JNA - 带有void *参数的回调方法

时间：2010-06-29 08:29:41

标签： java jna

我有一个C方法，它使用供应商提供的dll注册回调方法。我被告知DLL在一个单独的线程上进行回调，它创建和控制。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来创建JAVA接口代码，该代码生成了以下段代码，

/// <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获得回调，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);
            }
        });
.....
}

当我运行测试时，它成功地使用dll注册回调。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。内存无法“读取”。我怀疑回调中的指针失败了。你能看到我的代码有什么问题吗？在回调中我是否需要Pointer对象？我无法读取JVM崩溃时生成的以下异常报告。非常感谢您的帮助。

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

1 个答案:

答案 0 :(得分：2)

你需要保持对java回调对象的强引用，否则它将被垃圾收集，并且当本机代码试图调用它时JVM将崩溃。见https://jna.dev.java.net/javadoc/com/sun/jna/Callback.html

e.g。这将在类中的静态var中存储对回调的引用。

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);
        }
};

稍后在主代码中，执行：

    tofLib.PTOregReceivedCB(myCallback);
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