使字符串---以0結尾

Question

我無法使用此聲明，因爲selectedWords可以是任何字符串。

.DATA 
guessWords BYTE SIZEOF selectedWords DUP ('-'), 0 

所以我嘗試這樣做：

;Wordls what we select by rundom code 
selectedWords BYTE ? 
lengthSelectedWorld DWORD ? 

;Letter what we guess, input from keyboard 
guessLetter BYTE ? 
guessWords BYTE ? 
;Letter what are unknows, change with - 
letterUnknown BYTE "-", 0 

而且我寫這個功能

make_array1 PROC  

    mov edx,OFFSET selectedWords 
    call StrLength 
    mov lengthSelectedWorld,eax 
    mov lengthSelectedWorld1 ,eax 
    inc lengthSelectedWorld 

    loop_add_more: 
     cmp lengthSelectedWorld, 1 
     je done 
     dec lengthSelectedWorld  
     mov eax, '-' 
     mov ecx, lengthSelectedWorld1 
     mov edi, offset guessWords 
     rep stosw 

     mov edx, offset guessWords 
     call WriteString 
     call Crlf ;stampamo enter novi red 

     jmp loop_add_more  

    done: 
     mov eax, '0' 
     mov ecx, lengthSelectedWorld1 
     mov edi, offset guessWords 
     rep stosw 

     mov edx, offset guessWords 
     call WriteString 
     call Crlf ;stampamo enter novi red 

     ret 

make_array1 ENDP 

但這funcion後，我得到guessWords什麼是字符串----- - 並且沒有0和。那麼如何讓字串guessWords = ------- 0？

它非常重要，我對字符串的，因爲在代碼中的一些其他比較學結束0 ..

Answer 1

selectedWords BYTE ?儲量只有我一個selectedWords字節。與guessWords BYTE ?相同的問題。不要使用動態分配的內存作爲新手。在任何情況下預留足夠的空間：guessWords BYTE 50 DUP (?)。問號表示MASM可以決定將其視爲未初始化的內存（不存儲在.exe文件中，但在程序啓動時分配）。

STOSW存儲WORD（=兩個字符）。但Irvine的StrLength返回字符串的字節數。改爲使用STOSB。在STOSB之後，EDI指向最後存儲的AL之後的字符。您可以在那裏存儲空值。如果你想看到它，暫時將0改爲'0'。

INCLUDE Irvine32.inc 

.DATA 

;Wordls what we select by rundom code 
selectedWords BYTE "WEIGHTLIFTING", 0 
lengthSelectedWord DWORD ? 

;Letter what we guess, input from keyboard 
guessLetter BYTE ? 
guessWords BYTE 50 DUP (?) 

;Letter what are unknows, change with - 
letterUnknown BYTE "-", 0 

.CODE 

make_array1 PROC 

    mov edx,OFFSET selectedWords 
    call StrLength      ; Irvine32: Length of a null-terminated string pointed to by EDX 
    mov lengthSelectedWord,eax 

    loop_add_more: 
     mov al, '-'      ; Default charcter for guessWords 
     mov ecx, lengthSelectedWord  ; REP counter 
     mov edi, offset guessWords  ; Destination 
     rep stosb      ; Build guessWords 
     mov BYTE PTR [edi], 0   ; Store the null termination 

     mov edx, offset guessWords 
     call WriteString    ; Irvine32: write a string pointed to by EDX 
     call Crlf      ; Irvine32: new line 

     ret 

make_array1 ENDP 

main PROC 

    call make_array1 
    exit        ; Irvine32: ExitProcess 

main ENDP 

END main