RPC HELP DLL GuideLines C Execute RPCs

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DLL Interface Home C: Execute RPCs If you can make a successful connection to the RPC Broker VistA M Server, and create an application context, you can execute any RPCs registered to your context. To execute RPCs from your C program:

1. Create a character buffer large enough to hold your RPC's return value: static char Value [1024];

2. Set the RemoteProcedure property of the TRPCBroker component to the RPC to execute:

RPCBPropSet(RPCBroker, "RemoteProcedure","XWB GET VARIABLE VALUE");

3. Set the Param values for any parameters needed by the RPC. In the following example, one TRPCBroker Param node is set (the equivalent of Param[0]):

3a. A value of 0 for parameter 2 denotes the integer index of the Param node being set (Param[0]).

3b. A value of reference for parameter 3 denotes the setting for the equivalent of Param[0].PType. This uses the enumerated values for PType declared in the header file.

3c. A value of "DUZ" for parameter 4 denotes that the equivalent of Param[0].Value is "DUZ": RPCBParamSet(RPCBroker, 0, reference, "DUZ");

4. Use the RPCBCall method to execute the RPC: RPCBCall(RPCBroker, Value); The return value from the RPC is returned in the second parameter (in this case, the Value character buffer).