在程序集中写入文件
Write to file in Assembly
我的任务是将缓冲区和一些其他文本打印到文件中，当我使用这段代码时，我得到了错误的答案。输出缓冲区是可以的，它可以完美打印，但是当我尝试打印在数据中声明的文本时，开始出现无意义的情况。例如，当我尝试打印 "Hello (letters )" 时，它给了我这个 "Hello (9 spaces)(letters$)$"。当我为每个字符串编写 3 个不同的过程时，它会正确打印。伙计们，也许你能帮我找出问题所在？
model small
BufSize EQU 60
.stack 100h
.data
rez db "rez.txt",
Buf db BufSize dup (?)
handle dw ?
Letters db 0
brackets1 db " (letters$"
brackets2 db ")$"
.code
start:
MOV ax, @data
MOV ds, ax
MOV ah, 3Ch
MOV cx, 0
MOV dx, offset rez
INT 21h ;results file is created and opened
MOV handle, ax
MOV cx, 5 ;5 bytes ("Hello")
ADD cx,10 ;10 bytes from "(letters " and ")"
MOV bx, handle
CALL Write
MOV ah, 3Eh
MOV bx, handle
INT 21h ;close file
MOV ah, 4Ch
MOV al, 0
INT 21h
PROC Write
PUSH dx
MOV ah, 40h
MOV dx, offset Buf
INT 21h ;Write to file
MOV ah,40h
MOV dx,offset brackets1
INT 21h
MOV ah,40h
MOV dx,offset brackets2
INT 21h
POP dx
RET
RasykBuf ENDP
END start
我添加了一些省略的说明和新评论；我更正了一个编译错误：RasycBuf ENDP（Write 不是 PROCedure 的名称吗？）。每当你执行一个 I/O 操作时，你必须检查它是否成功完成，否则下一个 I/O 的操作会产生一个 运行-TIME 的错误。
我已经成功编译了这个源代码。
但是我不知道你想要它做什么，因为正如另一个用户所说，这个程序是不完整的。
model small
BufSize EQU 60
.stack 100h
.data
rez db "rez.txt", 0 ; NULL TERMINATOR WAS OMIT.
Buf db BufSize dup (32) ; CHARACTERS WITHOUT A PURPOSE (SPACES).
;handle dw ? ; NOT NEEDED.
;Letters db 0 ; NOT USED.
brackets1 db " (letters$"
brackets2 db ")$"
.code
start:
MOV ax, @data
MOV ds, ax
MOV ah, 3Ch
MOV cx, 0
MOV dx, offset rez
; AH -> 3CH, CREATE A FILE WITH HANDLE.
; CX -> Attribute for file:
; Bit0: read-only.
; Bit1: hidden.
; Bit2: system.
; Bit3: volume-label.
; Bit4: directory.
; Bit5: archive.
; Bit6: UNKNOWN.
; Bit7: shareable.
; DS:DX -> ASCIZ file-name (with optional drive and path).
; OUTPUT -> FCarry=1: ERROR, AX= error-code;
; FCarry=0: SUCCESSFULL, AX= file-handle.
INT 21h ; Results file is created and opened.
JB openfailed ; If error, exit.
;MOV handle, ax ; Not needed.
;MOV cx, 5 ; 5 bytes ("Hello")
;ADD cx, 10 ; 10 bytes from "(letters " and ")"
MOV bx, ax ; Copy file-handle into BX's reg.
CALL Write
MOV ah, 3Eh
;MOV bx, handle ; BX's reg. already contains handle.
; AH -> 3EH, CLOSE A FILE WITH HANDLE.
; BX -> File-handle
; OUTPUT -> FCarry=1: ERROR, AX= error-code;
; FCarry=0: SUCCESSFULL.
INT 21h ; Close file
openfailed:
MOV ah, 4Ch
MOV al, 0
; AH -> 4CH, QUIT WITH EXIT CODE (EXIT).
; AL -> EXIT CODE.
INT 21h
Write:
; I suppose that you want to write the content of the buffer (Buf),
; followed by brackets1 and brackets2 strings.
; NOTE: Buf CONTAINS ONLY CHARACTERS WITHOUT A PURPOSE !
;PUSH dx ; Because DX's reg. is only used here, don't need to PUSH/POP it
MOV ah, 40h
MOV cx, BufSize ; Size of Buf
MOV dx, offset Buf
; AH -> 40H, WRITE TO FILE WITH HANDLE
; BX -> Handle
; CX -> Buffer's size
; DS:DX -> Buffer
; OUTPUT -> FCarry=1: ERROR, AX= error-code;
; FCarry=0: SUCCESSFULL, AX= num. of byte written.
INT 21h ; Write to file
JB error ; If error, return
MOV ah, 40h
MOV cx, 10 ; Size of brackets1's string
MOV dx, offset brackets1
; AH -> 40H, WRITE TO FILE WITH HANDLE
; BX -> Handle
; CX -> Buffer's size
; DS:DX -> Buffer
; OUTPUT -> FCarry=1: ERROR, AX= error-code;
; FCarry=0: SUCCESSFULL, AX= num. of byte written.
INT 21h
JB error ; If error, return
MOV ah, 40h
MOV cx, 2 ; Size of brackets2's string
MOV dx, offset brackets2
; AH -> 40H, WRITE TO FILE WITH HANDLE
; BX -> Handle
; CX -> Buffer's size
; DS:DX -> Buffer
; OUTPUT -> FCarry=1: ERROR, AX= error-code;
; FCarry=0: SUCCESSFULL, AX= num. of byte written.
