Difference between iunknown and idispatcher

It knows when youve finished using it, and it politely excuses itself from the application by. Iunknown is the base class for all olecomactivex components. Affordable, job tracking, dispatching software for pc, mac. Idispatch this interface provides namebased dynamic method dispatch for ole automation com objects. According to the oxford dictionary, both spellings are synonymous for all meanings of the word. It provides the basic ability to cast a instance of a com object to any of its supported interfaces.

It provides the basic ability to cast a instance of a com object to any of its supported interfaces queryinterface. On the client side the difference between an interface and an object is only small. What is the difference between dispatch and despatch answers. Two wizards, in particular, ease the process of creating simple com objects. Vba use the createtypelib2 api function to generate the type library when they build their own com components. We propose pwc, a proactive worm containment solution for enterprises. Idispatch is the interface that exposes the ole automation protocol. Pwc can stop instead of slowing down an infected host from releasing worm scans as early as after merely 4 scans. While its a very simple interface, compared to some of the others well get to later, it does highlight a number of interesting and important behaviors that the. In this video we learn about the iunknown interface the one interface all com objects must implement. Com makes the differences transparent to the client. Explain difference between dim object as object and dim obj as myform.

Idispatch builds on iunknown adding the facility to discover at runtime the attributes and interfaces supported by the specified com object. Activex or com objects can implement the idispatch interface for access by. Extending iunknown, it is one of the standard interfaces that can be exposed by com objects. After its activated, it waits patiently to service your method requests. What is the difference between idispatch and iunkown in com. Difference between managed code and unmanaged code duration. The desktop dispatcher is the easy to use, affordable, dispatching software, for creating, printing, storing and tracking any kind of service call, appointment or customer list. In computer programming, the iunknown interface is the fundamental interface in the. The only difference between spanish castilian and spanish modern is the sort. The idispatch interface has methods that allow clients to ask the object what methods it supports.

However, dispatch is more common in american english and despatch seems to be. Idispatch itself inherits from iunknown and that is the root interface of com. Iunknown and retval rewriting today, were going to finish out the definition of iuknown that we started last time, by adding the three methods to the interface. The only difference between using iunknown and idispatch is that the type. This is usually done by choosing which one iunknown to return and sticking to it. Every object must have an implementation of iunknown to control its own lifetime. Hi, whats the difference between an interface declared with.