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JNA-具有void *参数的回调方法

[英]JNA - callback method with void* arguments

 原文  2010-06-29 08:29:41  5   1    java/ jna

问题描述

我有一个C方法，使用供应商提供的dll注册回调方法。 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来创建JAVA接口代码，该代码已在以下代码段中生成， 

/// <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，它会成功向dll注册回调。 但是稍后，当dll尝试调用回调方法时，jvm甚至在到达JAVA中的回调方法之前便崩溃了。 异常报告显示““在“ 0x0b543a46”处的指令引用了在“ 0x0651accacc”处的存储器。该存储器无法被'读取'”。 我怀疑回调中的Pointer失败。 您能看到我的代码有什么问题吗？ 我在回调中是否需要Pointer对象？ 我无法阅读以下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 个解决方案

解决方案1
 2  

您需要保留对Java回调对象的强烈引用，否则它将被垃圾回收，并且当本机代码尝试调用JVM时，JVM将崩溃。 参见https://jna.dev.java.net/javadoc/com/sun/jna/Callback.html

例如，这将对回调的引用存储在类的静态var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);

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