READT

The READT statement is used to read a range of tape devices 0-9.

COMMAND SYNTAX

READT variable {FROM expression} THEN|ELSE statements

SYNTAX ELEMENTS

variable is the variable that will receive any data read from the tape device.

expression should evaluate to an integer value in the range 0-9 and specifies from which tape channel to read data. If the FROM clause is not specified the READT will assume channel 0.

If the READT fails then the statements associated with any ELSE clause will be executed. SYSTEM(0) will return the reason for the failure as follows:

NOTES

A "tape" does not refer to magnetic tape devices only but any device that has been described to jBASE.

If no tape device has been assigned to the channel specified then the jBASE debugger is entered with an appropriate message.

Each instance of the READT statement will read the next record available on the device. The record size is not limited to a single tape block and the entire record will be returned whatever block size has been allocated by the T-ATT command.

EXAMPLE

LOOP
    READT TapeRec FROM 5 ELSE
        Reason = SYSTEM(0)
        IF Reason = 2 THEN BREAK ;* done
        CRT "ERROR"; STOP
    END
REPEAT

jBC