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JNA-具有void *參數的回調方法

[英]JNA - callback method with void* arguments

 原文  2010-06-29 08:29:41  2   1    java/ jna

問題描述

我有一個C方法，使用供應商提供的dll注冊回調方法。 有人告訴我DLL在它創建和控制的單獨線程上進行回調。接收回調可以接收3種可能的不同數據消息。 

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

我已經使用JNAERATOR來創建JAVA接口代碼，該代碼已在以下代碼段中生成， 

/// <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);

我已經在簡單的main方法中運行了代碼，以確保我可以從dll中獲得回調，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);
            }
        });
.....
}

當我運行測試時，它會成功向dll注冊回調。 但是稍后，當dll嘗試調用回調方法時，jvm甚至在到達JAVA中的回調方法之前便崩潰了。 異常報告顯示““在“ 0x0b543a46”處的指令引用了在“ 0x0651accacc”處的存儲器。該存儲器無法被'讀取'”。 我懷疑回調中的Pointer失敗。 您能看到我的代碼有什么問題嗎？ 我在回調中是否需要Pointer對象？ 我無法閱讀以下JVM崩潰時生成的異常報告。 對你的幫助表示感謝。 

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

1 個解決方案

解決方案1
 2  

您需要保留對Java回調對象的強烈引用，否則它將被垃圾回收，並且當本機代碼嘗試調用JVM時，JVM將崩潰。 參見https://jna.dev.java.net/javadoc/com/sun/jna/Callback.html

例如，這將對回調的引用存儲在類的靜態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);
        }
};

稍后在您的主代碼中，只需執行以下操作： 

    tofLib.PTOregReceivedCB(myCallback);

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