A simple example: Message Boxes

[art_sands]

Hi there,

Downloading and installing FASM
1. Download FASM for Windows Console and for Windows GUI from http://www.flatassembler.net.
2. First unzip console version into C:\fasm folder.
3. Then unzip GUI version into C:\fasm folder
4. Open all the files in a Multitab editor (e.g. TextPad) and replace in all text (.asm, .inc) files (in the fasm folder) the word "%include%" with "%fasminc%", otherwise egs may not work.

You should have this directory structure:

C:\fasm\
- INCLUDE
- SOURCE
- EXAMPLES

5. Before you start fiddling with the examples or my example, set this "fasminc" environment variable (specifies where the header files will be found):

For Windows 9x at this to autoexec.bat:
set fasminc=C:\fasm\include

(without the ending seperators ';' or '\' )

For Windows 2000/XP set this environment variables dialog:
a. Create new variable named "fasminc"
b. Add this path "C:\fasm\include", without the ending seperators ';' or '\', to this variable.


A bludy simple example
You're now ready to compile and run programs. We will use only the console version of the assembler. Put this into a plain-text file named "showmsg.asm".

A point to be noted is that this is an extremely simple program and there are macros hiding the background stuff that goes on, so this is only a starting point.

Remember Case is sensitive.

INCLUDE "%fasminc%\win32ax.inc"

.data

    MsgCaption      DB "Hello",0
    MsgBoxText      DB "win32asm is cool",0
    
.code            ; case-sensitive not equal to .CODE or .Code

WIN_START:

    invoke  MessageBox, NULL, MsgBoxText, MsgCaption, MB_OK
    invoke  MessageBox, NULL, "Hello, World!", "M$ Windoze", MB_OK + MB_ICONEXCLAMATION
    invoke  ExitProcess, 0

.end WIN_START

Compile this using the following command at the command prompt.

fasm showmsg.asm showmsg.exe

More comin later (only if requested).

Regards,
Art