I'm just write a simple program forced format print integer from BYTE. But it work not correct.
Here is my code:
ExitProcess PROTO : DWORD
printf PROTO C :VARARG ; The secret sauce.. a prototype of printf
.data
format DB "%d", 13, 10, 0
sum DWORD ?
.code
main PROC
LOCAL something : BYTE
mov al, 1
mov BYTE ptr [something], al
add BYTE ptr [something], 65
lea eax, BYTE ptr[something]
push eax
lea eax, format
push eax
call printf
xor eax, eax
push eax
call ExitProcess
main ENDP
END main
- I was debug and saw variable named "something", its value is correct.
include \masm32\include\masm32rt.inc
.data
HelloW$ db "Hello World", 13, 10, 0
.code
start:
printf(addr HelloW$) ; option A: the printf macro
invoke crt_printf, addr HelloW$ ; option B: invoke crt_somefunction
exit
end start
(and read the forum rules regarding black hat stuff...)
Well, I know how to print "Hello world", but when I move to kind print number, it got the error.
include \masm32\include\masm32rt.inc
.data
HelloW$ db "Hello World #%i", 13, 10, 0
TheNumber dd 42
.code
start:
printf(addr HelloW$, 42) ; option A: the printf macro
invoke crt_printf, addr HelloW$, TheNumber ; option A: invoke crt_somefunction
exit
end start
"when I move to kind print number" is google translate, I suppose?
use format DB "%p", 13, 10, 0when printing a local variable address.
or for valuemovzx eax, BYTE ptr[something]
I'm trying to print value of this address, not the addess of variable.
Quote from: BlackHat on June 22, 2017, 07:28:36 PM
I'm just write a simple program forced format print integer from BYTE. But it work not correct.
Here is my code:
ExitProcess PROTO : DWORD
printf PROTO C :VARARG ; The secret sauce.. a prototype of printf
.data
format DB "%d", 13, 10, 0
sum DWORD ?
.code
main PROC
LOCAL something : BYTE
mov al, 1
mov BYTE ptr [something], al
add BYTE ptr [something], 65
lea eax, BYTE ptr[something]
push eax
lea eax, format
push eax
call printf
xor eax, eax
push eax
call ExitProcess
main ENDP
END main
- I was debug and saw variable named "something", its value is correct.
For a start and even if you can't explain the error you get, probably because your English is too short for that, at least clean the stack when returning from a cdecl call.
Hello,
Here is a similar version :
.386
.model flat,stdcall
option casemap:none
include \masm32\include\windows.inc
include \masm32\include\kernel32.inc
include \masm32\include\user32.inc
printf PROTO C :DWORD,:VARARG
includelib \masm32\lib\kernel32.lib
includelib \masm32\lib\user32.lib
includelib \masm32\lib\msvcrt.lib
.data
format db 'Address = %X , Value = %d',13,10,0
.code
start:
call main
invoke ExitProcess,0
main PROC
LOCAL x:DWORD
lea edx,x
mov DWORD PTR [edx],0
mov al,1
mov BYTE PTR [edx],al
add BYTE PTR [edx],65
push DWORD PTR [edx]
push edx
push OFFSET format
call printf
add esp,3*4
ret
main ENDP
END start
If you don't need a wide range number to print, here is another example, to print it by hand. Another example (https://forum.nasm.us/index.php?action=dlattach;topic=1103.0;attach=90) that I did some years ago in nasm for dos that prints 65535*2 signed numbers in 2.56 seconds inside DosBOX
I tried and finally find my ERROR is push the address of variable and print it. Thanks guy very much.
How can I close this topic?
You don't have to close it, it remains for reference for any other member to read.
So, have something like Solved?
You can modify first post, and edit the topic, adding [solved].
Hi BlackHat,
You don't need to modify or add anything. The thread can stay as it is.