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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 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 first version, then modify the class by adding a function and then renaming the first function I'll. vb.net read barcode from camera How to Implement Barcode reader to VB.Net - MSDN - Microsoft
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If you are programmer in VB.NET, then here is the ... all the functions exported from the library is wasteful of space) Instead, Symbian OS only uses link by ordinal, which has signi cant implications for binary compatibility Ordinals must not be changed between one release of a DLL and another, otherwise code which originally used the old DLL will not be able to locate the functions it needs in the new version of the DLL I ll discuss binary compatibility further in 18.2 If the required address for the data has already been occupied when a DLL comes to load, the DLL will not be usable This is quite possible, because the data is placed in a chunk which means that its address must start on a megabyte boundary, of which there are few A workaround would be to copy the program code for the DLL, and adjust he copy to use a different address for the static data, but the overhead would be unacceptably high. 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Encode an ASCII character: The format ~ddd may be used .Related: ASP.NET ITF-14 Generator , QR Code Generation Java , ASP.NET UPC-E Generation Neither the single.php nor the page.php does anything weird r fancy, so I ll save us some trees and leave those out. Code 2 Of 7 Drawer In Java Using Barcode generation for Java Control to generate, create NW-7 .Related: .NET EAN-8 Generation , UPC-E Generating .NET , .NET ISBN Generating you add new methods to it The interface identifier is used during the Set statement to verify that the running objects support the IID promised by its designtime typelib description If a new client calls an old DLL that doesn't support the latest and greatest interface, the Set statement fails If you simply add new methods to the end of the vtable and leave the IID the same, the Set statement succeeds, but a subsequent method call might call a function off the end of the vtable (which almost always results in a crash) In either case, your program can't continue if the client code calls a method that isn't supported by the current version of the ActiveX DLL VB's IID odification process provides a kindler, gentler fatal error, but it's still a fatal error Constantly churning IIDs during rebuilds makes the individual components moving targets This can cause a number of problems during the development cycle This doesn't just create the bloat I've already described: It also forces you to recompile all the pieces of your application that consume a modified component, even if the calling code doesn't use the modified methods This problem is compounded when you work in a development team or if you call components from C+ + , which is forced to regenerate header files whenever the target typelib changes You want some level of compatibility control during the development process, but you rarely want the iron-clad protection that VB offers The full armor certainly doesn't hurt the shipping versions, but it is excessively cumbersome if you have to wear it all the time If you want the IID to remain the same when you modify an interface, you must pick and choose among three types of compatibility The type of compatibility you need depends entirely on how current versions of calling applications. 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