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We can now update the imageAction() method to look for the w, h, and hash parameters so a thumbnail can be served if required. We simply need to generate a new hash based on the id, w, and h parameters, and then compare it to the hash value in the URL. Once we have determined that the supplied hash is valid and that the image could be loaded, we continue on by generating the thumbnail and sending it. Instead of calling getFullPath(), we will call createThumbnail(), which returns the full path to the generated thumbnail. Since createThumbnail() throws various exceptions, we will call getFullPath() as a fallback. In other words, if the thumbnail creation fails for some reason, the original image is displayed instead. You may prefer instead to output an error. The other code in imageAction() operated on the returned path from getFullPath(), so we don t need to change any of it createThumbnail() also returns a full filesystem path. Listing 11-29 shows the new version of imageAction(), which belongs in the UtilityController.php file in ./include/Controllers. Listing 11-29. Modifying imageAction() to Output Thumbnails on Demand (UtilityController.php) < php class UtilityController extends CustomControllerAction { // ... other code public function imageAction() { $request = $this->getRequest(); $response = $this->getResponse(); $id = $w = $h = $hash (int) $request->getQuery('id'); (int) $request->getQuery('w'); (int) $request->getQuery('h'); = $request->getQuery('hash');

Division can sometimes cause confusion in C#. If you divide one integer by another integer, C# performs integer division. That means it automatically discards the fractional part of the answer and returns the whole part as an integer. For example, if you divide 5 by 2, you ll end up with 2 instead of 2.5. The solution is to explicitly indicate that one of your numbers is a fractional value. For example, if you replace 5 with 5M, C# will treat the 5 as a decimal. If you replace 5 with 5.0, C# will treat it as a double. Either way, the division will return the expected value of 2.5. Of course, this problem doesn t occur very often in real-world code, because then you re usually dividing one variable by another. As long as your variables aren t integers, it doesn t matter what number they contain. The operators in Table 2-2 are designed for manipulating numbers. However, C# also allows you to use the addition operator (+) to join two strings: // Join three strings together. myName = firstName + " " + lastName; In addition, C# also provides special shorthand assignment operators. Here are a few examples: // Add 10 to myValue. This is the same as myValue = myValue + 10; myValue += 10; // Multiple myValue by 3. This is the same as myValue = myValue * 3; myValue *= 3; // Divide myValue by 12. This is the same as myValue = myValue / 12; myValue /= 12;

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In order to tidy up the user interface when using the GridView and DetailsView, you ve resorted to a little bit of trickery. You no longer let the DetailsView decide when to show a link to add a new Player. Instead, you add your own link. In order to do this, you need to manually tell the DetailsView that it is inserting a new Player. In previous examples, the DetailsView switched itself into Insert mode when you clicked the New link. As you don t have this link here, you need to do this manually: protected void LinkButton1_Click(object sender, EventArgs e) { DetailsView1.ChangeMode(DetailsViewMode.Insert); } So when the user clicks the Add New Player link, the Click event handler is executed, and the ChangeMode method of the DetailsView is used to switch into Insert mode. Once you switch into Insert mode, the DetailsView will remain in that mode until it s told to be in a different mode. If you clicked a Select link, the DetailsView would still be in Insert mode, not in ReadOnly mode, as you would expect. So, when a Select link is clicked, you need to switch the DetailsView back into ReadOnly mode. When a row is selected in the GridView, not only does the SelectedValue property get set correctly, but also the SelectedIndexChanged event is fired. You can use this event handler to switch back to ReadOnly mode: protected void GridView1_SelectedIndexChanged(object sender, EventArgs e) { DetailsView1.ChangeMode(DetailsViewMode.ReadOnly); } You can change the mode of the Web control in the event handlers, as the GridView and DetailsView will be automatically data-bound after the OnPreRender event has fired. Userrequested events are fired before you get to this stage, so you re free to change the status of the

$realHash = DatabaseObject_BlogPostImage::GetImageHash($id, $w, $h); // disable autorendering since we're outputting an image $this->_helper->viewRenderer->setNoRender(); $image = new DatabaseObject_BlogPostImage($this->db); if ($hash != $realHash || !$image->load($id)) {

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