You can just update it in your next release. I will go ahead and just create a new instance every time. I am critical for speed on this application. We create a serialized inflator for the automobile industry and we gather critical data every sec from the machines as they build the inflators. So if you have any suggestions on things to do to interact faster with the opc server via the opclabs client I would appreciate the suggestions.


Thanks for all your quick repsonses!!

Ok I did some more testing and captured as much as Powerbuilder lets me.

In my local function of_model_list I did this..
ll_rowcount = g_msg94_recv.msg_opclabs_handles.count()
g_msg94_recv.msg_opclabs_handles.clear()
ll_rowcount = g_msg94_recv.msg_opclabs_handles.count()
the first time I call ll_rowcount = 0 before and after the clear.

Then I load up the vector with all the data and call count again

for ll_idx = 1 to ll_upper

// 02/27/0219 shp load the opc labs stuff -- load the values and put the objects up in the msg_opclabs_handles
g_msg94_recv.sta_data.opc_item_handle3[ll_idx].value = ls_model_nbr[ll_idx]
g_msg94_recv.sta_data.opc_item_handle[ll_idx].value = ls_model_id[ll_idx]
g_msg94_recv.sta_data.opc_item_handle4[ll_idx].value = len(ls_model_nbr[ll_idx])
g_msg94_recv.sta_data.opc_item_handle2[ll_idx ].value =len(ls_model_id[ll_idx] )

g_msg94_recv.msg_opclabs_handles.add(g_msg94_recv.sta_data.opc_item_handle3[ll_idx])
g_msg94_recv.msg_opclabs_handles.add(g_msg94_recv.sta_data.opc_item_handle[ll_idx])
g_msg94_recv.msg_opclabs_handles.add(g_msg94_recv.sta_data.opc_item_handle4[ll_idx])
g_msg94_recv.msg_opclabs_handles.add(g_msg94_recv.sta_data.opc_item_handle2[ll_idx])

check count
ll_rowcount = g_msg94_recv.msg_opclabs_handles.count()
ll_rowcount is now at 96 which is correct I want to write out 96 items

Call function that does the write
operationResultList = g_opclabs.WriteItemValueList(g_msg94_recv.msg_opclabs_handles)
works perfectly no issues.

Call my of_model_list function again
ll_rowcount = g_msg94_recv.msg_opclabs_handles.count()
g_msg94_recv.msg_opclabs_handles.clear()
ll_rowcount = g_msg94_recv.msg_opclabs_handles.count()

ll_rowcount = 96 before calling clear
call clear
ll_rowcount = 96 after calling clear .. It did not remove anything.

I then load the data gain which just adds onto the existing 96
and now i have 192 items after the call to count again but when I call
operationResultList = g_opclabs.WriteItemValueList(g_msg94_recv.msg_opclabs_handles)

it blows up... Here is everything powerbuilder allows me to capture
getmessage = Error calling external object function writeitemvaluelist at line 110 in function wf_opc_write of object w_plc_2_db.
text = Error calling external object function writeitemvaluelist at line 110 in function wf_opc_write of object w_plc_2_db.
description = Null element in argumentsArray.
helpfile = Null element in argumentsArray.
helpcontext = 0
number = 35

As far as I can tell the Clear method is not clearing the vector but is does something to the vector cause on my next call to write the data it blows up..

I am trying to use the same vector over and over and load different DAItemValueArguments into the vector to call the WriteItemValueList I am doing this because each time I hit the database I can have different data to send back to the plc. I can also have different amounts of DAItemValueArguments to send back.

Everything works great the first write. I then tried to call the clear() method on the vector to empty it out and load for the next time. This does not seem to work.
What should I do to send data back. I was trying for speed purposes not recreate everything every time.

FYI I am Still on the demo code. Is this why I can only do One write?