how to count bytes

Chapter 1: Introduction and Basic Concepts 1. Linux follows the philosophy that everything is a file. A file is referenced by a unique file descriptor (FD). The file descriptor is an integer (INT type of C ). FD is shared by user space programs, and

The stream. Read method in the Microsoft. NET Framework base class Library: Stream. Read Method When being rewritten in a derived class, the system reads the byte sequence from the current stream and increases the position in the stream to the

Transfer of data between channelsIn Java NiO, if one of the two channels is FileChannel, you can transfer the data directly from one channel (translator note: Channel Chinese translation channels) to another channel.Transferfrom ()The Transferfrom ()

Recently in Reading Apue, the side to see also have to do to have effect. Just Linux under a lot of commands are open source, you can directly see the source code. The GNU coreutils is a good choice. SOURCE package has our most commonly used LS, cat

5. Transmission of data between different channel channel In Java NiO, if one of the two channels is filechannel, then we can transfer the data directly from one channel to another channel. There are two different ways to transfer data between two

Original: Share a very useful Java program (key Code) (eight)---Java InputStream read the network response response data Method! ImportantJava InputStream Read Data

Original Delphi Cave Cave main Xalion on his blog posted an article:"Using HTTP. Sys to let Delphi's multi-layered service fly up"Http://www.cnblogs.com/xalion/p/6219515.htmlHere the side mentioned how to Mormot httpserver out, grafting to webbroker,

Operating System Reading Report-Introduction to Real-Time Linux Feifei (98132194) Abstract: This article makes a simple analysis on a real-time Linux instance nmt rt-Linux, and points out the role of Linux in general real-time operating

I think these functions fill () fill_n () strcpy. 1. memcpy () Prototype: extern void * memcpy (void * DEST, void * SRC, unsigned int count ); Usage: # include Function: copy count bytes from the memory area indicated by Src to the memory area

In a sense, I/O systems can be divided into two categories: one is the console, but a file system, including displays and hard disks. In C #, I/O operations are performed through data streams. What is data stream? A data stream is an abstraction of

1. IntroductionSun's Network File System (NFS) protocol provides transparent remote access to shared files in the network. The NFS protocol is designed to be suitable for different machines, operating systems, network systems, and transmission

# Include Void * memset (void * DEST, int C, size_t count );Set count characters before DEST to C.Returns the value of DeST.Void * memmove (void * DEST, const void * SRC, size_t count );Copy count byte characters from SRC to dest. If SRC and DEST

1. Read Function 1) function prototype: # Include Ssize_t read (int fd, void * Buf, size_t count ); 2) function: The read system calls to read count bytes from the file indicated by the file descriptor FD to the Buf. 3) parameter description: FD:

    # Include "memory. H" Memset is used to set all memory spaces to a specific character. It is generally used to initialize the defined string to ''or '/0'. For example, char a [100]. memset (A, '/0', sizeof ()); Memcpy is used for memory copying.

Author: Cao Dongyang,Hua Qing vision embedded college lecturer. Open () functionFunction: open a device file.Prototype: # include# Include# IncludeInt open (const char * pathname, int flag ); Note: use the property specified by flags to open the

Explanation of C-language string functions Void * memset (void * DEST, int C, size_t count );Set count characters before DEST to C. Returns the value of DeST. Void * memmove (void * DEST, const void * SRC, size_t count ); Copy count byte characters

Linux C programming practice (5 )?? Driver Design 1. introduction the device driver is the interface between the operating system kernel and the Machine hardware. it shields the hardware details for applications. Generally, the Linux device driver

File Input and Output Functions Keyboard, display, printer, disk drive, and other logical devices. Component Management Method. In programming, the most commonly used disk files are used. Therefore, this section mainly uses Disk Files are the main

Socket programming practices in Linux (4) TCP packet sticking problems and common solutions Generation of TCP packet sticking problems Because the TCP protocol is a byte stream-based and borderless transmission protocol, it is very likely to cause a

[C language library function source code] [This program is compiled in Dev C ++ 4.9.9.2] /* Sets the first "count" bytes of the memory starting at "DST" To the character value "Val ". Set the first count bytes of the memory area referred to by DST