blabberer

Sometimes Google in its infinite wisdom will never get you what you remember you saw earlier in the same Google come what may or use whatever search term you may imagine

so i was searching for this simple dll tutorial which i vividly remember and i couldn't find it

and hence this blog

so you want to create a dll and you want to do it in command line
not using start->program->vs->new->project->name->win32->console->crap>dll>bs->whatever->magic->finish->stdafx.h->pch->build f7->search the whole comp for dll

ok here is how you do it

make a new directory somewhere the dir i created is named NOFIXED

add these files to the directory

Code:

NOFIXED:\>cd NOFIXED

NOFIXED:\>dir /b
AddNumbers.bat
AddNumbers.c
AddNumbers.def
AddNumbers.h
CallAddNum.c
NOFIXED:\>

AddNumbers.c is the source code for dll and it contains

Code:

NOFIXED:\>type AddNumbers.c
#include <windows.h>
#include "AddNumbers.h"


BOOL WINAPI DllMain(
    HINSTANCE hinstDLL,
    DWORD fdwReason,
    LPVOID lpReserved ){
                switch( fdwReason ){
                        case DLL_PROCESS_ATTACH:
                                break;
                        case DLL_THREAD_ATTACH:
                                break;
                        case DLL_THREAD_DETACH:
                                break;
                        case DLL_PROCESS_DETACH:
                                break;
                }
                return TRUE;
}


_declspec (dllexport) ULONG AddNumbers(ULONG a, ULONG b){
    return((ULONG)(a+b));
}

NOFIXED:\>

AddNumbers.h is the Header File You Would Need To Link To The Dll when You Create An EXE and it contains

Code:

NOFIXED:\>type AddNumbers.h
#include <windows.h>
BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason,LPVOID lpReserved );
_declspec (dllexport) ULONG  AddNumbers(ULONG a, ULONG b);

NOFIXED:\>

AddNumbers.def is the module definition File that is required to Build a Dll and it contains

Code:

NOFIXED:\>type AddNumbers.def
EXPORTS
AddNumbers
NOFIXED:\>

CallAddNum.c is the source code for the exe that links to the AddNumbers.dll that you are going to Build and Call the function in the dll and it contains

Code:

NOFIXED:\> type CallAddNum.c
#include <stdio.h>
#include "AddNumbers.h"

int main (void){

        printf("3 + 5 = %x\n" , AddNumbers(3,5));
        return 0;
}
NOFIXED:\>

and finally AddNumbers.Bat contains the command line to build the exe and dll

and it contains the following commands
cl is the compiler
/nologo suppresses copyright message
/c compiles only no linking
/LD tells the compiler to create a dll and not an exe
link is the linker
/dll tells the linker to link the compiled obj code into a dll
def:"AddNumbers.def" is the module def file which creates AddNumbers.Lib And AddNumbers.Exp which you use when you compile any exe to link to the dll

Code:

NOFIXED:\>type AddNumbers.bat
cl  /nologo /c /LD AddNumbers.c
link /NOLOGO /dll /def:"AddNumbers.def" AddNumbers.obj
cl /nologo CallAddNum.c AddNumbers.lib
NOFIXED:\>

now open vs2008commandprompt

start -> program -> microsoft visual c++ 2008 Express Edition -> visual studio tools -> visual studio 2008 command prompt

navigate to the present NOFIXED Directory
and run the AddNumbers.bat you should get you dll and exe compiled

Code:

NOFIXED:\>dir /b & AddNumbers.bat & dir /b
AddNumbers.bat
AddNumbers.c
AddNumbers.def
AddNumbers.h
CallAddNum.c

NOFIXED:\>cl  /nologo /c /LD AddNumbers.c
AddNumbers.c

NOFIXED:\>link /NOLOGO /dll /def:"AddNumbers.def" AddNumbers.obj
   Creating library AddNumbers.lib and object AddNumbers.exp

NOFIXED:\>cl /nologo CallAddNum.c AddNumbers.lib

CallAddNum.c
AddNumbers.bat
AddNumbers.c
AddNumbers.def
AddNumbers.dll
AddNumbers.exp
AddNumbers.h
AddNumbers.lib
AddNumbers.obj
CallAddNum.c
CallAddNum.exe
CallAddNum.obj

NOFIXED:\>

run the exe to check if you have succeeded

Code:

NOFIXED:\>CallAddNum.exe
3 + 5 = 8

NOFIXED:\>

that is all for now