英文:
String not printing properly using FprintF
问题
我正在尝试编写一个IRC客户端，但是我无法使用Fprintf正确地“打印”一个字符串。以下是出现问题的方法：
func (irc *IrcConnection) sendMessage(message string, args ...interface{}) error {
fmt.Printf("Sending: "+message, args)
_, err := fmt.Fprintf(irc.connection, message+" \r\n", args)
if err != nil {
return err
}
return nil
}
我调用它的一个示例是：
ircConnection.sendMessage("PASS %s", ircConnection.info.password)
输出结果是"PASS
"，意味着密码打印时带有方括号，而不仅仅是密码。起初我以为是...interface{}导致它以那种方式打印，但如果我将其更改为...string，问题仍然存在。
如果我尝试：
var test interface{} = ircConnection.info.password
fmt.Printf("%s", test)
它会打印出来而不带方括号。
我对Go语言还不太熟悉，不知道下一步该尝试什么。
英文:
I was trying my hand at an irc client but I can't get a string to "print" properly using Fprintf. This is the method that is not working:
func (irc *IrcConnection) sendMessage(message string, args ...interface{}) (error){
fmt.Printf("Sending: "+message, args)
_, err := fmt.Fprintf(irc.connection, message+" \r\n", args)
if err != nil{
return err;
}
return nil
}
An example of me calling it is
ircConnection.sendMessage("PASS %s", ircConnection.info.password)
The output ends up being "PASS
", meaning that the password prints with square brackets instead of just the password.I though at first it was the ...interface{} making it print like that but if I change it to ...string it has the same problem.
If I try:
var test interface{} = ircConnection.info.password
fmt.Printf("%s", test)
It prints without the brackets.
I'm pretty new to go and have no idea what to try next.
答案1
得分: 2
好的，以下是翻译好的内容：
好的，我刚刚弄清楚了。
_, err := fmt.Fprintf(irc.connection, message+" \r\n", args)
需要改成
_, err := fmt.Fprintf(irc.connection, message+" \r\n", args...)
我试图打印一个数组/切片。
英文:
Ok, just figured it out
_, err := fmt.Fprintf(irc.connection, message+" \r\n", args)
needs to become
_, err := fmt.Fprintf(irc.connection, message+" \r\n", args...)
I was trying to print an array/slice
答案2
得分: 1
你想要的是 fmt.Fprintf(irc.connection, message+" \r\n", args...) — 注意 args...，而不是 args。当你的函数声明 args ...interface{} 时，这意味着它将获取所有剩余的参数作为一个切片。当你将 args 传递给 Fprintf 时，你告诉它打印该切片。作为一个整体，一个切片。要将切片展开为参数列表，你可以使用 ...。
参见 传递参数给 ... 参数。
英文:
You want fmt.Fprintf(irc.connection, message+" \r\n", args...) — note the args..., not args. When your function declares args ...interface{} that means that it will get all of the remaining arguments as a slice. When you pass args to Fprintf, you're telling it to print that slice. As one thing, a slice. To flatten the slice back out into a list of arguments you use the ....
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