[英]how to write a file from user input[asm,dos]?
i want to make a procedure that creates a file when inputing the name of the file in the console,how can i do this? 我想做一个在控制台中输入文件名时创建文件的过程,我该怎么做? i've tried with those two procedures:
我已经尝试了这两个过程:
filenameStr db 13,0,13 dup("$")
createline db 10,13,"/c/ ","$"
space db " ","$"
filehandle dw 0
proc: 过程:
proc Createfile
mov dx,offset createline
mov ah,9h
int 21h
mov dx,offset space
mov ah,9h
int 21h
mov dx,offset filenameStr
mov bx,dx
mov [byte ptr bx],13 ;8+1+3+1
mov ah,0Ah
int 21h
mov dx,offset filenameStr + 2
mov ah,9h
int 21h
mov [byte ptr filenameStr+2+8],0
call OpenFile
xor bx,bx
call WipeClean
call CreateFile1
call CloseFile
call GetCommandLetter
endp CreateFile
and: 和:
proc CreateFile1
mov ah,3ch
mov cx,00000000b
lea dx,[filenameStr]
int 21h
mov [filehandle],ax
ret
endp CreateFile1
note: those procedures are not showed in the code since i've changed the code to my older code without the writing file procedures. 注意:这些过程未显示在代码中,因为我已将代码更改为较早的代码,而无需编写文件过程。
full program is here: 完整的程序在这里:
IDEAL
MODEL small
STACK 100h
DATASEG
szMsg1 db "Hi! What do you want to do?",10,13,10,13,"/h-help(see all the commands)",10,13,"/e-Exit",10,13,10,13,"$"
szHelloWorld db 10,13,"Hello World!",10,13,"$"
ErrorMsg db 10,13,"Illegal Command,Try again!",10,13,"$"
filenameStr db 13,0,13 dup("$")
help db 10,13,"HELP LIST:",10,13,"-----------",10,13,"Commands are:",10,13," /e-Exit",10,13," /h-help",10,13," /1-Says: 'Hello World!'",10,13,"$"
filename db ?,0
filehandle dw 0
ErrorOpenMsg db 'Error',10,13,'$'
FileNameLength db "file name consists of 8 letters max! (dont forget to add '.txt' at the end of the name: 'example.txt')",10,13,"/r/ ","$"
fileString db 255 dup (0)
space db " ","$"
CommandMsg db 10,13,"Enter your command:",10,13,"Command: ","$",10,13
filereaderline db "file's text:","$"
CODESEG
proc WipeClean
mov [byte ptr fileString + bx], 0
inc bx
cmp bx, 255
jb WipeClean
endp WipeClean
proc OpenFile
;Open file
mov ah,3Dh
xor al,al
lea dx,[filenameStr+2]
int 21h
jc openerror
mov [filehandle],ax
ret
openerror:
mov dx,offset ErrorOpenMsg
mov ah,9h
int 21h
ret
endp OpenFile
proc ReadFile
mov ah,3fh
mov bx,[filehandle]
mov cx,255
lea dx,[fileString]
int 21h
ret
endp ReadFile
proc DeleteFile
mov ah,41h
lea dx,[filenameStr+2]
int 21h
endp DeleteFile
proc DisplayFileString
mov ah,09h
lea dx,[fileString]
int 21h
endp DisplayFileString
proc KeyStroke
xor ax,ax
int 16h
endp KeyStroke
proc WriteToFile
mov ah,40h
mov bx,[filehandle]
mov cx,255
lea dx,[fileString]
int 21h
ret
endp WriteToFile
proc CloseFile
mov ah,3Eh
mov bx,[filehandle]
int 21h
ret
endp CloseFile
start:
mov ax, @data
mov ds, ax
mov ah,0
mov al,2
int 10h
mov dx,offset szMsg1
mov ah,9h
int 21h
jmp GetCommandLetter
_Error:
mov dx,offset ErrorMsg
mov ah,9h
int 21h
GetCommandLetter:
mov dx,offset CommandMsg
mov ah,9h
int 21h
mov ah, 1h
int 21h
mov bl,al
mov ah, 1h
int 21h
mov bh,al
compare:
cmp bl,'/'
jne _Error
cmp bh,'h'
je _help
cmp bl,'/'
jne _Error
cmp bh,'H'
je _help
cmp bl,'/'
jne _Error
cmp bh,'1'
je PrintLine
cmp bl,'/'
jne _Error
cmp bh,'e'
je _exit
cmp bl,'/'
jne _Error
cmp bh,'E'
je exit
mov dx,offset space
mov ah,9h
int 21h
mov dx,offset FileNameLength
mov ah,9h
int 21h
cmp bl,'/'
jne _Error
cmp bh,'r'
je GetFileName
cmp bl,'/'
jne _Error
cmp bh,'R'
je GetFileName
jmp _Error
_exit:
jmp exit
_help:
mov dx,offset help
mov ah,9h
int 21h
jmp GetCommandLetter
GetFileName:
mov dx,offset space
mov ah,9h
int 21h
mov dx,offset filenameStr
mov bx,dx
mov [byte ptr bx],13 ;8+1+3+1
mov ah,0Ah
int 21h
mov dx,offset filenameStr + 2
mov ah,9h
int 21h
mov [byte ptr filenameStr+2+8],0
call OpenFile
xor bx,bx
call WipeClean
call ReadFile
mov dx,offset filereaderline
mov ah,9h
int 21h
call DisplayFileString
call CloseFile
jmp GetCommandLetter
PrintLine:
mov dx, offset szHelloWorld
mov ah, 9h
int 21h
jmp GetCommandLetter
exit:
mov ax, 4c00h
int 21h
END start
Reading the DOS api you'll see that CreateFile and OpenFile are very similar functions. 阅读DOS api,您会发现CreateFile和OpenFile是非常相似的功能。 In your program you've successfully opened, but you fail on the creation because you made the same mistake as before when user @SepRoland helped you out.
在您的程序中,您已成功打开,但是创建失败,因为您遇到了与@SepRoland用户帮助您时相同的错误。 You forgot that the actual filename starts at offset 2 in the structure that you give to DOS.
您忘记了实际的文件名从给DOS的结构中的偏移量2开始。
proc CreateFile1
mov ah,3ch
mov cx,00000000b
lea dx,[filenameStr +2] <= Add the 2 here!
int 21h
jc ThisIsAnErrorOnCreatingAFile <= Do something with the carry flag!
mov [filehandle],ax
ret
endp CreateFile1
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