uniqueidentifier | 易学教程

Unique Identifier of a Mac?

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问题 On an iPhone I can use [[UIDevice currentDevice] uniqueIdentifier]; to get a string which identifies this device. Is there anything equal in OSX ? I didn't find anything. I just want to identify the Mac which started the application. Can you help me ? 回答1: Apple has a technote on uniquely identifying a mac. Here's a loosely modified version of the code Apple has posted in that technote... don't forget to link your project against IOKit.framework in order to build this: #import <IOKit/IOKitLib

.NET Short Unique Identifier

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问题 I need a unique identifier in .NET (cannot use GUID as it is too long for this case). Do people think that the algorithm used here is a good candidate or do you have any other suggestions? 回答1: This one a good one - http://www.singular.co.nz/blog/archive/2007/12/20/shortguid-a-shorter-and-url-friendly-guid-in-c-sharp.aspx and also here YouTube-like GUID You could use Base64: string base64Guid = Convert.ToBase64String(Guid.NewGuid().ToByteArray()); That generates a string like

Get Static NFC Tag Id with HCE mode

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I'm new in NFC thing, so I tested several phones with calling getTagId() method in HCE mode, and this is the result: device | UID LG G2 | random LG G3 | static S4 | random HTC One Mini | static Xiaomi mi3 | static My questions: Why do some phones have static UID and some do not? Is this chipset related? Is it possible to get a fixed UID? I need it to authenticate the device. On other side, I'm using Kitkat CyanogenMod 11 on Xperia M, but I did not manage to use it for HCE, why? Any documents that can explain/support the answer? Why do some phones have static UID and some do not? Is this

Always get a unique device id in iOS 7

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问题 Our iOS application is for specific users. So, we used device unique identifier for user identification. This approach works fine till iOS 6, because we are getting the same value every time. NSString *strUniqueIdentifier = [[UIDevice currentDevice] uniqueIdentifier]; In iOS 7, the above method is returning different values and we are getting issues in user identification. iOS 7 provides the following alternate . NSUUID *oNSUUID = [[UIDevice currentDevice] identifierForVendor];

What is a Git commit ID?

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How are the Git commit IDs generated to uniquely identify the commits? Example: 521747298a3790fde1710f3aa2d03b55020575aa How does it work? Are they only unique for each project? Or for the Git repositories globally? A Git commit ID is a SHA-1 hash of every important thing about the commit. I'm not going to list them all, but here's the important ones... The content, all of it, not just the diff. Commit date. Committer's name and email address. Log message. The ID of the previous commit(s). Change any of that and the commit ID changes. And yes, the same commit with the same properties will have

PHP session IDs — how are they generated? [duplicate]

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This question already has an answer here: How unique is the php session id 8 answers When I call session_start() or session_regenerate_id() , PHP generates what appears to be a random string for the session ID. What I want to know is, is it just a random sequence of characters, or is it like the uniqid() function? Because if it's just random characters, couldn't you theoretically run into a conflict? If User A logged in and then User B logged in and, though highly unlikely, User B generated the same session ID, then User B would end up accessing User A's account. Even if PHP checks to see if a

How to determine MAC Address of the actual physical network card — not virtual network interfaces created by VPN's (.NET C#)

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Background I'm trying to get obtain a unique identifier out of a computer and want to be able to reliably return the same MAC address each time. Trust me I have my reasons for using MAC address and have read many posts about alternate unique id methods (and yes i've considered if they don't have any network cards). Problem The problem is in .NET i don't see anyway to tell whether a specific NetworkInterface is a physical hardware network card from something like a "Nortel IPSECSHM Adapter - Packet Scheduler Miniport" which get added when you connect to certain VPNs or WiFi networks. I know how

How to create a multi-select parameter with a uniqueidentifier?

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问题 I am developing an SSRS 2008 R2 RDL file. Now, I am trying to add a report parameter which should be a multi-select. Previously I have worked with multi-select parameters but they have always been CHARACTER data types before. So in my main dataset my code was: ;WITH Cte AS ( SELECT 1 as id, CAST('<M>' + REPLACE( (select @IncidentType), ',' , '</M><M>') + '</M>' AS XML) AS Names ) SELECT id, Split.a.value('.', 'VARCHAR(MAX)') AS Names INTO #incident_types FROM Cte CROSS APPLY Names.nodes('/M')

Using the new Android Advertiser id inside an SDK

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问题 It makes a lot of sense that Android ad SDKs will use Android's the new advertiser id. It seems that you can only get the id by using the google services sdk, as mentioned here: http://developer.android.com/google/play-services/id.html. Using the google play services sdk, requires referencing the google-play-services_lib project, which causes several problems: A lot of SDKs are jars, meaning they can't use google-play-services_lib as is (because they can't include resources). If I only want

Hash function that produces short hashes?

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问题 Is there a way of encryption that can take a string of any length and produce a sub-10-character hash? I want to produce reasonably unique ID's but based on message contents, rather than randomly. I can live with constraining the messages to integer values, though, if arbitrary-length strings are impossible. However, the hash must not be similar for two consecutive integers, in that case. 回答1: You can use any commonly available hash algorithm (eg. SHA-1), which will give you a slightly longer