I need a dll to "beep" on various error conditions. I wrote a simple assembler language program to do this, and it worked --- as an .exe program. I can't get it to work as a dll. FASM is now complaining that MessageBeep is undefined! Here is my code:

; ringbell.asm DLL

format PE GUI 4.0 DLL
entry DllEntryPoint

include 'win32w.inc'

section '.code' code readable executable

proc DllEntryPoint hinstDLL,fdwReason,lpReserved

invoke MessageBeep,0xffffffff

ret ; Return to caller

endp

I tried including win32a, win32ax and win32w --- all with the same error.

You appear to be missing the .end. .end will construct the import section.

But for a DLL to load you will need an export section also. See the example DLL in the fasm download.

I looked at the example, but I didn't understand it.
Besides, how would a missing .end statement cause fasmw to complain about an undefined MessageBeep?

.end is a macro defined by win32a?.inc. It will define all the import labels, which includes MessageBeep, for the import section.

Mjolnir needs no imports.