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Friday, February 21, 2014
ASSUME DS: DATA, CS: CODE
DATA SEGMENT
FILEC DB 'D:\MPLAB\SEM4.TXT$', 0 ;FILEC array is
declared to create a file SEM4.txt in D
; directory under MPLAB folder.
FILED DB 'D:\MPLAB\123.TXT$', 0 ;FILED array is declared to delete a file123.txt
which is
;already
created in D directory under MPLAB
folder.
MSG1 DB 0AH, 0DH, 'FILE IS CREATED', '$'
MSG2 DB 0AH, 0DH, 'FILE IS NOT CREATED', '$'
MSG3 DB 0AH, 0DH,'FILE IS DELETED', '$'
MSG4 DB 0AH, 0DH,'FILE IS NOT DELETED', '$'
MSG5 DB 0AH, 0DH,'CREATED FILE IS : ', '$'
MSG6 DB 0AH, 0DH,'DELETED FILE IS : ', '$'
DATA ENDS ; end of data
segment
DISP MACRO MSG ; DISP macro definition starts
MOV DX, OFFSET MSG ; display the message whose offset is in
DX
MOV AH, 09H ; using 09H with DOS 21H interrupt.
INT 21H
ENDM ; end of macro
definition
CODE SEGMENT
START: MOV AX, DATA ; data segment
initialization
MOV DS, AX
MOV DX, OFFSET FILEC ; DX: offset address of
FILEC array containing the drive,
;directory path and filename to be
created.
MOV CX, 00 ; CX
is cleared indicating no attributes for the file. (read only)
MOV AH, 3CH ; service no. to create file with DOS 21H
interrupt
INT 21H ; file is created
JC NOTCRE ; if carry flag is set to 1, it
indicates that file is not created,
;
then jump to
label NOTCRE
DISP MSG1 ; otherwise invoke the macro to display MSG1 (created)
DISP MSG5 ; invoke the macro to display MSG5
(created file is)
DISP FILEC ;invoke the macro
to display FILEC
array contents.
JMP NEXT ;
jump
to label NEXT to delete the file.
NOTCRE: DISP
MSG2 ; invoke
the macro to display MSG2 (file is not created)
NEXT:
MOV DX, OFFSET FILED ;DX: offset address of FILED array containing the drive,
; directory path and filename to be
deleted.
MOV AH, 41H ; service
number to delete a file with DOS 21 H interrupt
INT 21H ; file is deleted
JC NOTDEL ; if carry flag is set to 1, it
indicates that file is not deleted,
;
jump to label NOTDEL
DISP MSG3 ; invoke the macro to display MSG3
(file is deleted)
DISP MSG6 ; invoke the macro to display MSG6
(deleted file is)
DISP FILED ;invoke the macro to display FILED array contents.
NOTDEL:DISP MSG4 ;
invoke
the macro to display MSG4 (file is
not deleted)
EXIT: MOV AH, 4CH ; terminate the program
INT 21H
CODE ENDS ; end
of code segment
END START ; end
of program
Output:
D:\MASM>
Masm 12a.asm;
D:\MASM>
Link 12a.obj;
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