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Using files on different platforms usually means trouble. The incompatibilities are found on all levels: file names, directory paths, line breaks, endianess, and so on. You can avoid problems with paths, drives, and file names by using the QDir and QFileInfo classes. After you locate a file, you can open it by using QFile. Qt has streams to read and write data. If you use the QTextStream class, you can handle text files with ease; if you use the QDataStream class, it is easy to serialize and read back your data from binary files. Just think about the potential stream-versioning problem. Even if you use the same Qt versions for all your application deployments, you will get more versions in the future. A simple setVersion call can save days of frustration. One alternative to storing your data as text or in a custom binary format is to use XML. Qt enables you to use DOM, which allows you to read an entire XML document into memory, modify it, and then write it back to a file. If you want to read an XML file without having to load it all at once, you can use Qt s SAX classes. When you use XML, you need to add the line QT += xml to your project file because the XML support is implemented in a separate module. This module is not included in all editions of Qt, so verify that you have access to it before trying to use it. Finally, you saw the missing piece of the SDI application. Adding the methods covered in the final section of this chapter makes it easy to build applications that support file loading and saving.

You ll use SQLAlchemy to store the individual pages in the site in such a way that users can add, edit, or remove them so that the application behaves like a simple wiki Each of the pages will also support comments and tags, so you can use some of the knowledge gained in the previous chapter to help you create the application You ll also use FormEncode and HTML Fill to handle the forms Later in the book you ll return to SimpleSite and add authentication and authorization facilities, and you ll add a navigation hierarchy so that pages can be grouped into sections at different URLs You ll implement some JavaScript to animate messages and use some Ajax to populate one of the form fields.

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A digital signature scheme supports two major operations: Sign(M,ks(P)) and Verify(M,sig,P), where M is a message, sig is a signature, P is the name of a principal, and ks(P) is that principal s secret key A signature is a sequence of bits produced by the Sign() operation, and it has the property that Verify(M,sig,P) is true if and only if sig = Sign(M,ks(P)) is true (and is false otherwise, with overwhelmingly high probability) A signature is a non-repudiable piece of evidence that a principal who has possession of key ks(P) executed the Sign() operation on message M Depending upon the specific context, the signature can have different semantics For example, M could be an electronic check that states that I, Alice, agree to pay you, Bob, $10 from my bank account with number 103842749476.

ometimes users need a helping hand. With Qt you can give them the instruction they re looking for in a variety of ways: wizards, tooltips, status bar messages, and pointers to product documentation, to name a few. When considering how to add help-related features to your application, keep in mind that there s much more to it than simply responding to the F1 key (the de facto mechanism for displaying the application s help window). Assistance is most effective when it s an integral yet nonintrusive part of your entire application. By using a good design that clearly reflects both what users are currently doing and where in the process they are, you can dramatically reduce the need for help. Some of the tools and principles include providing wizards for complex settings, avoiding or clearly indicating different working modes such as insert and overwrite, and alerting users when they re about to do something that can destroy a lot of information. Providing lots and lots of help does not make it easy to use an application; too much help can just make it hard to find the information that the user is looking for. What you need to achieve is an easy-to-use whole: a combination of relevant help and a clear design. This is what makes using your application a joy.

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