You probably want something like this. Either checking the length fails, or the BinaryReader is doing seeks behind the scenes. HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(url); WebResponse myResp = myReq.GetResponse(); byte[] b = null; using( Stream stream = myResp.GetResponseStream() ) using( MemoryStream ms = new MemoryStream() ) { int count = 0; do { byte[] buf = … Read more
I would suggest using the members of string, but with an explicit encoding: byte[] bytes = text.getBytes(“UTF-8”); String text = new String(bytes, “UTF-8”); By using an explicit encoding (and one which supports all of Unicode) you avoid the problems of just calling text.getBytes() etc: You’re explicitly using a specific encoding, so you know which encoding … Read more
You don’t need a whole function for this; a simple cast will suffice: int x; static_cast<char*>(static_cast<void*>(&x)); Any object in C++ can be reinterpreted as an array of bytes. If you want to actually make a copy of the bytes into a separate array, you can use std::copy: int x; char bytes[sizeof x]; std::copy(static_cast<const char*>(static_cast<const void*>(&x)), … Read more
Use the bitwise OR (|) and AND (&) operators. To set a bit, namely turn the bit at pos to 1: my_byte = my_byte | (1 << pos); // longer version, or my_byte |= 1 << pos; // shorthand To un-set a bit, or turn it to 0: my_byte = my_byte & ~(1 << pos); … Read more
Parse it to an integer in base 2, then convert to a byte array. In fact, since you’ve got 16 bits it’s time to break out the rarely used short. short a = Short.parseShort(b, 2); ByteBuffer bytes = ByteBuffer.allocate(2).putShort(a); byte[] array = bytes.array();
You’ve said in the comments that you want four bytes from the input array to correspond to one integer on the output array, so that works out nicely. Depends on whether you expect the bytes to be in big-endian or little-endian order, but… IntBuffer intBuf = ByteBuffer.wrap(byteArray) .order(ByteOrder.BIG_ENDIAN) .asIntBuffer(); int[] array = new int[intBuf.remaining()]; intBuf.get(array); … Read more
In general: value = (value & ~mask) | (newvalue & mask); mask is a value with all bits to be changed (and only them) set to 1 – it would be 0xf in your case. newvalue is a value that contains the new state of those bits – all other bits are essentially ignored. This … Read more
You just needed to cast the unsigned char into a char as the string class doesn’t have a constructor that accepts unsigned char: unsigned char* uc; std::string s( reinterpret_cast< char const* >(uc) ) ; However, you will need to use the length argument in the constructor if your byte array contains nulls, as if you … Read more
Works in Python 2.7 and higher including python3: result = bytearray.fromhex(‘deadbeef’) Note: There seems to be a bug with the bytearray.fromhex() function in Python 2.6. The python.org documentation states that the function accepts a string as an argument, but when applied, the following error is thrown: >>> bytearray.fromhex(‘B9 01EF’) Traceback (most recent call last): File … Read more
int x = (number >> (8*n)) & 0xff; where n is 0 for the first byte, 1 for the second byte, etc.