英文:
Reading strings, integers and doubles from file with GoLang
问题
在Google Go中，你可以使用bufio.Scanner来从文件中读取数据。对于你的数据文件，你可以按照以下步骤进行读取和分割变量：
-
打开文件：
file, err := os.Open("filename.txt") if err != nil { log.Fatal(err) } defer file.Close() -
创建一个
bufio.Scanner对象来读取文件：scanner := bufio.NewScanner(file) -
使用
scanner.Scan()循环读取文件的每一行：for scanner.Scan() { line := scanner.Text() // 在这里对每一行进行处理 } -
在每一行中，使用
strings.Fields()函数将字符串分割成多个字段：fields := strings.Fields(line) // fields[0] 是字符串 // fields[1] 是浮点数 // fields[2] 是整数
这样，你就可以将每一行的数据分割成不同的变量了。请根据你的需求进行进一步的处理和使用这些变量。
英文:
How to read data from file in Google Go when my data file looks like this:
SomeString 200.0 2
OtherString 100.6 9
OneMoreString 550.8 1
(String, double and integer). I tried bufio.readLine and bufio.readString but these are reading whole line, while i need seperated variables.
答案1
得分: 4
以下是翻译好的内容：
这样的代码可能有效，如果你的字符串中有空格，你可能需要以不同的方式处理：
package main
import (
"fmt"
"os"
)
func main() {
f, err := os.Open("scan.txt")
if err != nil {
fmt.Println(err)
}
for {
var i int
var flt float64
var str string
var n int
n, err = fmt.Fscanln(f, &str, &flt, &i)
if n == 0 || err != nil {
break
}
fmt.Println("string:", str, "; float:", flt, "; int:", i)
}
}
输出结果：
string: SomeString ; float: 200 ; int: 2
string: OtherString ; float: 100.6 ; int: 9
string: OneMoreString ; float: 550.8 ; int: 1
<details>
<summary>英文:</summary>
Something like this might work--if you've got spaces in your string, you might need to handle that differently:
package main
import (
"fmt"
"os"
)
func main() {
f, err := os.Open("scan.txt")
if err != nil {
fmt.Println(err)
}
for {
var i int
var flt float64
var str string
var n int
n, err = fmt.Fscanln(f, &str, &flt, &i)
if n == 0 || err != nil {
break
}
fmt.Println("string:", str, "; float:", flt, "; int:", i)
}
}
outputs:
string: SomeString ; float: 200 ; int: 2
string: OtherString ; float: 100.6 ; int: 9
string: OneMoreString ; float: 550.8 ; int: 1
</details>
# 答案2
**得分**: 0
例如，
package main
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
)
type Data struct {
AString string
AFloat float64
AnInt int64
}
func ParseLine(line string) (*Data, error) {
data := new(Data)
var err error
text := strings.TrimRight(line, " ")
i := strings.LastIndex(text, " ")
i++
text = text[i:]
data.AnInt, err = strconv.ParseInt(text, 10, 64)
if err != nil {
return nil, err
}
line = line[:i]
text = strings.TrimRight(line, " ")
i = strings.LastIndex(text, " ")
i++
text = text[i:]
data.AFloat, err = strconv.ParseFloat(text, 64)
if err != nil {
return nil, err
}
line = line[:i]
data.AString = line
return data, nil
}
func main() {
f, err := os.Open("data.txt")
if err != nil {
fmt.Fprintln(os.Stderr, "opening input:", err)
return
}
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := scanner.Text()
data, err := ParseLine(line)
if err != nil {
fmt.Fprintln(os.Stderr, "reading input:", err, ":", line)
continue
}
fmt.Println(*data)
}
if err := scanner.Err(); err != nil {
fmt.Fprintln(os.Stderr, "reading input:", err)
}
}
输入（data.txt）：
Some String 200.0 2
Other String 100.6 9
One More String 550.8 1
输出：
{Some String 200 2}
{Other String 100.6 9}
{One More String 550.8 1}
<details>
<summary>英文:</summary>
For example,
package main
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
)
type Data struct {
AString string
AFloat float64
AnInt int64
}
func ParseLine(line string) (*Data, error) {
data := new(Data)
var err error
text := strings.TrimRight(line, " ")
i := strings.LastIndex(text, " ")
i++
text = text[i:]
data.AnInt, err = strconv.ParseInt(text, 10, 64)
if err != nil {
return nil, err
}
line = line[:i]
text = strings.TrimRight(line, " ")
i = strings.LastIndex(text, " ")
i++
text = text[i:]
data.AFloat, err = strconv.ParseFloat(text, 64)
if err != nil {
return nil, err
}
line = line[:i]
data.AString = line
return data, nil
}
func main() {
f, err := os.Open("data.txt")
if err != nil {
fmt.Fprintln(os.Stderr, "opening input:", err)
return
}
scanner := bufio.NewScanner(f)
for scanner.Scan() {
line := scanner.Text()
data, err := ParseLine(line)
if err != nil {
fmt.Fprintln(os.Stderr, "reading input:", err, ":", line)
continue
}
fmt.Println(*data)
}
if err := scanner.Err(); err != nil {
fmt.Fprintln(os.Stderr, "reading input:", err)
}
}
Input (data.txt):
Some String 200.0 2
Other String 100.6 9
One More String 550.8 1
Output:
{Some String 200 2}
{Other String 100.6 9}
{One More String 550.8 1}
</details>
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