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General => The Campus => Topic started by: 5k3l3t0r on June 11, 2012, 04:15:53 AM

Title: Export function with variable number of args
Post by: 5k3l3t0r on June 11, 2012, 04:15:53 AM

hi all,

i have a static lib that export some functions, the problem comes wen i try to export a function that uses C calling convenction and  VARARG:



myFunction proto C :DWORD,:VARARG

.code
myFunction proc C param:DWORD,args:VARARG

ret
myFunction endp



the .def

LIBRARY myLibrary.lib
EXPORTS func1 @1 --------------->this work ok
               func2 @2 --------------->this work ok
               myFunction @3  ------> can't call this function


i must export that function in some diferent way?

bye

5k3l3t0r

PLEASE READ THE NO HELP DESK RULE. This is a forum of member, not a help desk. I have removed the [solved] from the title.

Title: Re: Export function with variable number of args
Post by: Tedd on June 11, 2012, 07:47:08 AM

C-style functions should have their exported names prefixed with underscore, try _myFunction ;)

Title: Re: Export function with variable number of args
Post by: 5k3l3t0r on June 11, 2012, 10:48:45 AM

hi Tedd

i have tried what you suggest and have build errors :

Code: [Select]

ReTool-2.0.def : error LNK2001: unresolved external symbol _RTCallModuleFunction
ReTool-2.0.def : error LNK2001: unresolved external symbol _RTLogMessageEx
ReTool-2.0.lib : fatal error LNK1120: 2 unresolved externals
LINK : fatal error LNK1141: failure during build of exports file

any other option?
tkx

5k3l3t0r

Title: Re: Export function with variable number of args
Post by: dedndave on June 11, 2012, 10:59:39 AM

you can see what the export names are by using something like dependency walker
or use one of Erol's tools - a number of ways to see what is exported by the lib

then - you will want a proper prototype
i suspect this is what may be missing

Title: Re: Export function with variable number of args
Post by: 5k3l3t0r on June 11, 2012, 11:22:38 AM

without the underscore the lib compile ok, but the i can't use the function in my exe that import that lib,
wen i try to compile the exe get
"error A2006: undefined symbol : RTLogMessageEx"
all other functions without the c style work ok

if i add the underscore to the def file, the lib wont compile...

this is the name in the export table:

http://screensnapr.com/v/tlAvi6.png

tkx
5k3l3t0r

Title: Re: Export function with variable number of args
Post by: dedndave on June 11, 2012, 11:36:37 AM

maybe you could make an example library and post the source
it would be easier than each of us writing a lib   :P