来自< netinet/in.h>的INADDR_LOOPBACK宏；不能迅速导入 [英] INADDR_LOOPBACK macro from <netinet/in.h> not imported in swift

问题描述

我正在尝试使用没有文档的peertalk框架. 在他们的obj-c示例中，他们使用INADDR_LOOPBACK宏，并且示例正在运行. 但是，当我尝试快速执行相同操作时，系统抛出一个无法解析的标识符错误. 有人知道如何解决吗?

I'm trying to use the peertalk framework which has no documentation. On their obj-c example they use the INADDR_LOOPBACK macro, and example is working. But when i try to do the same in swift the system throw me an unresolved identifier error. Anyone knows how to fix it?

http://www.gnu. org/software/libc/manual/html_node/Host-Address-Data-Type.html

推荐答案

针对Swift 3的更新:从Swift 3开始，INADDR_LOOPBACK 被导入到Swift中.因此，添加

Update for Swift 3: As of Swift 3, INADDR_LOOPBACK is imported into Swift. Therefore it suffices to add

#include <netinet/in.h>

到桥接头文件，但不是自定义定义 不再需要了.

to the bridging header file, but a custom definition is not needed anymore.

旧答案:出于某种原因，宏定义

Old answer: For some reason, the macro definition

#define INADDR_LOOPBACK         (u_int32_t)0x7f000001

中的

不是 导入到Swift中. 问题可能是(u_int32_t)强制转换，因为 其他宏

from <netinet/in.h> is not imported into Swift. The problem might be the (u_int32_t) cast, because other macros like

#define INADDR_NONE             0xffffffff              /* -1 return */

已导入.

一种解决方案是定义

let INADDR_LOOPBACK = UInt32(0x7f000001)

在您的Swift代码中. 或者，添加

in your Swift code. Alternatively, add

#include <netinet/in.h>
const uint32_t kInAddrLoopback = INADDR_LOOPBACK;

到桥接头文件，并在Swift代码中使用kInAddrLoopback. 这不太容易出错，因为您不必重复常数.

to the bridging header file and use kInAddrLoopback in the Swift code. This is less error-prone because you don't have to repeat the constant.

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