Read byte array up to a NUL character

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I am receiving a packet with byte array via UDP in Java. I know the maximum possible byte size, but I don't know currently received size.

If I create a String instance from this byte array, then the string will have lots and lots of NUL characters (\u0000) after the useful payload.

How do I convert this byte array to String up to a point when the first NUL appears? (I do not expect to have NUL in my payload).

Don't create the String from the whole thing. Scan the byte array for the zero, and then call

new String(byteArray, 0, correctLength, "encoding")

Null-terminated string, In computer programming, a null-terminated string is a character string stored as an array containing the characters and terminated with a null character ( '\0'  Note, this doesn't explain why it should be so that “If I remove the allocation for the null-byte in the second code, it does not get a response from my device”, although practically anything can happen if you say cmd[8]=0; after allocating only 8 bytes of storage.

You might be able to use StringTokenizer to get the first part of the string until you see the first NULL. something like: result = (new stringTokenizer(packet, null)).nextToken()

Null character, The null character (also null terminator or null byte) is a control character with the value zero. It is present in many character sets, including ISO  However, in Modified UTF-8 the null character is encoded as two bytes: 0xC0, 0x80. This allows the byte with the value of zero, which is now not used for any character, to be used as a string terminator.

String has a split method that will break it into an array of strings based on where a regex appears. You could do

    s = s.split("\u0000")[0];

to split the string around NUL characters and take the first section.

Null Character, In C an array is setup with an array of characters, such as: If a string is read from the keyboard then the maximum number of characters that can be entered is​  The compiler counts the elements and creates an array of the appropriate size. Finally you can both initialize and size your array, as in mySensVals. Note that when declaring an array of type char, one more element than your initialization is required, to hold the required null character.

I had to solve this recently, here's my solution:

public String getString(byte[] sb) {
    // trim nulls from end
    int strLen = sb.length;
    for (; strLen > 0; strLen--)
        if (sb[strLen - 1] != '\u0000')

    return new String(sb, 0, strLen, "UTF8");

Null-terminated byte strings, Each byte in a byte string encodes one character of some character set. For example, the character array {'\x63','\x61  The[] b) method reads b.length number of bytes from the input stream to the buffer array b. The bytes read is returned as integer. The method returns the number of bytes actually read into the buffer, or -1 if the end of the stream is reached. The following example

Do strings in Java also terminate with a '\0' character like strings in C , In the Java programming language, unlike C, an array of char is not a String, and neither a String nor an array of char is terminated by '\u0000' (the NUL character). s3 = s;; // convert to character array; // put NUL in 6th char; // replace; char[] ca = s3. C uses pointers to char (char *) for strings, with char being 1 byte each. Was searching around for you.. It seems a C++ string can handle null bytes. It's the old school C strings (char array) that uses a null byte to end the string. The write function is C not C++. IIRC in C++ it should be cout << . Experience is something you don't get until just after you need it.

Null byte app, 1 Scan the Java string (convert it to a char array first) for null bytes. Sign in Sign up Instantly share code, notes Except does not care about order of items or  No - there is no “special” integer that does that…although if you know something about your data, you could choose to make one. Maybe your array is a bunch of percentages - or the distances between cities - in which case, you could use a negative

Incorrect encoding of null character in buffer · Issue #394 · nodejs , In node v0.3.0 buffers are not encoding null character '\0' correctly ~$ nvm use byteLength('\u0000') actually does return 1 but new Buffer('\u0000') cuts off a  The btowc function (“byte to wide character”) converts a valid single byte character c in the initial shift state into the wide character equivalent using the conversion rules from the currently selected locale of the LC_CTYPE category. If (unsigned char) c is no valid single byte multibyte character or if c is EOF, the function returns WEOF.