在ios5中,UDID已不再被推薦使用,在將來的版本中,這個功能可能會消失。所以我們得探尋它的取代方法,能唯一標識設備的東西。往往硬件上有唯一標識,所以我們可以用硬件上的信息來取代UDID, 硬件上的MAC地址就能達到這樣的目的。
下面的函數就可以返回XX:XX:XX:XX:XX:XX類型的字符串(12個16進制數)
- #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;
- }
系統SKD也提供了一種方法得到標識字符串即UDID,如下:
- [[UIDevice currentDevice] uniqueIdentifier]
但打開UIDevice.h中你會發現這樣的定義與注釋
- @property(nonatomic,readonly,retain) NSString *uniqueIdentifier __OSX_AVAILABLE_BUT_DEPRECATED(__MAC_NA,__MAC_NA,__IPHONE_2_0,__IPHONE_5_0); // a string unique to each device based on various hardware info.
說明蘋果將逐漸淘汰這個屬性。
UUID在iOS4中也可以用,但不能保證在以後的系統升級後(iOS6 , 7)還能用。ios5中我還沒有測試過,因為現在手裡沒設備了(測了的朋友給我說說結果)。
在此也隨便把得到UUID的方法以寫出來:
- -(NSString*) uuid
- {
- CFUUIDRef puuid = CFUUIDCreate( nil );
- CFStringRef uuidString = CFUUIDCreateString( nil, puuid );
- NSString * result = (NSString *)CFStringCreateCopy( NULL, uuidString);
- CFRelease(puuid);
- CFRelease(uuidString);
- return [result autorelease];
- }
在這兒有兩個概念UUID與UDID.
UUID是Universally Unique Identifier 通用唯一標識碼
UDID是Unique Device Identifier 設備唯一標識碼
UDID只是UUID的一個了集而已。
目前我知道的就是用這些方法來唯一標識設備,如果你有更好的方法,也希望你能與大家分享。