Note: this is still work in progress. Library works with named pipes and can be connected to MSFS2020. New protocol features are missing.
jSimConnect is a java implementation of a simconnect client library. SimConnect is a client/server architecture that enables add-ons developpers to communicate with a running instance of Microsoft Flight Simulator X.
jSimConnect is distributed under the terms of the LGPL license.
Simply drop jsimconnect.jar into your project. Don't forget to add it to your classpath.
SimConnect use network sockets (TCP/IP) to communicate with the server, you should allow it in your security profiles (if you use one)
Please refer to the javadoc included in this package in the doc/ subdirectory. The main. Most functions prototypes and communications concepts are similar to the Microsoft implementation, so the SDK documentation is also a very good help.
Some samples are included in the samples/ directory.
A technical documentation about the simconnect protocol (independant of jSimConnect) is providen in the package-doc page for the flightsim.jsimconnect package. Browse the javadoc to this package index to access it.
SimConnect uses a TCP connection to communicate with the running instance of Flight Simulator. The client side application have to guess connection parameters (address, port and IP version). The socket parameters can be changed in simconnect.xml on the server side, the default behaviour is to choose a random port, listen only loopback (127.0.0.1) interface and write the value of the choosen port to the registry database. Beginning with 0.6, jsimconnect provides small helper methods to guess the correct port to use by simconnect (by reading the registry values); see Configuration#findSimConnectPort
FSX SP2 introduced new transport protocol (using proprietary windows pipes), but are unsupported by jsimconnect.
Most jsimconnect methods using integers as request identifiers are overriden to accept Enum class (thus user-defined enumerations). However responses structures are only providing integers, use the ordinal() method to compare them to your enumerations, i.e. :
if (res.getRequestId() == MyEnum.MyID.ordinal()) {
// code
}Integer <-> Enum constant transtyping is not natural in java, so it's better to provide your own methods. Since you can define new methods in enumeration, one could use :
enum MyEnum {
MyID1,
MyID2;
public boolean isEvent(RecvEvent re) {
return ordinal() == re.getEventID();
}
}NB: does not deal with IP (4 or 6) protocol !
When using a simconnect instance, some constructors accepts a protocol version number. These version indicates the simconnect protocol to emulate when talking to the remote FSX. The different FSX updates included new features to the simconnect protocol & client library, but also broke backward compatibility when the simconnect client is newer than the remote Flight Simulator instance. In the MS Implementation, this is resolved by statically linking (with or without a manifest) the client application to a specific version of the library installed in the Side-by-Side repository.
JSimconnect uses the version given to the constructor to emulate an older simconnect protocol client, thus allowing to connect to older FSX versions. Note that by default, the protocol number used is the most up to date, and consequently a VERSION_MISMATCH exception will be received upon connecting to older FSX version.
As of jsimconnect 0.7 the supported protocol numbers are :
- 0x2 (RTM version). Note that 0x1 (possibly from fsx beta) is not supported
- 0x3 (SP1).
- 0x4 (SP2/Acceleration)
When specifying a protocol version to emulate, some functions will be inhibited as they may not be available in the current version. For instance modeless UI, are not available before SP1. Constructing a simconnect instance emulating protocol 0x2 will systematically throw an UnsupportedOperationException exception when calling this methods.
A major feature used by C/C++/C# implementation of simconnect client
libraries is the ability to directly cast a memory block to an
user-defined structure. This is technically impossible to do in Java
since memory layout of classes is not accessible.
Consequently the wrapping/unwrapping steps should be done by the user.
The base class RecvSimObjectData provides various methods for reading
primitives types and FS-specified compounds types from packets.
The general guidelines for transforming C/C++ applications looks like:
// ---------- C
struct MyStruct {
int a;
float b;
int c;
};
// ...
struct MyStruct *pS;
pS = (struct MyStruct *) &pData->dwData;
printf("%d %f\n", pS->a, ps->b);
// ....// ---------- Java
class MyClass {
int a;
float b;
int c;
};
// ...
MyClass mc = new MyClass();
mc.a = recvPacket.getInt32();
mc.b = recvPacket.getFloat32();
mc.c = recvPacket.getInt32();
System.out.println(mc.a + " " + mc.b);
// ... Compound data (like InitPosition, Waypoint or LatLonAlt) can also be
read directly.
The counterpart for writing complex data (used by SetDataOnSimObject
or SetClientData) is the DataWrapper class.
The base method for reading responses sent by the server is the callDispatch(Dispatcher) method of the SimConnect class.
Since the Dispatcher interface receives unparsed data from network
buffers, you should not directly implement this method yourself.
Instead two different implementations are available, the AbstractDispatcher
(C - like) and DispatcherTask (listeners).
- AbstractDispatcher is an abstract class that reads received data
and construct the appropriate Recv* class. A subclass of
AbstractDispatchermust implementonDispatch()and generally proceeds to a large switch-block with different IDs:
class MyApp extends AbstractDispatcher {
public void onDispatch(SimConnect simConnect, RecvPacket recv) {
switch (recv->getID()) {
case RecvID.ID_EXCEPTION:
RecvException re = (RecvException) recv;
// ...
case RecvID.ID_EVENT:
RecvEvent event = (RecvEvent) recv;
// ...
}
}
}DispatcherTaskhas a list of listeners for each packet type and follows the general event-subscription pattern of Java. One should provides a class implementing an Handler interface and subscribe it to the appropriateDispatcher.
DispatcherTask dispatcher;
dispatcher.addEventHandler(new EventHandler() {
public void handleEvent(RecvEvent re) {
System.out.println("Received Event [" + re.getEventID() + "]");
}
});
simconnect.callDispatch(dispatcher);DispatcherTask can be passed to the simconnect instance to parse each meassage
separately, but it can also be run in its own thread; e.g. :
DispatcherTask dispatcher = new DispatcherTask(simconnect);
dispatcher.addEventHandler(...);
dispatcher.addXXXHandler(...);
dispatcher.createThread().start();All handlers will be run from the dispatcher thread. Note that the
DispatcherTask implements Runnable, so you can use your thread creation
method
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