与传统的迅速C端的应用程序进行交互 [英] Interact with legacy C terminal app from swift

问题描述

我想与斯威夫特的旧的C端的应用进行互动。我已经成功地集成了源$ C ​​$ c和桥接头从C到斯威夫特。在code编译并从X $ C $运行Ç6.3测试版。我已经改名为终端应用程序的主入口点：

I'm trying to interact with an old C terminal app from Swift. I've successfully integrated the source code and bridged the headers from C to Swift. The code compiles and runs from Xcode 6.3 beta. I've renamed the terminal app's main entry point to:

int initialize(int argc, char **argv);

不过，我挣扎着从斯威夫特的参数传递给这个C函数。我的挑战是如何转换参数以正确的格式。从雨燕典型的输入将如下所示：

Nevertheless, I'm struggling to pass the arguments from Swift to this C function. My challenge is to convert the arguments in the right format. Typical input from Swift would look like:

let args = ["-c", "1.2.3.4", "-p", "8000"]

我试过用cStringUsingEncoding（NSUTF8StringEncoding）和withUnsafePointer搞乱，但至今没有运气。任何帮助是极大AP preciated！

I've tried messing with "cStringUsingEncoding(NSUTF8StringEncoding)" and "withUnsafePointer", but no luck so far. Any help is greatly appreciated!

推荐答案

C函数

int initialize(int argc, char **argv);

映射到斯威夫特

func initialize(argc: Int32, argv: UnsafeMutablePointer<UnsafeMutablePointer<Int8>>) -> Int32

这是一个可能的解决方案：

This is a possible solution:

let args = ["-c", "1.2.3.4", "-p", "8000"]

// Create [UnsafeMutablePointer<Int8>]:
var cargs = args.map { strdup($0) }
// Call C function:
let result = initialize(Int32(args.count), &cargs)
// Free the duplicated strings:
for ptr in cargs { free(ptr) }

它使用的事实，即在的strdup（$ 0）
雨燕字符串 $ 1,0 自动转换为C字符串，
在<一个解释href=\"http://stackoverflow.com/questions/27063569/string-value-to-unsafepointeruint8-function-parameter-behavior\">String价值UnsafePointer＆LT;＆UINT8 GT;功能参数的行为。

It uses the fact that in strdup($0) the Swift string $0 is automatically converted to a C string, as explained in String value to UnsafePointer<UInt8> function parameter behavior.

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