JNA的Void *示例 [英] Void* example for JNA

问题描述

我一直在努力寻找JNA上关于void *示例的示例.我试图了解如何在JNA中使用Pointer.

I have been struggling to find examples on void* example in JNA. I am trying to understand how to use Pointer in JNA.

例如

IN C:

int PTOsetApiOpt(int iOpt,void* lpValue,int iLen)

Parameters: iOpt: int
lpData: address from which data should be read.
iLen: length of data
returns int values : 0 as success or -1 as failure.

我们如何使用JNA在JAVA中编写代码? 我已经在JAVA中尝试过

How do we write that in JAVA using JNA? I have tried this in JAVA

public MyTest{

 public interface MyLibrary extends Library {
   public int PTOsetApiOpt(int iOpt,Pointer lpValue,int iLen);

 }
 public static void main(String[] args) {
   MyLibrary myLib = (MyLibrary)MyLibrary.INSTANCE;
   int result = myLib.PTOsetApiOpt(1,new Pointer(0),1024);
 }

调用myLib.PTOsetApiOpt时，JVM崩溃.我猜这是因为新的Pointer语句.如何创建一个Pointer并将其用作参数，而不会导致JVM崩溃?我已经坚持了两天.任何提示将是巨大的.预先感谢.

I get JVM crash when myLib.PTOsetApiOpt is invoked. I am guessing this is because of new Pointer statement. How can I create a Pointer and use it as parameter without JVM crash? I have been stuck on it for 2 days. Any tips would be great. Thanks in advance.

关于， -Vid-

推荐答案

声明您的方法以IntByReference作为参数，则在调用该方法时不必调用ByReference.getPoint().

Declare your method to take IntByReference as an argument, then you don't have to call ByReference.getPoint() when calling the method.

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