INT 21h
error:
;POP dx ; Because DX's reg. is only used here, don't need to PUSH/POP it
RET
END start
我的任务是将缓冲区和一些其他文本打印到文件中，当我使用这段代码时，我得到了错误的答案。输出缓冲区是可以的，它可以完美打印，但是当我尝试打印在数据中声明的文本时，开始出现无意义的情况。例如，当我尝试打印 "Hello (letters )" 时，它给了我这个 "Hello (9 spaces)(letters$)$"。当我为每个字符串编写 3 个不同的过程时，它会正确打印。伙计们，也许你能帮我找出问题所在？
model small
BufSize EQU 60
.stack 100h
.data
rez db "rez.txt",
Buf db BufSize dup (?)
handle dw ?
Letters db 0
brackets1 db " (letters$"
brackets2 db ")$"
.code
start:
MOV ax, @data
MOV ds, ax
MOV ah, 3Ch
MOV cx, 0
MOV dx, offset rez
INT 21h ;results file is created and opened
MOV handle, ax
MOV cx, 5 ;5 bytes ("Hello")
ADD cx,10 ;10 bytes from "(letters " and ")"
MOV bx, handle
CALL Write
MOV ah, 3Eh
MOV bx, handle
INT 21h ;close file
MOV ah, 4Ch
MOV al, 0
INT 21h
PROC Write
PUSH dx
MOV ah, 40h
MOV dx, offset Buf
INT 21h ;Write to file
MOV ah,40h
MOV dx,offset brackets1
INT 21h
MOV ah,40h
MOV dx,offset brackets2
INT 21h
POP dx
RET
RasykBuf ENDP
END start
我添加了一些省略的说明和新评论；我更正了一个编译错误：RasycBuf ENDP（Write 不是 PROCedure 的名称吗？）。每当你执行一个 I/O 操作时，你必须检查它是否成功完成，否则下一个 I/O 的操作会产生一个 运行-TIME 的错误。
我已经成功编译了这个源代码。
但是我不知道你想要它做什么，因为正如另一个用户所说，这个程序是不完整的。
model small
BufSize EQU 60
.stack 100h
.data
rez db "rez.txt", 0 ; NULL TERMINATOR WAS OMIT.
Buf db BufSize dup (32) ; CHARACTERS WITHOUT A PURPOSE (SPACES).
;handle dw ? ; NOT NEEDED.
;Letters db 0 ; NOT USED.
brackets1 db " (letters$"
brackets2 db ")$"
.code
start:
MOV ax, @data
MOV ds, ax
MOV ah, 3Ch
MOV cx, 0
MOV dx, offset rez
; AH -> 3CH, CREATE A FILE WITH HANDLE.
; CX -> Attribute for file:
; Bit0: read-only.
; Bit1: hidden.
; Bit2: system.
; Bit3: volume-label.
; Bit4: directory.
; Bit5: archive.
; Bit6: UNKNOWN.
; Bit7: shareable.
; DS:DX -> ASCIZ file-name (with optional drive and path).
; OUTPUT -> FCarry=1: ERROR, AX= error-code;
; FCarry=0: SUCCESSFULL, AX= file-handle.
INT 21h ; Results file is created and opened.
JB openfailed ; If error, exit.
;MOV handle, ax ; Not needed.
;MOV cx, 5 ; 5 bytes ("Hello")
;ADD cx, 10 ; 10 bytes from "(letters " and ")"
MOV bx, ax ; Copy file-handle into BX's reg.
CALL Write
MOV ah, 3Eh
;MOV bx, handle ; BX's reg. already contains handle.
; AH -> 3EH, CLOSE A FILE WITH HANDLE.
; BX -> File-handle
; OUTPUT -> FCarry=1: ERROR, AX= error-code;
; FCarry=0: SUCCESSFULL.
INT 21h ; Close file
openfailed:
MOV ah, 4Ch
MOV al, 0
; AH -> 4CH, QUIT WITH EXIT CODE (EXIT).
; AL -> EXIT CODE.
INT 21h
Write:
; I suppose that you want to write the content of the buffer (Buf),
; followed by brackets1 and brackets2 strings.
; NOTE: Buf CONTAINS ONLY CHARACTERS WITHOUT A PURPOSE !
;PUSH dx ; Because DX's reg. is only used here, don't need to PUSH/POP it
MOV ah, 40h
MOV cx, BufSize ; Size of Buf
MOV dx, offset Buf
; AH -> 40H, WRITE TO FILE WITH HANDLE
; BX -> Handle
; CX -> Buffer's size
; DS:DX -> Buffer
; OUTPUT -> FCarry=1: ERROR, AX= error-code;
; FCarry=0: SUCCESSFULL, AX= num. of byte written.
INT 21h ; Write to file
JB error ; If error, return
MOV ah, 40h
MOV cx, 10 ; Size of brackets1's string
MOV dx, offset brackets1
; AH -> 40H, WRITE TO FILE WITH HANDLE
; BX -> Handle
; CX -> Buffer's size
; DS:DX -> Buffer
; OUTPUT -> FCarry=1: ERROR, AX= error-code;
; FCarry=0: SUCCESSFULL, AX= num. of byte written.
INT 21h
JB error ; If error, return
MOV ah, 40h
MOV cx, 2 ; Size of brackets2's string
MOV dx, offset brackets2
; AH -> 40H, WRITE TO FILE WITH HANDLE
; BX -> Handle
; CX -> Buffer's size
; DS:DX -> Buffer
; OUTPUT -> FCarry=1: ERROR, AX= error-code;
; FCarry=0: SUCCESSFULL, AX= num. of byte written.
INT 21h
error:
;POP dx ; Because DX's reg. is only used here, don't need to PUSH/POP it
RET
END start