RPC HELP DLL GuideLines C Execute RPCs
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).
