GWBASIC User's Manual

GW-BASIC User's Guide
188 n FIELD Actual FIELD data buffer. Size is determined by S:switch.
VRECL bytes are transferred between BUFFER and FIELD on I/
O operations. Use this offset to examine file data in random I/O
mode.
Example 1:
100 X=VARPTR(Y)
When executed, the variable X will contain an address that points to the storage space assigned to
the variable Y.
Example 2:
10 OPEN "DATA.FIL" AS #1
20 FCBADR = VARPTR(#1)
30 DATADR = FCBADR+188
40 A$ = PEEK(DATADR)
In line 20, FCBADR contains the start of FCB.
In line 30, DATADR contains the address of the data buffer.
In line 40, A$ contains the first byte in the data buffer.
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