I'm working on porting a C++ library used in desktop and iOS applications to Android. I'm using SWIG to create the JNI code and I'm about 90% of the way to where I need to be. The only issue I have left is wrapping the callback functions from the C++ library.
In my main Device class, I have the following:
class Device
{
public:
void set_receive_callback(ReceiveFunctonPointer func, void *userdata);
};
The callback function and struct data have the following signature:
// enum wrapped by SWIG
enum CommandType {
...
};
// enum wrapped by SWIG
enum ValueFormat {
...
};
// Value map wrapped by SWIG
typedef std::map<int, std::string> ValueMap;
// struct to be passed back. Already wrapped into Java class by SWiG
struct DeviceReceive {
void *userdata;
CommandType command;
std::string messageId;
std::string value;
ValueFormat format;
ValueMap value_map;
Device *device;
};
// the callback function signature
typedef void (*ReceiveCallback)(DeviceReceive data);
From what I've read, I'll need to create some sort of DeviceCallback interface in Java to be used. That should be something simple like:
package my.sdk;
import my.sdk.DeviceReceive;
public interface DeviceCallback {
void handleCallback(DeviceReceive data);
}
My question is, using SWIG, how do I get from the callback, create the java DeviceReceive class from the C++ DeviceReceive struct, then call the Java callback handler. Note that the callback also occurs on a random background thread created by the C++ library.
