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MAPI IUnknown::QueryInterface (Compact 7)

  • Article

3/12/2014

The QueryInterface method returns a pointer to a specified interface on an object to which a client currently holds an interface pointer. This method must call the MAPI IUnknown::AddRef method on the pointer it returns.

Syntax

HRESULT QueryInterface(
  REFIID iid,
  void ** ppvObject
);

Parameters

  • iid
    [in] Identifier of the interface being requested.
  • ppvObject
    [out] Address of the pointer variable that receives the interface pointer requested in iid. Upon successful return, *ppvObject contains the requested interface pointer to the object. If the object does not support the interface specified in iid, *ppvObject is set to NULL.

Return Value

  • S_OK
    Indicates that the interface specified by iid is supported, and the method returned successfully.
  • E_NOINTERFACE
    Indicates that the interface specified by iid is not supported.
  • E_NOTIMPL
    Indicates that QueryInterface is not implemented on the interface object from which it is being called.

Remarks

For more information about this method, see IUnknown::QueryInterface in the Windows Embedded Compact documentation.

Requirements

Header

unknwn.h

See Also

Reference

IUnknown for MAPI