IPropertyStore::GetValue method

Gets data for a specific property.

Syntax

HRESULT GetValue(
  [in]  REFPROPERTYKEY key,
  [out] PROPVARIANT    *pv
);

Parameters

• key [in]
  Type: REFPROPERTYKEY

  A reference to the PROPERTYKEY structure retrieved through IPropertyStore::GetAt. This structure contains a unique identifier for the property in question.

• pv [out]
  Type: PROPVARIANT*

  When this method returns, contains a PROPVARIANT structure that contains the property data.

Return value

Type: HRESULT

Returns S_OK or INPLACE_S_TRUNCATED if successful, or an error value otherwise.

INPLACE_S_TRUNCATED is returned to indicate that the returned PROPVARIANT was coerced to a more canonical form, for instance to trim leading or trailing spaces from a string value. Most code should use the SUCCEEDED macro to check the return value, which treats INPLACE_S_TRUNCATED as a success code.

Remarks

If the PROPERTYKEY referenced in key is not present in the property store, this method returns S_OK and the vt member of the structure pointed to by pv is set to VT_EMPTY.

File property handler implementers can use IPropertyStore::GetValue to retrieve the property value by using the filestream with which Initialize initialized the property handler. The value can also be computed from an in-memory cache, or other means. However, most consumers of the property system obtain IPropertyStore through GetPropertyStore and are not—and have no need to be—aware of the method of initialization.

Requirements