Thread: DEF files?

how do you create them? i read somewhere that you need them in dlls sometimes


//edit
i am using msv6

//edit 2

i have this in my DLL header

Code:

#ifndef DLLCODE_H
#define DLLCODE_H
#include "windows.h"


extern "C" LRESULT __declspec(dllexport)  CALLBACK  __stdcall  Proc(int,WPARAM,LPARAM);

#endif

in MSDN it says DEF files arent needed if you use __declspec

in my DLL cpp file i use the function:

Code:

LRESULT  __stdcall CALLBACK  Proc(int code,WPARAM wParam,LPARAM lParam)

still i cant load the function from my EXE file

Cant try your code, but put the extern "C" in front of the declaration and definition

Like so

Code:

#define DllExport extern "C" __declspec (dllexport) 
 
DllExport CALLBACK  Proc(int code,WPARAM wParam,LPARAM lParam)

Ok so go to FILE -> New -> FILE

It should bring up a list of options for you to select from. Select Def file.

In the def file start with

LIBRARY <add name of your dll file here> (no < or >)

Then at the next line write EXPORTS

Then list all the functions you wish to export.

Here is an example:

Code:

LIBRARY myDll
EXPORTS
              myFunction1
              myFunction2

Thats it, happy coding!

Allright, select text file, that is essentially all a definition file is. Don't forget to name the extension .def.

should i create the function prototypes there only

Only the function NAMES

or the final function, do i put this in the exe folder?

This file is created in the same workspace / folder of your dll source file. It is used as linker input not for the final product.

should i change anything in the dll now?

No, you shouldn't have to change anything with the dll.

ok i've been up all night + morning thinking about the problem and i think i've tried everything, and still i cant get it to work
ill post the code, maybe someone knows about this problem.

note: some changes have been done from previous posts.

the dll.h

Code:

#ifndef DLLKOD_H
#define DLLKOD_H
#define DllExport extern "C" __declspec (dllexport) 
#include "windows.h"


HHOOK hok;

extern "C" LRESULT CALLBACK Proc(int,WPARAM,LPARAM);

#endif

the dll.cpp

Code:

#include "dllkod.h"


LRESULT CALLBACK __stdcall Proc(int code,WPARAM wParam,LPARAM lParam)
{
  return CallNextHookEx(hok,code,wParam,lParam);
}

the program cpp shorted down for you

Code:

#include <iostream.h>
#include <windows.h>

int main()
{
     
	 static HINSTANCE hi;
	 HOOKPROC hProc;	
     hi = LoadLibrary("podedll.dll");
    
	if(hi==0)

    cout<<"could not load dll";

    hProc=(HOOKPROC)GetProcAddress(hi,"_Proc@12");
	

    if(hProc==0)
    cout<<"could not load hook function";
	 
	return 0;
}

and the def file

Code:

LIBRARY "podedll.dll"
EXPORTS           
        Proc

if the def looks like that without the "_" before and "@12" after
i get the error

Code:

pode.def : error LNK2001: unresolved external symbol Proc
Debug/mainprog.lib : fatal error LNK1120: 1 unresolved externals
LINK : fatal error LNK1141: failure during build of exports file
Error executing link.exe.

mainprog.exe - 3 error(s), 0 warning(s)

else i get

Code:

mainprog.exp : warning LNK4070: /OUT:podedll.dll directive in .EXP differs from output filename "Debug/mainprog.exe"; ignoring directive
Debug/mainprog.exe : warning LNK4086: entrypoint "_mainCRTStartup" is not __stdcall with 12 bytes of arguments; image may not run
mainprog.exp : error LNK2001: unresolved external symbol _Proc@12
Debug/mainprog.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

mainprog.exe - 2 error(s), 2 warning(s)

thx!

//edit
maybe i havent linked it properly!?

LIBRARY "podedll.dll"
EXPORTS
Proc

Should be

Code:

LIBRARY podedll
EXPORTS           
        Proc

Here is an application that works(the def file is the txt file. you will need to rename it with an extension .def for it to work) It uses a dll function to cause the program to beep:

Originally Posted by bithub

I'm confused, are you getting these errors when compiling the exe or the dll? You do realize that the .def file is for the dll and not the exe, right?

aaha!

so i would add the def file to the DLL project rather than the main program project?

thx bithub for pointing that out
i that fixed the problem heh

and thanks everyone else for their help!

azteched, thats a great way of doing things if you have a way to access both the client and server. However most of the cases you do not have access to both, usually only one or the other.