IiopObjectListen Function

Action

Sets up a callback to listen for incoming requests. Such requests are answered with a reply containing the parameters set on the object handle before calling the IiopObjectListen function. This function must be called for each operation that is supposed to be answered.

Optionally the callback can be re-routed to a native function exported by a so-called IIOP extension dll.

Include file

IIOP.bdh

Syntax

IiopObjectListen( in hIiop      : number,
                  in sOperation : string,
                  in sDllName   : string optional,
                  in sDllFunc   : string optional ): boolean;

Return value

true if successful
false otherwise

Parameter	Description
hIiop	Handle to a CORBA object.
sOperation	Name of operation to be answered.
sDllName	Name of the callback extension dll (optional).
sDllFunc	Name of the native function that is called whenever a callback occurs (optional).

Example

const
  LOCALHOST := "192.55.21.188";
  DAEMONPORT := 1570;
  REMOTEHOST := "192.55.21.192";
var
  ghDaemon, ghRemoteServer, ghCallback: number;

dcltrans
  transaction TMain
  begin
    IiopSetMaxGiopVersion("1.2");
    IiopSetByteOrder(IIOP_BIG_ENDIAN);
    ghDaemon       := IiopOrbixDaemonBind(LOCALHOST, DAEMONPORT);
    ghRemoteServer := IiopOrbixServerBind(ghDaemon, REMOTEHOST, "remote", "", "remote");

   // set up callback object
    IiopObjectCreate(ghCallback, "IDL:DemoObject:1.0", "1.2", LOCALHOST, 0,
      "\h3A5C6D69746368656C6C2E7365677565"
      "\h6175743A2D3838393233363930343A30"
      "\h3A3A4946523A6C6F63616C00");
    IiopObjectSetInterface(ghCallback, "IDL:local:1.0");
    IiopObjectListen(ghCallback, "callback_func");
    IiopSetObject(ghRemoteServer, ghCallback);
    IiopRequest(ghRemoteServer, "func", IIOP_ONEWAY);
    // enable the user to answer callbacks.
    wait(20.0);
    IiopObjectRelease(ghRemoteServer);
    IiopObjectRelease(ghCallback);
  end TMain;

Sample scripts

Callback.bdf

You can find the sample script(s) here: <Public documents>\Silk Performer <version>\Samples\Corba