/// <summary>
/// Converts a NodeType value to the OPCAEBROWSETYPE equivalent.
/// </summary>
internal static OpcRcw.Ae.OPCAEBROWSETYPE GetBrowseType(Technosoftware.DaAeHdaClient.Ae.TsCAeBrowseType input)
{
switch (input)
{
case Technosoftware.DaAeHdaClient.Ae.TsCAeBrowseType.Area: return(OpcRcw.Ae.OPCAEBROWSETYPE.OPC_AREA);
case Technosoftware.DaAeHdaClient.Ae.TsCAeBrowseType.Source: return(OpcRcw.Ae.OPCAEBROWSETYPE.OPC_SOURCE);
}
return(OpcRcw.Ae.OPCAEBROWSETYPE.OPC_AREA);
}
/// <summary>
/// Populates the tree with the elements within the specified area.
/// </summary>
private void BrowseArea(TreeNodeCollection nodes, Technosoftware.DaAeHdaClient.Ae.TsCAeBrowseType browseType, Technosoftware.DaAeHdaClient.Ae.TsCAeBrowseElement area)
{
IOpcBrowsePosition position = null;
try
{
// fetch first batch of elements.
Technosoftware.DaAeHdaClient.Ae.TsCAeBrowseElement[] elements = mServer_.Browse(
area?.QualifiedName,
browseType,
mBrowseFilter_,
mMaxElements_,
out position);
do
{
// add elements to tree.
for (int ii = 0; ii < elements.Length; ii++)
{
// create node.
TreeNode node = new TreeNode(elements[ii].Name)
{
ImageIndex = (browseType == Technosoftware.DaAeHdaClient.Ae.TsCAeBrowseType.Area) ? Resources.IMAGE_CLOSED_BLUE_FOLDER : Resources.IMAGE_GREEN_SCROLL,
SelectedImageIndex = (browseType == Technosoftware.DaAeHdaClient.Ae.TsCAeBrowseType.Area) ? Resources.IMAGE_OPEN_BLUE_FOLDER : Resources.IMAGE_GREEN_SCROLL,
Tag = elements[ii]
};
// add dummy child to ensure '+' sign is visible.
node.Nodes.Add(new TreeNode());
// add to tree.
nodes.Add(node);
}
// check if browse is complete.
if (position == null)
{
break;
}
// prompt to continue browse.
DialogResult result = MessageBox.Show(
"More elements meeting search criteria exist. Continue browse?",
"Browse " + browseType + "s",
MessageBoxButtons.YesNo);
if (result == DialogResult.No)
{
break;
}
// continue browse.
elements = mServer_.BrowseNext(mMaxElements_, ref position);
}while (true);
}
finally
{
// dipose position object on exit.
if (position != null)
{
position.Dispose();
position = null;
}
}
}
