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NET. Keywords, CAPTCHA, Turing test, image, image processing, distort image, VB. ... would be hard for an optical character recognition (OCR) application to read them but ... This distorts the text (and is the hardest part to reproduce in VB 6). vb.net ocr library for windows runtimeIronOCR is unique in its ability to automatically detect and read text from imperfectly scanned images and PDF documents. ... OCR Images to Text in VB.Net Applications. ... The Optical Character Recognition software views content in multiple font styles for accurate text OCR. assertions rather than normal checks If you are using a release of the platform that supports assertions (14 or later), you should use the assert construct; otherwise you should use a makeshift assertion mechanism It is particularly important to check the validity of parameters that are not used by a method but are stored away for later use For example, consider the static factory method on page 86, which takes an int array and returns a List view of the array If a client of this method were to pass in null, the method would throw a NullPointerException because the method contains an explicit check If the check had been omitted, the method would return a reference to a newly created List instance that would throw a NullPointerException as soon as a client attempted to use it By that time, unfortunately, the origin of the List instance might be very difficult to determine, which could greatly complicate the task of debugging Constructors represent a special case of the principle that you should check the validity of parameters that are to be stored away for later use It is very important to check the validity of parameters to constructors to prevent the construction of an object that violates class invariants There are exceptions to the rule that you should check a method's parameters before performing its computation An important exception is the case in which the validity check would be expensive or impractical and the validity check is performed implicitly in the process of doing the computation For example, consider a method that sorts a list of objects, such as Collectionssort(List) All of the objects in the list must be mutually comparable In the process of sorting the list, every object in the list will be compared to some other object in the list If the objects aren't mutually comparable, one of these comparisons will throw a ClassCastException, which is exactly what the sort method should do Therefore there would be little point in checking ahead of time that the elements in the list were mutually comparable Note, however, that indiscriminate application of this technique can result in a loss of failure atomicity (Item 46) Occasionally, a computation implicitly performs the required validity check on some parameter but throws the wrong exception if the check fails That is to say, the exception that the computation would naturally throw as the result of an invalid parameter value does not match the exception that you have documented the method to throw Under these circumstances, you should use the exception translation idiom described in Item 43 to translate the natural exception into the correct one Do not infer from this item that arbitrary restrictions on parameters are a good thing On the contrary, you should design methods to be as general as it is practical to make them The fewer restrictions that you place on parameters, the better, assuming the method can do something reasonable with all of the parameter values that it accepts Often, however, some restrictions are intrinsic to the abstraction being implemented To summarize, each time you write a method or constructor, you should think about what restrictions exist on its parameters You should document these restrictions nd enforce them with explicit checks at the beginning of the method body It is important to get into the habit of doing this; the modest work that it entails will be paid back with interest the first time a validity check fails. vb.net ocr pdf free: Dynamsoft .NET OCR library is a fast and robust Optical Character Recognition component that can be embedded into your a ... vb.net ocr pdfOCR.Net Text Component is a Microsoft Visual Studio.Net component that can be integrated into your application ... 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Create UPCA In Visual Studio .NET Using Barcode maker for ASP .There would not be much point For example, expand User Con guration, Administrative Templates, Control Panel in the main details pane, and notice an option to Force Classic Control Panel view Enable this, and the next time you start the Control Panel, you get he old Windows 2000 style view Also, as you navigate around the Group Policy settings, notice the help that is shown, giving good details of what each policy does if you have the extended view option selected Otherwise, the same help is available via the Explain tab when you double-click an actual setting Notice that settings have an At least Microsoft Windows 2000 or XP or Vista and so on This shows which client OS is needed to apply a policy setting If a policy setting is read by an older OS, the setting is ignored You don t need to create multiple GPOs for each client OS; one size ts all.Related: ITF-14 Generating C# , Printing Data Matrix Excel , VB.NET EAN-13 Generator Fresnel-zone concept presentation in free space. Planet barcode library for .net using barcode printing for vs .net control to generate, create planet image in .Related: use of the method, as it effectively obscures any other exception that may be thrown in the same context While the language does not require programmers to declare the unchecked exceptions that a method is capable of throwing, it is wise to document them as arefully as the checked exceptions Unchecked exceptions generally represent programming errors (Item 40), and familiarizing programmers with all of the errors they can make helps them avoid making these errors A well-documented list of the unchecked exceptions that a method can throw effectively describes the preconditions for its successful execution It is essential that each method's documentation describes its preconditions, and documenting its unchecked exceptions is the best way to satisfy this requirement It is particularly important that methods in interfaces document the unchecked exceptions they may throw This documentation forms a part of the interface's general contract and enables common behavior among multiple implementations of the interface Use the Javadoc @throws tag to document each unchecked exception that a method can throw, but do not use the throws keyword to include unchecked exceptions in the method declaration It is important that the programmer using your API be aware of which exceptions are checked and which are unchecked, as his responsibilities differ in these two cases The documentation generated by the Javadoc @throws tag in the absence of the method header generated by the throws declaration provides a strong visual cue to help the programmer distinguish checked exceptions from unchecked It should be noted that documenting all of the unchecked exceptions that each method can throw is an ideal, not always achievable in the real world When a class undergoes revision, it is not a violation of source or binary compatibility if an exported method is modified to throw additional unchecked exceptions Suppose a class invokes a method from another, independently written class The authors of the former class may carefully document all of the unchecked exceptions that each method throws, but if the latter class is revised to throw additional unchecked exceptions, it is quite likely that the former class (which has not undergone revision) will propagate the new unchecked exceptions even though it does not declare them If an exception is thrown by many methods in a class for the same reason, it is acceptable to document the exception in the class's documentation comment rather than documenting it individually for each method A common example is NullPointerException It is fine for a class's documentation comment to say all methods in this class throw a NullPointerException if a null object reference is passed in any parameter, or words to that effect. 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