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4 The next day, you fix a bug in the new method and recompile the DLL 5 Your compiled EXE now fails with a Type mismatch error when it trys to retrieve the interface The step you missed here is that the new method wasn't found in the compatibility file, so VB regenerated a new IID each time you rebuilt the executable Note that depending on the number and type of edits you made between compiles, the IID might not change if you compile twice in the same IDE session You must copy the DLL that contains the new method as your compatibility file in order to lock down the IID The dilemma here is that the amount of baggage in the compatibility file and hence in your finished product grows every time you add a method Visual Basic requires all the extra information about old interface IIDs to make the DLL a binary replacement for the previous versions of the typelib VB uses the IID resources to provide marshaling support for all the previous interfaces, and uses the resources to enable the QueryInterface function to respond correctly to a request for a previous interface identifier To support marshaling on a legacy interface, VB replaces the Interface\{}\TypeLib key with an Interface\{ }\Forward key that points to the primary interface The Forward key instructs the typelib-driven marshaling engine to treat the interface the same as the currently implemented primary interface You get to carry all this compatibility information around in your finished product The resources get bigger and you add to registry overhead as you extend interfaces, the typelib grows as more and more aliases are added, and the data-driven QueryInterface implementation behind the publicly exposed objects has ever-more data to check before it can reply yes or no to an interface request Fortunately, any client compiled against a new version of the DLL won't be able to get the interface it expects from an old DLL and call a method that is not supported on the old version of the vtable Watching the changes that VB makes to a specific interface offers a lot of insights into the way VB lays out a typelib and the type of conditions against which it tries to protect you The following exercise looks at three versions of a simple class file I'll build a binary compatibility file against the irst version, then modify the class by adding a function and then renaming the first function I'll. vb.net code 128 reader VB . NET Barcode Reader - How to Scan & Read Barcode in VB . NET ...
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