The user does not have the permissions required to create or modify registry keys. Examples The following code example stores values of several data types in an example key, creating the key as it does so, and then retrieves and displays the values.
A function definition is an executable expression, whose value has type function. When Lua pre-compiles a chunk, all its function bodies are pre-compiled too.
Then, whenever Lua executes the function definition, the function is instantiated or closed. This function instance or closure is the final value of the expression. Different instances of the same function can refer to different external local variables and can have different environment tables.
Parameters act as local variables that are initialized with the argument values: A vararg function does not adjust its argument list; instead, it collects all extra arguments and supplies them to the function through a vararg expression, which is also written as three dots.
The value of this expression is a list of all actual extra arguments, similar to a function with multiple results. If a vararg expression is used inside another expression or in the middle of a list of expressions, then its return list is adjusted to one element.
If the expression is used as the last element of a list of expressions, then no adjustment is made unless that last expression is enclosed in parentheses. As an example, consider the following definitions: If control reaches the end of a function without encountering a return statement, then the function returns with no results.
The colon syntax is used for defining methods, that is, functions that have an implicit extra parameter self.
Thus, the statement function t. The scope of variables begins at the first statement after their declaration and lasts until the end of the innermost block that includes the declaration.
Consider the following example: Because of the lexical scoping rules, local variables can be freely accessed by functions defined inside their scope. A local variable used by an inner function is called an upvalue, or external local variable, inside the inner function. Notice that each execution of a local statement defines new local variables.
Each of these closures uses a different y variable, while all of them share the same x. Whenever an error occurs during Lua compilation or execution, control returns to C, which can take appropriate measures such as printing an error message.
Lua code can explicitly generate an error by calling the error function. If you need to catch errors in Lua, you can use the pcall function. This metatable is an ordinary Lua table that defines the behavior of the original value under certain special operations.
You can change several aspects of the behavior of operations over a value by setting specific fields in its metatable. If it finds one, Lua calls this function to perform the addition.
We call the keys in a metatable events and the values metamethods. In the previous example, the event is "add" and the metamethod is the function that performs the addition. You can query the metatable of any value through the getmetatable function.
You can replace the metatable of tables through the setmetatable function. Tables and full userdata have individual metatables although multiple tables and userdata can share their metatables. Values of all other types share one single metatable per type; that is, there is one single metatable for all numbers, one for all strings, etc.
A metatable controls how an object behaves in arithmetic operations, order comparisons, concatenation, length operation, and indexing. A metatable also can define a function to be called when a userdata is garbage collected. For each of these operations Lua associates a specific key called an event.
When Lua performs one of these operations over a value, it checks whether this value has a metatable with the corresponding event.
If so, the value associated with that key the metamethod controls how Lua will perform the operation. Metatables control the operations listed next.
Each operation is identified by its corresponding name. The semantics of these operations is better explained by a Lua function describing how the interpreter executes the operation.
The code shown here in Lua is only illustrative; the real behavior is hard coded in the interpreter and it is much more efficient than this simulation.
All functions used in these descriptions rawgettonumberetc.
The function getbinhandler below defines how Lua chooses a handler for a binary operation.SetValue(String, String, Object) SetValue(String, String, Object) SetValue(String, String, Object) SetValue(String, String, Object) Sets the specified name/value pair on the specified registry key.
If the specified key does not exist, it is created. Nov 16, · Hey, Scripting Guy! How can I create a new registry key?-- DL.
Hey, DL. First of all, for those of you who get all your news from the Hey, Scripting Guy! column (as if there was any other source for news and information?) we are happy to report that the University of Washington men’s basketball team defeated a very good Northern Iowa squad to win the Basketball Travelers Classic.
The Windows Registry is a hierarchical database that stores low-level settings for the Microsoft Windows operating system and for applications that opt to use the registry. The kernel, device drivers, services, Security Accounts Manager, and user interface can all use the registry.
The registry also allows access to counters for profiling system performance. This is the snippet Read All Lines from a Text File into a String Array on FreeVBCode.
The FreeVBCode site provides free Visual Basic code, examples, snippets, and . I'm trying to write to the registry using my C# app.
I'm using the answer given here: Writing values to the registry with C# However for some reason the key isn't added to the registry. contents · index · other versions · english · português · español.
1 – Introduction Lua is an extension programming language designed to support general procedural programming with data description facilities. It also offers good support for object-oriented programming, functional programming, and data-driven programming.