK Library

more data files The connection between these data files and the application is handled using the MimeType entry that defines the mime type; that is, the file type that the application handles The last line, Icon, tells you which icon to use The easiest way is to specify an absolute path to the icon If you specify only the file name, you must determine where to store the icon file so that the desktop environment can find it When installing applications on Unix, it is common to support the make target install, which enables the user to type make install to copy the application files to a global location This is supported by QMake using install sets An install set is a QMake variable with three subvalues: path, files, and extra Let s look at an example.

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If your application s customers don t all work for your company, life becomes more complex, because it s harder to force upgrades on your customers It s not impossible for example, Microsoft s Windows Live Messenger program occasionally tells you that if you don t upgrade you won t be able to carry on using the service Mind you, it s a free service, so it gets to dictate its terms of use; you might find that paying customers won t put up with that, insisting that the product they ve bought carries on working without needing to install regular upgrades The implication is that you might need to support old versions of your service indefinitely At this point, WCF might not look like such a good choice.

One of the attractive features of WCF is that it does a lot of work for you under the covers, but that s a double-edged sword it works really well when both ends of the connection evolve simultaneously, but it can become a burden over time if the two ends do not move forward in tandem If you want a service to be able to evolve while the client does not, you end up needing to understand exactly how WCF presents your service, and how the changes you have in mind might affect its operation.

For example, if you decide that a method in your service requires an extra argument, what happens when an old client invokes the operation without that new argument In practice, it might actually be easier just to work directly with HTTP and XML, because that way you have complete control over what messages go across the network That s not to say that WCF is definitely the wrong choice here You could deal with the problem described by maintaining multiple versions of the service, or by dropping down to WCF s lower-level messaging API, for example But the trade-off between WCF and HTTP is altered by the nature of your deployment In a tightly controlled deployment, WCF is likely to be a good choice, but when you have less control, the lower-level APIs can start to look like they re worth the extra effort.

strURI.Append("&d=1&e=22&f=2006&g=d&a=8&b=28&c=1989&ignore=.csv"); Stream data = client.OpenRead(strURI.ToString()); StreamReader reader = new StreamReader(data); string s = reader.ReadToEnd(); DataTable theTable = CsvParser.Parse(s); if (nDays > 0) { int i = nDays + 1; while (theTable.Rows.Count > i) { theTable.Rows.RemoveAt(i); } } data.Close(); reader.Close(); return theTable; } This makes the connection to the Yahoo server by using an object derived from the WebClient class. To use this, you use its OpenRead method, which is pointed at a URI. This returns a stream, which can be read by a StreamReader. The contents of this can be parsed into a string using a CsvParser abstract helper class. This helper class provides the parsing functionality that reads the CSV information and returns it as a DataTable. The download for this book includes a version of this class that was derived from one published in the excellent blog from Andreas Knab at http://knab.ws/blog/. The call to the Yahoo iFinance server provides the entire price history for the stock, which can be thousands of days worth of information. It provides an additional layer that allows you to crop this data to the specified number of days. It does this by iterating through the DataTable and removing rows beyond what you are interested in. So if you want to pull 100 days worth of data, you remove all rows beyond number 100. That s about it. This web method is present in a web service called DataTier.

Regardless of how much control you have over deployment, as with the web application case there are some specialized scenarios in which neither WCF-based web services nor web APIs are the best fit If you need communication patterns that don t fit well with HTTP, be aware that with this style of application, you can use the full range of communication styles offered by WCF as we ll see, it supports more than just the typical web communication patterns This means that sockets are an even more unusual choice in this scenario, and would typically be useful only if you need very precise control over the way in which messages are constructed and delivered..