public bool ViewItem(string opcid)
{
try
{
RemoveItem(); // first remove previous item if any
itmHandleClient = 1234;
OPCItemDef[] aD = new OPCItemDef[1];
aD[0] = new OPCItemDef(opcid, true, itmHandleClient, VarEnum.VT_EMPTY);
OPCItemResult[] arrRes;
theGrp.AddItems(aD, out arrRes);
if (arrRes == null)
{
return(false);
}
if (arrRes[0].Error != HRESULTS.S_OK)
{
return(false);
}
btnItemMore.Enabled = true;
itmHandleServer = arrRes[0].HandleServer;
itmAccessRights = arrRes[0].AccessRights;
itmTypeCode = VT2TypeCode(arrRes[0].CanonicalDataType);
txtItemID.Text = opcid;
txtItemDataType.Text = DUMMY_VARIANT.VarEnumToString(arrRes[0].CanonicalDataType);
if ((itmAccessRights & OPCACCESSRIGHTS.OPC_READABLE) != 0)
{
int cancelID;
theGrp.Refresh2(OPCDATASOURCE.OPC_DS_DEVICE, 7788, out cancelID);
}
else
{
txtItemValue.Text = "no read access";
}
if (itmTypeCode != TypeCode.Object) // Object=failed!
{
// check if write is premitted
if ((itmAccessRights & OPCACCESSRIGHTS.OPC_WRITEABLE) != 0)
{
btnItemWrite.Enabled = true;
}
}
}
catch (COMException)
{
MessageBox.Show(this, "AddItem OPC error!", "ViewItem", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return(false);
}
return(true);
}
public void TestVarEnumToString01()
{
System.Runtime.InteropServices.VarEnum varEnum = (System.Runtime.InteropServices.VarEnum)DUMMY_VARIANT.VT_ILLEGAL;
//Test Procedure Call
string str = DUMMY_VARIANT.VarEnumToString(varEnum);
//Post Condition Check
Assert.AreEqual("VT_ILLEGAL", str);
//test
varEnum = (System.Runtime.InteropServices.VarEnum)DUMMY_VARIANT.VT_ARRAY;
//Test Procedure Call
str = DUMMY_VARIANT.VarEnumToString(varEnum);
//Post Condition Check
Assert.AreEqual("VT_ARRAY | VT_EMPTY", str);
//test
varEnum = (System.Runtime.InteropServices.VarEnum)DUMMY_VARIANT.VT_BYREF;
//Test Procedure Call
str = DUMMY_VARIANT.VarEnumToString(varEnum);
//Post Condition Check
Assert.AreEqual("VT_BYREF | VT_EMPTY", str);
//test
varEnum = (System.Runtime.InteropServices.VarEnum)DUMMY_VARIANT.VT_VECTOR;
//Test Procedure Call
str = DUMMY_VARIANT.VarEnumToString(varEnum);
//Post Condition Check
Assert.AreEqual("VT_VECTOR | VT_EMPTY", str);
//test
varEnum = (System.Runtime.InteropServices.VarEnum)DUMMY_VARIANT.VT_TYPEMASK;
//Test Procedure Call
str = DUMMY_VARIANT.VarEnumToString(varEnum);
//test
varEnum = System.Runtime.InteropServices.VarEnum.VT_I4;
//Test Procedure Call
str = DUMMY_VARIANT.VarEnumToString(varEnum);
//Post Condition Check
Assert.AreEqual("VT_I4", str);
}
public void ListAllProperties(ref OpcServer theSrv, string itemid)
{
listPropsView.Items.Clear();
string[] istrs = new string[5];
OPCProperty[] props;
OPCPropertyData[] propdata;
int[] propertyIDs = new int[1];
OPCPropertyItem[] propitm;
try
{
theSrv.QueryAvailableProperties(itemid, out props);
if (props == null)
{
return;
}
foreach (OPCProperty p in props)
{
istrs[0] = p.PropertyID.ToString();
istrs[1] = p.Description;
istrs[2] = DUMMY_VARIANT.VarEnumToString(p.DataType);
istrs[3] = "";
istrs[4] = "";
propertyIDs[0] = p.PropertyID;
theSrv.GetItemProperties(itemid, propertyIDs, out propdata);
if (propdata != null)
{
if (propdata[0].Error != HRESULTS.S_OK)
{
istrs[3] = "!Error 0x" + propdata[0].Error.ToString("X");
}
else
{
istrs[3] = propdata[0].Data.ToString();
}
}
if (p.PropertyID > 6)
{
theSrv.LookupItemIDs(itemid, propertyIDs, out propitm);
if (propitm != null)
{
if (propitm[0].Error != HRESULTS.S_OK)
{
istrs[4] = "!Error 0x" + propitm[0].Error.ToString("X");
}
else
{
istrs[4] = propitm[0].newItemID;
}
}
}
listPropsView.Items.Add(new ListViewItem(istrs));
}
}
catch (COMException)
{
MessageBox.Show(this, "QueryAvailableProperties failed!", "Item Properties", MessageBoxButtons.OK, MessageBoxIcon.Warning);
return;
}
// preselect top item in ListView
listPropsView.Items[0].Selected = true;
}
public override string ToString()
{
return(string.Concat(new object[] { "ID:", this.PropertyID, " '", this.Description, "' T:", DUMMY_VARIANT.VarEnumToString(this.DataType) }));
}
public override string ToString()
{
return("ID:" + PropertyID + " '" + Description + "' T:" + DUMMY_VARIANT.VarEnumToString(DataType));
}