defer file.Close() buffer := make([]byte, BufferSize) for { bytesread, err := file.Read(buffer) if err != nil { if err != io.EOF { fmt.Println(err) } break } fmt.Println("bytes read: ", bytesread) fmt.Println("bytestream to string: ", string(buffer[:bytesread])) } } ...
Read reads up to len(b) bytes from the File. It returns the number of bytes read and any error encountered. At end of file, Read returns 0, io.EOF. 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 er...
content, err := ioutil.ReadAll(file)iferr !=nil{ fmt.Println("read to fd fail", err)return""}returnstring(content) }// WriteOne 使用 bufio.NewWriter 写文件funcWriteOne(){ fileName :="file/test3"file, err3 := os.Create(fileName)//创建文件deferfile.Close()iferr3 !=nil{ fmt.Pr...
d1 := []byte("hello\ngo\n") err := ioutil.WriteFile("/tmp/dat1", d1, 0644) check(err) f, err := os.Create("/tmp/dat2") check(err) defer f.Close() d2 := []byte{115, 111, 109, 101, 10} n2, err := f.Write(d2) check(err) fmt.Printf("wrote %d bytes\n", n...
funcFileRead(name string){iffileObj,err:=os.Open(name);err==nil{defer fileObj.Close()//在定义空的byte列表时尽量大一些,否则这种方式读取内容可能造成文件读取不完整buf:=make([]byte,1024)ifn,err:=fileObj.Read(buf);err==nil{fmt.Println("The number of bytes read:"+strconv.Itoa(n),"Buf...
Write(C.GoBytes(unsafe.Pointer(buf), buf_size)) if err != nil { return -1 } return C.int(n) } var ( reader *io.PipeReader writer *io.PipeWriter ) 这样,就建立起golang中数据流到ffmpeg的桥梁了。 现在完善ffmpeg部分 int videoCut(read_func reader, write_func writer) { unsigned ...
=nil{log.Printf("Failed to open file %s,err:%s",*filename,err.Error())os.Exit(1)}deferf.Close()buf:=bufio.NewReader(f)for{line,err:=buf.ReadBytes('\n')log.Print(string(line))iferr!=nil{iferr==io.EOF{log.Println("end of file")break}else{log.Printf("read file err:%s",...
ioutil.ReadAll(file) 使用 io.Reader 读取 *///bytes, err := ioutil.ReadFile(filename) // ioutil.ReadAll(file)//check(err)//fmt.Printf("reader buf data: \n%s \n", bytes)//fmt.Printf("buf data: %d \n", len(bytes))// buffer reader// bufio//bufferReader := bufio.NewReader(...
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 withRead, and print the array buffer to the console withPrint....
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