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If you buy barcode-scanners with an USB-connector, they will have ... The VB.NET-code is an automatic translation from C# and may contain ... vb.net barcode scanner programming What event does a barcode reader fire off?-VBForums
VB Code: Private Sub ... event does a barcode reader fire off? The TextChanged event should fire when the barcode reader fills the text box.
If this type check were missing and the quals method were passed an argument of the wrong type, the equals method would throw a ClassCastException, which violates the equals contract But the instanceof operator is specified to return false if its first operand is null, regardless of what type appears in the second operand [JLS, 15192] Therefore the type check will return false if null is passed in, so you don't need a separate null check Putting it all together, here's a recipe for a high-quality equals method: 1 Use the == operator to check if the argument is a reference to this object If so, return true This is just a performance optimization, but one that is worth doing if the comparison is potentially expensive 2 Use the instanceof operator to check if the argument is of the correct type If not, return false Typically, the correct type is the class in which the method occurs Occasionally, it is some interface implemented by this class Use an interface if the class implements an interface that refines the equals contract to permit comparisons across classes that implement the interface The collection interfaces Set, List, Map, and MapEntry have this property 3 Cast the argument to the correct type Because this cast was preceded by an instanceof test, it is guaranteed to succeed 4 For each significant field in the class, check to see if that field of the argument matches the corresponding field of this object If all these tests succeed, return true; otherwise, return false If the type in Step 2 is an interface, you must access the argument's significant fields via interface methods; if the type is a class, you may be able to access the fields directly, depending on their accessibility For primitive fields whose type is not float or double, use the == operator for comparisons; for object reference fields, invoke the equals method recursively; for float fields, translate to int values using FloatfloatToIntBits and compare the int values using the == operator; for double fields, translate to long values using DoubledoubleToLongBits and compare the long values using the == operator (The special treatment of float and double fields is made necessary by the existence of FloatNaN, -00f, and the analogous double constants; see the Floatequals documentation for details) For array fields, apply these guidelines to each element Some object reference fields may legitimately contain null To avoid the possibility of a NullPointerException, use the following idiom to compare such fields:. vb.net barcode scanner tutorial Reading barcode using vb.net code - CodeProject
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