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flat assembler > Windows > Can't get a simple dll to assemble

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cdgoldin



Joined: 04 Sep 2019
Posts: 2
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.
Post 04 Sep 2019, 00:15
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 16737
Location: In your JS exploiting you and your system
You appear to be missing the .end.
Code:
format ...

;...

.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.
Post 04 Sep 2019, 00:19
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cdgoldin



Joined: 04 Sep 2019
Posts: 2
I looked at the example, but I didn't understand it. Sad
Besides, how would a missing .end statement cause fasmw to complain about an undefined MessageBeep?
Post 04 Sep 2019, 00:45
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 16737
Location: In your JS exploiting you and your system
.end is a macro defined by win32a?.inc. It will define all the import labels, which includes MessageBeep, for the import section.
Post 04 Sep 2019, 02:16
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guignol



Joined: 06 Dec 2008
Posts: 605
Location: /96A
Mjolnir needs no imports.
Post 04 Sep 2019, 07:54
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