如何从SWIFT中的字符串获取MD5哈希码并生成桥头 [英] How to get MD5 hash from string in SWIFT and make bridge-header

问题描述

我甚至没有预料到这个问题，但似乎。我尝试从swift中获取字符串的md5哈希值。我在SO上搜索，假设我需要像这样导入库：

  #import< CommonCrypto / CommonCrypto.h> ; 
  

首先编译器说'＃'不好。然后我删除了，编译器说'<'不好。
我试图找出并找到建议添加名为CommonCrypto的文件夹并创建一个名为module.map的文件。我无法理解如何使用此扩展名创建文件。好的，我创建了swift文件并替换了它的扩展名。然后在那里写代码：

  module CommonCrypto [system] {
 header/ usr / include / CommonCrypto / CommonCrypto。 h
 export * 
} 
  

并且再次不行
然后建议在项目设置$ {SRCROOT} / CommonCrypto中将新模块添加到Swift编译器下的导入路径 - 搜索路径中。

并且再次不好。

我不敢相信它很难做到这一点。我想我误解了一些步骤或什么。如果你知道一步一步的答案，请帮忙））

解决方案

您需要添加一个桥接头并添加 #import< CommonCrypto / CommonCrypto.h> 语句。

添加桥接头的最简单方法是添加Objective-C文件到项目中，您将会ig希望添加一个桥接标题，答复yes。之后，您可以删除已添加的Objective-C文件。

示例代码：

  func md5（#string：String） - > NSData {
 var digest = NSMutableData（length：Int（CC_MD5_DIGEST_LENGTH））！ 
 if data：NSData = string.dataUsingEncoding（NSUTF8StringEncoding）{
 CC_MD5（data.bytes，CC_LONG（data.length），
 UnsafeMutablePointer< UInt8>（digest.mutableBytes））
 
返回摘要
 
 
 //测试：
 let digest = md5（string：这是测试字符串）
 println （digest：\（digest））
  

输出：

摘要：8f833933 03a151ea 33bf6e3e bbc28594

这是一个更为Swift 2.0的版本返回一个 UInt8 数组：

  func md5（string string：String ） - > [UInt8] {
 var digest = [UInt8]（count：Int（CC_MD5_DIGEST_LENGTH），repeatedValue：0）
 if data = string.dataUsingEncoding（NSUTF8StringEncoding）{
 CC_MD5（data.bytes ，CC_LONG（data.length），& digest）
} 
 
 return digest 
} 
  

i dont even expect this problem, but it appears. I try to get md5 hash from string in swift. I search about that on SO and assume that i need to import library like that:

#import <CommonCrypto/CommonCrypto.h>

First of all compiler said that '#' is not okay. Then i removed and compiler said that '<' is not okay. I tried to figure out that and find recommendations to add folder named "CommonCrypto" and create a file named "module.map". I cant understand how to create file with this extension. Okay, i create swift file and replace its extension. Then write code there:

module CommonCrypto [system] {
    header "/usr/include/CommonCrypto/CommonCrypto.h"
    export *
}

and again its not okay Then in recommendations was adding the new module to Import Paths under Swift Compiler – Search Paths in your project settings ${SRCROOT}/CommonCrypto).

and its again not okay.

i cant belive that its so difficult to do that. i think i misunderstand some steps or something. if you know step by step answer please help))

解决方案

You need to add a bridging header and add the #import <CommonCrypto/CommonCrypto.h> statement to it.

The easiest way to add a bridging header is to add an Objective-C file to the project, you will be aked ig you want to add a bridging header, reply yes. After that you can delete the Objective-C file file that was added.

Example code:

func md5(#string: String) -> NSData {
    var digest = NSMutableData(length: Int(CC_MD5_DIGEST_LENGTH))!
    if let data :NSData = string.dataUsingEncoding(NSUTF8StringEncoding) {
        CC_MD5(data.bytes, CC_LONG(data.length),
            UnsafeMutablePointer<UInt8>(digest.mutableBytes))
    }
    return digest
}

//Test:
let digest = md5(string:"Here is the test string")
println("digest: \(digest)")

Output:

digest: 8f833933 03a151ea 33bf6e3e bbc28594

Here is a more Swift 2.0 version returning an array of UInt8:

func md5(string string: String) -> [UInt8] {
    var digest = [UInt8](count: Int(CC_MD5_DIGEST_LENGTH), repeatedValue: 0)
    if let data = string.dataUsingEncoding(NSUTF8StringEncoding) {
        CC_MD5(data.bytes, CC_LONG(data.length), &digest)
    }

    return digest
}

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