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How does the program behave at the boundaries For example, if you have a numeric calculation say, you are dividing one number by another what happens when you provide an extreme example, such as dividing a number by zero What if you put a very large number into one of the fields Try it again with the real user interface. To save you having to try every possible number, go straight to 1 followed by 39 zeroes: 1000000000000000000000000000000000000000. Enter this number in the Centigrade field and press Tab, and you will see the string "inf" in the other field. This seems to suggest a unit test (see Listing 11 7):
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Listing 6 12. The CCSprite Class Can Store Animations for You, Which Can Be Retrieved by Name CCAnimation* anim = [CCAnimation animationWithName:@"move" delay:1 frames:frames]; // Store the animation in the CCSprite node [mySprite addAnimation:anim]; // Sometime later: retrieve the move animation from the CCSprite node CCAnimation* moveAnim = [mySprite animationByName:@ move ];
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You use TextBox controls for data entry by the user (see Figure 3-15). Usually these controls enable the user to enter a single line of text, but you can change them to allow multiline text entry. Typically, you ll trap the KeyDown, KeyUp, and KeyPress events for a TextBox control. The KeyDown and KeyUp events occur in sequence when any key is pressed. A KeyPress event may occur when any of the following keys or key combinations are pressed: Any printable keyboard character Ctrl combined with a character from the standard alphabet Ctrl combined with any special character Backspace Esc A KeyPress event won t occur under any of the following situations: Pressing the Tab key Pressing the Enter key Pressing an arrow key When a keystroke causes the focus to move from one control to another Figure 3-15. A UserForm with a TextBox control
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I ve always enjoyed my grandparents use of old-timey words and phrases. When my great-uncle wanted to know what was troubling me, he d always ask What vexes you When it comes to database problems, Gartner Research has already answered that question for us. Their research shows that about 80 percent of database performance problems comes from poorly or improperly coded SQL statements, 15 percent from database design, and 5 percent from poor or inadequate hardware configurations. Contrary to Gartner s wisdom, most attempted remedies to performance problems with database applications are exactly the opposite of what research shows us is the source of the problem. We ve all heard product managers who, when encountering a performance problem with their applications, declare, Let s put in more RAM or another CPU! But if you ve been around for a while, you know that a poorly coded SQL Server application can suck up all the hardware you give it, and still want more. When adding hardware doesn t work, the product manager usually says, Let s try to throw a few more indexes in there. That ought to fix it! But more indexes can t help a query or transaction that doesn t utilize the indexes. By implementing a few simple processes to check your code using PerfMon and Profiler, you can help ensure that all the SQL and T-SQL code used in your application performs optimally.
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The do shell script command is simple: it takes a string as its direct parameter and executes it as if you had typed it in the Terminal application and pressed Return (though it has a few differences, which I ll discuss along the way).
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Figure 14.15 In addition to the % Processor Time counter, which is displayed automatically, additional performance counters can be added by clicking the green + icon on the toolbar.
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CALL THE UPDATEPIXELDATA METHOD WHEN THE MOUSE MOVES ACTION 1 In the MainForm.cs [Design] window, add a MouseMove event handler for the pnlPhoto object. Call the UpdatePixelData method with the current mouse pointer coordinates. RESULT
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stored on another computer unless you re running in a small farm environment where SQL is local to the IIS Server. NTLM can t pass your credentials to the SQL Server, because it only allows one hop (IE to IIS) for security reasons. You ll also find that connecting to the Active Directory via an ASPX page isn t possible using NTLM, as that would also require a second hop. Figure 3.1 illustrates this.
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The ROME newsfeed parser was created by developers at Sun Microsystems. Their goal was to create an open source Java newsfeed parser and generator that can handle all forms of RSS and Atom with minimal dependencies and a high degree of extensibility. Let s take a brief look at ROME s advantages and disadvantages so that we can compare it to our other options. In chapter 7, we ll cover ROME in depth. Unlike the Universal Feed Parser, which models each newsfeed as a dictionary, ROME uses object models to represent newsfeeds at different levels of abstraction. ROME can parse an RSS newsfeed into an RSS-like object model for those who wish to operate in terms of RSS constructs. ROME can parse an Atom newsfeed into an Atom-like object model for those who wish to work in terms of Atom. But most developers will work instead with ROME s simple SyndFeed model, an abstract model designed to represent all forms of Atom and RSS. ROME is designed around a simple core, which includes parsers, converters, and generators for all of the commonly used RSS and Atom newsfeed formats. ROME s subprojects, which are distributed separately, provide newsfeed extension support, a newsfeed parser, a facility for storing ROME objects in a database, and the ROME Fetcher for efficient fetching of newsfeeds. Below is our parse and print example, written in Java using ROME. It shows how to parse an RSS or Atom newsfeed to a SyndFeed model and print each item s title, description, link, and date.
<UserControl x:Class="MarkupExtensionExample.MainPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="400" Height="300"> <UserControl.Resources> <Style x:Key="TextBlockStyle" Style TargetType="TextBlock"> resource <Setter Property="FontSize" Value="25" /> <Setter Property="Foreground" Value="DarkGray" /> </Style> </UserControl.Resources> <StackPanel x:Name="LayoutRoot"> <TextBlock Text="{Binding LastName}" Style="{StaticResource TextBlockStyle}" /> <TextBlock Text="{Binding FirstName}" Style="{StaticResource TextBlockStyle}" /> <TextBlock Text="{Binding MiddleInitial}" Style="{StaticResource TextBlockStyle}" /> </StackPanel> </UserControl>
The Polyline object is similar in function to the LWPolyline object, but it s stored in an alternate format. It s a 2-D or 3-D line consisting of straight and arced segments, but the segments are stored as distinct entities. A number of different polyline types are available; the following list illustrates their AutoCAD command-line equivalent and a description of each type: PLINE = 2D polyline (AcadPolyline) 3DPOLY = 3D polyline (Acad3DPolyline) 3DMESH (also EDGESURF, RULESURF, TABSURF, etc.) = N x M 3D mesh (AcadPolygonMesh) PFACE = Irregular 3D mesh (AcadPolyfaceMesh)
CREATE THE PHOTO COLUMNS PROGRAMMATICALLY Action 5 In the MainForm.cs code window, create constants to hold the positions of the columns when photographs are displayed. Add a private LoadPhotoData method.
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