Scriptable objects must implement the idispatch com interface, and this is supported by atl through the idispatchimpl template class. These cards are typically called converged cards or dual interface cards. It provides the basic ability to cast a instance of a com object to any of its supported interfaces queryinterface. I read some msdn document and some other forum discussions about the differences between idispatch and dispinterface, but still confused. Dual interface is also poised for growth in both banking and transit sectors, as the payments industry continues its transition to emv chip cards and transit boards explore openloop fare collection systems. One factor working in favor of dual interface is a reduction in price. A dual interface derives from idispatch and uses only automationcompatible types. We also provide our very own dual interface card called universal jcard. The main difference is in the way of calling object methods. Contactless smart cards and dual interface smart cards help to enhance security, reduce frauds, and allow.
As youll see later in this chapter, each type of automation controller has its benefits. This section describes the idispatchex interface itself, the differences between idispatch and idispatchex, and the. Use idispatchimpl for default implementation for idispatch. The second, more limited camp is reserved for pure automation clients.
Microsoft windows script interfaces idispatchex interface. Intel expi9402pt 10100mbps pciexpress pro pt dual port server adapter standards. This section describes the idispatchex interface itself, the differences between idispatch and idispatchex, and the rationale for the extensions. And when we declare dispinterface someinterce, then it means someinterface. The idispatch interface exposes a number of methods for automation clients that require latebinding such as scripting languages. Idispatchimplex template classes for multiinterface. So, today my mind has been 100 % focused on something that on the surface looks really boring. Server developers must provide the standard component object model com interface idispatch for their accessible objects. A dual interface also provides idispatch style entry points for automation clients such as vbscript and javascript. And you may even know that its required by comobjects used in autoit with. Idispatchimplex replaces atlidispatchimpl and implements typeinfodriven dispatch on multiple dual interfaces.
A dual interface card is a microprocessor card which also has a contactless interface. Figure 38 a dual interface is a hybrid of an idispatch interface and a custom. A lot of you probably heard the name idispatch before. Template classes support implementation of scriptable com objects. Customized to your unique requirements, cardlogix will walk you through your options. Smart cards contact, contactless, dual interface and hybrid. I cant use ireflect interface here due to design issues, i need to handle getidsofnames and invoke manually.
Dualinterface cards deliver on promise of flexibility. Because isomedualinterface derives from idispatch, the first seven functions of isomedualinterface are those of idispatch. Dualinterface terminals are able to process transactions from various payment products including chip contact cards. Dual interface cards are typically used in government, id, banking and transport markets where a card with a larger memory compared to a standard contactless card, higher security and multiple interfaces is. Automation controllers are clients that use the com idispatch interface to access the com server objects. Many cards contain both contact and contactless technology. Jan 24, 2009 puredispatchimpl used to implement a pure idispatch interface that does typeinfodriven dispatch on one or more pure iunknownderived com interfaces. The controller must first create the object, then query the objects iunknown interface for a pointer to its idispatch interface. Idispatch, dispinterfaces, vtable interfaces, dual interfaces, etc. Channel management commands only affect the logical channels in the interface where the commands are issued. Dual interface automation objects are typically built as their own class, which may privately have a reference to your form.
These languages are perfectly aware of queryinterface qi and can generally access any interface supported by a component through the vtable, or custom portion of a dual interface. Probably, microsofts examples are all dual because they want their examples to work with both scripting and lowlevel languages lowlevel languages can use idispatch, but it takes more work. Here, the same chip is addressed via the contact interface and via the contactless rfid antenna. Extending iunknown, it is one of the standard interfaces that can be exposed by com objects. This technology is mainly used for bank cards and credit cards and allows fast, contactless payment at the terminal. Atl contains the template class idispatchimpl that implements typeinfodriven dispatch on a single dual idispatch derived com interface. You use different idl attributes depending on whether you are implementing a pure idispatch interface or a dual interface. Dualinterface refers to the ability of the terminal to accept both contact and contactless chip cards or payment devices such as mobile phones. This technology is mainly used for bank cards and credit cards and. Interac flash, the new contactless enhancement of interac direct payment, increases the functionality of interac branded debit cards by leveraging dual interface microprocessors that give cardholders the ability to carry out a pointofsale debit transaction using the contact or contactless feature of the card. Dual interface refers to the ability of the terminal to accept both contact and contactless chip cards or payment devices such as mobile phones.
If different reading technologies are available, dual interface cards can be used. A dual interface also provides idispatchstyle entry points for automation clients such as vbscript and javascript. Difference between dual interface and dispatch only. Cmultidispatch multiple idispatch interfaces for automation clients. A dual interface is a dispinterface that makes all the functions that are available through invoke also available through vtbl. The idispatch interface was defined so that a single, standard interface 2 could be used by all components wanting to expose their functionality to interested clients. Dualinterface cards are becoming more prevalent in markets that need highersecurity applications and where the cards are needed for multiple uses when the goal is to combine a traditional payment card that relies on a contact interface for merchant payments with a transit card that requires contactless, dual interface is an ideal solution. Dual interface terminals are able to process transactions from various payment products including chip contact cards, contactless cards, mobile devices and magneticstripe cards. If you require dual interface cards we offer a great range by leading brands such as nxp and infineon. A dual interfacecombi card is a microprocessor card which also has a contactless interface. If the client calls function1, function2, or function3 on the interface, the client accesses those functions directly as it would for any other com interface. A dual interface is simply idispatch with functions pasted onto the end. Idispatch builds on iunknown adding the facility to discover at runtime the attributes and interfaces supported by the specified com object.
