OM 6.5 – User ManualVisual Programming II > Files > File-Box > Introduction

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Introduction to the File-Box

Programming with the File-Box takes place in an internal editor, which resembles the OMLoop editor. Like OMLoop, File-Box can only be evaluated from outside the editor, in its container patch.

Iterations : OMLoop

Iterations: OMLoop

StreamFile : a Pointer to Read and Write Files in File-Box

This editor has one main additional feature : the StreamFile box.

Features

StreamFile is an indispensable element for the File-Box : it is required to read from a file, or write to a file.


	The StreamFile box represents a file pointer , that is : an access to a file on the computer drive a position in the file .

Use

Several StreamFile boxes can be used in a File-Box, if several files must be read or written at the same time.
A StreamFile box is added by default in the File-Box editor.
To add another StreamFile box, click on the icon in the upper right corner of the window.

Reading and Writing Files in File-Box : Functions of the "Files" Package

A number of functions of the package are used for writing or reading files in the Text-Box.

Access

To access these functions, go to Functions / Kernel / Files.

Features


	The file-write function writes something (its input) in a file.		The file-read-line function reads one line in a file.
	The file-write-line function writes a line (that is, its input and a line break) a file.		The file-eof-p function tells if the end of file has been reached.

Using Connate Functions

Reading and Writing Files

Inito


	The Initdo module performs an action before the iteration starts. It is a useful tool to read or write file headers.

Using Initdo in Iterative Processes

Designing an Iterative Process with the File-Box

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