SessionStorage is per tab/window, so you can define a random number in sessionStorage and get it at first if exists: var tabID = sessionStorage.tabID ? sessionStorage.tabID : sessionStorage.tabID = Math.random(); UPDATE: In some cases, you may have same sessionStorage in multiple tabs (e.g. when you duplicate tab). In that case, following code may help: var … Read more
Another solution is to use a licensing technology with a dongle. This is a small device that plugs into USB or another I/O port on the host, and serves as a unique, physical key to activate the software. A third solution is to provide a license manager. That is, when the software starts up, it … Read more
Here’s an example of a commit object file, decompressed. commit 238tree 0de83a78334c64250b18b5191f6cbd6b97e77f84 parent 6270c56bec8b3cf7468b5dd94168ac410eca1e98 author Michael G. Schwern <schwern@pobox.com> 1659644787 -0700 committer Michael G. Schwern <schwern@pobox.com> 1659644787 -0700 feature: I did something cool The commit ID is a SHA-1 hash of that. $ openssl zlib -d < .git/objects/81/2e8c33de3f934cb70dfe711a5354edfd4e8172 | sha1sum 812e8c33de3f934cb70dfe711a5354edfd4e8172 – This includes… Full … Read more
The problem with MAC address is that there can be many network adapters connected to the computer. Most of the newest ones have two by default (wi-fi + cable). In such situation one would have to know which adapter’s MAC address should be used. I tested MAC solution on my system, but I have 4 … Read more
HTML <div class=”myDirective”> <input type=”checkbox” id=”myItem_{{$id}}” /> <label for=”myItem_{{$id}}”>open myItem_{{$id}}</label> </div>
You may keep it in KeyChain -(NSString *)getUniqueDeviceIdentifierAsString { NSString *appName=[[[NSBundle mainBundle] infoDictionary] objectForKey:(NSString*)kCFBundleNameKey]; NSString *strApplicationUUID = [SSKeychain passwordForService:appName account:@”incoding”]; if (strApplicationUUID == nil) { strApplicationUUID = [[[UIDevice currentDevice] identifierForVendor] UUIDString]; [SSKeychain setPassword:strApplicationUUID forService:appName account:@”incoding”]; } return strApplicationUUID; }
You’re correct that it cannot guarantee uniqueness, however there are approximately 3.402823669209387e+38 different values in a 32 digit hex value (16^32). That means that, assuming the math behind the algorithm gives a good distribution, your odds are phenomenally small that there will be a duplicate. You do have to keep in mind that it IS … Read more
Here’s a code snippet showing how to insert a GUID using a parameterised query: using(SqlConnection conn = new SqlConnection(connectionString)) { conn.Open(); using(SqlTransaction trans = conn.BeginTransaction()) using (SqlCommand cmd = conn.CreateCommand()) { cmd.Transaction = trans; cmd.CommandText = @”INSERT INTO [MYTABLE] ([GuidValue]) VALUE @guidValue;”; cmd.Parameters.AddWithValue(“@guidValue”, Guid.NewGuid()); cmd.ExecuteNonQuery(); trans.Commit(); } }
Why not just use ToString? public string generateID() { return Guid.NewGuid().ToString(“N”); } If you would like it to be based on a URL, you could simply do the following: public string generateID(string sourceUrl) { return string.Format(“{0}_{1:N}”, sourceUrl, Guid.NewGuid()); } If you want to hide the URL, you could use some form of SHA1 on the … Read more
Check into this thread,. However you should be careful as it’s documented as “can change upon factory reset”. Use at your own risk, and it can be easily changed on a rooted phone. Also it appears as if some manufacturers have had issues with their phones having duplicate numbers thread. Depending on what your trying … Read more