Print Page - get contents of a register?

Title: get contents of a register?
Post by: guntheria on March 03, 2014, 12:29:32 PM

Mega simple question, but very frustrating.

All I want to do is get the output the value of a register. I'm working in a WinAsm console program.

Main Proc
   XOR EAX,EAX
   Print_Text Msg ; set in .inc file, works
Print_Text CRLF ; new line

MOV EAX, 22 ; me goofing off

; All I want to do is output (or print) the value of EAX

   Get_Input Msg4,inbuf ;holds the console open
   RET
Main EndP

Title: Re: get contents of a register?
Post by: ragdog on March 03, 2014, 05:13:42 PM

invoke crt_printf, chr$(" Value:%d"), eax

http://msdn.microsoft.com/en-us/library/aa246400%28v=vs.60%29.aspx

Title: Re: get contents of a register?
Post by: jj2007 on March 03, 2014, 05:24:48 PM

Quote from: guntheria on March 03, 2014, 12:29:32 PM; All I want to do is output (or print) the value of EAX

I would use deb (http://www.webalice.it/jj2006/MasmBasicQuickReference.htm#Mb1019), but print str$(eax) works, too. It depends on the libraries you are using:
crt_printf requires msvcrt.inc
deb needs MasmBasic.inc (http://masm32.com/board/index.php?topic=94.0)
str$ needs masm32rt.inc

With crt_printf and str$ you need to preserve eax if you still need its value after displaying it.

Title: Re: get contents of a register?
Post by: guntheria on March 04, 2014, 11:56:19 AM

Thank you for your responses, but I've tried just about everything and keep getting errors. I am just starting to explore assembly and downloaded masm32 and WinAsm and created a Bare Bones Console app through the wizard. Assume I know nothing.

Here's what I've tried:

invoke crt_printf, chr$(" Value:%d"), eax

Errors:

C:\MASMx\MyConsole2\Console.Asm(33) : error A2006: undefined symbol : crt_printf

Then added msvcrt.inc and got give me the errors:

C:\MASMx\MyConsole2\Console.Asm(33) : error A2006: undefined symbol : chr$
C:\MASMx\MyConsole2\Console.Asm(33) : error A2114: INVOKE argument type mismatch : argument : 0

I looked at using deb, but when I clicked on the link, the information was over my head. (I just started Sunday)

So, I started to investigate using str$(), but when I include masm32rt.inc, I get more errors...

If I include masm32rt.inc I get:
------------------------------------------
WARNING Duplicate include file windows.inc
------------------------------------------
-----------------------------------------
WARNING Duplicate include file masm32.inc
-----------------------------------------
-------------------------------------------
WARNING duplicate include file kernel32.inc
-------------------------------------------
C:\MASMx\MyConsole2\Console.Asm(33) : error A2008: syntax error : offset
C:\MASMx\MyConsole2\Console.Asm(32) : error A2138: invalid data initializer

I clicked on the link, but the information was way over my head.

Here are the includes and libraries I'm using and used:

Include windows.inc
Include kernel32.inc
Include masm32.inc
;Include msvcrt.inc ; tried this
;Include masm32rt.inc ; tried this

IncludeLib kernel32.lib
IncludeLib masm32.lib

Title: Re: get contents of a register?
Post by: guntheria on March 04, 2014, 01:52:13 PM

I stumbled upon the MASM reference in the help files and now I'm off and running. Thanks!

The MASM Forum

Projects => Easy Code IDE 32/64-bit => Topic started by: guntheria on March 03, 2014, 12:29:32 PM