Why does the parameterless Guid constructor generate an empty GUID?
Why does the parameterless Guid constructor generate an empty GUID rather than default to a generated one as with Guid.NewGuid()? Is there a particular use for an empty Guid? ...
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How should I store GUID in MySQL tables?
Do I use varchar(36) or are there any better ways to do it? ...
Outputting a GUID in VBScript ignores all text after it
I'm creating a GUID for use in a Classic ASP application, by using TypeLib. However, even a simple test such as writing the GUID out to the screen is giving me problems - it prints the GUID but ignores everything after it (e.g. HTML tags, additional words, anything). Here's the rudimentary code to test this: Set typeLib = Server.Creat...
Why are there dashes in a .NET GUID?
Why are there dashes in a .NET GUID? Are there dashes in most implementations of a GUID, or is it just a Microsoft thing? Signed, 741ecf77-9c92-4435-8e6b-85975bd13452 ...
How to create a GUID/UUID using the iPhone SDK
I want to be able to create a GUID/UUID on the iPhone but I can't see any way to do it. The intention is to be able to create keys for distributed data, that are all unique. Do I need some third-party code or is there a built in way to do this in the SDK? I have tried Googling it, but I could find anything. ...
How to generate Java code from an XSD that includes MSFT Serialization: GUID datatypes?
I have used the Jaxme 2 libraries before to generate Java code from .XSD files without a problem. I'm currently encountering a problem generating Java from an XSD file that contains a http://schemas.microsoft.com/2003/10/Serialization/ namespace. Some sample code from my .XSD is: <?xml version="1.0" encoding="utf-8"?> <xs:schema xmlns...
Remove autogenerate GUID column from Add Entry pages in Dynamic Data Web Application
I have a Dynamic Data Entities Web Application that uses a database with GUIDs as primary keys for tables. All of the GUID fields have the default value set to NEWID() so SQL Server will generate a new GUID for any record. However in my dynamic data web site, in the insert new entry pages the GUID field shows up and it is expected for th...
Is a VFP uniqueidentifier the same as a Guid?
Hi I'm converting a foxpro database to SQL Server and some of the keys are VFP-generated unique identifiers - GUIDs I assume. Are these valid uniqueidentifiers? Can I just use the bytes and convert them easily into a uniqueidentifier in SQL Server? Thanks, Craig ...
How do you create a COM DLL in Visual Studio 2008?
It's been ages since I've written a COM dll. I've made a couple of classes now, that inherit from some COM interfaces, but I want to test it out. I know I have to put a GUID somewhere and then register it with regsvr32, but what are the steps involved? Edit: Sorry, forgot to mention I'm using C++. ...
How Random is System.Guid.NewGuid()?
I know this may sounds like a pointless question, but hear me out... I basically want to know if I can trust the GUID to generate a value which will be unique 100% of the time and impossible to predict. I'm basically rolling my on login system for a website and want to know if the GUID is secure enough for session cookies. Any backgro...
UserName or guid UserID?
When saving data in different sql tables, is it best to use the GUID userID or simply use the username? is there a performance difference when using guid? ...
Why does one of my project's GUIDs change when I build the project in VS 2005?
For two of my VS 2005 C++ projects, VS wants to write to the .sln file when I build the projects. I have got a number of other VS 2005 C++ projects where this is not the case. It is a problem as due to the fact that we have ClearCase source control integrated with our VS 2005 installations and when we try and run an overnight build via...
GUIDs in DLLs (.Net)
I'm not very experienced in this area - so I've got a few questions. Firstly, do all .Net created DLLs have their own GUID? If not, my question is how do I get one and associate it with the DLL. Then the question is, how do I get the GUID of that dll - ie. given a DLL path (c:\some\path\to\a\file.dll) how do I determine its GUID? Also, ...
How to get "Guid" variable from http header in ASP.NET
The following line gives an error (cannot convert type "string" to "System.Guid") userId = Request.QueryString["id"]; is there any solution to pass Guid variable in http header Get? ...
Difference between creating Guid keys in C# vs. the DB
We use Guids as primary keys for entities in the database. Traditionally, we've followed a pattern of letting the database set the ID for an entity during the INSERT, I think mostly because this is typically how you'd handle things using an auto-increment field or whatever. I'm finding more and more that it's a lot handier to do key as...
How do I programmatically get the GUID of an application in .net2.0
I need to access the assembly of my project in C# .NET2.0. I can see the GUID in the 'Assembly Information' dialog in under project properties, and at the moment I have just copied it to a const in the code. The GUID will never change, so this is not that bad of a solution, but it would be nice to access it directly. Is there a way to ...
PubDate/Guid is essential to RSS? How I create a good RSS in Yahoo! Pipes if the source doesn't provide different dates for the items?
I am creating a Yahoo! Pipe to a news site but the feedless source doesn't have a date/time for each item. My RSS doesn't works very well: each update makes the RSS Reader, Google Reader for instance, to mark all readed items as unreaded again. Perhaps that's because of the lack of pubDate tag or incorrect guid tag. 1) How to create a "...
How to create a GUID in Python
How do I create a GUID in Python that is platform independent? I hear there is a method using ActivePython on Windows but it's Windows only because it uses COM. Is there a method using plain Python? ...
Platform-independent GUID generation in C++?
What is the best way to programmatically generate a GUID or UUID in C++ without relying on a platform-specific tool? I am trying to make unique identifiers for objects in a simulation, but can't rely on Microsoft's implementation as the project is cross-platform. Notes: Since this is for a simulator, I don't really need cryptographic...
Storing MySQL GUID/UUIDs
This is the best way I could come up with to convert a MySQL GUID/UUID generated by UUID() to a binary(16): UNHEX(REPLACE(UUID(),'-','')) And then storing it in a BINARY(16) Are there any implications of doing it this way that I should know of? ...