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StorageLibraryChangeTrackerOptions コンストラクター

  • リファレンス

定義

名前空間:
Windows.Storage
編集

StorageFolder または StorageLibrary の変更トラッカーの動作を設定するために使用する StorageLibraryChangeTrackerOptions のコンストラクター。

public:
 StorageLibraryChangeTrackerOptions();
 StorageLibraryChangeTrackerOptions();
public StorageLibraryChangeTrackerOptions();
function StorageLibraryChangeTrackerOptions()
Public Sub New ()

例

// applications are expected to persist the previous value
UINT64 appsLastPersistedChangeId = StorageLibraryLastChangeId::Unknown();
StorageFolder folder = StorageFolder::GetFolderFromPathAsync(L"my folder path").get();

StorageLibraryChangeTracker tracker = folder.TryGetChangeTracker();
if (tracker != nullptr)
{
StorageLibraryChangeTrackerOptions ops;
ops.TrackChangeDetails(false);
tracker.Enable(ops);

StorageLibraryChangeReader reader = tracker.GetChangeReader();
if (reader != nullptr)
{
    UINT32 changeId = reader.GetLastChangeId();
    if ((changeId == StorageLibraryLastChangeId::Unknown())
    {
        ScanFolderSlow();
    }
    else if (changeId == 0)
    {
        // no changes in the storage folder yet, OR nothing has changed
        ProcessNormalApplicationStartup();
    }
    else if (changeId != appsLastPersistedChangeId)
    {
        // There have been new changes since we’ve last ran, process them
        appsLastPersistedChangeId = changeId;
        ScanFolderForChanges();
    }
    else
    {
        // changeId and our last persisted change id match, also normal application startup
        ProcessNormalApplicationStartup();
    }
}
}

適用対象

こちらもご覧ください