JNA - метод обратного вызова с аргументами void * - PullRequest
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JNA - метод обратного вызова с аргументами void *

0 голосов
/ 29 июня 2010

У меня есть метод C, который регистрирует метод обратного вызова с предоставленным поставщиком dll.Мне сказали, что DLL выполняет обратный вызов в отдельном потоке, который она создает и контролирует. Существует 3 возможных различных сообщения данных, которые могут быть получены обратным вызовом приема. 

// Register user receive callback function
int PTOAPI_MODE PTOregReceivedCB(void (__stdcall *pUsrFunc3)(void* lpData,int iDataLen));

Я использовал JNAERATOR для созданияКод интерфейса JAVA, сгенерированный ниже кода сегмента, 

/// <i>native declaration : Ptsptoext.h:728</i>
    public interface pUsrFunc3 extends Callback {
        void invoke(Pointer lpData, int iDataLen);
    }

    /**
     * Original signature : <code>PTOregReceivedCB(pUsrFunc3)</code><br>
     * <i>native declaration : Ptsptoext.h:728</i>
     */
    @Mangling({"_Z16PTOregReceivedCBPFvPviE", "?PTOregReceivedCB@@YAXPFXPAXH@E@Z"}) 
    int PTOregReceivedCB(TofapiLibrary.pUsrFunc3 arg3);

Я запустил код в простом основном методе, чтобы убедиться, что я могу получить обратный вызов из dll, который показан ниже. 

main(){
...
        success = tofLib.PTOregReceivedCB(new TofapiLibrary.pUsrFunc3() {

            @Override
            synchronized public void  invoke(Pointer lpData, int iDataLen) {
                System.out.println("PTOregRecievedCB has been called with data lenght = " + iDataLen);
            }
        });
.....
}

Когда я запускаю свой тест, он успешно регистрирует обратный вызов с помощью dll.Но позже, когда dll пытается вызвать метод обратного вызова, jvm падает до того, как достигнет метода обратного вызова в JAVA.Отчет об исключении показывает, что «Инструкция по адресу« 0x0b543a46 »ссылается на память по адресу« 0x0651acc ». Память не может быть« прочитана »».Я подозреваю, что указатель в обратном вызове не работает.Не могли бы вы увидеть что-то не так с моим кодом?Есть ли что-то, что мне нужно для объекта Pointer в обратном вызове?Я не могу прочитать отчет об исключениях, который был сгенерирован после сбоя JVM.Ваша помощь будет принята с благодарностью. 

<?xml version="1.0" encoding="UTF-16"?>
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....
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1 Ответ

2 голосов
/ 12 ноября 2010

Вам необходимо сохранять строгую ссылку на объект обратного вызова java, иначе он получит сборщик мусора, и JVM потерпит крах, когда нативный код попытается вызвать его.См. https://jna.dev.java.net/javadoc/com/sun/jna/Callback.html

Например, здесь хранится ссылка на обратный вызов в статической переменной в классе. 

static final TofapiLibrary.pUsrFunc3 myCallback = new TofapiLibrary.pUsrFunc3() {

        @Override
        synchronized public void  invoke(Pointer lpData, int iDataLen) {
            System.out.println("PTOregRecievedCB has been called with data lenght = " + iDataLen);
        }
};

Позже в вашем основном коде просто выполните: 

    tofLib.PTOregReceivedCB(myCallback);
...