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shaolin007



Joined: 03 Sep 2004
Posts: 65
shaolin007
I'm making the jump from NASM to FASM since about everyone I know in assembly programming is saying it's alot better. I read the documentation for FASM and looked at some examples of Window API calls and my questions are this...

1. I use the 'invoke' 'directive?' to call an API function? Or instead of using that, do I need to tell FASM to use __stdcall and push my parameters onto the stack in reverse then call the function?

2. I use 'import' to import a library or dll?

3. I noticed that the examples have PE GUI, what exactly does this mean?

Sorry about all the questions but I have mainly been learning 16bit programming. Thanks in advance.
Post 23 May 2005, 12:53
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coconut



Joined: 02 Apr 2004
Posts: 326
Location: usa
coconut
1) invoke is a macro, that will create the standard call for you pushing the arguments in reverse

ie invoke display,hello,world
is
push world
push hello
call display

2) a dll yes, new versions of fasm allow you to just 'reference' the dll with import macro, only functions used will be referencedin your exe - see the examples in the fasm package for windows

3) this basically formats the source as a windows portable executable file, using gui interface instead of console/command line interface. you should use "format PE GUI 4.0" to have a modern gui in your apps instead of the old flat windows like win95 (win98 onwards is where the 4.0 comes from) if you dont specify any formatting, fasm will create a flat binary file
Post 23 May 2005, 15:32
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Tomasz Grysztar



Joined: 16 Jun 2003
Posts: 7801
Location: Kraków, Poland
Tomasz Grysztar
Quote:

like win95 (win98 onwards is where the 4.0 comes from)

Actually it was Win95 that was 4.0 - the earlier ones with flat (and white by default) window style were Windows 3.11 and NT up to 3.51.
Post 23 May 2005, 15:40
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coconut



Joined: 02 Apr 2004
Posts: 326
Location: usa
coconut
ah true, thanks for pointing that out
Post 23 May 2005, 21:08
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