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Listing 12-38. The user interface handling part of the TextDialog TextDialog::TextDialog() : QDialog() { ui.setupUi( this ); connect( ui.buttonBox, SIGNAL(clicked(QAbstractButton*)), this, SLOT(buttonClicked(QAbstractButton*)) ); count = 0; } void TextDialog::buttonClicked( QAbstractButton *button ) { if( ui.buttonBox->buttonRole( button ) == QDialogButtonBox::ResetRole ) ui.listWidget->clear(); } The remaining part of the TextDialog class implementation is the showText slot. It can be seen in Listing 12-39 and is almost identical to the write slot of the TextDevice class shown in Listing 12-34. All this shows is that there is no difference in communicating between two QThread objects and communicating between QThread objects and the main thread. The same rules apply, and the same limitations still exist. Listing 12-39. The showText slot of the TextDialog void TextDialog::showText( TextAndNumber tan ) { QMutexLocker locker( &mutex ); ui.listWidget->addItem( QString( "Call %1 (%3): %2" ) .arg( count++ ) .arg( tan.text ) .arg( tan.number ) ); } The main function starting the threads and showing the dialog has not changed much from Listing 12-33, except that the TextDevice has been replaced by a TextDialog. The dialog is now started as a thread but shown before QApplication::exec is started. When that call returns, the TextThread threads are stopped and waited for before the return value from the exec call is returned. The application can be seen in action in Figure 12-2. Notice that you can move up and down in the list widget and clear it independently of the two threads; they will keep on adding items in parallel with anything that happens in the main thread.

The Python language has built-in support for help messages via the help() function. The best way to see how it works is to load an interactive Python prompt and test it. Let s try to get help on the integer 1: >>> help(1) Help on int object: class int(object) | int(x[, base]) -> integer | | Convert a string or number to an integer, if possible. A floating point | argument will be truncated towards zero (this does not include a string | representation of a floating point number!) When converting a string, use | the optional base. It is an error to supply a base when converting a | non-string. If the argument is outside the integer range a long object | will be returned instead. | | Methods defined here: | | __abs__(...) | x.__abs__() <==> abs(x) | | __add__(...) | x.__add__(y) <==> x+y | | __and__(...) | x.__and__(y) <==> x&y | As you can see, detailed help on the behavior of Python integers is returned (I ve shown only the first few lines for brevity). The information help() displays comes from a combination of introspection of the object passed to it and any docstrings associated with the object itself or any related objects. For help() to work effectively, you need to write good docstrings. The help() function will reformat docstrings to remove whitespace and allow them to be better displayed on the command line. If you look at the example in the previous section, you ll notice that t

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For instance, a web server may have an option that, when turned on, allows it to serve content from a database; or when turned off, only allows it to serve files from its local file system Administrators must ensure that their web servers are configured correctly, so as to minimize the possible methods of attack By restricting a web server to only serve files from its local file system, you prevent an attacker from taking advantage of vulnerabilities in how a web server uses a back-end database It is possible for a malicious user to trick a web server into sending user-submitted data to the database as a command, and thereby take control of the database (One example of such an attack is a SQL injection attack we cover such attacks in 8.

A close relative to the thread is the process, which can consist of several threads, but does not share memory and resources in the same intimate way that a thread does. Threads belonging to a single process share memory and resources and are all part of the same application. A process is what you usually refer to as another application. It has its own memory and resources and lives a life of its own. Qt handles processes through the QProcess class. If you start a process from your application, you communicate with it via channels (known as standard input, standard output, and standard error channels). These are the channels that are available to console applications, and the data is limited to streams of bytes.

The whole Python standard library makes extensive use of docstrings as does Pylons. In fact, all the API documentation for Pylons is currently generated directly from docstrings using a tool called Sphinx, which you ll learn about later in the chapter. Here is an example of the first few lines of output you ll see if you use the help() function on the pylons module: >>> import pylons >>> help(pylons) Help on package pylons: NAME pylons - Base objects to be exported for use in Controllers FILE /Users/james/pylons-dev/pylons/__init__.py PACKAGE CONTENTS commands config configuration controllers (package) database decorator decorators (package) error helpers i18n (package) legacy log middleware templates (package) templating test testutil util wsgiapp Documentation generated by help() is very useful at the Python console but less useful if you are coding an application. Luckily, the same docstrings can also be used to generate browseable documentation in HTML.

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