blocks|key|4617294|text|使用顶级常量C_ARGC和C_ARGV。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4617295|for+i+in+1..C_ARGC+{
++++let+index+=+Int(i);

++++let+arg+=+String.fromCString(C_ARGV[index])
++++switch+arg+{
++++case+"this":
++++++++println("this+yo");

++++case+"that":
++++++++println("that+yo")

++++default:
++++++++println("dunno+bro")
++++}
}|code-block|syntax|javascript|4617296|注意，我使用的范围是1..C_ARGC，因为C_ARGV“数组”的第一个元素是应用程序的路径。|4617297|C_ARGV变量实际上不是一个数组，但可以像数组一样使用子脚本化。|4617298|entityMap^0|6|6|D|6|0|0|A|9|M|6|0|0|6|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|V|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|11|8|@$9|12|A|13|B|C]]|D|@]|E|$]]|$1|O|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|P|$]]

Use the top level constants <code>C_ARGC</code> and <code>C_ARGV</code>.

<pre><code>for i in 1..C_ARGC {
 let index = Int(i);

 let arg = String.fromCString(C_ARGV[index])
 switch arg {
 case "this":
 println("this yo");

 case "that":
 println("that yo")

 default:
 println("dunno bro")
 }
}
</code></pre>

Note that I'm using the range of <code>1..C_ARGC</code> because the first element of the <code>C_ARGV</code> "array" is the application's path.

The <code>C_ARGV</code> variable is not actually an array but is sub-scriptable like an array.

blocks|key|111185|text|任何想要使用旧的"getopt“(在Swift中可用)的人都可以将其作为参考。我用C编写了GNU示例的Swift移植，可以在以下位置找到：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|111186|http://www.gnu.org/software/libc/manual/html_node/Example-of-Getopt.html|offset|length|111187|以及完整的描述。它已经过测试，功能齐全。它也不需要Foundation。|111188|var+aFlag+++=+0
var+bFlag+++=+0
var+cValue++=+String()

let+pattern+=+"abc:"
var+buffer+=+Array(pattern.utf8).map+{+Int8($0)+}

while++true+{
++++let+option+=+Int(getopt(C_ARGC,+C_ARGV,+buffer))
++++if+option+==+-1+{
++++++++break
++++}
++++switch+"\(UnicodeScalar(option))"
++++{
++++case+"a":
++++++++aFlag+=+1
++++++++println("Option+-a")
++++case+"b":
++++++++bFlag+=+1
++++++++println("Option+-b")
++++case+"c":
++++++++cValue+=+String.fromCString(optarg)!
++++++++println("Option+-c+\(cValue)")
++++case+"?":
++++++++let+charOption+=+"\(UnicodeScalar(Int(optopt)))"
++++++++if+charOption+==+"c"+{
++++++++++++println("Option+'\(charOption)'+requires+an+argument.")
++++++++}+else+{
++++++++++++println("Unknown+option+'\(charOption)'.")
++++++++}
++++++++exit(1)
++++default:
++++++++abort()
++++}
}
println("aflag+='\(aFlag)',+bflag+=+'\(bFlag)'+cvalue+=+'\(cValue)'")

for+index+in+optind..<C_ARGC+{
++++println("Non-option+argument+'\(String.fromCString(C_ARGV[Int(index)])!)'")
}|code-block|syntax|javascript|111189|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|20|0|0|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@$D|V|E|W|1|X]]|A|$]]|$1|F|3|G|5|6|7|Y|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|Z|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|C]]]]

Anyone who wants to use the old "getopt" (which is available in Swift) can use this as reference. I made a Swift port of the GNU example in C one can find at:

<a href="http://www.gnu.org/software/libc/manual/html_node/Example-of-Getopt.html">http://www.gnu.org/software/libc/manual/html_node/Example-of-Getopt.html</a>

with a full description. It's tested and fully functional. It doesn't require Foundation either.

<pre><code>var aFlag = 0
var bFlag = 0
var cValue = String()

let pattern = "abc:"
var buffer = Array(pattern.utf8).map { Int8($0) }

while true {
 let option = Int(getopt(C_ARGC, C_ARGV, buffer))
 if option == -1 {
 break
 }
 switch "\(UnicodeScalar(option))"
 {
 case "a":
 aFlag = 1
 println("Option -a")
 case "b":
 bFlag = 1
 println("Option -b")
 case "c":
 cValue = String.fromCString(optarg)!
 println("Option -c \(cValue)")
 case "?":
 let charOption = "\(UnicodeScalar(Int(optopt)))"
 if charOption == "c" {
 println("Option '\(charOption)' requires an argument.")
 } else {
 println("Unknown option '\(charOption)'.")
 }
 exit(1)
 default:
 abort()
 }
}
println("aflag ='\(aFlag)', bflag = '\(bFlag)' cvalue = '\(cValue)'")

for index in optind..&lt;C_ARGC {
 println("Non-option argument '\(String.fromCString(C_ARGV[Int(index)])!)'")
}
</code></pre>

blocks|key|4617349|text|在Swift+3中，使用CommandLine枚举而不是Process|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4617350|所以：|4617351|let+arguments+=+CommandLine.arguments|code-block|syntax|javascript|4617352|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/reference/swift/commandline^0|C|B|S|7|C|B|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@$9|Z|A|10|1|11]]|E|$]]|$1|F|3|G|5|6|7|12|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|13|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

In Swift 3 use <a href="https://developer.apple.com/reference/swift/commandline"><code>CommandLine</code></a> enum instead of <code>Process</code>

So:

<pre><code>let arguments = CommandLine.arguments
</code></pre>

How do you access command line arguments for a command line application in Swift?

How do you access command line arguments in Swift?

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