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Run OPC in a Thread
June 16, 2012
6:49, EEST
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Rainer Versteeg
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Forum Posts: 32
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March 21, 2012
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Hello !

Is it possible to create a OPCServer in A Thread ?

At the moment I initialize the OPC Server in the Inalization of a Class

initialization
coInitializeSecurity(NIL, -1, NIL, NIL, RPC_C_AUTHN_LEVEL_NONE,
RPC_C_IMP_LEVEL_IDENTIFY, NIL, EOAC_NONE, NIL);
OPCProvider := TPSOPCProvider.Create;
with OPCProvider do
begin
Autorun := true;
CLSID := ‘{4F3F0F22-36A7-4EBD-A717-D930B440F139}’;
Servername := ‘DEMiC_OPC_SERVER_V100’;
Description := ‘DEMiC OPC Server V1.00’;
Vendor := ‘DEMiC Datentechnik GmbH’;
VendorInfo := ”;
AddressSpace.IncludeProps := true;
Version := 0;
ThreadingModel := tmboth; // Default = tmBoth
ActivityLog.Active := false;
ActivityLog.MaxLines := 500;
ActivityLog.FileName := ‘Activity.log’;
OnItemAccessRights := cls_opcserver.OPCProviderItemAccessRights;
Initialize;
end;

Now i want call the above initalization in a Thread

procedure OPCThread.Execute;
begin
coInitializeex(nil, COINIT_MULTITHREADED);
While not terminated do
begin
//Inital OPC Server
end;
CoUninitialize;

Br,
Rainer

end;

June 18, 2012
7:53, EEST
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Jouni Aro
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December 21, 2011
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No, the OPCProvider must be defined in the application initialization part.

It will use the standard COM server mechanisms of Delphi and actually uses internal threads to manage the incoming calls from clients.

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