data, err := os.ReadFile("./file.txt") if err != nil { fmt.Println("File reading error", err) return } fmt.Println("Contents of file:") fmt.Println(string(data)) } 2. 读取特定字节数据到内存中 当文件过大时,读取整个文件到内存中会把内存打爆,鉴于这种情况,我们可以把整个文件分成特定...
data, err := ioutil.ReadFile(*fptr)iferr !=nil { fmt.Println("File reading error", err)return} fmt.Println("Contents of file:", string(data)) } 在上述程序里,命令行传入文件路径,程序读取了该文件的内容。使用下面命令运行该程序。 wrkspacepath/bin/filehandling -fpath=/path-of-file/test...
data, err := ioutil.ReadFile("test.txt") if err != nil { fmt.Println("File reading error", err) return } fmt.Println("Contents of file:", string(data)) } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 由于无法在 playground 上读取文件,因此请在你的本地环境...
=nil{log.Printf("Failed to read file %s,err:%s",*filename,err.Error())os.Exit(1)}fmt.Println(string(contents))} 一次只读取一行 funcmain(){filename:=flag.String("f","","Specify the file name")flag.Parse()iffilename==nil||len(*filename)==0{flag.Usage()os.Exit(1)}f,err:=o...
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 not treat an EOF from Read as an error to be reported....
var b []byteb = append(b, "bar"...) // append string contents b == []byte{'b', 'a', 'r' } 函数copy将切片元素从源src复制到目标dst,并返回复制的元素数。两个参数必须具有相同的元素类型T,并且必须可赋值给类型为[]T的切片。复制的元素是len(src)和len(dst)的最小值。作为一种特殊情况...
filename and returns the contents.// A successful call returns err == nil, not err == EOF. Because ReadFile// reads the whole file, it does not treat an EOF from Read as an error// to be reported.func ReadFile(filename string) ([]byte, error) {f, err := os.Open(filename)...
ALSO READ Golang GOPATH vs GOROOT Comparison func ReadFile(name string) ([]byte, error): ReadFile reads the named file and returns the contents. A successful call returns err == nil, not err == EOF. Because ReadFile reads the whole file, it does not treat an EOF from Read as an...
file, err := os.Open("file.txt") if err != nil { fmt.Println("无法打开文件:", err) return } defer file.Close() 创建一个Scanner对象来读取文件内容: 代码语言:txt 复制 scanner := bufio.NewScanner(file) 逐行读取文件内容并处理: 代码语言:txt 复制 for scanner.Scan() { line := scanne...
func ReadDir(name string) ([]DirEntry, error) // ReadFile reads the named file and returns the contents. // A successful call returns err == nil, not err == EOF. // Because ReadFile reads the whole file, it does not treat an EOF from Read // as an error to be reported. func...