62 lines
1.2 KiB
NASM
62 lines
1.2 KiB
NASM
; 实验八-4: 文件删除程序
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; 功能: 使用DOS功能号41H删除文件
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; 说明: 警告：此操作不可恢复！
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DATAS SEGMENT
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FILENAME DB 'testfile.txt', 0 ; 要删除的文件名
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ERR_MSG DB 'File delete error!', 0DH, 0AH, '$'
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OK_MSG DB 'File deleted successfully!', 0DH, 0AH, '$'
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NO_FILE_MSG DB 'File does not exist!', 0DH, 0AH, '$'
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DATAS ENDS
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STACKS SEGMENT
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DB 64 DUP(?)
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STACKS ENDS
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CODES SEGMENT
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ASSUME CS:CODES, DS:DATAS, SS:STACKS
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START:
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MOV AX, DATAS
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MOV DS, AX
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; 删除文件 (功能号41H)
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; AH = 41H (删除文件功能号)
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; DS:DX = 文件名地址
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; AL必须为0
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LEA DX, FILENAME
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MOV AH, 41H
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MOV AL, 00H
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INT 21H
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; 检查删除是否成功
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; 注意：如果文件不存在，AX会返回错误
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JNC DELETE_SUCCESS
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; 检查是否是"文件未找到"错误 (错误码2)
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CMP AX, 02H
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JE FILE_NOT_FOUND
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; 其他错误
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LEA DX, ERR_MSG
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MOV AH, 09H
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INT 21H
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JMP PROGRAM_END
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FILE_NOT_FOUND:
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LEA DX, NO_FILE_MSG
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MOV AH, 09H
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INT 21H
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JMP PROGRAM_END
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DELETE_SUCCESS:
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LEA DX, OK_MSG
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MOV AH, 09H
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INT 21H
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PROGRAM_END:
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MOV AH, 4CH
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INT 21H
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CODES ENDS
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END START |