英文:
Golang Error - Undeclared name: xxx compiler
问题
我正在编写一段 Golang 代码，用于执行一个在 bash 脚本中正确编写的 curl 命令。以下是我目前的代码（在 VSCode 中）：
url := "https://<DOMAIN>/blah/blah/blah/" // <-- 在 bash 脚本中使用的有效 URL
cmd := exec.Command("curl", "-s --user <USERNAME> --request GET --url "+url+" --header 'Accept: application/json'")
out, err := cmd.Output()
if err != nil {
fmt.Println("错误", err)
return false
}
fmt.Println(out)
在我使用 out 和 err 的不同行上，出现了“未声明的名称：err（编译）”和“未声明的名称：out（编译）”的错误。我在这个帖子这里看到了这种格式的使用方式，所以我就是从那里得到的。我无法弄清楚在这种情况下正确使用 Stdin 或 Stdout。有人可以帮忙吗？
英文:
I am writing a snippet of Golang to perform a curl command that was correctly written in bash script. Here is what I have so far (in VSCode):
url="https://<DOMAIN>/blah/blah/blah/" //<--valid url, used in bash script and it worked
cmd := exec.Command("curl", "-s --user <USERNAME> --request GET --url "+url+" --header 'Accept: application/json'")
out, err = cmd.Output()
if err != nil {
fmt.Println("erorr", err)
return false
}
fmt.Println(out)
All of that ends up giving me the errors "undeclared name: err (compile)" and "undeclared name: out (compile)" on the different lines where I use out and err. I saw this format used on a post here so that's where I got this from. I can't figure out the right way to use Stdin or Stdout in this situation. Can anybody help?
答案1
得分: 3
你的编译错误是由这一行引起的，这一行试图给两个未声明的变量赋值：
out, err = cmd.Output()
这可能应该是一个短变量声明，即：
out, err := cmd.Output()
然而，一旦修复了这个问题，它仍然不会工作，因为你将所有的命令行参数作为一个单独的参数传递给了curl。应该是：
cmd := exec.Command("curl", "-s", "--user", "<USERNAME>", "--request", "GET", "--url", url, "--header", "Accept: application/json")
虽然从Go程序中调用curl相当不寻常；通常你会使用已经存在于net/http中的HTTP客户端，所以很可能所有这些代码都应该被替换为使用本地客户端。
英文:
Your compiler errors are due to this line, which tries to assign to two variables that (as the error says) are undeclared:
out, err = cmd.Output()
This should probably be a short variable declaration, i.e.:
out, err := cmd.Output()
However, once that's fixed, it still won't work, because you're passing all of your CLI params to curl as a single argument. It should be:
cmd := exec.Command("curl", "-s", "--user", "<USERNAME>", "--request", "GET", "--url", url, "--header", "Accept: application/json")
Though it's fairly unusual to invoke curl from a Go program; typically you'd use the HTTP client that already exists in net/http, so it's likely that all of this code should be replaced with use of the native client.
答案2
得分: 1
在你的代码中，你错过了冒号，应该使用:=而不是=。
url = "https://<DOMAIN>/blah/blah/blah/" // <--有效的URL，在bash脚本中使用并且有效
cmd := exec.Command("curl", "-s --user <USERNAME> --request GET --url "+url+" --header 'Accept: application/json'")
out, err := cmd.Output()
if err != nil {
fmt.Println("错误", err)
return false
}
fmt.Println(out)
英文:
In your code you have missed the colon ,use := instead of =
url="https://<DOMAIN>/blah/blah/blah/" //<--valid url, used in bash script and it worked
cmd := exec.Command("curl", "-s --user <USERNAME> --request GET --url "+url+" --header 'Accept: application/json'")
out, err := cmd.Output()
if err != nil {
fmt.Println("erorr", err)
return false
}
fmt.Println(out)
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