The IOleCommandTarget interface defines a simple and extensible mechanism whereby objects and their containers can dispatch commands to each other. For example, an object’s toolbars may contain buttons for commands such as Print, Print Preview, Save, New, and Zoom. Normal in-place activation guidelines recommend that you remove or disable such buttons because no efficient, standard mechanism has been available to dispatch them to the container. Similarly, a container has heretofore had no efficient means to send commands such as Print, Page Setup, and Properties to an in-place active object. Such simple command routing could have been handled through existing OLE Automation standards and the IDispatch interface, but the overhead with IDispatch is more than is required in the case of document objects. The IOleCommandTarget interface provides a simpler means to achieve the same ends.
Available commands are defined by integer identifiers in a group. The group is identified itself with a GUID. The interface allows a caller both to query for support of one or more commands within a group and to issue an order to the object to execute a particular command.
Methods in VTable Order
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IUnknown Methods |
Description |
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QueryInterface |
Returns pointers to supported interfaces |
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AddRef |
Increments reference count |
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Release |
Decrements reference count |
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IOleCommandTarget Methods |
Description |
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Queries object for status of commands | |
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Execute a command |