How to get Java byte array into Matlab

Question

Patrick Berthoud 2021-7-17

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/880448-how-to-get-java-byte-array-into-matlab

编辑： Harsh Mahalwar 2024-2-28

Dear All,

I am using a Java DataInputStream to get data over TCPIP. To get the data e.g by the method readFully(byte[] b, int off, int len), I have to pass a byte[] array to the Java method. So far I am using a java class DataInputReader that outputs a byte array (see below). Is there a way to do that (and how) directly in Matlab without calling an external java class ? In other word, how a pass to a java class a handle to a Matlab array ?

Thanks for your help

Patrick

****

import java.io.*;

class DataInputReader {

private DataInput m_data_input;

public DataInputReader(DataInput data_input) {

m_data_input = data_input;

}

public byte[] readBuffer(int length) {

byte[] buffer = new byte[length];

try {

m_data_input.readFully(buffer, 0, length);

}

catch (StreamCorruptedException e) {

System.out.println("Stream Corrupted Exception Occured");

buffer = new byte[0];

}

catch (EOFException e) {

System.out.println("EOF Reached");

buffer = new byte[0];

}

catch (IOException e) {

System.out.println("IO Exception Occured");

buffer = new byte[0];

}

return buffer;

}

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Answer 1

Harsh Mahalwar 2024-2-28

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/880448-how-to-get-java-byte-array-into-matlab#answer_1417731

编辑：Harsh Mahalwar 2024-2-28

在 MATLAB Online 中打开

Hi Patrick,

As I can understand, you are trying to implement the “DataInputReader” class into MATLAB. Also, you are interested in understanding how to retrieve Java byte arrays in MATLAB.

Please refer to the following MathWorks documentation for more information on handling data in Java:

Handle Data Returned from Java Methods: https://www.mathworks.com/help/matlab/matlab_external/handling-data-returned-from-java-methods.html

You can import Java datatypes into MATLAB and use them along with your MATLAB arrays, here’s an example:

import java.lang.* 
sampleArray = javaArray('java.lang.Byte', 1, 19); 
for i = 1:numel(sampleArray(1, :)) 
   sampleArray(1, i) = Byte(randi(100, 1)); 
end 