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

Create custom controls in asp.net, How can we create custom controls in ASP...

How can we create custom controls in ASP.NET? The User controls are created using .ASCX in ASP.NET. After that .ASCX file is created you need two things in order to that the AS

Costing, how much guys cost for small 5 pages website designing in .net?

how much guys cost for small 5 pages website designing in .net?

Custom ui navigation front end to connect to online print, Project Descript...

Project Description: This is an online customization printing system they use for multiple organizations to allow customizing  and access of materials they allocate to drive iss

Full time contractual programming position, Project Description: This is...

Project Description: This is a full time contractual role seeking for a sports advisory service. We are data insights consultancy specializing in sports. We consult to a number

Digital invy - inventory management, Project Description: Digital invy -...

Project Description: Digital invy - inventory management Main Features User friendly windows based software Multi Branch Multi company facility Multi user Integra

ASP.Net MVC, how can we use entity framework in ASP.Net MVC

how can we use entity framework in ASP.Net MVC

Need help to answer questions of vb.net, Project Description: Need help ...

Project Description: Need help to answer questions of VB.NET Skills required are .NET, Software Development, C# Programming, Visual Basic, Windows Desktop

Windowsapplications., what is the code for calculator in windowsapplication...

what is the code for calculator in windowsapplication

Explain manifest, What is Manifest? Assembly metadata is keeps in Manif...

What is Manifest? Assembly metadata is keeps in Manifest. Manifest contains all the metadata required to do the following things     Version of assembly.     Security ide

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