S_OK

Pointers were returned to all requested interfaces.

S_FALSE

Pointers were returned to some, but not all, of the requested interfaces.

E_NOINTERFACE

Pointers were returned to none of the requested interfaces.

The QueryMultipleInterfacesmethod takes as input an array of MULTI_QIstructures. Each structure specifies an interface IID and contains two additional blank members for receiving an interface pointer and return value.

This method obtains as many requested interface pointers as possible directly from the object proxy.

For each interface not implemented on the proxy, the method calls the server to obtain a pointer.

Upon receiving an interface pointer from the server, the method builds a corresponding interface proxy and returns its pointer along with pointers to the interfaces it already implements.

To determine whether the platform supports this interface, see Determining Supported COM APIs.

A caller should begin by querying the object proxy for the IMultiQIinterface. If the object proxy returns a pointer to this interface, the caller should then create a MULTI_QIstructure for each interface it wants to obtain.

Each structure should specify an interface IID and set its pItfmember to NULL. Failure to set the pItfmember to NULL will cause the object proxy to ignore the structure.

On return, QueryMultipleInterfaceswrites the requested interface pointer and a return value into each MULTI_QIstructure in the client's array. The pItfmember receives the pointer; the hrmember receives the return value.

If the value returned from a call to QueryMultipleInterfacesis S_OK, then pointers were returned for all requested interfaces.

If the return value is E_NOINTERFACE, then pointers were returned for none of the requested interfaces.

If the return value is S_FALSE, then pointers to one or more requested interfaces were not returned. In this event, the client should check the hrmember of each MULTI_QIstructure to determine which interfaces were acquired and which were not.

If a client knows ahead of time that it will be using several of an object's interfaces, it can call QueryMultipleInterfacesup front and then, later, if a QueryInterfaceis done for one of the interfaces already acquired through QueryMultipleInterfaces, no RPC call will be necessary.

On return, the caller should check the hrmember of each MULTI_QIstructure to determine which interface pointers were and were not returned.

The client is responsible for releasing each of the acquired interfaces by calling Release.