Assembly language program

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December 7th, 2010, 01:54 PM

goonj

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Join Date: Nov 2010

Posts: 3

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Assembly - Assembly language program

Question:
Create two procedures: (1) SetColor receives two BYTE parameters: forecolor and backcolor. It calls the SetTextColor procedure from the Irvine32 library. (2) WriteColorChar receives three byte parameters: char, forecolor, and backcolor. It displays a single character, using the color attributes specified in forecolor and backcolor. It calls the SetColor procedure, and it also calls WriteChar from the Irvine32 library. Both SetColor and WriteColorChar must contain declared parameters. Complete the missing part of the code for the two procedures.

Code:

TITLE SetColor and WriteColorChar

INCLUDE Irvine32.inc

SetColor PROTO forecolor:BYTE, backcolor:BYTE
WriteColorChar PROTO char:BYTE,forecolor:BYTE, backcolor:BYTE

.data
.code
main PROC
INVOKE WriteColorChar, 'A', white, blue INVOKE WriteColorChar, 'B', blue, white INVOKE WriteColorChar, 'C', green, black INVOKE WriteColorChar, 'D', yellow, gray INVOKE SetColor, lightGray, black
call Crlf
exit main ENDP

WriteColorChar PROC ...
...
WriteColorChar ENDP

SetColor PROC ...
...
SetColor ENDP END main

Code:


TITLE SetColor and WriteColorChar

INCLUDE Irvine32.inc

SetColor PROTO forecolor:BYTE, backcolor:BYTE
WriteColorChar PROTO char:BYTE,forecolor:BYTE, backcolor:BYTE

.data
.code
main PROC
INVOKE WriteColorChar, 'A', white, blue 
INVOKE WriteColorChar, 'B', blue, white 
INVOKE WriteColorChar, 'C', green, black 
INVOKE WriteColorChar, 'D', yellow, gray 
INVOKE SetColor, lightGray, black

call Crlf
exit 
main ENDP


WriteColorChar PROC

         pop ebp                                                                        ; pop the ebp from the stack
        pop ecx                                                                        ; pop the ecx reg. from the stack
        pop ebx                                                                        ; pop the ebx reg. from the stack
        pop eax                                                                        ; pop the eax reg. from the stack

        push eax                                                                ; push Foreground onto the stack
        push ebx                                                                ; push background onto the stack
        push ecx                                                                ; push wChar onto the stack

        call SetColor                                                        ; call SetColor
        call WriteChar                                                        ; call WriteChar

        ret

WriteColorChar ENDP


SetColor PROC 
        push ebp                                                            ; Save calling procedure base pointer
        mov ebp, esp                                                        ; Set base pointer for this procedure

        mov ecx, [ebp + 16]                                                 ; Retrieve colors
        mov eax, [ebp + 12]                                                 ; from the stack

        mov ebx, 16                                                         ; foreColor + (backColor * 16 )
        mul ebx                                                                        
        add ecx, eax                                                        

        mov eax, ecx                                                        ; move ecx reg. into eax re.
        call SetTextColor                                                   ; call SetTextColor to set the fore and back colors

        mov eax, [ ebp + 8 ]                                                ; retreive the char from the stack
		pop ebp                                                             ; Restore base pointer for calling procedure

        ret

SetColor ENDP 
END main

I'm not familiar with INVOKE and PROTO directive, but I tried my best to make this program. I think I have not used the INVOKE function properly.
Error I get is A2111: Conflicting parameter definition

December 7th, 2010, 06:06 PM

OmegaZero

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Join Date: May 2007

Posts: 738

Time spent in forums: 3 Weeks 5 Days 6 h 52 sec
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Corresponding PROTO and PROC directives have to match. Your PROTOs list several arguments but your PROC directives don't. Either remove the arguments in PROTO and handle the arguments manually like you did in SetColor, or define the arguments in PROC matching the PROTO.

Seeing as your teacher left an ellipsis after the "PROC" you're probably supposed to fill them in.

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Assembly - Assembly language program

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