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问题 I recently tried to expand my knowledge of the C language and I came across a program that used emit, to possibly emit a byte. __declspec(naked) void marker_begin() { __asm { _emit 0x51; _emit 0x21; _emit 0x1A; _emit 0x14; _emit 0x2C; _emit 0x5B; } } What could this be used for? Thanks in advance. 回答1: Your C program is executing inline assembly code by using the _asm keyword. _asm is a Microsoft specific keyword used in MSDN . The __asm keyword invokes the inline assembler. It must be

问题 I'm trying to send 0x01 HEX as Byte by socket_write($socket, XXXX , 1); There is part of documentation: "...If yes, server will reply to module 0x01, if not – replay 0x00. Server must send answer – 1 Byte in HEX format" Is there any solution to do this by PHP? 回答1: There are multiple alternatives: When using the pack() function, the string argument to the H* format specifier should not include the 0x prefix. pack("H*", "01") To convert a single hex-number into a byte you can also use chr().

问题 I have a simple JSON String jsonPayload = "{\"empid\": \"6\",\"empname\": \"Saurabh\",\"address\": \"home\"}"; jsonPayload.getBytes(); I created avro schema {"namespace": "sample.namespace", "type": "record", "name": "Employee", "fields": [ {"name": "empid", "type": "string"}, {"name": "empname", "type": "string"}, {"name": "address", "type": "string"} ] } When I try to compare them I get an error Exception : org.apache.avro.AvroRuntimeException: Malformed data. Length is negative: -62 at org

问题 I have two approaches to convert long to byte array. for (int i = 0; i < 7; i++) { data[pos + i] = (byte) (value >> (7- i - 1 << 3)); } and for (int i = 7; i >= 0; --i) { data[p + i] = (byte)(newl & 0xff); newl >>= 8; } which of the two operations is more efficient? 回答1: I suggest you look at how the Java code does it. public final void writeLong(long v) throws IOException { writeBuffer[0] = (byte)(v >>> 56); writeBuffer[1] = (byte)(v >>> 48); writeBuffer[2] = (byte)(v >>> 40); writeBuffer[3]

问题 I'm trying to decode a protobuff encoded message, so I need to convert the first byte (the key) in the protobuff message into bits, so I can find the field number. How do I convert a UInt8 (the byte) into an array of bits? Pseudo Code private func findFieldNum(from byte: UInt8) -> Int { //Byte is 0001 1010 var fieldNumBits = byte[1] ++ byte[2] ++ byte[3] ++ byte[4] //concatentates bits to get 0011 getFieldNum(from: fieldNumBits) //Converts 0011 to field number, 2^1 + 2^0 = 3 } I saw this

问题 I work with cellphones and deal with MEID numbers on a daily basis. So instead of searching online for a MEID (a hex number of length 14) to pseudo ESN (a hex number of length 8) calculator, I figured I can make my own program. The way to obtain a pESN from MEID is fairly simple in theory. For example, given MEID 0xA0000000002329, to make a pESN, SHA-1 needs to be applied to the MEID. SHA-1 on A0000000002329 gives e3be267a2cd5c861f3c7ea4224df829a3551f1ab. Take the last 6 hex numbers of this

问题 I want to convert buffer data to byte array. Here's what I've tried import * as fs from 'fs'; [...] event:(data) => { fs.readFile(data, function(err, data) { var arrByte= new Uint8Array(data) var binaryData= new Blob([arrByte]) console.log(binaryData) } } I'm yet to have this work hence my post. I'd very much like to know what I'm doing that's not right. 回答1: The Buffer docs are very enlightening: Prior to the introduction of TypedArray , the JavaScript language had no mechanism for reading

问题 I want to convert buffer data to byte array. Here's what I've tried import * as fs from 'fs'; [...] event:(data) => { fs.readFile(data, function(err, data) { var arrByte= new Uint8Array(data) var binaryData= new Blob([arrByte]) console.log(binaryData) } } I'm yet to have this work hence my post. I'd very much like to know what I'm doing that's not right. 回答1: The Buffer docs are very enlightening: Prior to the introduction of TypedArray , the JavaScript language had no mechanism for reading

问题 I am looking for performance efficient ways to compare two byte[] for equality. Sizes are above 1 MB, so the overhead for each array element should be minimized. I aim to beat the speeds of SequenceEqual or a hand-coded for-loop over every item, by avoiding the repetitive bound checks for both arrays. In the same way that Array.Copy could lead to fast memcpy , what will lead to a memcmp ? 回答1: If performance really matters then the fastest way to do it is by using the CRT library included

问题 I'm trying to convert a byte[] to a float[] by putting the byte[] in a ByteBuffer, converting this to a FloatBuffer ( .asFloatBuffer ), and then converting this to an array. private static float[] toFloatArray(byte[] bytes) { ByteBuffer buffer = ByteBuffer.wrap(bytes); return buffer.asFloatBuffer().array(); } However running: byte[] bytes = {14,32,26,21}; toFloatArray(bytes); Gives me a java.lang.UnsupportedOperationException at java.nio.FloatBuffer.array(Unknown Source) . I believe the