bytearray

问题 Like the title says, I have a byte array representing the contents of an image (can be jpeg or png). I want to draw that on a regular canvas object <canvas id='thecanvas'></canvas> How can I do that? UPDATE I tried this (unsuccesfully): (imgData is a png sent as a byte array "as is" through WebSockify to the client) function draw(imgData) { "use strict"; var canvas = document.getElementById("myCanvas"); var ctx = canvas.getContext("2d"); var rdr = new FileReader(); var imgBlob = new Blob(

问题 I need to build a tcp frame with raw binary data, but all examples and tutorials I've found talking about bytes always involve conversion from a string, and that's not what I need. In short, I need to build just an array of bytes: 0xA2 0x01 0x02 0x03 0x04 Please note that I come from C/C++ world. I've tried this: frame = b"" frame += bytes( int('0xA2',16) ) frame += bytes( int('0x01',16) ) frame += bytes( int('0x02',16) ) frame += bytes( int('0x03',16) ) frame += bytes( int('0x04',16) ) Then,

问题 Ok, I am reading in dat files into a byte array. For some reason, the people who generate these files put about a half meg's worth of useless null bytes at the end of the file. Anybody know a quick way to trim these off the end? First thought was to start at the end of the array and iterate backwards until I found something other than a null, then copy everything up to that point, but I wonder if there isn't a better way. To answer some questions: Are you sure the 0 bytes are definitely in

问题 I am new to java. I receive the UDP data in byte array. Each elements of the byte array have the hexadecimal value. I need to convert each element to integer. How to convert it to integer? 回答1: sample code: public int[] bytearray2intarray(byte[] barray) { int[] iarray = new int[barray.length]; int i = 0; for (byte b : barray) iarray[i++] = b & 0xff; // "and" with 0xff since bytes are signed in java return iarray; } 回答2: Manually: Iterate over the elements of the array and cast them to int or

问题 I have to process a large byte array that is passed to my function. I need to copy the content from this incoming byte array in smaller "chunks" to an outbound byte array. For every "chunk" of data created in the outbound array, I need to call a web service. Upon return, I need to resume looping through the incoming byte array, continuing to pass a whole or partial chunk of data until the complete incoming array is processed (i.e. sent to the web service in chunks). I am very new to C# and I

问题 I have an array of bytes that I receive from an external entity. It is a fixed size. The bytes contain a unicode string, with 0 values to pad out the rest of the buffer: So the bytes might be: H \0 E \0 L \0 L \0 \0 \0 \0 \0 \0 ... etc I'm getting that buffer and converting it to a string like so: byte[] buffer = new byte[buffSize]; m_dataStream.Read(buffer, 0, buffSize); String cmd = System.Text.Encoding.Unicode.GetString(buffer); What I get back is a string that looks like this: "HELLO\0\0

问题 First of all I've tried everything, and can't understand why it won't update my varbinary field properly. out of 1728 bytes only the last byte in the byte array is saved to the field... I generate my byte array as follows: public static byte[] StringToByteArray(String hex) { int NumberChars = hex.Length; byte[] bytes = new byte[NumberChars / 2]; for (int i = 0; i < NumberChars; i += 2) bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16); return bytes; } I have also tried the one below:

问题 Question is How do I convert ByteArray to GUID. Previously I converted my guid to byte array, and after some transaction I need my guid back from byte array. How do I do that. Although irrelevant but conversion from Guid to byte[] is as below public static byte[] getByteArrayFromGuid(String str) { UUID uuid = UUID.fromString(str); ByteBuffer bb = ByteBuffer.wrap(new byte[16]); bb.putLong(uuid.getMostSignificantBits()); bb.putLong(uuid.getLeastSignificantBits()); return bb.array(); } but how

问题 I need very fast conversion from byte array to string. Byte array is Unicode string. 回答1: From byte[] array to string var mystring = Encoding.Unicode.GetString(myarray); From string to byte[] var myarray2 = Encoding.Unicode.GetBytes(mystring); 回答2: Try this System.Text.UnicodeEncoding.Unicode.GetString 回答3: UTF8 (I think you mean " UTF8 " instead of " Unicode "). Because, U'll get just Chinese Symbols. ;) Maybe it helps to change... var mystring = Encoding.Unicode.GetString(myarray); ...to...

问题 I constructed an XmlDocument and now I want to convert it to an array. How can this be done? Thanks, 回答1: Try the following: using System.Text; using System.Xml; XmlDocument dom = GetDocument() byte[] bytes = Encoding.Default.GetBytes(dom.OuterXml); If you want to preserve the text encoding of the document, then change the Default encoding to the desired encoding, or follow Jon Skeet's suggestion. 回答2: Write it to a MemoryStream and then call ToArray on the stream: using System; using System