IPrintCoreUI2::EnumOptions method (prcomoem.h)

The IPrintCoreUI2::EnumOptions method enumerates the available options of a specific feature.

Syntax

HRESULT EnumOptions(
  [in]  POEMUIOBJ poemuiobj,
  [in]  DWORD     dwFlags,
  [in]  PCSTR     pszFeatureKeyword,
  [out] PZZSTR    pmszOptionList,
  [in]  DWORD     cbSize,
  [out] PDWORD    pcbNeeded
);

Parameters

[in] poemuiobj

Pointer to the current context, an OEMUIOBJ structure.

[in] dwFlags

Is reserved and must be set to zero.

[in] pszFeatureKeyword

Pointer to a caller-supplied buffer containing an ASCII string specifying a feature keyword whose options are requested.

[out] pmszOptionList

Pointer to a caller-supplied buffer that receives a NULL-delimited list, in MULTI_SZ format, containing the option keywords for the feature keyword pointed to by pszFeatureKeyword. This list is terminated with two null characters.

Set this parameter to NULL to simply query for the size (*pcbNeeded) of the option list without having the list filled in.

[in] cbSize

Specifies the size, in bytes, of the buffer pointed to by pmszOptionList.

[out] pcbNeeded

Pointer to a memory location that receives the actual size, in bytes, of the option list.

Return value

This method must return one of the following values.

Return code	Description
S_OK	The method succeeded.
E_OUTOFMEMORY	The value in cbSize was smaller than the number of bytes to be written to the output buffer (the buffer pointed to by pmszOptionList). The method was called with pmszOptionList set to NULL.
E_INVALIDARG	The string pointed to by pszFeatureKeyword is not a recognized feature. The poemuiobj parameter pointed to an invalid context object.
E_NOTIMPL	(Pscript only) The Pscript5 driver feature is not supported under the current configuration. The Pscript5 driver feature is supported under the current configuration, but the Pscript5 driver feature's options are not enumerable.
E_FAIL	The method failed

Remarks

This method is supported only for Windows XP Pscript5 plug-ins, not for Unidrv plug-ins.

To reduce the need to make two calls per data access, pass the method an output buffer of a fixed size (1 KB, for example), and then check the function return value. If the method returns S_OK, the buffer already contains the data of interest. If the method returns E_OUTOFMEMORY, the value in *pcbNeeded is the buffer size needed to hold the data of interest. The caller should then allocate a buffer of that larger size and proceed with a second call to the method.

For more information, see Using EnumOptions.

Requirements

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

See also

IPrintCoreUI2

IPrintCoreUI2::EnumFeatures

OEMUIOBJ