uniqueidentifier

问题 I know that a question has already been asked about generating a unique ID for a machine but my question is slightly different. I want to know whether there are any other methods (API calls?) to get hardware information and NOT use WMI. I understand from MSDN that WMI is introduced in Win2000 so it doesnt seem to be available in Win98. I have an application that has to run even on Win98 (I know it sucks but what can you do?) and still get hold of hardware information. 回答1: I've done this

问题 I'm trying to upload an application to AppStore but soon as its uploading I get this error: Your app contains non public API usage. Please review the errors, correct them, and submit your app again. Apps are not permitted to use the UDID, and must not use the unique identifier method of UIDevice. Please update your app's servers to associate with the vendor or advertising identifier introduced in iOS6. Shouldn't these errors be displayed? I cant find any code that access the UDID. 回答1: You

问题 So there is this software. When installed it somehow (probably reads file or registry entry) recognizes my windows operating system. It's supposed to do some tasks only once per unique computer. If I uninstall the program and re install it, the software remembers that it has been installed and therefore do not do the task. If I use system restore, software also does not do the tasks. If I load image of the system before the install, software also doesn't do the tasks. If I re install a fresh

问题 When talking about unique Android ID's, I'm sure everyone has seen this, however I too am trying to come up with a solution to uniquely identify any android device. I would be happy to use a publicly released class but I am yet to find one. In my situation, the requirement is to be able to uniquely identify any devices that have some form of an internet connection (such as GPRS or Wi-Fi) and run on API level 8 (v2.2 Froyo). I'm not aware of any devices that doesn't have Wi-Fi or a SIM so let

问题 Why does aspnet_users use guid for id rather than incrementing int? Also is there any reason no to use this in other tables as the primary key? It feels a bit odd as I know most apps I've worked with in the past just use the normal int system. I'm also about to start using this id to match against an extended details table for extra user prefs etc. I was also considering using a link table with a guid and an int in it, but decided that as I don't think I actually need to have user id as a

问题 I'm in the process of designing a fairly complex system. One of our primary concerns is supporting SQL Server peer-to-peer replication. The idea is to support several geographically separated nodes. A secondary concern has been using a modern ORM in the middle tier. Our first choice has always been Entity Framework, mainly because the developers like to work with it. (They love the LiNQ support.) So here's the problem: With peer-to-peer replication in mind, I settled on using uniqueidentifier

问题 So, since Apple is now rejecting apps that access UDID, on our company's current project, we need to eliminate all APIs that make a call to this property: [[UIDevice currentDevice] uniqueIdentifier] We have eliminated all the calls in our own code, but need to be sure that the many external libraries we are using are not making calls to this property. What is the most reliable method for determining if a library is calling on this property? Thank you in advance! 回答1: Aside from using otx

问题 I need to get the hardware serial code of Android device where my app is installed. This hardware serial number is the one that you can see on Settings > About Device > Status > Serial number . I though I would get it using Settings.Secure.ANDROID_ID or android.os.Build.SERIAL , but neither of them worked, meaning that they didn't give me unique identifier I'm looking for. For instance android.os.Build.SERIAL got me the unique ID shown on ADB when you run the command adb devices . Notice that

问题 I am using rand() for a 6 digit field which needs unique values. Am I doing it right? What are the odds, rand() can give me similar values on consecutive or frequent calls? It was unique when I used rand(). But, returned same number when I called srand(time(NULL)) or srand(clock()) . Seems, like it's working opposite for me. Or is it? 回答1: As others have pointed out, uniqueness is not guaranteed. However you are probably seeing repeated numbers because you are using srand() and rand()

问题 What is the best way to generate a unique ID in java. People generally use String id = System.currentTimeMillis+ someStaticCounter; But this approach would require synchronization in multithreaded applications. I am using try { Thread.sleep(1); //This sleep ensures that two consecutive calls from the same thread does not return the same id. } catch (InterruptedException e) { // do nothing; } id = System.currentTimeMillis() + "-" + Thread.currentThread().getId(); This approach helps me from