unique

Generating a Hardware-ID on Windows

What is the best way to generate a unique hardware ID on Microsoft Windows with C++ that is not easily spoofable (with for example changing the MAC Address)? ...

Unique class type Id that is safe and holds across library boundaries

I would appreciate any help as C++ is not my primary language. I have a template class that is derived in multiple libraries. I am trying to figure out a way to uniquely assign an id int to each derived class. I need to be able to do it from a static method though, ie. template < class DERIVED > class Foo { public: static int s_id...

Unique hardware ID in Mac OS X

Mac OS X development is a fairly new animal for me, and I'm in the process of porting over some software. For software licensing and registration I need to be able to generate some kind of hardware ID. It doesn't have to be anything fancy; Ethernet MAC address, hard drive serial, CPU serial, something like that. I've got it covered on W...

is there any function to generate a UNIQUE string or UNIQUE number ?

I need for function to generate a UNIQUE string, like: DIM uniStr as string = generateUniStr() is there any function already do this ? ...

Changing table field to UNIQUE

I want to run the following sql command: ALTER TABLE `my_table` ADD UNIQUE ( `ref_id` , `type` ); The problem is that some of the data in the table would make this invalid, therefore altering the table fails. Is there a clever way in MySQL to delete the duplicate rows? ...

NHibernate - how to enforce uniquenes??

My scenario is as follows: I have some objects (Messages) that can be tagged So I have a Tag entity and many-to-many relationship The above is done and working Now, when tagging, I'd like to save new tags only if they don't exist (where existence is checked by tag title) if the tag already exists, I'd like it to be recognized and attac...

mysql unique index used as exception handling method in java

Hi All, I want to know whether is it a good idea to catch exception based on unique index of sql in java. i want to catch an exception like 'duplicate entry for 1-0' if so then handle exception otherwise insert properly in database table? ...

Removing Similar Elements in Matrix

I'm trying to figure out how to remove an element of a matrix in MATLAB if it differs from any of the other elements by 0.01. I'm supposed to be using all of the unique elements of the matrix as thresholding values for a ROC curve that I'm creating but I need a way to remove values when they are within 0.01 of each other (since we are as...

C#: How would you make a unique filename by adding a number?

I would like to create a method which takes either a filename as a string or a FileInfo and adds an incremented number to the filename if the file exists. But can't quite wrap my head around how to do this in a good way. For example, if I have this FileInfo var file = new FileInfo(@"C:\file.ext"); I would like the method to give me a...

Handling close-to-impossible collisions on should-be-unique values

There are many systems that depend on the uniqueness of some particular value. Anything that uses GUIDs comes to mind (eg. the Windows registry or other databases), but also things that create a hash from an object to identify it and thus need this hash to be unique. A hash table usually doesn't mind if two objects have the same hash be...

How to uniq an array case insensitive

As far as i know, the result of ["a", "A"].uniq is ["a", "A"] My question is: How do I make ["a", "A"].uniq give me either ["a"] or ["A"] ...

Remove dupes/sort from a Array of Associative Arrays in PHP

I have a array of associative arrays aa[] = ('Tires'=>100, 'Oil'=>10, 'Spark Plugs'=>4 ); aa[] = ('Tires'=>454, 'Oil'=>43, 'Spark Plugs'=>3 ); aa[] = ('Tires'=>34, 'Oil'=>55, 'Spark Plugs'=>44 ); aa[] = ('Tires'=>454, 'Oil'=>43, 'Spark Plugs'=>45 ); aa[] = ('Tires'=>34, 'Oil'=>55, 'Spark Plugs'=>433 ); aa[] = ('Tires'=>23, 'Oil'=>33...

c# call object by unique property

I have a class Referrals. When you create an object in the class, it checks that the input strings are unique (and therefore never allows duplicate objects). But when I find that input string str1 is equal to that of a previously created object, instead of creating a new object or just returning false, i want to change a property of the ...

unique value field based on another field in django

Preface: I am new to django and to db design. SUPEREDIT: I made some significant changes, so the answers before my changes may reference things not here. I apologize. I'll get right to the code: models.py: class Player(models.Model): name = models.CharField() class Team(models.Model): name = models.CharField() members = m...

how to get system unique id using vc++ code?

I'm new to vc++ language so I want to get system unique id using vc++ language. so please can anybody help me in coding how to get system unique id? ...

C++ compile time program wide unique numbers

I've come up with a solution to a problem but I'm not sure if it'll always work or just on my compiler. First, the problem: I've noticed in a number of situations it's desirable to have a template class that gets reinstantiated each time it's used even when given the same types (say your template class has static members that are initial...

Creating a game schedule with PHP _ Harder than I thought

I have an array of an unknown length which will always have an evenly divisible amount of values, for example: print_r($initialarray); Array ( [0] => 30 [1] => 31 [2] => 32 [3] => 33 [4] => 34 [5] => 35 ) I need to create sets: Set 1: 30 v 35; 31 v 34; 32 v 33; Set 2: 30 v 34; 31 v 33; 32 v 35; Set 3: 30 v 33; 31 v 32; 34 v 3...

Two columns in Mysql with uniqueness constraint between column1 and column2

Hi, Let us consider a user table: Username,email1,email2 Now, I want to make sure that no two rows in this table have any common email address. What would be the best way to ensure this ? E.g.: If table has row: "Bill,[email protected],[email protected]", then trying to insert a row like "Billy,[email protected],[email protected]" should give an ...

Commerce Server 2007: A duplicate value for unique key member GeneralInfo.Username found while building indices for profile

I found a couple other postings discussing this error, but my situation is slightly different than the others I've seen First let's get the platform/settings out of the way: * CS 2007 SP2 * Windows 2008 Server Standard x64 SP1 * Using the user name field instead of the email field. Field type is nvarchar. * User name is trimmed before...

What are some one-liners that can output unique elements of the nth column to another file?

I have a file like this: 1 2 3 4 5 6 7 6 8 9 6 3 4 4 4 What are some one-liners that can output unique elements of the nth column to another file? EDIT: Here's a list of solutions people gave. Thanks guys! cat in.txt | cut -d' ' -f 3 | sort -u cut -c 1 t.txt | sort -u awk '{ print $2 }' cols.txt | uniq perl -anE 'say $F[0] unless $...