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Asking Qt for the image formats that can be read QApplication app( argc, argv ); foreach( QByteArray ba, QImageReader::supportedImageFormats () ) qDebug() << ba; When reading, Qt usually determines the file format by querying the plugin s capabilities methods This generates a call to the different canRead methods that determine whether the specific plugin can handle the given file (The application just needs to specify the file name; Qt does the rest of the work) As shown in Listing 11-13, the resulting QImage is a null image if the loading fails If you use the load method of QImage, you can get the return value from it The method returns true if the image is loaded; it returns false if it fails Listing 11-13 Reading an ASCII art image QImage input( "inputti" ); if( inputisNull() ) qDebug() << "Failed to load.

Unfortunately, while non-repudiation protocols sound desirable in theory, they end up being very expensive to implement, and are not used often in practice..

Now that you ve implemented the code to create new pages, let s look at the very similar code required to edit them. Once again, you ll have an action to display the form (in this case edit()) and an action to handle saving the code (in this case save()). The edit() action will need to load the data for the page from the model and then populate the form with the page information. Here s what it looks like: def edit(self, id=None): if id is None: abort(404) page_q = meta.Session.query(model.Page) page = page_q.filter_by(id=id).first() if page is None: abort(404) values = { 'title': page.title, 'heading': page.heading, 'content': page.content } return htmlfill.render(render('/derived/page/edit.html'), values)

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"; The opposite of reading saving is slightly more complex Because there is no file prefix to look for, you need to specify the file format when calling save (see Listing 11-14) In the listing, a png image is read from disk If the read is successful, the image is saved again as a ti image The save call returns a bool value, which indicates whether the operation was successful The value true means that it worked..

Notice how this example uses FormEncode s htmlfill module to populate the form fields with the values obtained from the page object. The call to render('/derived/page/edit.html') generates the HTML, and the call to htmlfill.render() populates the values. The /derived/page/edit.html template can also use the same fields you used in the new.html template. It looks very similar: <%inherit file="/base/index.html" /> <%namespace file="fields.html" name="fields" import="*"/> <%def name="heading()"> <h1 class="main">Editing ${c.title}</h1> </%def> <p>Editing the source code for the ${c.title} page:</p> ${h.form_start(h.url_for(controller='page', action='save', id=request.urlvars['id']), method="post")} ${fields.body()} ${h.field(field=h.submit(value="Save Changes", name='submit'))} ${h.form_end()} The only difference is that the form action points to save instead of new. The save() action is also slightly different from the create() action because it has to update attributes on an existing page object. Here s how it looks: @restrict('POST') @validate(schema=NewPageForm(), form='edit') def save(self, id=None): page_q = meta.Session.query(model.Page) page = page_q.filter_by(id=id).first() if page is None: abort(404) for k,v in self.form_result.items(): if getattr(page, k) != v: setattr(page, k, v) meta.Session.commit() # Issue an HTTP redirect response.status_int = 302 response.headers['location'] = h.url_for(controller='page', action='view', id=page.id) return "Moved temporarily" Notice how this time attributes of the page are set only if they have changed. Remember when using FormEncode in this way, when the form is valid, the converted results get saved as the self.form_result dictionary, so you should get the submitted content from there rather than from request.params. Also, in this instance, the FormEncode schema for creating a new page is the same as the one needed for editing a page, so you are using NewSchemaForm again in the @validate decorator. Often you will need to use a second schema, though. Why not try editing a page For example, to edit the home page, you could visit http:// localhost:5000/page/edit/1.

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