DataObject.IDataObject.GetCanonicalFormatEtc(FORMATETC, FORMATETC) Method

Definition

Provides a standard FORMATETC structure that is logically equivalent to a more complex structure. Use this method to determine whether two different FORMATETC structures would return the same data, removing the need for duplicate rendering.

 virtual int System.Runtime.InteropServices.ComTypes.IDataObject.GetCanonicalFormatEtc(System::Runtime::InteropServices::ComTypes::FORMATETC % pformatetcIn, [Runtime::InteropServices::Out] System::Runtime::InteropServices::ComTypes::FORMATETC % pformatetcOut) = System::Runtime::InteropServices::ComTypes::IDataObject::GetCanonicalFormatEtc;
int IDataObject.GetCanonicalFormatEtc (ref System.Runtime.InteropServices.ComTypes.FORMATETC pformatetcIn, out System.Runtime.InteropServices.ComTypes.FORMATETC pformatetcOut);
Function GetCanonicalFormatEtc (ByRef pformatetcIn As FORMATETC, ByRef pformatetcOut As FORMATETC) As Integer Implements IDataObject.GetCanonicalFormatEtc

Parameters

pformatetcIn
FORMATETC

A pointer to a FORMATETC structure, passed by reference, that defines the format, medium, and target device that the caller would like to use to retrieve data in a subsequent call such as GetData(FORMATETC, STGMEDIUM). The TYMED member is not significant in this case and should be ignored.

pformatetcOut
FORMATETC

When this method returns, contains a pointer to a FORMATETC structure that contains the most general information possible for a specific rendering, making it canonically equivalent to formatetcIn. The caller must allocate this structure and the GetCanonicalFormatEtc(FORMATETC, FORMATETC) method must fill in the data. To retrieve data in a subsequent call such as GetData(FORMATETC, STGMEDIUM), the caller uses the supplied value of formatOut, unless the value supplied is null. This value is null if the method returns DATA_S_SAMEFORMATETC. The TYMED member is not significant in this case and should be ignored. This parameter is passed uninitialized.

Returns

This method supports the standard return values E_INVALIDARG, E_UNEXPECTED, and E_OUTOFMEMORY, as well as the following:

Value Description
S_OK The returned FORMATETC structure is different from the one that was passed.
DATA_S_SAMEFORMATETC The FORMATETC structures are the same and null is returned in the formatOut parameter.
DV_E_LINDEX There is an invalid value for lindex; currently, only -1 is supported.
DV_E_FORMATETC There is an invalid value for the pFormatetc parameter.
OLE_E_NOTRUNNING The application is not running.

Implements

Remarks

This member is an explicit interface member implementation. It can be used only when the DataObject is cast to an IDataObject interface.

Applies to