buffer

问题 I was asked a question that why a byte array is not enough and NIO specially introduces a class Buffer ? What will be a good answer to this question? Is it only a kind of wrapper class which simplifies the read/write operation ? If possible, please give us an example to demonstrate how we benefit from Buffer class which can not/hardly be done with an array. 来源： https://stackoverflow.com/questions/27729953/why-java-nio-introduces-buffer-class-specially-rather-than-using-array

问题 I was asked a question that why a byte array is not enough and NIO specially introduces a class Buffer ? What will be a good answer to this question? Is it only a kind of wrapper class which simplifies the read/write operation ? If possible, please give us an example to demonstrate how we benefit from Buffer class which can not/hardly be done with an array. 来源： https://stackoverflow.com/questions/27729953/why-java-nio-introduces-buffer-class-specially-rather-than-using-array

问题 Does anyone know the default buffer size for basic_filebuf in libstdc++ from the GNU GCC? I know the member function pubsetbuf() and I am pretty sure the the buffer size is implementation-defined. Within C it is simple, take BUFSIZ from <cstdio> . Maybe the variable are called extern_buf , XSIZE , intern_buf or ISIZE ? 回答1: I found it. C++ takes the BUFSIZ from C (see ). The files fstream and fstream.tcc includes the class basic_filebuf . Note: LIBSTDC++ from GCC from file fstream #include

问题 I'm attempting to make an iOS app communicate with a server that uses Bonjour and uses HTTP commands. So far I have been able to find the local domain and locate the particular service I'm looking for. I am able to resolve the address of the service, but I don't know how to get something useful out of the address. The address from the NSNetService is a NSData object and I have no idea what to do with it. I need to send commands like GET and PUT. What cocoa classes handle things like this? I

问题 I try to convert my request payload to base64 but the result of my code is not a valid base64 image. When I try to use it in the browser, it doesn't display the image. So I try to write simple code to convert image to base64 or using npm modules but the result is the same and I don't get a valid image! const request = require('request'); const url = "http://cdn1.giltcdn.com/images/share/uploads/0000/0001/7250/172502872/420x560.jpg"; request({url, gzip: true}, function (err, res, body) { if(

问题 I've been working on this project for about a year now. It's a basic client\server chat program. After a long time of improvement, I decided to test out the strength of my server. On the client, I fired off 200 chat messages ("FLOOD# 1"... "FLOOD# 200") to the server as fast as possible. The result: Server immediately crashes. After some slight tampering, I was able to get the server to process 135 of the 200 messages before giving up. It no longer crashes, but something different happens.

问题 I am working on an alternate screen feature for my cross-platform terminal manipulating crate. Situation When I want to write something to console I can use the following code to write to the current standard output. This works on both UNIX and Windows systems: write!(::std::fmt::io::stdout(), "Some text"). When I switch to the alternate screen, I don't want to write to the current standard output but to the alternate screen. This works differently depending on which platform you are on. The

问题 I'm trying to read blocks from a file and I have a problem. char* inputBuffer = new char[blockSize] while (inputFile.read(inputBuffer, blockSize)) { int i = inputFile.gcount(); //Do stuff } Suppose our block size is 1024 bytes , and the file is 24,3 KiB . After reading the 23rd block, there will be 0,3 KiB left to read. I also want to read that 0,3 KiB , in fact I use gcount() later so I can know how much of the buffer did read(...) modify (in case if it is less). But when it accesses the

问题 I frequently output text to files. I wonder something: how does BufferedWriter work? Does it write text on file when I call writer.write(text) ? If it doesn't write text,do I need to use flush function to write data? For example: File file = new File("statistics.txt"); if (!file.exists()) { file.createNewFile(); } else { file.delete(); file.createNewFile(); } FileWriter fileWritter = new FileWriter(file.getAbsoluteFile(),true); BufferedWriter bufferWritter = new BufferedWriter(fileWritter);

问题 For default Log on android platform has limited amount of character for console output. Around equal a bit more than 3000. Therefore, if the message is longer than 3000 characters, it is not shown on screen. I have not found a better solution than this: public class Log { private static int mode = android.util.Log.INFO; public static void e(String tag, String msg, Throwable tr) { if ((mode & android.util.Log.ERROR) <= 0) return; android.util.Log.e(tag, msg, tr); } public static void e(String