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IDispatchGetlDsOfNames function The name/ID translation adds significant overhead to the call, especially in cases in which you make cross-thread or cross-process calls The Implements keyword (discussed in 5) leaves little excuse for using late binding in your code If you use late binding, you're asking for performance degradation and runtime bugs that the compiler would have caught had you used hard-typed object variables The exception to this rule is scenarios that require name binding at runtime (see "Name Binding at Runtime" in this chapter)

package wsdlDate; public class DateClient { public static void main(String [] args) throws Exception { wsdlDate.ws.SimpleDateService service = new wsdlDate.ws.SimpleDateServiceLocator(); wsdlDate.ws.SimpleDate dateProxy = service.getwsdlDate(); System.out.println(dateProxy.getDate()); System.out.println(dateProxy.getDate("dd-MM-yyyy")); } }

These tools all found the Bluetooth devices because they were in discoverable mode. The simple act of not having the device in this mode would stop it from being viewed by these applications. However, it is possible to find Bluetooth devices that are not in discoverable mode.

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The use of INTERFACE DESCRIPTION in Axis and other Web Services frameworks combines the benefits of using reflective code as a local interface repository with INTERFACE DESCRIPTIONS that can be sent to the client. WSDL is mainly used for providing interoperability and platform independence of Web Services implementations. With a WSDL description of a Web Service say obtained with a lookup service such as UDDI, or downloaded from the server the developer can generate a CLIENT PROXY that also works with Web Services frameworks or programming languages other than Axis/Java. In this way, for example, a .NET Web Services client can access the Web Services implementation written in Axis/Java. Hence most Web Services frameworks generate WSDL code dynamically from a deployed Web Service and offer this WSDL code to be downloaded by remote clients.

Apart from avoiding late binding, there is little you can do to affect how VB binds objects to functions However, you can affect when VB binds Clearly, VB binds a function to an object whenever you use the dot operator between an object variable or expression and a function call But you don't actually have to use a dot in your code in order to make VB generate a bound-function call The first place where VB generates binding code for you automatically is with application objects When a type library specifies the appobject attribute on a creatable class, VB automatically declares an implicit As New variable with the name and type of the class The compiler then attempts to bind unqualified names to the implicit variable For example, the DBEngine class in the DAO object model is flagged as an application object, so VB automatically provides the following declaration for you Public DBEngine As New DBEngine This implicit declaration has project-level scope The compiler resolves names to this scoping level after it tries local, module-level, and global scope In the first two lines of the following code snippet, the library name works as a name-resolution operator that tells the compiler which library to bind to This qualifier lets the compiler bypass the name search in higher-priority scoping levels and in referenced libraries with priorities above DAO However, specifying the library name does not generate extra code Since DBEngine is an application object, it always binds to the Workspaces function, regardless of whether you actually typed the DBEngine name The four lines shown below generate exactly the same code

Finding Bluetooth devices that are not in discoverable mode requires guessing the hardware ID of the Bluetooth device and pinging it for a response. While that may seem like a long shot, it can be done by categorizing different devices that start with different hardware IDs. For instance, consider the RedFang tool. Running the RedFang command fang l shows a list of valid manufacturer codes for different Bluetooth devices. The manufacturer code is the first part of the MAC address. Figure 9.8 shows the output of the aforementioned command.

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