MASM32, display string and integer

Question

I am using MASM32 (version 10), and I would like to know what is the easiest way to output a string and an integer on screen. Please provide the full source code, and not just the specific lines.

Thank you.

Edit:

.386 .model flat, stdcall .stack .data stest db "This is a test", 0 .code main proc mov ah, 09h lea dx, stest int 21h main endp end main

It crash without outputting anything. I tried several other things, with different problems, the only common thing is that I don't get the string displayed on screen :)

Are you stuck on something? Have you put any effort into this at all? — Greg Hewgill
– Greg Hewgill, Commented Dec 31, 2010 at 20:53
This isn't the place to have your homework done for you. Please post what you've tried already and indicate why it didn't work. — Ken White
– Ken White, Commented Dec 31, 2010 at 21:00

Greg Hewgill · Accepted Answer · 2010-12-31 21:28:23Z

You appear to be using DOS interrupts (int 21h) but have also used .model flat, which indicates you're not building a DOS program (DOS doesn't support the flat model).

If you intend to build a 32-bit console mode program suitable for running on Windows, you cannot use DOS interrupts. Here's an article which presents a 32-bit "hello world" Windows example using Win32 calls: 32-Bit Flat Memory Model MASM Code for Windows NT.

If you intend to build 16-bit DOS code, you probably want to start with the "small" memory model.

TBH, tried it in MASM32 (v10) and got loads of errors. I have a feeling it might compile with MASM 6.11, though am not interested. But thank you for clarifying the 16/32-bit thing for me, and for the effort finding that useful link.

Jester · Accepted Answer · 2011-01-01 00:27:29Z

Note that int21/09 requires the string to be terminated by a dollar sign ($). Also, even if your code did print something, it would crash immediately afterward since you don't terminate your program at all (see int21/4c) so it continues executing undefined memory. Depending on memory model and environment, you might also have to set up the segment registers and the stack for yourself first. All of this assumes that you indeed have access to int21 services to start with.

Finally, as a general advice, get a debugger working and trace your program.

Although no full source provided, it was really helpful. Thanks

Brian Knoblauch · Accepted Answer · 2011-02-10 21:07:32Z

Use the built-in "print" function/macro. It'll insert the appropriate call for you.

print "This is a test",13,10,0

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