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POHandling C char arrays with Java char arrays
 

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  1. POHandling C char arrays with Java char arrays
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    <p>Through a socket I am sending information from a program written in C to a program written in Java.</p> <p>Through the program in C, I am sending two bytes through a char array (using an internet socket), and the received information in Java is stored in a char array also.</p> <p>My main problem is that the received information in the Java array does not correspond properly to the transmitted information from the C program.</p> <p>I have read that the chars in Java are 16 bits long, and the chars in C are 8 bits long. That may be the problem, but I do not know how to handle/solve that.</p> <p>The C code to send information is the following:</p> <pre><code>char buffer[256]; bzero(buffer,256); n = read(fd, buffer, 255); // getting info from an uart port, which works properly n = write(sockfd,buffer,3); // send the information through the socket </code></pre> <p>Part of the Java code (for an Android app) is the following:</p> <pre><code>char[] buffer = new char[256]; BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream())); int readX = in.read(buffer, 0, 3); if (readX &gt; 0) { // I am using a handler to manipulate the info Message msg = new Message(); msg.obj = buffer; mHandler.sendMessage(msg); } .... // Part of the handler is the following: mHandler = new Handler() { @Override public void handleMessage(Message msg) { char[] buffer; buffer = (char[])msg.obj; // the information here is different from the one sent from the C program .... } } </code></pre> <p>Any suggestion to solve this problem I would really appreciate it. </p> <p>Thanks in advance, Gus. </p>
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    1. COIf you can isolate a "minimal case" that fails in the same way, presenting the C source and the Java source, it would (possibly) help.
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    2. COThere could be lots of ways in which your code gets this wrong. I concur with Vatine that seeing the code would help us help you.
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