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我有一个使用供应商提供的 dll 注册回调方法的 C 方法。有人告诉我，DLL 在它创建和控制的单独线程上进行回调。接收回调可以接收 3 种可能的不同数据消息。

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

我已经使用 JNAERATOR 创建了生成以下段代码的 JAVA 接口代码，

/// <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);

我已经在简单的 main 方法中运行了代码，以确保我可以从 dll 中获取回调，如下所示。

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);
            }
        });
.....
}

当我运行我的测试时，它成功地向 dll 注册了回调。但是后来当 dll 尝试调用回调方法时，jvm 甚至在它到达 JAVA 中的回调方法之前就崩溃了。异常报告显示““0x0b543a46”处的指令引用了“0x0651acc”处的内存。无法“读取”内存”。我怀疑回调中的指针失败了。你能看出我的代码有什么问题吗？我需要回调中的指针对象吗？我无法阅读下面 JVM 崩溃时生成的异常报告。对你的帮助表示感谢。

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

3

你需要保持对java回调对象的强引用，否则它会被垃圾回收，当本地代码试图调用它时JVM会崩溃。见https://jna.dev.java.net/javadoc/com/sun/jna/Callback.html

例如，这会将回调的引用存储在类中的静态变量中。

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);
        }
};

稍后在您的主代码中，只需执行以下操作：

    tofLib.PTOregReceivedCB(myCallback);
于 2010-11-12T05:24:13.127 回答