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IPrintOemUni::PublishDriverInterface method (prcomoem.h)

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The IPrintOemUni::PublishDriverInterface method allows a rendering plug-in for Unidrv to obtain the Unidrv driver's IPrintOemDriverUni or IPrintCoreHelperUni interface.

Syntax

HRESULT PublishDriverInterface(
  IUnknown *pIUnknown
);

Parameters

pIUnknown

Caller-supplied pointer to the IUnknown interface of the driver's IPrintOemDriverUni COM Interface or IPrintCoreHelperUni interface.

Return value

The method must return one of the following values.

Return code Description
S_OK
 The operation succeeded.
E_FAIL
 The operation failed.

Remarks

A rendering plug-in for Unidrv must implement the IPrintOemUni::PublishDriverInterface method, and the method must return S_OK in response to at least one call. Otherwise, the driver will not call the plug-in's other IPrintOemUni interface methods.

The method should return information on its supported Unidrv interfaces as follows:

  1. The Unidrv driver first calls the IPrintOemUI::PublishDriverInterface method with the pIUnknown pointer set to the IPrintOemDriverUni instance's IUnknown interface. If the rendering plug-in will be calling IPrintOemDriverUni interface methods, it must use the received IUnknown interface pointer to call IUnknown::QueryInterface (described in the Microsoft Windows SDK documentation) in order to obtain a pointer to the driver's supported version of the IPrintOemDriverUni interface. For more information, see Interface Identifiers for Printer Drivers.
  2. If the plug-in's IPrintOemUni::GetInfo method has returned a value of OEMPUBLISH_IPRINTCOREHELPER in pBuffer in response to a call with dwMode set to OEMGI_GETREQUESTEDHELPERINTERFACES, the Unidrv driver calls the IPrintOemUni::PublishDriverInterface method again, but with the pIUnknown pointer set to an object that implements the IPrintCoreHelperUni and IPrintCoreHelper interfaces. If the plug-in retains a pointer to the object, the method should return S_OK. Otherwise, the method should return E_FAIL.

Requirements

Requirement Value
Target Platform Desktop
Header prcomoem.h (include Prcomoem.h)

See also

IPrintOemUni

IPrintOemUni::GetInfo