Method Signature for multiple return values

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Method Signature for multiple return values

proxy.getInterface

asked 2014-05-31 15:37:36 -0800

Anonymous

updated 2014-06-02 11:55:02 -0800

georgen
1719 ●7 ●13

For a method such as

<method name='GetAllIDs'>"
     <arg name='responseCode' type='u' direction='out'/>"
     <arg name='IDs' type='as' direction='out'/>"
</method>"

Java interface...

public interface ServiceDescriptionBusInterface
{
…
public class GetAllIDsValues {
    @Position(0) public int responseCode;
    @Position(1) public String[] IDs;
}
…

@BusMethod(replySignature="ias")
public GetAllIDsValues GetAllIDs() throws BusException;

…
GetAllIDsValues result = new GetAllIDsValues();
result.IDs = new String[];

//this crashes...
result = proxy.getInterface(ServiceDescriptionBusInterface.class).GetAllIDs();

The code above is getting "java.lang.StringIndexOutOfBoundsException: length=1; regionStart=2; regionLength=-2” at proxy.getInterface. Is my bus method signature correct?

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Accepted Answer

2

answered 2014-06-02 12:04:10 -0800

georgen
1719 ●7 ●13

Your signature should be:

//note the signature matches the actual AllJoyn interface not the Java responseCode type
@BusMethod(replySignature="uas") 
public GetAllIDsValues GetAllIDs() throws BusException;

AllJoyn methods support unsigned types. While Java does not. Since Java does not support unsigned types you are forced to place the unsigned type into a container that only supports a Signed type. This is something you must be aware of. If the value returned that is larger then the maximum value supported by Java Integers (Integer.MAX_VALUE = 2147483647) then the responseCode should be long not int.

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