/// <summary>
/// Creates an enumerator for the current browse position.
/// </summary>
/// <param name="branches">if set to <c>true</c> then browse branches.</param>
/// <returns>The wrapped enumerator.</returns>
private EnumString CreateEnumerator(bool branches)
{
IEnumString unknown = null;
string methodName = "IOPCHDA_Browser.GetEnum";
try
{
IOPCHDA_Browser server = BeginComCall <IOPCHDA_Browser>(methodName, true);
OPCHDA_BROWSETYPE browseType = OPCHDA_BROWSETYPE.OPCHDA_ITEMS;
if (branches)
{
browseType = OPCHDA_BROWSETYPE.OPCHDA_BRANCH;
}
server.GetEnum(browseType, out unknown);
}
catch (Exception e)
{
ComCallError(methodName, e);
return(null);
}
finally
{
EndComCall(methodName);
}
// wrapper the enumrator. hardcoding a buffer size of 256.
return(new EnumString(unknown, 256));
}
private EnumString GetEnumerator(bool isBranch)
{
try
{
OPCHDA_BROWSETYPE dwBrowseType = isBranch ? OPCHDA_BROWSETYPE.OPCHDA_BRANCH : OPCHDA_BROWSETYPE.OPCHDA_LEAF;
IEnumString ppIEnumString = null;
m_browser.GetEnum(dwBrowseType, out ppIEnumString);
return(new EnumString(ppIEnumString));
}
catch (Exception e)
{
throw OpcCom.Interop.CreateException("IOPCHDA_Browser.GetEnum", e);
}
}