Data Interfaces

External RFC Program: Client
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RfcOpen(...);
...
RfcCall(...);
...
RfcReceive(...);
...
RfcCall(...);
...
RfcReceive(...);
...
RfcClose(...);
}RfcCallReceive (...);
The above program is an RFC client program, i.e. it initiates a communication and connects to the RFC
server program.
RfcOpen sets up a connection to the partner system (INIT, ALLOCATE, LOGON). You are then
logged on to the SAP system.
RfcCall calls a function module (SAP system) or a function (external system) and transfers parameters
and tables.
RfcReceive allows you to receive replies after RfcCall has been called. RfcReceive waits until a reply
has been received.
Instead of RfcCall and RfcReceive, you can use a function called RfcCallReceive.
RfcClose closes the conversation with the partner system.
Between a CALL and a RECEIVE you can always use a RfcLists. This tells you whether a function has
been processed or whether the connection is still open.
You pass connection parameters via RfcOpen (at least the client, user name and password) or a side
information file. From Release 3.0, you should use saprfc.ini as the side information file. You can also
use the following features:
--> Addressing R/3 via load balancing (specify the message server)
--> An external server program can be registered at an SAP gateway
(--> Demon). This saves the start time usually required (performance option).