Types of compatibility in vb6, DOT NET Programming

Assignment Help:

What are types of compatibility in VB6

There are three possible project compatibility settings:

  • No Compatibility
  • Project Compatibility
  • Binary Compatibility

1) No Compatibility: With this Compatibility setting, new interface ID's, new class ID's,  and a new type library ID will be generated by VB every  time the ActiveX component project is compiled. This will cause any of the compiled client components to fail (with error 429!) and report a missing reference to the 'VB ActiveX Test Component whenever a client project is loaded in the VB IDE.

2) Project Compatibility: With this Compatibility setting, VB will generate a new interface ID's for classes whose interfaces have changed, but will not change the class ID's or the type library ID. This will still cause any of the compiled client components to fail (with error 429!) but will not report a missing reference to the 'VB ActiveX Test Component' whenever  a client project is loaded in the VB IDE. Recompilation of the client components will restore them to the working order again.

3) Binary Compatibility: The VB makes it possible to extend an existing class or interface by adding new methods & properties etc. and yet still remain binary compatibility. It can do this, as it silently creates a new interface ID for the extended interface and adds registration code to register the original interface ID but with a new forward key having the value of this new interface ID. COM will then substitute calls having the old ID with the new ID and so applications built against the old interface will continue to work (assuming the inner workings of the component remain backward compatible!). With that setting, VB will not change any of the existing class, interface or type library ID's, however in order that it can do so, VB requires the project to specify an existing compiled version that it can compare against to assure  that the existing interfaces have not been broken.


Related Discussions:- Types of compatibility in vb6

Event bubbling, What is event bubbling? The Server controls such as  D...

What is event bubbling? The Server controls such as  DataList, Datagrid,  Repeater can have another child controls inside them. For example the DataGrid can have combo box ins

Namespaces in localization and globalization, Which are the namespaces in l...

Which are the namespaces in localization and globalization? There are 2 most important namespaces:- 1)System.Globalization - It contains classes that define culture-relate

I need to develop a project of call accounting and billing, Project Descrip...

Project Description: General information for the business: Call Accounting and Billing Kind of development: New program from scratch Description of each module: Call Accou

What is clr, What is CLR?  CLR is .NET equivalent of Java Virtual Machi...

What is CLR?  CLR is .NET equivalent of Java Virtual Machine (JVM). It is the runtime that changes a MSIL code into the host machine language code, which is then implemented ap

Similarities between class and structure, What are similarities between Cla...

What are similarities between Class and structure? The similarities between structures and classes are as follows:- 1) Both can have constructors, properties, methods, field

A few changes to outloproject description, A few changes to OutloProject De...

A few changes to OutloProject Description: We require someone who is familiar with programming plug-in to work with Microsoft Outlook. Initially we just require a simple chan

How i increment my new file if the file is already present, I have the pro...

I have the project that takes screen shots and saves in the specific folder.(eg.Screen0001) but the problem is that if i close application and run it again then it replace the exis

Connect a software application to a database backend, Connect a Software Ap...

Connect a Software Application to a Database Backend Acquire the knowledge and develop the skills needed to prototype an end user application using a rapid application dev

Develop .net project, Develop .Net project Project Description: We wa...

Develop .Net project Project Description: We want to make .net you have to be good knowledge on the subsequent Microsoft Active Directory, Lync 2010 - 2013 databases

Characteristics of object oriented system''s, What are characteristic's of ...

What are characteristic's of Object Oriented System's? The characteristics of Object Oriented System's are as follows: 1)    Abstraction: The Abstraction allows the comple

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd