XRValueCollectionT.GetItem(int,Obj**) (Compact 7)
3/12/2014
This method provides a helper template version of the XRValueCollectionT.GetItem(int,ItemType *) method, which obtains the item at the specified index of the collection.
Syntax
HRESULT GetItem(
int nIndex,
Obj * * ppObj)
Parameters
- nIndex
[in] The index of the item to obtain.
- ppObj
[out] A pointer of the specified interface pointer type that points to the item at the specified index within the collection.
Return Value
The following table shows the possible return values.
| Value | Description |
|---|---|
S_OK |
The method was successful. |
E_FAIL |
The method was unsuccessful. |
E_POINTER |
The ppObj parameter is not valid. |
E_INVALIDARG |
The index location is not valid. |
Remarks
To use an interface pointer type other than ItemType, you can use the type-safe version of XRValueCollectionT.GetItem(int,ItemType *) that Silverlight for Windows Embedded provides. When you supply a derived type in ppObj, Silverlight for Windows Embedded automatically uses this type-safe method, which implicitly converts the returned type from a generic interface so that you do not have to explicitly call IUnknown::QueryInterface to convert the generic interface into the required object type.
ItemType is defined in the ItemType template parameter of the XRValueCollectionT<IFace,ItemType> class.
The index position at the beginning of the collection is 0 (zero).
Requirements
Header |
XRCollection.h |