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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  2   1    java/ jna

问题描述

I have a C method that registers call back method with vendor provided dll. 我有一个C方法，使用供应商提供的dll注册回调方法。 I have been told that the DLL makes the callback on a separate thread which it creates and controls.There are 3 possible different data messages that can be received by receive callback. 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));

I have used JNAERATOR to create JAVA interface code which has generated below segment code, 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);

I have ran the code in the simple main method to ensure i could get callback from dll which is shown below. 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);
            }
        });
.....
}

When I run my test, it successfully registers the callback with dll. 当我运行测试时，它会成功向dll注册回调。 But later when dll tries to invoke the callback method, jvm crashes even before it reaches the callback method in JAVA. 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。 Exception report shows that " The instruction at "0x0b543a46" referenced memory at "0x0651acc". The memory could not be 'read'" . 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'”。 I am suspecting that Pointer in the callback is failing. 我怀疑回调中的Pointer失败。 Could you see anything wrong with my code? 您能看到我的代码有什么问题吗？ Is there something I need for Pointer object in the callback? 我在回调中是否需要Pointer对象？ I am unable to read the Exception report below that was generated when JVM crashed. 我无法阅读以下JVM崩溃时生成的异常报告。 Your help will be greatly appreciated. 对你的帮助表示感谢。 

<?xml version="1.0" encoding="UTF-16"?>
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....
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1 个解决方案

解决方案1
 2  

You need to keep a strong reference to the java callback object, otherwise it will get garbage collected, and the JVM will crash when the native code tries to call it. 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。 See https://jna.dev.java.net/javadoc/com/sun/jna/Callback.html 参见https://jna.dev.java.net/javadoc/com/sun/jna/Callback.html

eg This stores a reference to the callback in a static var in the class. 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);
        }
};

Later in your main code, just do: 稍后在您的主代码中，只需执行以下操作： 

    tofLib.PTOregReceivedCB(myCallback);

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