FOR (file statement) - QB64 Wiki

FOR (file statement)

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FOR is used in a OPEN statement to select the filemode to open the file with.


Syntax:

OPEN ... FOR {APPEND|BINARY|INPUT|OUTPUT|RANDOM}


Description:

  • If FOR isn't used in a OPEN statement then the default filemode RANDOM is used.
    • APPEND - Keeps the information of the file intact while you can insert information at the end of it, writing permission only.
    • BINARY - Opens the file in binary mode, use this with binary files.
    • INPUT - Opens the file for viewing only.
    • OUTPUT - The entire contents of the file is erased while you can put new information inside it, writing permission only.
    • RANDOM - The default, you can get/put records defined by a record length (the variables type or LEN=length).


Code Examples:

Warning: Make sure you don't have a file named test.tst before you run this! It will be overwritten if so!

CLS OPEN "test.tst" FOR OUTPUT AS #1 PRINT #1, "If test.tst didn't exist:" PRINT #1, "A new file was created named test.tst and then deleted." PRINT #1, "If test.tst did exist:" PRINT #1, "It was overwritten with this and deleted." CLOSE #1 OPEN "test.tst" FOR INPUT AS #1 DO UNTIL EOF(1) INPUT #1, a$ PRINT a$ LOOP CLOSE #1 KILL "test.tst" END

If test.tst didn't exist: A new file was created named test.tst and then deleted. If test.tst did exist: It was overwritten with this and deleted.



See also:




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