Open

Opens a file.

Open <File Name> for Output | Input | Append as #<File No.>

Parameters

<File Name>	The file name of the file to be opened (character string).
<File No.>	The file number (integer) assigned to the file that is opened.

Return Value

None.

Description

Opens the <File No.> specified for the file in order to allow I/O processing of data in the file on the Memory Card.

After the I/O processing of data has been completed, the Close command is used to close the file.

Specify the following values in I/O mode.

Input : When data is to be read in from the file.

Output: When data is to be written to the file.

Append: When data is to be added to the file.

Specify a positive integer from 0 to 15 in <File No.>.Note that multiple files cannot be simultaneously opened using a single <File No.>.

The following I/O can be used in place of the <File Name> until the specified <File No.> is closed using the Close command.

Sequential file I/O operations can be combined using the Input# statement for reading data and the Print# statement for writing data, etc.

When the Open command is executed For Input for a file that does not exist, it becomes an "Illegal function call".

Example
Read in data until the end of the file.

    Open "C:\input.dat" FOR INPUT As #1

    For I&=0 To 255 
        DATA$ = Input$(8,#1)
        DATA$(I&)=DATA$
        If Eof(1)<>0 Then Exit For 
    Next 

    Close #1