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digitalmars.D.learn - DLL Linking

reply vermi <moi_anti_spam_ vermi.fr> writes:
Hi, i'm trying to build a dll with our favorite langage, but I have a little
problem. For now it's juste an "empty dll" (with just DllMain).
I think the better is to show you the shell ouput :

dmd.exe -O -w  -IC:\dmd\src\phobos  -IK:\Projects\D\V4D -c main.d
-ofobj\Release\main.obj

dmd.exe -ofbin\Release\V4D.dll  obj\Release\main.obj  phobos.lib  
link obj\Release\main,bin\Release\V4D.dll,,phobos.lib+user32+kernel32/noi;
OPTLINK (R) for Win32  Release 7.50B1
Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved
   
OPTLINK : Warning 23: No Stack 
obj\Release\main.obj(main) 
 Error 42: Symbol Undefined __acrtused_dll
OPTLINK : Warning 134: No Start Address 


I have looked on the site and have found a page (don't remember the url)
telling to remove de -NL switch, add a .def file, ... But it's visibly not my
problem :/.

Can anyone help me ?
Jun 19 2007
parent reply vermi <moi_anti_spam_ vermi.fr> writes:
So strange, I have added a void main() {} And now it's seem to work !
I have a DllMain and a main... o
DllMain is executed when the dll is loaded.

An Explaination ?



vermi Wrote:

 Hi, i'm trying to build a dll with our favorite langage, but I have a little
problem. For now it's juste an "empty dll" (with just DllMain).
 I think the better is to show you the shell ouput :
 
 dmd.exe -O -w  -IC:\dmd\src\phobos  -IK:\Projects\D\V4D -c main.d
-ofobj\Release\main.obj
 
 dmd.exe -ofbin\Release\V4D.dll  obj\Release\main.obj  phobos.lib  
 link obj\Release\main,bin\Release\V4D.dll,,phobos.lib+user32+kernel32/noi;
 OPTLINK (R) for Win32  Release 7.50B1
 Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved
    
 OPTLINK : Warning 23: No Stack 
 obj\Release\main.obj(main) 
  Error 42: Symbol Undefined __acrtused_dll
 OPTLINK : Warning 134: No Start Address 
 
 
 I have looked on the site and have found a page (don't remember the url)
telling to remove de -NL switch, add a .def file, ... But it's visibly not my
problem :/.
 
 Can anyone help me ?

Jun 19 2007
parent reply Extrawurst <spam extrawurst.org> writes:
did you take a look at the DLL sample shiped with the dmd compiler ?


vermi schrieb:
 So strange, I have added a void main() {} And now it's seem to work !
 I have a DllMain and a main... o
 DllMain is executed when the dll is loaded.
 
 An Explaination ?
 
 
 
 vermi Wrote:
 
 Hi, i'm trying to build a dll with our favorite langage, but I have a little
problem. For now it's juste an "empty dll" (with just DllMain).
 I think the better is to show you the shell ouput :

 dmd.exe -O -w  -IC:\dmd\src\phobos  -IK:\Projects\D\V4D -c main.d
-ofobj\Release\main.obj

 dmd.exe -ofbin\Release\V4D.dll  obj\Release\main.obj  phobos.lib  
 link obj\Release\main,bin\Release\V4D.dll,,phobos.lib+user32+kernel32/noi;
 OPTLINK (R) for Win32  Release 7.50B1
 Copyright (C) Digital Mars 1989 - 2001  All Rights Reserved
    
 OPTLINK : Warning 23: No Stack 
 obj\Release\main.obj(main) 
  Error 42: Symbol Undefined __acrtused_dll
 OPTLINK : Warning 134: No Start Address 


 I have looked on the site and have found a page (don't remember the url)
telling to remove de -NL switch, add a .def file, ... But it's visibly not my
problem :/.

 Can anyone help me ?


Jun 19 2007
parent reply vermi <moi_anti_spam_ vermi.fr> writes:
If you want the source code of my dll, it's so simple :

//// CODE BEGIN

import std.c.windows.windows;

HINSTANCE hInst;

extern (Windows) BOOL DllMain(HINSTANCE hInstance, ULONG ulReason, LPVOID
pvReserved)
{
    switch (ulReason)
    {
        case DLL_PROCESS_ATTACH:
	    break;

        case DLL_PROCESS_DETACH:
	    break;

        case DLL_THREAD_ATTACH:
	    return false;

        case DLL_THREAD_DETACH:
	    return false;

	    default:
    }

    hInst = hInstance;
    return true;
}

// La fonction main() ne sert strictement a rien a part a faire fonctionner la
compilation
void main() { }


//// END OF CODE


The void main() { } allow me to link the dll, if I don't put it, the linker
tell me the message I wrote before.

This code is copy/past from samples on the digitalmars website.
Jun 19 2007
parent reply Hoenir <mrmocool gmx.de> writes:
You need to create a .def file and pass it to dmd.
Jun 19 2007
parent vermi <moi_anti_spam_ vermi.fr> writes:
I have onen, here it is :

LIBRARY		V4D
EXETYPE		NT
SUBSYSTEM	WINDOWS
CODE		PRELOAD SHARED EXECUTE DISCARDABLE
DATA		PRELOAD SINGLE WRITE


It appears on the command line :
dmd.exe -ofbin\Release\V4D.dll V4D.def obj\Release\main.obj  phobos.lib
( this is the executed command line )
dmd.exe call then :
link obj\Release\main,bin\Release\V4D.dll,,phobos.lib+user32+kernel32,V4D.def/noi;

Has you can see, the .def file appears in both command lines.
Jun 19 2007