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Os leitores de códigos de barras (normalmente) funcionam como um teclado.. ou seja, fazem a leitura do código de barras e retornam (escrevem) o respectivo código (numero/letras) e no final (normalmente) retornam um "ENTER".. ou seja, é como se usasses o teclado nessa caixa de texto e depois carregasses no enter.

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