AMP Program no.5

Write an  assignment on  ASCIIZ string, file  handle, file  functions 41H  (delete file), 56H (Rename file) of DOS INT 21H and program to simulate DEL (Delete file) and  REN
(Rename file) command.

Function 41H : delete file

This interrupt deletes a file from the specified or default disk or directory.

For its occurrence AH must be loaded with 41H

DS:DX contains the segment : offset of the filename

If function is successful:

Carry flag = clear

If function is unsuccessful

Carry flag = set

AX = error code

Function 56H : rename file

For its occurrence, AH must be loaded with 56h

DS:SI = segment: offset of current filename

ES:DI = segment: offset of new filename

If function is successful

Carry flag = clear

If function is unsuccessful

Carry flag = set

AX = error code  

Note that the file will not be renamed if the pathname does not exist

If the new filename already exists then also then also the file will not be renamed