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Using the techniques you ve learned, it s easy to create a simple web page that uses GDI+. The next example uses GDI+ to render some text in a bordered rectangle with a happy-face graphic next to it. Here s the code you ll need: protected void Page_Load(Object sender, EventArgs e) { // Create an in-memory bitmap where you will draw the image. // The Bitmap is 300 pixels wide and 50 pixels high. Bitmap image = new Bitmap(300, 50); // Get the graphics context for the bitmap. Graphics g = Graphics.FromImage(image); // Draw a solid yellow rectangle with a red border. g.FillRectangle(Brushes.LightYellow, 0, 0, 300, 50); g.DrawRectangle(Pens.Red, 0, 0, 299, 49); // Draw some text using a fancy font. Font font = new Font("Alba Super", 20, FontStyle.Regular); g.DrawString("This is a test.", font, Brushes.Blue, 10, 0); // Copy a smaller gif into the image from a file. System.Drawing.Image icon = Image.FromFile(Server.MapPath("smiley.gif")); g.DrawImageUnscaled(icon, 240, 0); // Render the entire bitmap to the HTML output stream. image.Save(Response.OutputStream, System.Drawing.Imaging.ImageFormat.Gif);

Note that at this point, you ll need to edit your config/database.yml file to reflect your database connection parameters. Put the code in Listing 13-3 in your single controller.

occur at runtime due to factors outside your control. However, you obviously shouldn t use exception handlers to hide the bugs that might crop up in your code! Instead, you need to track down these programmer mistakes at development time and correct them. Visual Studio s debugging features (which were described in 4) can help you in this task.

Every exception class derives from the base class System.Exception. The .NET Framework is full of predefined exception classes, such as NullReferenceException, IOException, SqlException, and so on. The Exception class includes the essential functionality for identifying any type of error. Table 8-1 lists its most important members. Table 8-1. Exception Properties

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Use the Esc key to close the Mouseover DOM Inspector window Other commands can be found on the Inspector s home page What good are these DOM manipulation methods, other than for having some fun One potential use of these methods is rapid prototyping Consider, for instance, that you re halfway through a development iteration and you re showing your latest work to your business customer Your customer sees a page you ve built and decides that a certain section of text is no longer necessary and that another section should be moved to the bottom of the page Instead of recoding the JSP (or JSPs) and redeploying the application, you can simply modify the page using the Mouseover DOM Inspector and receive immediate feedback from your customer..

Listing 13-3. Budget Optimizer Controller (app/controllers/budget_optimizer_controller.rb)

A link to a help document, which can be a relative or fully qualified URL (uniform resource locator) or URN (uniform resource name), such as file:///C:/ACME/MyApp/help.html#Err42. The .NET Framework doesn t use this property, but you can set it in your custom exceptions if you want to use it in your web page code. A nested exception. For example, a method might catch a simple file IO (input/output) error and create a higher-level operation failed error. The details about the original error could be retained in the InnerException property of the higher-level error. A text description with a significant amount of information describing the problem. The name of the application or object where the exception was raised. A string that contains a list of all the current method calls on the stack, in order of most to least recent. This is useful for determining where the problem occurred. A reflection object (an instance of the System.Reflection.MethodBase class) that provides some information about the method where the error occurred. This information includes generic method details such as the method name and the data types for its parameter and return values. It doesn t contain any information about the actual parameter values that were used when the problem occurred. A method useful for nested exceptions that may have more than one layer. It retrieves the original (deepest nested) exception by moving to the base of the InnerException chain.

GetBaseException()

class BudgetOptimizerController < ApplicationController def index end def report @excel_view = params[:view_as_excel] @target_clicks=params[:target_clicks].to_f results_raw=AdResult.find(:all, :select=>'headline, AVG(cost) as cost, AVG(clicks) as clicks', :group=>'headline') results_raw.sort! { |x,y| (x.cost/x.clicks <=> y.cost/y.clicks) } @results = [] click_sum = 0.0 results_raw.each do |r| @results << r click_sum += r.clicks break if click_sum > @target_clicks end @estimated_clicks = click_sum @avg_cost_per_click = ( @results.inject(0.0) { |sum,r| sum+=r.cost } ) / @results.inject(0.0) { |sum,r| sum+= r.clicks } )

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