67 lines
1.3 KiB
Go
67 lines
1.3 KiB
Go
package main
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import (
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"bufio"
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"math"
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"os"
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"strconv"
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"strings"
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)
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// round 将浮点数四舍五入到指定小数位
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func round(v float64, places int) float64 {
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factor := math.Pow(10, float64(places))
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return math.Round(v*factor) / factor
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}
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// readFirstLine 读取文件的第一行
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func readFirstLine(path string) string {
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f, err := os.Open(path)
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if err != nil {
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return ""
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}
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defer f.Close()
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scanner := bufio.NewScanner(f)
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if scanner.Scan() {
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return scanner.Text()
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}
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return ""
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}
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// firstMatchInFile 在文件中查找第一个匹配指定前缀的行，并返回冒号后的内容
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func firstMatchInFile(path, prefix string) string {
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f, err := os.Open(path)
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if err != nil {
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return ""
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}
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defer f.Close()
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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line := scanner.Text()
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if strings.HasPrefix(strings.TrimSpace(line), prefix) {
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parts := strings.SplitN(line, ":", 2)
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if len(parts) == 2 {
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return strings.TrimSpace(parts[1])
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}
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}
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}
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return ""
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}
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// readTempFromFile 从文件读取温度值
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func readTempFromFile(path string) float64 {
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content := readFirstLine(path)
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if content == "" {
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return 0
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}
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val, err := strconv.ParseFloat(strings.TrimSpace(content), 64)
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if err != nil {
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return 0
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}
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// 温度通常以毫度为单位
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if val > 1000 {
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return round(val/1000, 1)
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}
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return round(val, 1)
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}
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