Export from executable

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Nikolay Petrov

Joined: 22 Apr 2004
Posts: 101
Location: Bulgaria

Nikolay Petrov

Please help me Embarassed

How i export a functions from exe file?
thanks in advance

09 Jan 2005, 13:56

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid

just like in DLL, create export section/data like you would in DLL

11 Jan 2005, 08:27

Nikolay Petrov

Joined: 22 Apr 2004
Posts: 101
Location: Bulgaria

Nikolay Petrov

Thanks Vid for quick replay.
Before post i tried like that, but without success . May be i wrong somewhere.

simple exe with export section:

Code:

;newdll.exe
format PE GUI 4.0; DLL
include '%fasminc%\win32a.inc'
entry start
;Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«
section '.code' code readable writeable executable
start:
     call mess
     invoke ExitProcess,0

proc mess;,hinstDLL,fdwReason,lpvReserved
enter
  invoke MessageBox,0,ss1,ss2,0
  mov eax,1
return
endp

ss1 db "message",0
ss2 db "title",0

section '.import' import data readable writeable
  library kernel,"kernel32.dll",user,"user32.dll"
  import kernel,ExitProcess,"ExitProcess"
  import user,MessageBox,"MessageBoxA"


section '.export' export data readable

 export "newdll.exe",mess,"mess"

section '.reloc' fixups data discardable

And "invoke" prog.:

Code:

format PE GUI 4.0
include '%fasminc%\win32a.inc'
entry start
;Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«Â«
section '.code' code readable writeable executable
start:
   invoke mess
   invoke ExitProcess,0

section '.import' import data readable writeable

  library kernel32,"kernel32.dll",new,"newdll.dll";"newdll.exe"
  import kernel32,ExitProcess,'ExitProcess'
  import new,mess,"mess"

if i compile programe 1 like executable - programe 2 can't work. But when i compiled programe 1 like dll - programe 2 work.

11 Jan 2005, 14:19

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia

vid

hmm, i quess it has something to do with Dll init procedures (called each time app wants to use some DLL) it is pointed by entry point of file, so i quess that you are calling ExitProcess inside it, while as DLL entry proc it should return. But i am not sure, try it.

12 Jan 2005, 00:06

Vortex

Joined: 17 Jun 2003
Posts: 318

Vortex

Nickolay,

Why your executable should export functions? Why not to use a DLL?

_________________
Code it... That's all...

12 Jan 2005, 18:52

IronFelix

Joined: 09 Dec 2004
Posts: 141
Location: Russia, Murmansk region

IronFelix

Nikolay, i have done something like this: i exported some function from EXE and imported it in DLL, used by this EXE. I think it is useful when you want to export some pointer to datablock into DLL without extra coding (initialization functions, etc.) - this will be done by OS. But it works only on WinXP, on Win98 it fails. If you still need the example, i shall try to find it in my progs.

Regards.

14 Jan 2005, 09:08

Nikolay Petrov

Joined: 22 Apr 2004
Posts: 101
Location: Bulgaria

Nikolay Petrov

IronFelix it's will be an interesting. Smile

I tryed, but was retuned error: the application failed to initialize properly (0xc0000005)

14 Jan 2005, 21:59

JohnFound

Joined: 16 Jun 2003
Posts: 3499
Location: Bulgaria

JohnFound

I am not very sure, but it is possible that Win98 doen't relocate the .exe files even if there is a reloc section... So, maybe it is possible to import functions dynamically using LoadLibrary or possibly LoadLibraryEx with GetProcAddress. Maybe if the .exe is loaded with LoadLibrary the loader will provide relocations???
Another atempt may be GetProcAddress with hInstance of the .exe (if this exe running in the moment)...

Regards.

14 Jan 2005, 22:07

Nikolay Petrov

Joined: 22 Apr 2004
Posts: 101
Location: Bulgaria

Nikolay Petrov

John, i think that it doesn't matter if we import a function with LoadLibrary - GetProcAddress, or as import data, but maybe you right about the way. I collect some executable with working export functions and interesting for me is a loading 'dll' address - 00410000h, but it's entry point my exe...
At this moment i exported a working function from executable without using winapi or other dll functions. If i include it - result is a 'stack is overflow' or 'Access violation reading location...'. Confused

Maybe i must read more about 'reloc' section...

15 Jan 2005, 20:58

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