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JNA - méthode de rappel avec arguments void *

2010-06-29 5 views
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J'ai une méthode C qui enregistre la méthode de rappel avec la DLL fournie par le fournisseur. On m'a dit que la DLL effectue le callback sur un thread séparé qu'il crée et contrôle. Il y a 3 messages de données différents possibles qui peuvent être reçus par callback de réception.JNA - méthode de rappel avec arguments void *

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

J'ai utilisé JNAERATOR pour créer du code Java d'interface qui a généré sous le code de segment,

/// <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", "[email protected]@[email protected]@Z"}) 
    int PTOregReceivedCB(TofapiLibrary.pUsrFunc3 arg3);

J'ai couru le code dans la méthode simple principale pour assurer que je puisse obtenir le rappel de dll qui est indiqué ci-dessous. Lorsque j'exécute mon test, il enregistre avec succès le rappel avec dll. Mais plus tard, lorsque dll tente d'invoquer la méthode de rappel, jvm se bloque avant même qu'il n'atteigne la méthode de rappel dans JAVA. Le rapport d'exception montre que "l'instruction" 0x0b543a46 "a référencé la mémoire à" 0x0651acc "La mémoire n'a pas pu être" lue "". Je soupçonne que Pointer dans le rappel échoue. Pouvez-vous voir quelque chose de mal avec mon code? Y a-t-il quelque chose dont j'ai besoin pour l'objet Pointer dans le rappel? Je ne parviens pas à lire le rapport d'exception ci-dessous qui a été généré lorsque JVM est tombé en panne. Votre aide sera grandement appréciée.

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

2010-06-29 user376143

+0

questions de la JNA avec l'argument vide * – user376143

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2

Vous devez garder une forte référence à l'objet de rappel java, sinon il se ramasse-miettes, et la machine virtuelle Java se bloquer lorsque le code natif tente de l'appeler. Voir https://jna.dev.java.net/javadoc/com/sun/jna/Callback.html

par exemple. Cela stocke une référence au rappel dans une variable statique dans la classe.

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); 
     } 
};

plus tard dans votre code principal, il suffit de faire:

tofLib.PTOregReceivedCB(myCallback);

Source

2010-11-12 05:24:13

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