MACROMEDIA FLASH MEDIA SERVER 2-SERVER MANAGEMENT ACTIONSCRIPT LANGUAGE Manuale Utente Scaricare il pdf (Pagina 48)

ADOBE FLASH MEDIA INTERACTIVE SERVER

Server-Side ActionScript Language Reference

File class

The File class lets applications write to the server’s file system. This is useful for storing information without using a

database server, creating log files for debugging, and tracking usage. Also, a directory listing is useful for building a

content list of streams or shared objects without using Flash Remoting.

By default, a script can access files and directories only within the application directory of the hosting application. A

server administrator can grant access to additional directories by specifying virtual directory mappings for File

object paths. This is done in the

FileObject tag in the Application.xml file, as shown in the following example:

<VirtualDirectory>/videos;C:\myvideos</VirtualDirectory>

<VirtualDirectory>/fmsapps;C:\Program Files\fms\applications</VirtualDirectory>

</FileObject>

This example specifies two additional directory mappings in addition to the default application directory. Any path

that begins with /videos—for example, /videos/xyz/vacation.flv—maps to c:/myvideos/xyz/vaction.flv. Similarly,

/fmsapps/conference maps to c:/Program Files/fms/applications/conference. Any path that does not match a

mapping resolves to the default application folder. For example, if c:/myapps/filetest is the application directory, then

/streams/hello.flv maps to c:/myapps/filetest/streams/hello.flv.

Note: You can use an Application.xml file at the virtual host level or at the application level. For more information, see

Adobe Flash Media Server Configuration and Administration Guide.

In addition, the following rules are enforced by the server:

• File objects cannot be created by using native file path specification.

• File object paths must follow the URI convention:

A slash (/) must be used as the path separator. Access is denied if a path contains a backslash (\), or if a dot (.) or

two dots (..) is the only string component found between path separators.

• Root objects cannot be renamed or deleted.

For example, if a path using a slash (/) is used to create a File object, the application folder is mapped.

Availability

Flash Media Server 2

Property summary

Property Description

File.canAppend Read-only; a boolean value indicating whether a file can be appended (true) or not

(false).

File.canRead Read-only; A boolean value indicating whether a file can be read (true) or not (false).

File.canReplace Read-only; A boolean value indicating whether a file was opened in "create" mode (true)

or not (

false). This property is undefined for closed files.

File.canWrite Read-only; a boolean value indicating whether a file can be written to (true) or not (false).

File.creationTime Read-only; a Date object containing the time the file was created.

File.exists Read-only; a boolean value indicating whether the file or directory exists (true) or not

(

false).

File.isDirectory Read-only; a boolean value indicating whether the file is a directory (true) or not (false).

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