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In short, the binary-compatibility add-in puts you in full control of component versioning You can make edits that add or remove compatibility support from the compatibility file, and then let VB regenerate the executable against the current settings This allows you to make simple edits, such as changing a member name, adding a new member, or removing an Implements interface, without creating problems in existing code Although this is a great tool for development, it gives you the opportunity to mess things up pretty badly You should always verify that you can set your binary compatibility file to the last-shipped version and build without receiving compatibility errors
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VB puts a great deal of information in a component's type library, but there is often more typelib-resident information that you need to distribute before your application can run If your component requires such information, you must distribute and administer extra files along with your VB-built binary When you register a VB component, the VB runtime automatically registers its typelib for you You can make VB register more (or less) typelib information by modifying the original typelib and replacing the original typelib with the customized version There are several common scenarios in which you will find this technique very useful All the edits mentioned here are possible with the PowerVB Post-Build Type Library Modifier (PostBuildDII), documented on the book's CD This section simply looks at some of the reasons why you might want to use it If you've described an interface for Implements by using a typelib, and you need that interface to be accessible across thread, process, or machine boundaries, you must register a typelib that contains the interface definition This generally means that you must ship and register a TLB file in addition to the component You can eliminate the extra file dependency by importing the external types into your executable's typelib resource and redirecting all the external references to the internal copy If you've used Implements as an internal (intra-thread) design construct, and you don't want to broadcast this information, you have two
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options First, you can simply leave the interface definition attached to the class and orphan it by not shipping the referenced typelib This is a benign solution unless the binary is an OCX and you need it to work with VB5 In this case, you must ship the referenced library or end up with a control that has no events in the IDE (this OCA-generation bug has been fixed in VB6) Second, you can modify the typelib and delete the rogue interface reference Note that the solution you really want here is support for Private Implements in VB, which would allow a class to support an interface without writing it to the typelib If you implement an interface using the VBoost aggregation objects, the interface is not shown on the coclass If you want to publicize your implementation of this interface, you must add it to the list of implemented interfaces If you've VB-ized a typelib-defined interface to help with Implements, the typelib has a reference to the VB-ized typelib, not the original typelib If you don't ship and register the VB-ized library, this reference dangles and its interface identifier can't be read Some applications verify a component by searching for an implemented interface on a coclass If you want a VB-generated component to be identifiable, you need to redirect the interface to the true typelib instead of the VB-ized version There are some types of data that you can't define in VB For example, you may want to include string constants or aliases with your executable With post-build modification, you can define the types in an external library and merge them into the executable's library before you ship You may find it easier to define structures and enums in a typelib instead of as public entries in a class module This gives you the freedom to modify enums without causing binary-compatibility changes, and it enables alignment capabilities on your public structures If you merge these into your main typelib before you ship, you don't have to redistribute the external libraries
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