使用Swig的JNI for C和函数指针回调的麻烦

我们在java中加载的一个库中有一个C函数，它接受一个函数指针

function定义如下

typedef char int8 typedef unsigned short uint16 uint32 poll_broadcasts(void *(pfn)(int8*,uint16)); 

在C中，它如下使用

 void handle_broadcasts( int8 *broadcast, uint16 length ) uint32 a = poll_broadcasts( (void*(*)(int8*,uint16)) handle_broadcasts ) 

但是当您使用Swig生成JNI包装器时，它会为poll_broadcast创建以下定义

 public static long poll_broadcasts(SWIGTYPE_p_f_p_char_unsigned_short__p_void pfn) { return TestJNI.poll_broadcasts(SWIGTYPE_p_f_p_char_unsigned_short__p_void.getCPtr(pfn)); } 

按照答案
我应该如何编写.i文件来包装Java或C＃中的回调

试过下面

test.h

 void * data; typedef void* (*callback_handle_broadcast_t)(int8*, uint16); static callback_handle_broadcast_t handle_broadcast; static void set_handle_broadcast(callback_handle_broadcast_t cb, void *userdata) { handle_broadcast = cb; data = userdata; } 

Swig接口文件Test.i

 %module Test %include "cpointer.i" %include "carrays.i" %include "various.i" %include "arrays_java.i" %pointer_functions(int, intp); %pointer_functions(char, charp); %include "arrays_java.i" %include "typemaps.i" %{ #include  #include "test.h" struct callback_data { JNIEnv *env; jobject obj; }; void java_callback(int8* arg1, uint16 arg2, void *ptr) { struct callback_data *data = ptr; const jclass callbackInterfaceClass = (*data->env)->FindClass(data->env, "BroadcastCallback"); assert(callbackInterfaceClass); const jmethodID meth = (*data->env)->GetMethodID(data->env, callbackInterfaceClass, "handle", "([C)V"); assert(meth); jcharArray charArr = (*data->env)->NewCharArray(data->env, arg2); (*data->env)->CallVoidMethod(data->env, data->obj, meth, (jcharArray)charArr); } %} %typemap(jstype) callback_handle_broadcast_t cb "BroadcastCallback"; %typemap(jtype) callback_handle_broadcast_t cb "BroadcastCallback"; %typemap(jni) callback_handle_broadcast_t cb "jobject"; %typemap(javain) callback_handle_broadcast_t cb "$javainput"; %typemap(in,numinputs=1) (callback_handle_broadcast_t cb, void *userdata) { struct callback_data *data = malloc(sizeof *data); data->env = jenv; data->obj = JCALL1(NewGlobalRef, jenv, $input); JCALL1(DeleteLocalRef, jenv, $input); $1 = java_callback; $2 = data; } %include "test.h" 

Java接口BrodcastCallback.java

 public interface BroadcastCallback { //public void handle(String broadcast); public void handle(char[] broadcast); } 

实现界面

 class BtCallback implements BroadcastCallback { @Override public void handle(char[] broadcast) { LOG.debug("Broadcast callback handled: " + broadcast.length); } } 

最后使用时

 BroadcastCallback cb = new BtCallback(); Test.set_handle_broadcast(cb, null); Test.poll_broadcasts(Test.getHandle_broadcast()); 

没有编译错误，但是当程序运行并且poll_broadcasts调用从java传递的句柄广播函数指针（在C中）时，它会与EXCEPTION_ACCESS_VIOLATION崩溃。

看起来它必须对函数的int8 * arg做一些事情，但无法搞清楚

有人请帮忙。