FileIOPermission Class

Article
04/11/2014

The FileIOPermission class controls the ability to access files and folders.

Syntax

class FileIOPermission extends CodeAccessPermission

Run On

Called

Methods

	Method	Description
	assert	Declares that the calling code can invoke an API that is protected by a permission. (Inherited from CodeAccessPermission.)
	cancelTimeOut	Cancels a previous method call to the setTimeOut method. (Inherited from Object.)
	copy	Creates and returns a copy of the current permission class object. (Overrides the copy Method.)
	demand	Checks the call stack to determine whether the permission that is required to invoke an API has been granted to the calling code. (Inherited from CodeAccessPermission.)
	equal	Determines whether the specified object is equal to the current one. (Inherited from Object.)
	getTimeOutTimerHandle	Returns the timer handle for the object. (Inherited from Object.)
	handle	Retrieves the handle of the class of the object. (Inherited from Object.)
	isSubsetOf	Determines whether the current permission is a subset of a specified permission. (Overrides the isSubsetOf Method.)
	new	Initializes a new instance of the CodeAccessPermission class. (Overrides the new Method.)
	notify	Releases the hold on an object that has called the wait method on this object. (Inherited from Object.)
	notifyAll	Releases a lock on the object that was issued by the wait method on this object. (Inherited from Object.)
	objectOnServer	Determines whether the object is on a server. (Inherited from Object.)
	owner	Returns the instance that owns the object. (Inherited from Object.)
	setTimeOut	Sets up the scheduled execution of a specified method. (Inherited from Object.)
	toString	Returns a string that represents the current object. (Inherited from Object.)
	usageCount	Returns the current number of references, that is, the value of the reference counter, that the object has. (Inherited from Object.)
	wait	Pauses a process. (Inherited from Object.)
	xml	Returns an XML string that represents the current object. (Inherited from Object.)

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Remarks

The FileIoPermission class is designed to check permissions for specific APIs. For a list of all APIs that are protected by permissions, see Secured APIs.

Before the protected API is run, you must call the assert method on the same tier, usually the server tier, that the corresponding CodeAccessPermission::demand method is called on. Call a method on the server tier from one of the following:

A server static method
A class instance method that is set to run on the server by using the RunOn class property

Examples

The following code example shows a new instance of the FileIoPermission class that specifies read access for the File.txt file.

The assert method is called to declare that the code can then call the AsciiIo.new method.

server static void main(Args args) 
{ 
    FileIoPermission _perm; 
    AsciiIo a; 
     
    _perm = new FileIoPermission("c:\\File.txt",'r'); 
    _perm.assert(); 
  
    // Invoke the protected API. 
    a = new AsciiIo("c:\\File.txt",'r'); 
}

Inheritance Hierarchy

Object Class
CodeAccessPermission Class
FileIOPermission Class

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