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IDataObject::GetDataHere method (objidl.h)

  • Artykuł

Called by a data consumer to obtain data from a source data object. This method differs from the GetData method in that the caller must allocate and free the specified storage medium.

Syntax

HRESULT GetDataHere(
  [in]      FORMATETC *pformatetc,
  [in, out] STGMEDIUM *pmedium
);

Parameters

[in] pformatetc

A pointer to the FORMATETC structure that defines the format, medium, and target device to use when passing the data. Only one medium can be specified in tymed, and only the following values are valid: TYMED_ISTORAGE, TYMED_ISTREAM, TYMED_HGLOBAL, or TYMED_FILE.

[in, out] pmedium

A pointer to the STGMEDIUM structure that defines the storage medium containing the data being transferred. The medium must be allocated by the caller and filled in by GetDataHere. The caller must also free the medium. The implementation of this method must always supply a value of NULL for the punkForRelease member of the STGMEDIUM structure to which this parameter points.

Return value

This method returns S_OK on success. Other possible values include the following.

Return code Description
DV_E_LINDEX
 The value for lindex is not valid; currently, only -1 is supported.
DV_E_FORMATETC
 The value for pformatetc is not valid.
DV_E_TYMED
 The tymed value is not valid.
DV_E_DVASPECT
 The dwAspect value is not valid.
OLE_E_NOTRUNNING
 The object application is not running.
STG_E_MEDIUMFULL
 An error occurred when allocating the medium.
E_UNEXPECTED
 An unexpected error has occurred.
E_INVALIDARG
 The dwDirection parameter is not valid.
E_OUTOFMEMORY
 There was insufficient memory available for this operation.

Remarks

The GetDataHere method is similar to IDataObject::GetData, except that the caller must both allocate and free the medium specified in pmedium. GetDataHere renders the data described in a FORMATETC structure and copies the data into that caller-provided STGMEDIUM structure. For example, if the medium is TYMED_HGLOBAL, this method cannot resize the medium or allocate a new hGlobal.

Some media are not appropriate in a call to GetDataHere, including GDI types such as metafiles. The GetDataHere method cannot put data into a caller-provided metafile. In general, the only storage media it is necessary to support in this method are TYMED_ISTORAGE, TYMED_ISTREAM, and TYMED_FILE.

When the transfer medium is a stream, OLE makes assumptions about where the data is being returned and the position of the stream's seek pointer. In a GetData call, the data returned is from stream position zero through just before the current seek pointer of the stream (that is, the position on exit). For GetDataHere, the data returned is from the stream position on entry through just before the position on exit.

Requirements

Requirement Value
Minimum supported client Windows 2000 Professional [desktop apps only]
Minimum supported server Windows 2000 Server [desktop apps only]
Target Platform Windows
Header objidl.h

See also

IDataObject