Re: Win32::OLE error

Try turning the last parameter to your OPCItemWrite call into a string. Some servers are sensitive to the actual type of the data in the variant. I think you might have tried that though.

Someone else had a similar problem, he started out with this code (which gave the error):

use Win32::OLE::OPC;
use CGI qw(:all);
$opcintf = Win32::OLE::OPC->new('OPC.Automation','hci.phd');
$group = $opcintf->OPCGroups->Add('sanitize_mode');
$items = $group->OPCItems();
$reset_item = $items->AddItems("6440SAN2.PV", 999);
$reset_item->Write('SANITIZE');
[download]

and this is the code once he got it working:

use Win32::OLE::OPC;
use CGI qw(:all);
$opcintf = Win32::OLE::OPC->new('OPC.Automation','hci.phd');
$group = $opcintf->OPCGroups->Add('san_grp');
my $items = $group->OPCItems;
$items->AddItem(  '6440SAN2.PV', 0 );
$item = $items->Item(1);
$item->Write('NORMAL');
[download]

You don't show how you are creating the groups, that might have something to do with it.

Comment on Re: Win32::OLE error Select or Download Code

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Re^2: Win32::OLE error by Anonymous Monk on Oct 18, 2007 at 06:42 UTC
I was just trying this as well with the same problem. Since most of the values I am trying to write are VT_R4, I changed the line 1559 in the OPC.pm module from: my $value = Variant(VT_VARIANT\|VT_BYREF, shift); to my $value = Variant(VT_R4\|VT_BYREF, shift); and voila!! it works fine. And this mod begs the question, What about other types?...	[reply]
Re^2: Win32::OLE error by Anonymous Monk on Oct 18, 2007 at 06:48 UTC
Since most OPC servers are pretty good at doing the type conversions, try changing the VT_R4 described previously to VT_BSTR. That should take your scalar value as a number or string and pass it to the OPC Server as a string. The OPC server should then be able to decode it back to whatever it needs. It worked with my OPC Server that expected VT_R4 data.	[reply]