I would like to know how those win32 processes get the output from 32/16 bits console programs, just like fasm IDE does with fasm console compiler.

FASMW and Fresh both use tweaked version of FASM.

But to do this, you just need to redirect stdout to yourself.

thankyou vid,

but how can stdout point out 2 processes at the same time ? Was it defined in console program or fasm IDE ?

you must create "pipe" and run FASM from your process. not really sure how, look for some SetStdHandle and CreatePipe etc...

What would be really nice is if someone turned FASM into a dll that's callable from other languages.

I say someone because I'm not that good with assembler to do such a thing. This might be something I toy around with but it's probably not going to get anywhere.

Before FASMW there was an IDE for fasm called Assembly Workplace, which used external FASM through the pipe. However it seems I have lost its sources... Also internet archive doesn't have them... Too bad.

here function used in FASM Add-In for WinAsm Studio. you can update it for your purposes.