Dual interface cards combi cards universal smart cards. You might wonder how a single interface can expose the. In the case of dispinterface call goes through idispatch invoke method used in scripts or in the absence of the interface description see remarks. An example of a dual interface desktop reader would be the identive cloud 4700f. Dual interface cards cardlogix offers a wide range of dual interface and hybridcombination smart card options.
Chip card processing dualinterface terminal visa usa. Smart cards contact, contactless, dual interface and. The idispatch interface allows client applications written in microsoft visual basic and various scripting languages to use the methods and properties exposed by iaccessible. When any interface idispatch derived or not is marked either dual or oleautomation or both it is treated specially when registertypelib is invoked which is typically done by dllregisterserver. Idispatchimpl provides a default implementation for the idispatch part of any dual interface on an object. A dual interface is really just a custom interface derived from idispatch.
Idispatchimpl provides a default implementation for the idispatch portion of any dual interface on your object. Any sense in marking an iunknownderived interface as dual in. This interface, and the marshaling code built for it, are now known as the automation facility. Dualinterface cards are widely adopted in the federal government space through both the piv and the defense departments cac cards. Idispatch is the interface that exposes the ole automation protocol. There is a definite trend toward more interest in dualinterface cards in our base, she says. The vtable of an object that implements a pure dispinterface. The fundamental reason is that the source of the event will only fire the event via the vtable or via invoke, not both. Dual interface cards are becoming more prevalent in markets that need highersecurity applications and where the cards are needed for multiple uses when the goal is to combine a traditional payment card that relies on a contact interface for merchant payments with a transit card that requires contactless, dual interface is an ideal solution. Guid0002040000000000c000000000000046 interfacetypecominterfacetype. Unlike a hybridtwin card which has two separate chips the dual interfacecombi card utilizes a single chip consisting of both interfaces.
The preferred way to implement a dispatch interface is as a dual interface. Idispatchex interface dc3 dreams advanced observatory. Like a dispinterface, a dual interface supports early binding and late binding. For each such interface an hkcr\interfaceinterfaceid key is. The most straightforward way to implement dual interface support in a ccmdtarget based class is to first implement the normal dispatch interface on your class using mfc and classwizard, then add the custom interface later. It is quite common to implement the idispatch interface this way, for example. It is expected that readers are familiar with idispatch.
Cmultidispatch multiple idispatch interfaces for automation. Dual interfaces have significant advantages over idispatch only or. A credit or debit card with an embedded chip that allows the card to be used in both contact and contactless transactions. Idispatchimpl will only support dispatch on a single dual interface. In this answer to another question concerning marshaling user voyce points to this article that basically states the following when any interface idispatchderived or not is marked either dual or oleautomation or both it is treated specially when registertypelib is invoked which is typically done by dllregisterserver. Gettypeinfocount can be 1 or 0 and represents the number of type information interfaces that the object provides gettypeinfo returns the type information for the object. You might wonder how a single interface can expose the functionality of any application. Dual interfaces make all of the invoke methods available directly, as entries in the components vtable. Dual interfaces iaccessible and idispatch win32 apps. The vtable of a dispinterface is identical to that of idispatch itself.
Implement the idispatch interface in comenabled classes that have to act as automation controllers. To use any dual interface of the object, you need to obtain the idispatch for the object, query for the desired interface and use it as usual. With a dual interface, the vtable of the interface includes the idispatch members plus any members of the custom. Use idispatchimpl for default implementation for idispatch of. An interface based solely on idispatch is called a dispinterface. If your com object implements multiple dual interfaces, either directly through. For example, listing four is a valid dual interface. In the case of dispinterface call goes through idispatchinvoke method used in scripts or in the absence of the interface description see remarks. Dual interface cards are typically used in government, id, banking and transport markets where a card with a larger memory compared to a standard contactless card, higher security and multiple interfaces is needed.
Dual interfaces iaccessible and idispatch win32 apps microsoft. For each such interface an hkcr\ interface interfaceid key is created under which 0002042400000000c0000000000000046 class is referenced as. Automation environments can only access a single idispatch interface per object which is called the default interface. Dual interface cards cardlogix offers a wide range of dualinterface and hybridcombination smart card options. Idispatchex, an extension of the idispatch interface, supports features appropriate for dynamic languages such as scripting languages.
Idispatch keeps track of methods and properties internally by a dispatch identifier dispid, which is a unique identification number for an interface member. Dual interface card development 1976458 jan 28, 2014 6. Idispatchimplex template classes for multiinterface dispatch. On dual interface cards, each interface can handle up to twenty independent logical channels. Net interoperability course at pluralsight you can sign up for a free trial subscription. You can apply the interfacetypeattribute attribute to an interface to selectively indicate that the interface should be exported as a dual interface, an iunknownderived interface, or a dispatchonly interface dispinterface.
Idispatch interface can anyone help me with the idispatch interface. Any sense in marking an iunknownderived interface as dual. While it is possible to design an event interface as a dual, there are a number of good design reasons not to do so. Often the contactless portion is used for building access, where as the contact portion is used for secure network access. The idispatch interface is the only way to access the functionality of the object.
Emv cards combat fraud activities and guard insightful payment data stored in the cards. Dual interfaces enable com clients to choose between early and late binding. Through idispatch, a controller retrieves the objects type information for the dispatch interface and then maps interface member names to specific dispids. Clients fall into roughly 2 camps of unequal capability. Automation in delphi com programming defining automation.
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