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When you use this technique to embed dynamic graphics in web pages, you also need to think about how the web page can send information to the code that generates the dynamic graphic For example, what if you don t want to show a fixed piece of text but you want to generate a dynamic label that incorporates the name of the current user (In fact, if you do want to show a static piece of text, it s probably better to create the graphic ahead of time and store it in a file, rather than generating it using GDI+ code each time the user requests the page) One solution is to pass the information using the query string The page that renders the graphic can then check for the query string information it needs.

The following example uses this technique to create a data-bound list that shows a thumbnail of every bitmap in a given directory Figure 30-9 shows the final result This page needs to be designed in two parts: the page that contains the GridView and the page that dynamically renders a single thumbnail The GridView page will call the thumbnail page multiple times (using <img> tags) to fill the list It makes sense to design the page that creates the thumbnail first To make this component as generic as possible, you shouldn t hard-code any information about the directory to use or the size of a thumbnail Instead, this information will be retrieved through three query string arguments The first step that you need to perform is to check that all this information is supplied when the page first loads, as shown here: protected void Page_Load(object sender, System.

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Notice that the class wasn t instantiated at any time; the simple act of creating the class triggered execution of the metaclass. Notice in the list of attributes: this attribute is a standard part of all Python classes. While this example uses the method to perform special processing on the newly created class, there is another, somewhat more powerful method called , with the potential for a different set of possibilities. As described in later chapters, Django uses when configuring many of its classes.

EventArgs e) { if ((RequestQueryString["X"] == null) || (RequestQueryString["Y"] == null) || (RequestQueryString["FilePath"] == null)) { // There is missing data, so don't display anything // Other options include choosing reasonable defaults // or returning an image with some static error text } else { int x = Int32Parse(RequestQueryString["X"]); int y = Int32Parse(RequestQueryString["Y"]); string file = ServerUrlDecode(RequestQueryString["FilePath"]); ....

Figure 30-9. A data-bound thumbnail list Once you have the basic set of data, you can create your Bitmap and Graphics objects as always. In this case, the Bitmap dimensions should correspond to the size of the thumbnail, because you don t want to add any additional content: ... // Create the in-memory bitmap where you will draw the image. Bitmap image = new Bitmap(x, y); Graphics g = Graphics.FromImage(image); ... Creating the thumbnail is easy. All you need to do is load the image (using the static Image.FromFile() method) and then draw it on the drawing surface. When you draw the image, you specify the starting point, (0, 0), and the height and width. The height and width correspond to the size of the Bitmap object. The Graphics class will automatically scale your image to fit these dimensions, using antialiasing to create a high-quality thumbnail: ... // Load the file data. System.Drawing.Image thumbnail = System.Drawing.Image.FromFile(file);

// Draw the thumbnail gDrawImage(thumbnail, 0, 0, x, y); .. Lastly, you can render the image and clean up, as follows: .. // Render the image imageSave(ResponseOutputStream, ImageFormatJpeg); gDispose(); imageDispose(); } } The next step is to use this page (named ThumbnailVieweraspx) in the page that contains the GridView The basic idea is that the user will enter a directory path and click the submit button At this point, your code can perform a little work with the SystemIO classes First, you need to create a DirectoryInfo object that represents the user s choice Second, you need to retrieve a collection of FileInfo objects that represent files in that directory using the DirectoryInfoGetFiles() method To narrow the selection down so that it includes only bitmaps, you use the search expression *bmp.

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