dousi6701 2017-10-18 11:53
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已采纳

将变量作为exec.Command()的参数传递

I want to read user input and use it as an argument for a command. I got this code:

package main

import (
    "bufio"
    "fmt"
    "log"
    "os"
    "os/exec"
)

func main() {
    reader := bufio.NewReader(os.Stdin)
    fmt.Print("Enter img path: ")
    imgPath, _ := reader.ReadString('
')

    args := []string{imgPath, "stdout", "-l spa+eng"}
    out, err := exec.Command("tesseract", args...).Output()
    if err != nil {
        log.Fatal(err)
    }

    fmt.Println(string(out))
}

But when I execute it it outputs an error saying exit status 1.

If instead of using the variable imgPath as an argument I write some text directly into the array it works like a charm.

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1条回答 默认 最新

  • douxie1894 2017-10-19 05:34
    关注

    The following code returns a line with the delimiter (I work on Windows and its EOL is ' '), something that wasn't shown when I printed it on the console.

    reader := bufio.NewReader(os.Stdin)
    imgPath, _ := reader.ReadString('
    ')
    

    In my case it ended up working after I trimmed ' ' from the input:

    package main
    
    import (
        "bufio"
        "fmt"
        "log"
        "os"
        "os/exec"
    )
    
    func main() {
        reader := bufio.NewReader(os.Stdin)
        fmt.Print("Enter img path: ")
        imgPath, _ := reader.ReadString('
    ')
        imgPath= strings.TrimRight(line, "
    ")
    
        args := []string{imgPath, "stdout", "-l spa+eng"}
        out, err := exec.Command("tesseract", args...).Output()
        if err != nil {
            log.Fatal(err)
        }
    
        fmt.Println(string(out))
    }
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论

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