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KIX PORTABLE APP WRAPPER CODE
The IDispatchEx interface is an extension of the IDispatch interface that, unlike IDispatch, enables enumeration, addition, deletion, and case-sensitive calling of members.Įnables COM types that support enumerations to be treated as collections.Calculator code in javascript.
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If the class implements IDispatchEx, the RCW implements IExpando. The RCW converts objects that expose the connection-point event style to delegate-based events. IConnectionPoint and IConnectionPointContainer The RCW optionally consumes the interfaces listed in the following table, which are exposed by the object it wraps. Lifetime management Using the QueryInterface method, the RCW gets and holds a reference to an unmanaged object until the runtime performs garbage collection on the wrapper, which releases the unmanaged object. Type coercion The RCW recognizes the dynamic type discovery performed by the QueryInterface method. If the COM object being wrapped implements IProvideClassInfo, the RCW extracts the type information from this interface to provide better type identity.įor object identity, type coercion, and lifetime management: - Object identity The runtime distinguishes between COM objects by comparing the value of the IUnknown interface for each object. Provides a textual description of the error, its source, a Help file, Help context, and the GUID of the interface that defined the error (always GUID_NULL for. If your USB flash drive already boots fine natively, it. Next, select the existing LiveLinux Entry, and then click Start. Navigate to the VirtualBox folder on your USB device and click VirtualBox.exe. Interfaceįor late binding to COM objects through reflection. Then, extract the contents from the zipped file to your flash drive. The RCW consumes the interfaces listed in the following table, which are exposed by the object it wraps. Further, the RCW exposes all members of the INew interface to the. In the illustration, the RCW exposes the INew interface but consumes the IUnknown and IDispatch interfaces. It implements the interfaces that the COM object implements and exposes the methods, properties, and events from the object's interfaces. When created as an early-bound object, the RCW is a specific type. The following image shows COM interfaces and the runtime callable wrapper: NET client, as shown in the following illustration. To create a seamless transition, the RCW consumes selected COM interfaces without exposing them to the. The primary goal of the runtime callable wrapper (RCW) is to hide the differences between the managed and unmanaged programming models. For instance, a standard wrapper will always pass a 4-byte integer between managed and unmanaged code without converting the type. Both the client and the server send and receive data that is familiar to them. Should the COM object return a BSTR to its managed caller, the caller receives a string. NET client passes a string type as part of an argument to an unmanaged object, the wrapper converts the string to a BSTR type. The standard wrapper enforces built-in marshalling rules. Specifically, the RCW provides marshalling for method arguments and method return values whenever the client and server have different representations of the data passed between them. The runtime performs garbage collection on the RCW.Īmong other activities, the RCW marshals data between managed and unmanaged code, on behalf of the wrapped object. Each RCW maintains a cache of interface pointers on the COM object it wraps and releases its reference on the COM object when the RCW is no longer needed. Using metadata derived from a type library, the runtime creates both the COM object being called and a wrapper for that object. The following image shows the process for accessing COM objects through the runtime callable wrapper: As the following illustration shows, any number of managed clients can hold a reference to the COM objects that expose INew and INewer interfaces.
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Note that this proxy is a new managed object and not the same as the initial RCW this means the two managed objects are not equal but do represent the same COM object. If you create an RCW in one application domain or apartment, and then pass a reference to another application domain or apartment, a proxy to the first object will be used. The runtime maintains a single RCW per process for each object. The runtime creates exactly one RCW for each COM object, regardless of the number of references that exist on that object. NET clients, its primary function is to marshal calls between a. Although the RCW appears to be an ordinary object to. The common language runtime exposes COM objects through a proxy called the runtime callable wrapper (RCW).