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Function  21h  Random Read from File Specified by File Control Block     (FCB) 

Reads one record as specified in the Struct -FCB into the current DTA.

entry AH 21h

DS:DX address of the opened Struct -FCB

return AL 00h successful read operation

01h end of file (EOF), no data read

02h DTA too small for the record size specified

03h end of file (EOF), partial data read

note 1) The current block and current record fields are set to agree with the

random record field. Then the record addressed by these fields is read

into memory at the current Disk Transfer Address.

2) The current file pointers are NOT incremented this function.

3) If the DTA is larger than the file, the file is padded to the requested

length with zeroes.




file: /Techref/INT/21f/21.htm, 0KB, , updated: 1999/4/26 12:31, local time: 2024/4/14 14:16,
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