JNA - 访问冲突，JVM 终止

发布于 2024-07-30 00:38:24 字数 1350 浏览 4 评论 0原文

我正在调用 DLL，并向其传递回调函数对象。功能之一是简单打印。然后，我有一个 100 次迭代的循环，只打印索引和循环后的一些打印。

这是 C 代码

extern "C" int Start(void* callback(CString))
{
   for(int j=0; j<100; j++)
    callback(AConvertToString(j));

   callback("in Start called from Java");
   callback("another line");
}

这是 Java 代码

public interface MyDll extends Library{
  MyDll INSTANCE = (MyDll) Native.loadLibrary("MyDll",MyDll.class);
     public interface MyCallback extends StdCallCallback {
            public boolean callback(String msg);
     }
     public int Start(MyCallback callback);
  }

//in main:
...
  MyDll myDll = (MyDll)MyDll.INSTANCE;
  myDll.Start(new MyDll.MyCallback() {
      public boolean callback(String msg) {
         System.out.println(msg);
          return true;          
      }
});

输出是数字 0..41（是的 41！！！不是 99），然后“在从 Java 调用的 Start 中”，然后是可怕的崩溃：

#
# An unexpected error has been detected by Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x7c809823, pid=468, tid=2636
#
# Java VM: Java HotSpot(TM) Client VM (10.0-b23 mixed mode, sharing windows-x86)
# Problematic frame:
# C  [kernel32.dll+0x9823]

我读了很多（这里是好吧）但我找不到问题。我正在运行Java6的JRE。我的机器有 1.5GB 内存。该 DLL 不被任何其他进程使用（没有并发问题）。

谢谢，阿兹瑞尔

原文

I am calling a DLL with passing a callback functio object to it. One of the functions is simple print. I have then, a loop of 100 iterations, just printing the index and a few prints after the loop.

Here is the C code

extern "C" int Start(void* callback(CString))
{
   for(int j=0; j<100; j++)
    callback(AConvertToString(j));

   callback("in Start called from Java");
   callback("another line");
}

Here is the Java code

public interface MyDll extends Library{
  MyDll INSTANCE = (MyDll) Native.loadLibrary("MyDll",MyDll.class);
     public interface MyCallback extends StdCallCallback {
            public boolean callback(String msg);
     }
     public int Start(MyCallback callback);
  }

//in main:
...
  MyDll myDll = (MyDll)MyDll.INSTANCE;
  myDll.Start(new MyDll.MyCallback() {
      public boolean callback(String msg) {
         System.out.println(msg);
          return true;          
      }
});

The output is numbers 0..41 (YES 41!!! not 99) and then "in Start called from Java" followed by a horrible crash:

#
# An unexpected error has been detected by Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x7c809823, pid=468, tid=2636
#
# Java VM: Java HotSpot(TM) Client VM (10.0-b23 mixed mode, sharing windows-x86)
# Problematic frame:
# C  [kernel32.dll+0x9823]

I've read alot (here as well) yet I cannot find the problem.
I am running JRE of Java6. I have 1.5GB of memory on my machine. The DLL is not used by any other process (no concurrency issues).

Thanks,
Azriel

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养猫人 2024-08-06 00:38:24

在我开发一个使用 win32 dll 的电信应用程序的例子中，情况正好相反。

使用 com.sun.jna.Library 和 com.sun.jna.Callback 从回调调用返回时，虚拟机总是会崩溃。

更改为 com.sun.jna.win32.StdCallLibrary 和 com.sun.jna.win32.StdCallLibrary.StdCallCallback 后问题得到解决。

回复收藏 0 原文

梦旅人picnic 2024-08-06 00:38:24

尝试将 MyCallback 编写为 com.sun.jna.Callback 而不是 com.sun.jna.win32.StdCallLibrary.StdCallCallback ：

public interface MyDll extends Library{
  MyDll INSTANCE = (MyDll) Native.loadLibrary("MyDll",MyDll.class);
     public interface MyCallback extends Callback {
            public boolean callback(String msg);
     }
     public int Start(MyCallback callback);
  }

问候，
伊曼纽尔·吉拉德

Try to write your MyCallback as an com.sun.jna.Callback instead as an com.sun.jna.win32.StdCallLibrary.StdCallCallback :

public interface MyDll extends Library{
  MyDll INSTANCE = (MyDll) Native.loadLibrary("MyDll",MyDll.class);
     public interface MyCallback extends Callback {
            public boolean callback(String msg);
     }
     public int Start(MyCallback callback);
  }

Regards,
Emmanuel Girard

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