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Java io (File class, byte stream and byte stream, byte character conversion Stream)

file: file F2 = new file (ARGs [1]); // If (! F1.exists () {system. Out. println ("the source file does not exist! "); System. exit (1);} inputstream input = NULL; // prepare the input stream object and read the source file outputstream out = NULL; // prepare the output stream object, write the target file try {input = new fileinputstream (F1);} catch (filenotfoundexception e) {e. printstacktrace ();} Try {out = new fileoutputstream (F2);} catch (filenotfoundexception e) {e. printstacktrace ();

Conversion of C # host and network byte order about network byte order and host byte order

to highint y=65536//At this time y is the host byte order: [0][0][1][0] low to highWe convert x and y through the host-to-network byte-order conversion function to get their corresponding network byte-order values,The network section order is that high-byte data is stored a

In Java, the type of int is strongly converted to byte, and after a strong conversion to byte, the data exceeds the expression range of byte.

public class Aa {public static void Main (string[] args) {byte i = 88; byte R = 68; byte F = (byte) (i + R); System.out.println (f);}}Output is-10088+68=156; binary is represented as: 1001 1100, after casting to byte, because Byte

Wide-byte and single-byte conversion cstring and char * Conversion in Unicode Character Set

In Visual C ++. in net2005, the default character set format is Unicode, but in vc6.0 and other projects, the default character set format is multi-byte character set (MBCS: Multi-byte character set ), as a result, various types of character operations and functions that are very simple and practical in vc6.0 may report various errors when running in the vs2005 environment. Here we summarize the errors in V

Class struct and byte [] conversion class, byte Conversion

Class struct and byte [] conversion class, byte Conversion public static class StructConvert { public static object BytesToStruct(byte[] bytes, Type strcutType) { int size = Marshal.SizeOf(strcutType); IntPtr buffer = Marshal.AllocH

JS byte conversion, byte conversion GB, etc.

File size Conversionfunction Bytestosize (bytes) {if (bytes = = = 0) return ' 0 B ';var k = 1024;sizes = [' B ', ' KB ', ' MB ', ' GB ', ' TB ', ' PB ', ' EB ', ' ZB ', ' YB '];i = Math.floor (Math.log (bytes)/Math.log (k));var num = Bytes/math.pow (k, i);Return Num.toprecision (3) + "+ sizes[i";Return (Bytes/math.pow (k, i)) + "+ sizes[i";Toprecision (3) is followed by a decimal place, such as 1.0GB//return (Bytes/math.pow (k, i)). Toprecision (3) + "+ sizes[i";}JS

Java byte order (byte sequence conversion for network data transfer in different languages) __java

machines, and the Java byte order is Big-endian.3. So when you write the communication program with C + +, you must use HTONL and htons to convert the integer and short integer data from the host byte sequence to the network byte sequence before sending the data, After receiving data for integer and short integer data, you must call Ntohl and Ntohs to implement

Principles of byte sequence conversion during network communication and network byte sequence, large-end and small-end Modes

Introduction: Do I need to convert the byte order during network communication?Platforms of the same byte sequence can not perform byte sequence conversion during network communication, but must perform byte sequence conversion fo

Conversion between byte, byte array, Int, and long in Java

Conversion source code between byte and INT in Java: // Mutual conversion between byte and INT public static byte inttobyte (int x) {return (byte) x;} public static int bytetoint (byte

Conversion between byte array byte[] and characters (strings) in Java

Transferred from: http://blog.csdn.net/linlzk/article/details/6566124Java and other languages written programs for TCP/IP socket communication, the communication content is generally converted to a byte array type, Java in the character and array conversion is also very convenient;1. Convert character to byte arrayString str = "Luo long";

byte array byte[] and integer, floating-point data conversion--java code

programming languages that conform to this standard, the 32-bit binary string of a floating-point number is the same, not CPU-independent, language-independent.About integers: The integer value of a single byte is one byte, and an integer that occupies multiple bytes has a different representation, with the so-called small-end method. The big-endian method, in detail, can see the following figure.2. Small-

[Java] Java byte array and int,long,short,byte conversion

] = (byte) ((res >> 8) 0xff);//Sub-low TARGETS[2] = (byte) ((res >>) 0xff);//Secondary high TARGETS[3] = (byte) (res >>> 24);//highest bit, unsigned right shift. return targets; } /** * Converts a byte array of length 2 to 16-bit int * * @param Res * byte

byte array byte[] and integer, floating-point data conversion--java code

floating-point number is the same as long as the standard is complied with, and the CPU-independent, language-independentAbout integers: The integer value of a single byte is a byte, an integer that occupies multiple bytes , and its representation is different, with the so-called small-end method, the big-endian method, which can be seen in the figure below.2. Small-end method, big-endian method and host

The conversion process of host byte order and network byte order

When assigning a value to the IP address structure, the function htonl,htons,inet_addr is often used , and the function corresponding to the sockaddr_in is ntohl,ntohs,inet_ntoa. Looking at the parsing of these functions, it is found that these functions are actually related to the conversion between the host byte order and the network byte order . What is the ne

Conversion between byte array and string (character array), byte array

Conversion between byte array and string (character array), byte array 1. Conversion by default: (1) convert string (char []) to byte [] byte[] byteArr = System.Text.Encoding.Default.GetBytes(char[]);

Int, byte, and byte for java data type conversion

Int, byte, and byte for java data type conversion Take a look at the following operations: Public class TestConvert {public static void main (String [] args) {byte b1 = 67; byte b2 = 89; byte B = (

Python Network programming--conversion between host byte order and network byte order

If you ever need to write a low-level network application, it could be necessary to handle the low-level data transmission O Ver The wire between the machines. This operation requires some sort of conversion of data from the native host operating system to the network format and VI Ce versa. This was because each of the one hat its own specific representation of data.When writing underlying low-level network applications, it may be necessary to handle

Conversion between Unicode-encoded wide-byte and single-byte __ encoding

Multi-byte conversion to wide-byte LPWStr Show_char (lpbyte pbyte, DWORD len){LPWSTR LPW;int Wlen;Wlen = MultiByteToWideChar (CP_ACP, 0, (LPCSTR) pbyte, Len + 1, NULL, 0);LPW = new Wchar[wlen];MultiByteToWideChar (CP_ACP, 0, (LPCSTR) pbyte, Len + 1, LPW, Wlen);MessageBox (NULL, LPW, NULL, MB_OK);delete []LPW;return LPW;} Wide

byte array and Int,long,short,byte conversion (reprint)

byte array and short array conversion Public Short Bytestoshort (byte[] bytes) { return bytebuffer.wrap (bytes). Order (Byteorder.little_endian). Getshort (); } Public byte [] Shorttobytes ( short value) { return bytebuffer.allocate (2) . Order (Byteorder.little_endian). Putshort (value). A

String-to-byte array and byte-array-to-string conversion (encoding and decoding issues)

/** String (byte[] bytes, string charsetname): Decodes a byte array by the specified character set* byte[] GetBytes (string charsetname): Encodes a string into a byte array using the specified character set** Code: To see the understanding of the changes can not understand* String--

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