os.Stdin, os.Stdout, os.Stderr: console终端标准输出,err os.File: 网络,标准输入输出,文件的流读取 strings.Reader: 把字符串抽象成Reader bytes.Reader: 把[]byte抽象成Reader bytes.Buffer: 把[]byte抽象成Reader和Writer bufio.Reader/Writer: 抽象成带缓冲的流读取(比如按行读写) io库 io 库属于底层...
// Read reads up to len(b) bytes from the File and stores them in b. // It returns the number of bytes read and any error encountered. // At end of file, Read returns 0, io.EOF. func(f *File)Read(b []byte) (nint, errerror) { iferr := f.checkValid("read"); err !=n...
fmt.Println("The number of bytes read:"+strconv.Itoa(n))//这里的buf是一个[]byte,因此如果需要只输出内容,仍然需要将文件内容的换行符替换掉fmt.Println("Use bufio.NewReader and os.Open read file contents to a []byte:",string(buf)) } } } 读取文件全部示例 /** * @File Name: readfile....
We define an array of 16 bytes. for { n, err := reader.Read(buf) if err != nil { if err != io.EOF { log.Fatal(err) } break } fmt.Print(string(buf[0:n])) } In the for loop, we read data into the buffer with Read, and print the array buffer to the console with ...
Golang 作为一门“现代化”的语言,原生就包含了强大的性能分析工具 pprof 和 trace。pprof 工具常用于分析资源的使用情况,可以采集程序运行时的多种不同类型的数据(例如 CPU 占用、内存消耗和协程数量等),并对数据进行分析聚合生成的报告。trace 工具则关注程序运行时
Notice treating EOF.Readtries to fillbufon each call, and returnsio.EOFas error if it reaches end of file in doing so. In this casebufwill still hold data. Consequent calls toReadreturns zero as the number of bytes read and sameio.EOFas error. Any other error will lead to a panic. ...
Write writes len(b) bytes to the File. It returns the number of bytes written and an error, if any. Write returns a non-nil error when n != len(b). Seek sets the offset for the next Read or Write on file to offset, interpreted according to whence: 0 means relative to the origi...
onQuitfunc(err error)connections sync.Map// key=fd, value=connection}// Run this server.func(s*server)Run()(err error){s.operator=FDOperator{FD:s.ln.Fd(),OnRead:s.OnRead,OnHup:s.OnHup,}// 从pollmanager中选择出来一个epoll,来管理server fd,也就是设置mainReactors.operator.poll=pollman...
buf := bytes.NewBufferString("hello world") buf.WriteTo(file)//或者使用写入,fmt.Fprintf(file,buf.String())} 四、读出缓冲器 1、Read方法,给Read方法一个容器,读完后p就满了,缓冲器相应的减少。 // func (b *Buffer) Read(p []byte)(n int,err error)funcmain(){ ...
Go语言学习之ioutil包(The way to go) 其中提到了两个方法: func ReadFile funcReadFile(filenamestring)([]byte,error) ReadFile reads the file named by filename and returns the contents. A successful call returns err == nil, not err == EOF. Because ReadFile reads the whole file, it does...