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美好的一天！我聽到一個代碼片斷，它使用視頻模式10h打印歡迎消息（菜單）。當按下4時，它應該從文件中讀取並在屏幕上顯示其內容。但是，它顯示垃圾值，我必須打開DosBox並重新安裝。
從文件中讀取並在程序集中輸出其內容
.model small
.stack 1024
.data
MENU DB 10,""
DB 10," Welcome " ;24
DB 10,""
DB 10,"1 Novice" ;3, 9
DB 10,"2 Boss" ;3, 6
DB 10,"3 Superb" ;3, 11
DB 10,"4 Scores"
DB 10,""
DB 10,"Choice: ","$" ;8
ROW1 DB 5
ROW2 DB 10
COL DB 25
Choice DB ?
; OTHER DECLARATIONS FOR COLORING I WON'T SHOW FOR SIMPLICITY
FileName DB "file.txt",0,8 ; name of file to open
Handle DW ? ; to store file handle
BufferSeg dw 0
ErrMsgOpen db "Error opening `"
FileLength dw 0
nextLine db 13,10
.code
DisplayFile PROC NEAR
;escape to video mode
mov ax,0A000h
mov es,ax
xor di,di
xor ax,ax
mov cx,32000d
cld
rep stosw
mov ax,cs
mov ds,ax
mov bx,ss
add bx,200h/10h ;get past the end of the file
mov [BufferSeg],bx ;store the buffer segment
;call WriteFile
push ds
mov ax,cs
mov ds,ax
mov ax,3d00h ;open file (ah=3dh)
mov dx,offset FileName
int 21h
mov bx,ax ;move the file handle into bx
mov ds,[BufferSeg]
mov dx,0 ;load to [BufferSeg]:0000
mov ah,3fh
mov cx,0FFFFh ;try to read an entire segments worth
int 21h
mov [cs:FileLength],ax
mov ah,3eh
int 21h ;close the file
cld
mov si,0
mov cx,[cs:FileLength]
PrintLoop:
mov ah,2
lodsb
mov dl,al
int 21h ;print a character
dec cx
jne PrintLoop
pop ds
ret
OpenError:
mov ah,9
mov dx,offset ErrMsgOpen
int 21h
pop ds
ret
DisplayFile ENDP
.STARTUP
mov ax, @data
mov ds, ax
@welcome:
mov ax, 3
int 10h
MOV AX, 3 ; 80x25 color
INT 10H ; video BIOS call
MOV AH, 2 ; set cursor position
MOV BH, 0 ; display page number
MOV DH, ROW1 ; row number
MOV DL, COL ; column number
INT 10H ; video BIOS call
LEA BP, ATT_BRICK ; point to first attribute array
CALL FAR PTR STICK ; display first line of video text
;scanf user's choice
mov ah, 01h
int 21h
sub al, '0'
mov Choice, al
; OTHER CODES
cmp al, 4
je @scores
@score:
call DisplayFile
@quit:
mov ax, 4c00h ;call dos to exit
int 21h
.EXIT
END
基本上它是一個遊戲，將結果保存在一個文件中。我可以正確地寫入文件，但是當我試圖從中讀取時，它不會在屏幕上輸出。請幫幫我。非常感謝你！
編輯：
這是一樣什麼DisplayScore proc near做，但在一個單獨的ASM文件（只是爲了測試，如果從文件中讀取的作品，它是）。
.MODEL SMALL
.STACK 200h
.CODE
Ideal
;===- Data -===
BufferSeg dw 0
ErrMsgOpen db "Error opening `"
FileName db "file.txt",0,8,"'$" ;8 is a delete character
;0 is required for filename
;(displays a space)
FileLength dw 0
buffer db "hehe$"
;===- Subroutines -===
PROC DisplayFile NEAR
push ds
mov ax,cs
mov ds,ax
mov ax,3d00h ;open file (ah=3dh)
mov dx,offset FileName
int 21h
jc OpenError
mov bx,ax ;move the file handle into bx
mov ds,[BufferSeg]
mov dx,0 ;load to [BufferSeg]:0000
mov ah,3fh
mov cx,0FFFFh ;try to read an entire segments worth
int 21h
mov [cs:FileLength],ax
mov ah,3eh
int 21h ;close the file
cld
mov si,0
mov cx,[cs:FileLength]
PrintLoop:
mov ah,2
lodsb
mov dl,al
int 21h ;print a character
dec cx
jne PrintLoop
pop ds
ret
OpenError:
mov ah,9
mov dx,offset ErrMsgOpen
int 21h
pop ds
ret
ENDP DisplayFile
;===- Main Program -===
START:
mov ax,cs
mov ds,ax
mov bx,ss
add bx,200h/10h ;get past the end of the file
mov [BufferSeg],bx ;store the buffer segment
;call WriteFile
call DisplayFile
mov ax,4c00h
int 21h
END START
你肯定'BufferSeg'有效嗎？你有嘗試過使用'int 21h' /'ah = 48h'來分配內存嗎？ – Michael
我試着在一個單獨的文件中將'DisplayScore proc near'分開，它可以工作，也就是說，它從文件中讀取並在屏幕上顯示內容。但是當我將它合併到視頻模式時，會發生垃圾值。請參閱編輯以查看單獨的asm文件，雖然它與DisplayScore相同。 –
原始代碼是否可以編譯？你有一個'je @ scores'，我認爲這是跳到下一行。但是這個標籤有'@ score'（不是'''）。 – Michael