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Now you can bring up Visual Basic 6, add a reference to this NetComponent.tlb file, and use the .NET class as if it were a standard COM component. (See the companion CD for a demo client written in Visual Basic 6.)
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.NET components undergo all the usual binding and probing rules, even when they are accessed by COM clients. If you don t install the assembly in the GAC, the assembly should be stored as a private assembly in the unmanaged application s directory. If the client is a Visual Basic 6 running inside the IDE (as opposed to compiled on disk), the application s directory is C:\Program Files\Microsoft Visual Studio\VB98 namely, the directory where the VB6.EXE executable resides.
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The RegAsm and TlbExp Utilities
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You can also use a couple of utilities in the .NET SDK to export a .NET assembly to a type library. You should become familiar with these utilities because they offer some extra flexibility that you can t achieve solely with Visual Studio .NET s export capabilities. The Assembly Registration Tool (RegAsm) takes the name of an assembly and registers all the classes it contains in the system registry:
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REGASM samplenetcomponent.dll /tlb:netcomp.tlb
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The /tlb switch is optional, but you ll want to use it so that RegAsm produces a type library that COM clients can use to reference .NET objects through early binding. In practice, you can omit the /tlb switch and not create a type library for the component only if COM clients create and use instances of the .NET class exclusively via late bind ing, by means of the CreateObject function and Object (or Variant) variables. You can think of RegAsm as a RegSvr32 utility that works with .NET components instead of COM components. As with the RegSvr32 utility, you can unregister a com ponent from the registry with the /u option:
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REGASM samplenetcomponent.dll /u
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Figure 30-8 shows all the registry keys that RegAsm has created for the sample assem bly. As you see, .NET components appear to be exposed to COM clients by the mscoree.dll. The InProcServer32 key contains three additional values that let mscoree.dll find the assembly: Assembly, Class, and RuntimeVersion. The RegAsm utility supports two more useful switches. The /codebase option adds a CodeBase registry entry, and should be used only if the .NET assembly isn t shared or isn t going to be registered in the GAC. (Visual Studio .NET uses the /codebase option when exporting an assembly.)
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REGASM samplenetcomponent.dll /codebase
30:
PInvoke and COM Interop
Figure 30-8 The .NET component displayed in the OleView utility. All .NET components exposed to COM can be found in the .NET category subtree.
The other option is /regfile, which doesn t register the component but creates a .reg file that you can later use to create all the necessary registry keys. (You can t use this option with /u or /tlb, and you can t duplicate its effect from inside Visual Studio.)
REGASM samplenetcomponent.dll /regfile:netcomp.reg
The .NET SDK offers another tool that you can use to export a type library, the Type Library Exporter utility (TlbExp). TlbExp has the same effect as using the /tlb option with RegAsm, except the component isn t registered:
TLBEXP samplenetcomponent.dll /OUT:netcomp.tlb
If you omit the /out option, TlbExp creates a type library with the same name as the source DLL but with a .tlb extension. In practice, you ll use TlbExp far less frequently than RegAsm.
Conversion Details
.NET assemblies embed more metadata than COM type libraries; therefore, it is unavoidable that some information is lost in the conversion process from .NET to COM. In most cases, you don t need to care about these details, but there are a few things that you should keep in mind. In this section, I ll summarize what you should be careful about. Assembly version information consists of a 4-part number, whereas type libraries support only major and minor version numbers. During the conversion process, the assembly s revision and build version numbers are discarded. If the assembly had no version information that is, the version is 0.0.0.0 the type library is assigned version 1.0; otherwise, it couldn t be loaded correctly by a COM client.
Part VII:
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