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It is important to use the peek method here because it leaves the QIODevice unaffected. When attempting to read an image, Qt can pass the same device to several plugins to determine which one to use. Listing 11-10. Peek at the device to determine whether the image looks right. bool TextImageHandler::canRead( QIODevice *device ) { if( device->peek(4) == "TEXT" ) return true; return false; } bool TextImageHandler::canRead() const { return TextImageHandler::canRead( device() ); }

The goal of non-repudiation is to ensure undeniability of a transaction by any of the parties involved. A trusted third party, such as Trent, can be used to accomplish this. For example, let us say Alice interacted with Bob at some point, and she does not want Bob to deny that she interacted with him. Alice wants to prove to some trusted third party (i.e., Trent) that she did communicate with Bob. If, for instance, Alice sent a payment for a bill to Bob over the Web, she may want her payment to be non-repudiable. That is, she does not want Bob to be able to deny that he received the payment at some later point for any reason. Alice, for example, may feel comfortable sending money to Trent, but not directly to Bob. Bob also trusts Trent. Trent may say to Bob, Yes, Alice gave me the $500, so you can ship her the goods, and then I will pay you. In such an example, Trent is playing the role of an escrow agent, but trusted third parties may be able to serve in many other types of trusted roles

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Issuing an HTTP redirect to the view() action is preferable to simply returning the page because if a user clicks Refresh, it is the view() action that is called again, not the create() action This avoids the possibility that the user will accidentally add two identical pages by mistake by resubmitting the form This can cause other problems; for example, how do you pass information obtained during the call to create() to the view() action called next Because the two pages are generated in two separate HTTP requests, you need to use a session to store information that can be used across the requests You ll learn about this later in the chapter This is a good point to test your new application If the server isn t already running, start it with the paster serve --reload developmentini command Visit http://localhost:5000/page/new, and you should see the form.

To build a plugin and install it so that Qt can find it takes more than just running qmake project. You can use it to create a starting point, but you have to modify the project file extensively. Listing 11-11 shows the project file for the ASCII art image format plugin. The HEADERS and SOURCES lines are just the same as for all Qt projects. The lines above them specify that you are building a template, while the lines below indicate where the plugin will be installed. Starting from the top, you set the TEMPLATE to lib, which tells QMake that you are building a library, not an application. The next line tells QMake the name of the plugin: textimage. Following is the CONFIG line, in which you specify that the lib will be used as a plugin and that it should be built in release mode (without debugging information). The last line in the top section is the VERSION line, which is used to tell different plugin versions apart. In this case, the resulting file is named textimage1. The last two lines set up an installation target, which configures the actions that are performed when you run make install. The first line of this section sets the path of the target to $$[QT_INSTALL_PLUGINS]/imageformats that is, the plugins/imageformats directory inside the Qt installation directory. The second line of this section and the last line of the project file tell Qt to install target when make install is run. It will copy the plugin file to the appropriate directory, making it possible for Qt to find it. Listing 11-11. The project file for the TextImagePlugin and TextImageHandler TEMPLATE = lib TARGET = textimage CONFIG += plugin release VERSION = 1.0.0

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