Function 27h Random Block Read From File Specified by Struct -FCB
Similar to 21h (Random Read) except allows multiple files to be read.
entry AH 27h
CX number of records to be read
DS:DX address of an opened Struct -FCB
return AL 00h successful read
01h end of file, no data read
02h DTA too small for record size specified (read canceled)
03h end of file
CX actual number of records read (includes partial if AL=03h)
note 1) The record size is specified in the FCB. The service updates the Current
Block (offset 0Ch) and Current Record (offset 20h) fields to the next
record not read.
2) If CX contained 0 on entry, this is a NOP.
3) If the DTA is larger than the file, the file is padded to the requested
length with zeroes.
4) This function assumes that the FCB record size field (0Eh) is correctly
set. If not set by the user, the default is 128 bytes.
5) The record is written to disk at the current DTA address as specified
by the most recent call to function 1Ah. If the size of the record and
location of the DTA are such that a segment overflow or wraparound would
occur, the error return is set to AL=02h
|file: /Techref/INT/21f/27.htm, 1KB, , updated: 1999/4/26 11:31, local time: 2023/12/9 03:14,
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