winforms qr code reader

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that you didn t explicitly mark as checked or unchecked. If an exception occurs, you ll easily detect it and be able to fix the bug in your code. For the release build of your application, use the compiler s /checked switch so that the code runs fast and exceptions won t be generated. Important The System.Decimal type is a very special type. Although many programming languages (C# and Visual Basic included) consider Decimal a primitive type, the CLR does not. This means that the CLR doesn t have IL instructions that know how to manipulate a Decimal value. If you look up the Decimal type in the .NET Framework documentation, you ll see that it has public, static methods called Add, Subtract, Multiply, Divide, and so on. In addition, the Decimal type provides operator overload methods for +, , *, /, and so on. When you compile code using Decimal values, the compiler generates code to call Decimal s members to perform the actual operation. This means that manipulating Decimal values is slower than manipulating CLR primitive values. Also, because there are no IL instructions for manipulating Decimal values, the checked and unchecked operators, statements, and compiler command line options have no effect. Operations on Decimal values always throw an OverflowException if the operation can t be performed safely.

The IndentedLogging aspect declares an abstract pointcut, loggedOperations(), that the subaspects should define to capture the operations they are logging. The IndentedLogging aspect simply increments the indentation level before executing the join points captured by loggedOperations() and decrements after their execution. By providing a before advice to the java.io.PrintStream. println() method and appending spaces corresponding to the indentation level to the System.out stream, we get the indentation effect. If you are using a logging kit instead of System.out, you will want to modify this advice, perhaps replacing it with an around advice, to get the indentation effect. Now let s change the aspect, TraceAspectV1, from listing 5.10 so that the log output will be indented. Listing 5.19 modifies the aspect by making it a subaspect of IndentedLogging that indents the log messages according to the call depth.

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In the last chapter, you built your first subclass: the labeledwebview class. You ll be building lots more subclasses in your SDK work, and you ll often want to connect them into Interface Builder so you can connect outlets and actions to them. How do you access these new classes in Interface Builder when they don t appear in the Library window It turns out that you need to use the Identity tab, which you ve already met (in figure 12.6). Table 12.2 outlines the two-step process.

for ( element = 0; element < elementCount; element++ ) { // Use right shift to divide by two. Substituting the // right-shift operation cuts the loop time by 75%. elementList[ element ] = elementList[ element ] >> 1; }

Execution Engine (MSCorEE.dll (shim) Clr.dll (actual CLR)

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The OVER clause allows you to request window-based calculations. You can use this clause with aggregate functions (both built-in and custom common language runtime [CLR]-based aggregates), and it is a required element for the four analytical ranking functions (ROW_NUMBER, RANK, DENSE_RANK, and NTILE). The OVER clause de nes the window of rows over which the aggregate or ranking function is calculated. I won t discuss applications of windows-based calculations here, nor will I go into detail about exactly how these functions work; I ll only explain the phases in which the OVER clause is applicable. I ll cover the OVER clause in more detail in s 6 and 8. The OVER clause is applicable only in one of two phases: the SELECT phase (5) and the ORDER BY phase (6). This clause has access to whichever virtual table is provided to that phase as input. Listing 1-3 highlights the logical processing phases in which the OVER clause can be used.

For perthis() associations, the join point s execution object matches the aspect instance s associated object. For pertarget() associations, the join point s target object matches the aspect s associated object. For percflow() associations, the join point is in the control flow of the aspect s associated control flow. For percflowbelow() associations, the join point is below the control flow of the aspect s associated control flow.

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