## Argument.Handler

### Introduced

v4.0

### Description

Returns or sets the ArgumentHandler of the argument.
A null reference is returned when the argument has no handler. You may remove an argument handler by setting the handler property to a null reference.
You may also use a string to set an argument handler. The string must match the unique name of an argument handler. See siArgumentHandler for a complete list of the available argument handlers.
Warning: Calling this method flushes any existing value associated with the Argument, see Argument.Value.
Note: this method should not be confused with Command.Handler which returns the name of the script function that implements the command.

### C# Syntax

    // get accessor
    ArgumentHandler Argument.get_Handler();
    // set accessor
    Argument.set_Handler( Object out_ppArgumentHandler );

### Examples

#### JScript Example

    // JScript example demonstrating how you can
    // find out about ArgumentHandlers associated
    // with the arguments of a Command
    // Cleanup
    RemoveCommand("CmdWithHandler");
    // Command creation
    var oCmd = CreateCommand("CmdWithHandler");
    oCmd.Code = CmdImpl.toString(); // Embedded command
    oCmd.Language = "JScript";
    var oCmdArgs = oCmd.Arguments;
    var noValue;
    oCmdArgs.AddWithHandler("myArgument", "Collection");
    oCmdArgs.Add("myArgWithoutHandler", siArgumentInput, "defaultValue");
    AddCommand(oCmd);
    // display the arguments
    for (i=0; i < oCmdArgs.Count; i++)
    {
                    var currentArg = oCmdArgs(i);
                    var argHandler = currentArg.Handler;
                    if (null != argHandler)
                    {
                            LogMessage(currentArg.Name + " has the following handler: " + argHandler.Name );
                    }
                    else
                    {
                            LogMessage(currentArg.Name + " does not have a handler.");
                    }
    }
    // let's remove the argument handler
    var oArgWithHandler = oCmdArgs("myArgument");
    oArgWithHandler = noValue;
    // Implementation of the custom command
    function CmdImpl( collectionArg, basicArg )
    {
    }