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Similarly, should pop() throw an exception when a request is made to pop a value from an empty stack One interesting observation is that the stack class of the C++ standard library (introduced in 6), does not throw an exception if a pop operation is requested and the stack is empty Instead, the operation has undefined behavior: it is unknown what the program behavior is fter such an operation has been requested When the C++ standard library was designed, it was decided that an exception should not be thrown in this case Allowing the program to continue running while an illegal state had been encountered was deemed appropriate in this situation As we mentioned, different libraries will have different exceptions There is no right answer to the question of what constitutes an exception Not all programs should worry about exceptions thrown by libraries Although it is true that some systems cannot afford down time and should be built to handle exceptional situations, not every program has such requirements Exception handling is primarily an aid to the implementation of fault-tolerant systems Again, deciding whether our programs are to handle exceptions thrown from libraries or whether we should let the program terminate is a difficult part of the design process One last aspect of program design with exception handling is that the handling of exceptions in a program is usually layered A program is usually built of components, and each component must decide which exceptions it will handle locally and which exceptions it will pass to higher levels of the program What do we mean by component For example, the text query system introduced in 6 can be broken into three components or layers The first layer is the C++ standard library, which provides support for the basic operations on strings, maps, and so on The second layer is the text query system itself, which defines functions, such as string_caps() and suffix_text(), that manipulate the text to be processed and uses the C++ standard library as a subcomponent The third layer is the program that uses our text query system Each component or layer is built independently, and each must decide which exceptional situation it will handle directly and which exceptions it will pass to higher levels of the program Not every function in a component or layer should be capable of dealing with exceptions Usually, try blocks and associated catch clauses are used by functions that are the entry points into a program component The catch clauses are designed to handle exceptions that the component does not want to let propagate to higher levels of the program Exception specifications (discussed in Section 114) are also used with the functions that are the entry points into a component to guard against the escape of unwanted exceptions to higher levels of the program We look at other aspects of designing programs with exceptions in 19, after classes and class hierarchies have been introduced. how to use barcode scanner in c# CnetSDK .NET Barcode Scanner Library - Visual Studio Marketplace
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Applying the Barcode Font to a Text View. .Related: In this code, we rst create a new OpenFileDialog object (not necessary if you are using an OpenFileDialog control from the Toolbox), set its ter so that it will show only Text les (with the le extension txt ) or any le ( * ) depending on which the user chooses from the Files Of Type: combo box, and then show it as a dialog box Note the format of the Filter property This is organized as pairs of sub-strings separated by the | character (shift+ \ on my keyboard) The rst substring in a pair is the name of the le type (eg Text les) and the second is a wildcard description of the le type that the operating system will understand We can specify any text le as *txt , meaning a le whose name ends in the extension txt Any le is ** If the user selects a le and presses the OK button we can then retrieve the le-name from the control and go on to open it Note that I ve used a bit of sleazy code in Listing 115, by setting the InitialDirectory property of the OpenDialog control to be ApplicationExecutablePath Strictly speaking, this is the full path to and le-name of the executable program (eg c:\VBNETPrograms\FileDemo\bin\ ledemoexe) and so includes a name for a le However, the OpenDialog control expects only a directory, and will simply ignore the le name part, returning c:\VBNETPrograms\FileDemo\bin\ or whatever folder the program is running from I nd it much easier to store the les belonging to an application in the application s own folder, since if I ever decide to move the program, I can move the folder and the les will come too If you re slavishly following Microsoft s guidelines on where to store data les, the Application property to use in place of ExecutablePath is one of:. 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