# CoIsOle1Class

Determines if a given CLSID represents an OLE 1 object.

BOOL CoIsOle1Class(

REFCLSID rclsid | //CLSID to check
); |

Parameter

rclsid
  [in] CLSID to check.

Return Values

S_TRUE
  CLSID refers to an OLE 1 object.
S_FALSE
  CLSID does not refer to an OLE 1 object.

Remarks

CoIsOle1Class determines whether an object class is from OLE 1. You can use it to prevent linking to embedded OLE 1 objects within a container, which OLE 1 objects do not support. Once a container has determined that copied data represents an embedded object, the container code can call CoIsOle1Class to determine whether the embedded object is an OLE 1 object. If CoIsOle1Class returns S_TRUE, the container does not offer CF_LINKSOURCE as one of its clipboard formats. This is one of several OLE compatibility functions. Other compatibility functions, listed below, can be used to convert the storage formats of objects between OLE 1 and OLE.

See Also

OleConvertIStorageToOLESTREAM, OleConvertIStorageToOLESTREAMEx, OleConvertOLESTREAMToIStorage, OleConvertOLESTREAMToIStorageEx