JNA-具有void *参数的回调方法 [英] JNA - callback method with void* arguments

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本文介绍了JNA-具有void *参数的回调方法的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

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

I have a C method that registers call back method with vendor provided dll. 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.

// 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，该代码已在以下分段代码中生成，

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

/// <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，以确保可以从dll中获得回调，如下所示.

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

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

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"处的内存.该内存无法被'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?回调中的Pointer对象是否需要一些东西?我无法阅读下面的异常报告，该报告是JVM崩溃时生成的.您的帮助将不胜感激.

When I run my test, it successfully registers the callback with dll. But later when dll tries to invoke the callback method, jvm crashes even before it reaches the callback method in JAVA. Exception report shows that " The instruction at "0x0b543a46" referenced memory at "0x0651acc". The memory could not be 'read'" . I am suspecting that Pointer in the callback is failing. Could you see anything wrong with my code? Is there something I need for Pointer object in the callback? I am unable to read the Exception report below that was generated when JVM crashed. Your help will be greatly appreciated.

<?xml version="1.0" encoding="UTF-16"?>
<DATABASE>
<EXE NAME="javaw.exe" FILTER="GRABMI_FILTER_PRIVACY">
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....
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推荐答案

您需要保留对Java回调对象的强引用，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.请参见 https://jna.dev.java.net/javadoc/com/sun/jna/Callback.html

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. See https://jna.dev.java.net/javadoc/com/sun/jna/Callback.html

例如这样会将对回调的引用存储在类的静态var中.

e.g. This stores a reference to the callback in a static var in the class.

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);
        }
};

稍后在您的主要代码中，只需执行以下操作即可:

Later in your main code, just do:

    tofLib.PTOregReceivedCB(myCallback);

这篇关于JNA-具有void *参数的回调方法的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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