Re: Call EXE from DLL (A crystal User defined DLL)

From:

AndersG <gustafsson.anders@gmail.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Fri, 09 Nov 2007 09:20:18 -0000

Message-ID:

<1194600018.458867.172150@50g2000hsm.googlegroups.com>

On 7 Nov, 19:20, Joseph M. Newcomer <newco...@flounder.com> wrote:

Another solution besides the callback is to pass an HWND and have your DLL SendMessage or
PostMessage to the HWND.

Yes, thought of that, but in the end I did this:

Main app does a LoadLibrary on the Crystal DLL and:

Kilroy = (Kilroy_type)GetProcAddress(hDLL, "Kilroy");
if(Kilroy)
    {
    (*Kilroy)(1,(FARPROC)&CLpKalender::crBeraknaSemesterdagar);
    (*Kilroy)(2,(FARPROC)&CLpKalender::crBeraknaArbetsdagar);
    }
}

Thus passing the addresses of the needed functions to the DLL, which
stores them globally:

// http://support.microsoft.com/kb/125677
//
#pragma comment(linker, "/SECTION:.shared,RWS")
#pragma data_seg( ".shared" )
FARPROC crBeraknaSemesterdagar = NULL;
FARPROC crBeraknaArbetsdagar = NULL;
#pragma data_seg()

Then the User-defined fn in the dll, just does a:

    if(crBeraknaSemesterdagar)
        ret = (crBeraknaSemesterdagar)(FirstParam->Parameter.ParamString,
                    SecondParam->Parameter.ParamString