从 JAVA 到 MATLAB 发送和接收 JSON 个对象

Question

我正在使用 MATLAB 的 javabuilder 工具在 MATLAB 运行time 环境中执行 MATLAB 本机代码。

代码

public String getCHINdex(String tsDataJSON){
  MWCharArray number1 = null;
  Object[] result = null;
  Calibration calibration = null;

  try
  {
     number1 = new MWCharArray(tsDataJSON)   ; // Array of Input to be sent to MATLAB Runtime
     calibration = new Calibration();
     result = calibration.calibrationAPI(1, number1);                    
  }
  catch (Exception e)
  {
     e.printStackTrace();
  }
  finally
  {
     MWArray.disposeArray(number1);
     MWArray.disposeArray(result);
     calibration.dispose();
  }

  if(result.length >= 1){
      return result[0].toString();
  }

  return null;
}

异常

Exception in thread "main" java.lang.IllegalStateException: Attempt to use an MWArray that has been disposed
    at com.mathworks.toolbox.javabuilder.NativeArray.get(NativeArray.java:122)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.mxArrayToString(Native Method)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.access00(MWMCR.java:31)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.mxArrayToString(MWMCR.java:949)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.mathworks.toolbox.javabuilder.internal.MWMCR.invoke(MWMCR.java:769)
    at com.sun.proxy.$Proxy0.mxArrayToString(Unknown Source)
    at com.mathworks.toolbox.javabuilder.MWBuiltinArray.toString(MWBuiltinArray.java:180)
    at com.mathworks.toolbox.javabuilder.MWCharArray.toString(MWCharArray.java:24)
    at .CHIndexCalculation.getCHINdex(CHIndexCalculation.java:45)
    at .CHIndexCalculation.main(CHIndexCalculation.java:15)

我不确定是什么导致了这个异常？当我运行第二次说代码时会发生这种情况。从错误中我可以看出它必须使用已处理的数组来做一些事情。但我不确定为什么会出现这种情况。我每次都创建一个新对象。

Answer 1

我想通了。我只需要在尝试中移动最后一个 if 块。我试图从已处理的 MWArray 中提取结果。

public String getCHINdex(String tsDataJSON){
          MWCharArray number1 = null;
          Object[] result = null;
          Calibration calibration = null;

          try
          {
             number1 = new MWCharArray(tsDataJSON)   ; // Array of Input to be sent to MATLAB Runtime
             calibration = new Calibration();
             result = calibration.calibrationAPI(1, number1);

             if(result.length >= 1){
                  return result[0].toString();
             }
          }
          catch (Exception e)
          {
             e.printStackTrace();
          }
          finally
          {
             MWArray.disposeArray(number1);
             MWArray.disposeArray(result);
             calibration.dispose();
          }

          return null;

    }

从 JAVA 到 MATLAB 发送和接收 JSON 个对象

Send and Receive JSON Objects to and from JAVA to MATLAB

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