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Both the reading and writing cases are shown in Figure 11-2. The figure also shows what part is Qt and what part is the plugin. The shown scenario is commonly used with Qt plugins. One is queried for what the plugin has to offer and then returns instances that perform the actual tasks. In the case of image plugins, the QImageIOPlugin is queried and returns a QImageIOHandler.

When the first experiments were taking place with dynamically generated web pages, developers would write an external program and have their web server run the program every time a matching HTTP request arrived This resembled the behavior of the traditional inetd server ( 7), which could run an external command to answer each incoming TCP or UDP connection on a listening socket Many of these early web servers lacked the ability to designate entire sections of a web site as dynamic; for example, you could not tell them, all URLs beneath /cart should be handled by my application Instead, scripts were simply designated as a new type of content, and then placed right next to static pages, images, and archive files in directories that were already browsable from the web Just as servers had been told that html files should be delivered as text/html content and that .

Now you re ready to have a look at the ASCII art image plugin that can handle text images; the format is called ti. You ll also tell Qt to use ti as the preferred file extension for these text images. The TextImagePlugin class inherits from the QImageIOPlugin class, while the TextImageHandler inherits the QImageIOHandler class (nothing else is in the plugin). Let s start looking at the code, beginning with the class declaration of the TextImagePlugin in Listing 11-1. The interface consists of three methods: keys, capabilities, and create. The keys method returns a QStringList of the image formats that the plugin supports. The capabilities method takes a QIODevice and an image format as arguments and then returns a value indicating whether the plugin CanRead or CanWrite the specified format to or from the given device. The last method, create, creates a QImageIOHandler for a given device and format.

is supported. This means that it reads the image in several passes, making it possible to show the image gradually. The ASCII art image plugin never attempts to implement it.

jpg files should be returned as images, they were now told that executable cgi files should be run and their output returned to the HTTP client Obviously, a calling convention was necessary, and so the Common Gateway Interface (CGI) was defined It allowed programs in all sorts of languages C, the various Unix shells, awk, Perl, Python, PHP, and so forth to be partners in generating dynamic content Today, the design of CGI is considered something of a disaster Running a new process from scratch is just about the most expensive single operation that you can perform on a modern operating system, and requiring that this take place for every single incoming HTTP request is simply madness You should avoid CGI under all circumstances.

var resultXML = environment.getXml(reqUrl, "technorati"); var resultArray = new Array(); if(resultXML.getElementsByTagName("channel").length >= 1) { var errorCheck resultXML.getElementsByTagName("channel")[0]. getElementsByTagName("description")[0].text; errorLength = errorCheck.indexOf('Error'); if(!resultXML) { throw "Sorry, the Technorati block encountered a problem which it could not solve."; } if(errorLength != -1) {

Listing 11-1. The class declaration of the image IO plugin class TextImagePlugin : public QImageIOPlugin { public: TextImagePlugin(); ~TextImagePlugin(); QStringList keys() const; Capabilities capabilities( QIODevice *device, const QByteArray &format ) const; QImageIOHandler *create( QIODevice *device, const QByteArray &format = QByteArray() ) const; }; The most interesting of the methods is capabilities (shown in Listing 11-2), which determines what the plugin can do for a given format or device. This means that the format QByteArray must either contain the string ti or be empty for the plugin to be able to do anything with it. If the format QByteArray is empty, you must peek at the QIODevice. If it is open and writeable, you can always write to it. If it is readable, and the plugin can read from it (more about the static canRead method later on), you can read from it. It is important not to affect the device in any way (ensure that you are just peeking; not actually reading, writing, or seeking).

But it is possible you might someday have to connect Python code to a legacy HTTP server that does not support at least FastCGI or SCGI, so I will outline CGI's essential features Three standard lines of communication that already existed between parent and child processes on Unix systems were used by web servers when invoking a CGI script:.

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