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Now that you have fleshed out the details of building a COM class with a single (default) interface, insert a new *.cls file that defines the following IDriverInfo interface: Option Explicit ' Driver has a name Public Property Let driverName(ByVal s As String) End Property Public Property Get driverName() As String End Property If you have created COM objects supporting multiple interfaces, you are aware that VB 6.0 provides the Implements keyword. Once you specify the interfaces implemented by a given COM class, you are able to make use of the VB 6.0 code window to build the method stubs. Assume you have added a private String variable (driverName) to the CoCar class type and implemented the IDriverInfo interface as follows: ' Implemented interfaces ' [General][Declarations] Implements IDriverInfo ... ' ***** IDriverInfo impl ***** ' Private Property Let IDriverInfo_driverName(ByVal RHS As String) driverName = RHS End Property Private Property Get IDriverInfo_driverName() As String IDriverInfo_driverName = driverName End Property To wrap up this interface implementation, set the Instancing property of IDriverInfo to PublicNotCreatable (given that the outside world should not be able to New an interface reference).

Under VB 6.0 (as well as COM itself), we do not have the luxury of classical implementation inheritance. Rather, you are limited to the use of the containment/delegation model (the has-a relationship). For testing purposes, add a final *.cls file to your current VB 6.0 project named Engine, and set its instancing property to PublicNotCreatable (as you want to prevent the user from directly creating an Engine object). The default public interface of Engine is short and sweet. Define a single function that returns an array of strings to the outside world representing pet names for each cylinder of the engine (okay, no right-minded person gives friendly names to his or her cylinders, but hey . . .): Option Explicit Public Function GetCylinders() As String() Dim c(3) As String c(0) = "Grimey" c(1) = "Thumper" c(2) = "Oily" c(3) = "Crusher" GetCylinders = c End Function Finally, add a method to the default interface of CoCar named GetEngine(), which returns an instance of the contained Engine (I assume you will create a Private member variable named eng of type Engine for this purpose):

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WSDL is an XML Schema based description of supported operations and messages for an endpoint. MEX represents a message exchange protocol that allows the discovery of WSDL, WS-Policy, or XML Schema associated with a target namespace. More information is available at the following location: http://specs.xmlsoap.org/ws/2004/09/mex/WS-MetadataExchange.pdf.

' Return the Engine to the world. Public Function GetEngine() As Engine Set GetEngine = eng End Function At this point you have an ActiveX server that contains a COM class supporting two interfaces. As well, you are able to return an internal COM type using the [default] interface of the CoCar and interact with some common programming constructs (enums and COM arrays). Go ahead and compile your sever (setting binary compatibility, once finished), and then close down your current VB 6.0 workspace.

Starting with version 3.2, iOS includes some compelling new graphics capabilities. Besides the larger screen in the iPad, the software has also been updated with some new features that will help developers make their apps even better. This chapter covers two of these new features: the UIBezierPath class, which can be used to draw and fill shapes of all kinds, and the ability to render directly to PDF format anything that you can draw on the screen, you can also send straight to a PDF file! One bit of graphics functionality that apparently hasn t changed is OpenGL. The iPad uses the same graphics hardware, and the same OpenGL ES 2.0, that the iPhone 3GS uses. Therefore, any OpenGL code you ve written for iPhone in the past should work with little or no changes on the iPad (for that matter, any Quartz/CoreGraphics drawing code should also be functionally equivalent).

Rather than making use of the tlbimp.exe utility to generate our interop assembly, simply create a new console project (named VbNetCarClient) using Visual Studio 2005 and set a reference to the Vb6ComCarServer.dll using the COM tab of the Add Reference dialog box. Now, examine the interop assembly using the VS 2005 Object Browser utility, as shown in Figure 17-13.

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