如何在目标C(iOS)中创建UUID类型1 [英] How to create UUID type 1 in objective C (iOS)

问题描述

我使用以下代码创建了UUID(不知道哪种类型):

I created UUID (don't know which type) with the following code:

// Create universally unique identifier (object)
CFUUIDRef uuidObject = CFUUIDCreate(kCFAllocatorDefault);

// Get the string representation of CFUUID object.
NSString *uuidStr = (__bridge NSString *)CFUUIDCreateString(kCFAllocatorDefault, uuidObject);

CFRelease(uuidObject);

但是我向其发送数据的API表示不是它需要的类型1 http://en.wikipedia.org/wiki/Universally_unique_identifier#Version_1_.28MAC_address.29 .

But my API that is send data to says that is not type 1 that it needs http://en.wikipedia.org/wiki/Universally_unique_identifier#Version_1_.28MAC_address.29.

如何在objC(iphone)中创建此type1 UUID?

How to create this type1 UUID in objC (iphone)?

我在使用obj C进行编译时遇到问题，是否可以使用C代码生成此代码?

I have problems making this in obj C, is it an option to use C code to generate this?

推荐答案

首先获取MAC地址:(来自开发者提示)

Get the MAC address first: (from developertips)

#include <sys/socket.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_dl.h>

...

- (NSString *)getMacAddress
{
  int                 mgmtInfoBase[6];
  char                *msgBuffer = NULL;
  size_t              length;
  unsigned char       macAddress[6];
  struct if_msghdr    *interfaceMsgStruct;
  struct sockaddr_dl  *socketStruct;
  NSString            *errorFlag = NULL;

  // Setup the management Information Base (mib)
  mgmtInfoBase[0] = CTL_NET;        // Request network subsystem
  mgmtInfoBase[1] = AF_ROUTE;       // Routing table info
  mgmtInfoBase[2] = 0;              
  mgmtInfoBase[3] = AF_LINK;        // Request link layer information
  mgmtInfoBase[4] = NET_RT_IFLIST;  // Request all configured interfaces

  // With all configured interfaces requested, get handle index
  if ((mgmtInfoBase[5] = if_nametoindex("en0")) == 0) 
    errorFlag = @"if_nametoindex failure";
  else
  {
    // Get the size of the data available (store in len)
    if (sysctl(mgmtInfoBase, 6, NULL, &length, NULL, 0) < 0) 
      errorFlag = @"sysctl mgmtInfoBase failure";
    else
    {
      // Alloc memory based on above call
      if ((msgBuffer = malloc(length)) == NULL)
        errorFlag = @"buffer allocation failure";
      else
      {
        // Get system information, store in buffer
        if (sysctl(mgmtInfoBase, 6, msgBuffer, &length, NULL, 0) < 0)
          errorFlag = @"sysctl msgBuffer failure";
      }
    }
  }

  // Befor going any further...
  if (errorFlag != NULL)
  {
    NSLog(@"Error: %@", errorFlag);
    return errorFlag;
  }

  // Map msgbuffer to interface message structure
  interfaceMsgStruct = (struct if_msghdr *) msgBuffer;

  // Map to link-level socket structure
  socketStruct = (struct sockaddr_dl *) (interfaceMsgStruct + 1);

  // Copy link layer address data in socket structure to an array
  memcpy(&macAddress, socketStruct->sdl_data + socketStruct->sdl_nlen, 6);

  // Read from char array into a string object, into traditional Mac address format
  NSString *macAddressString = [NSString stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X", 
                                macAddress[0], macAddress[1], macAddress[2], 
                                macAddress[3], macAddress[4], macAddress[5]];
  NSLog(@"Mac Address: %@", macAddressString);

  // Release the buffer memory
  free(msgBuffer);

  return macAddressString;
}

然后使用 rfc4122规范生成UUIDv1.阅读，您可以从其他语言移植代码，这是我发现的代码: https://github.com/fredriklindberg/class.uuid.php/blob/master/class.uuid.php

Then generate the UUIDv1 with the rfc4122 spec, if the spec is too long to read, you may port the code from other language, here's one that I found: https://github.com/fredriklindberg/class.uuid.php/blob/master/class.uuid.php

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