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Dim c As New ComCalc i = CType(c, _ComCalc) Console.WriteLine("COM server says 10 + 832 is {0}", _ i.Add(10, 832)) Console.ReadLine() End Sub End Module Now, do understand that invoking a method using the Class-suffixed or underscore-prefixed interface is seldom necessary (which is exactly why the Visual Studio 2005 Object Browser hides these types by default). However, as you build more complex .NET applications that need to work with COM types in more sophisticated manners, having knowledge of these types is critical.

Generally, the hardware requirements for running WCF as part of .NET 3.0 are simple. Running on top of .NET 2.0, the base level requirements are directly related to the .NET 2.0 runtime and .NET 2.0 SDK requirements.

As mentioned, at runtime the CLR will make use of the metadata contained within a .NET interop assembly to build a proxy type that will manage the process of .NET to COM communication. The proxy to which I am referring is the Runtime Callable Wrapper, which is little more than a bridge to the real COM class (officially termed a coclass). Every coclass accessed by a .NET client requires a corresponding RCW. Thus, if you have a single .NET application that uses three COM coclasses, you end up with three distinct RCWs that map .NET calls into COM requests. Figure 17-7 illustrates the big picture.

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There is always a single RCW per COM object, regardless of how many interfaces the .NET client has obtained from the COM type (you ll examine a multi-interfaced VB 6.0 COM object a bit later in this chapter). Using this technique, the RCW can maintain the correct COM identity (and reference count) of the COM object.

s Note The .NET runtime and the .NET SDK have different base requirements. Running the SDK, tools, utilities, and compilers requires additional resources. Given that most developers are leveraging Visual Studio .NET 2005 as their primary development environment (although not required), they should have as much memory, CPU, and disk space as they can afford.

Again, the good news is that the RCW is created automatically when required by the CLR. The other bit of good news is that legacy COM servers do not require any modifications to be consumed by a .NET-aware language. The intervening RCW takes care of the internal work. To see how this is achieved, let s formalize some core responsibilities of the RCW.

that Shared folder Beyond sharing a common .plist file, a Universal project can also share common classes, databases, resources, and select controllers and UI views!

The RCW is in charge of transforming COM data types into .NET equivalents (and vice versa). As a simple example, assume you have a VB 6.0 COM subroutine defined as follows: ' VB 6.0 COM method definition. Public Sub DisplayThisString(ByVal s as String) The interop assembly defines the method parameter as a .NET System.String: ' VB 2005 mapping of COM method. Public Sub DisplayThisString(ByVal s as System.String) When this method is invoked by the .NET code base, the RCW automatically takes the incoming System.String and transforms it into a VB 6.0 String data type (which, as you may know, is in fact a COM BSTR). As you would guess, all VB 6.0 COM data types have a corresponding .NET equivalent. To help you gain your bearings, Table 17-1 documents the mapping taking place between COM IDL (interface definition language) data types, the related .NET System data types, and the corresponding VB 2005 keyword. Table 17-1. Mapping Intrinsic COM Types to .NET Types

At the time of this writing, Table 4-1 represents the minimum hardware requirements for the processor and RAM, and Table 4-2 represents the minimum hardware requirements for hard disk space. Table 4-1. Hardware Requirements: Processor and RAM

wchar_t, short long, int Hyper unsigned char, byte single double VARIANT_BOOL BSTR VARIANT DECIMAL DATE GUID CURRENCY IUnknown IDispatch

System.Int16 System.Int32 System.Int64 System.Byte System.Single System.Double System.Boolean System.String System.Object System.Decimal System.DateTime System.Guid System.Decimal System.Object System.Object

Figure 2 5. Sharing common source files and resources for both iPhone and iPad platforms within a single Universal project is yet another reason why utilizing the MVC design pattern is so important.

Short Integer Long Byte Single Double Boolean String Object Decimal DateTime Guid Decimal Object Object

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