英文:
Go Routine for cmd exec but with errorcode
问题
我是一个Go语言的初学者。
我想使用这个代码片段：https://stackoverflow.com/questions/18405023/how-would-you-define-a-pool-of-goroutines-to-be-executed-at-once-in-golang
（这个答案）
我需要像这样检查每个执行的命令的错误：
out, err := exec.Command(cmd,params).Output()
但是，在这个代码片段中没有错误检查：
tasks <- exec.Command("zenity", "--info", "--text='Hello from iteration n."+strconv.Itoa(i)+"'")
当命令执行时，如何检查错误？
英文:
I am a beginner in Go.
I would like to use the code snippet from : https://stackoverflow.com/questions/18405023/how-would-you-define-a-pool-of-goroutines-to-be-executed-at-once-in-golang
(this answer)
I need to check the error for each cmd executed as in :
out, err := exec.Command(cmd,params).Output()
But, in the snippet there is no error checking:
tasks <- exec.Command("zenity", "--info", "--text='Hello from iteration n."+strconv.Itoa(i)+"'")
How can check for errors when the cmd executes ?
答案1
得分: 1
那行代码：
tasks <- exec.Command("zenity", "--info", "--text='Hello from iteration n."+strconv.Itoa(i)+"'")
将一个Cmd对象添加到通道中，稍后将从该通道中提取并由以下代码执行：
for cmd := range tasks {
cmd.Run()
}
所以在这里你需要检查错误代码。由于你建议使用Cmd.Output而不是Run，代码将如下所示：
for cmd := range tasks {
out, err := Cmd().Output()
}
你看，exec.Command创建并初始化一个对象，而.Output或.Run告诉该对象执行其任务。
英文:
That line:
tasks <- exec.Command("zenity", "--info", "--text='Hello from iteration n."+strconv.Itoa(i)+"'")
is adding a Cmd object into the channel, from where it will be pulled later and executed by this code:
for cmd := range tasks {
cmd.Run()
}
so it is here that you need to check the error code. Since you suggested you wanted to use Cmd.Output instead of Run, it would look like this:
for cmd := range tasks {
out, err := Cmd().Output()
}
You see, exec.Command creates and initializes an object, and .Output or .Run tells that object to do its stuff.
答案2
得分: 0
exec.Command不会执行命令，它只会创建一个*Cmd对象。
你可以在go func()中检查错误。
go func() {
for cmd := range tasks {
err := cmd.Run()
// 在这里进行测试
}
wg.Done()
}()
英文:
exec.Command doesn't execute the command, it creates a *Cmd only.
You would check the err in the go func()
go func() {
for cmd := range tasks {
err := cmd.Run()
// do the test here
}
wg.Done()
}()
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