Subject Re: EXTERN issue
From Gene Moore <chrtsi@aol.com>
Date Sat, 28 Nov 2015 14:40:09 -0500
Newsgroups dbase.getting-started

Gene Moore Wrote:

> Rich... Wrote:
 >
> > Try without the CDECL and the DO
 > > extern cint dBinput() cga.dll
 > > ? dBinput()
 > >
> > The name of the function has to be *exactly* the same as it is in the DLL
> > including capitalization. I suspect the name of the function is wrong or not
> > capitalized properly.
 > > If that doesn't help more information would be nice like maybe where this
> > dll came from, what it supposed to do and maybe a snippet of code from that
> > C++ program that can access this dll successfully.
 > > Rich...
 > >
> > "Gene Moore"  wrote in message news:O1ViijJKRHA.3560@ip-AC1E04A7...
 > >
> > I have this in a .prg file:
 > >
> > extern CDECL cint dBinput() cga.dll
 > > do dBinput()
 > >
> > I get "procedure not found dBinput"
 > >
> > It works fine when called from a C++ program. I've read the help and seem to
> > be doing it right. (Yes, cga.dll is in the same folder.) What am I missing?
> > I also tried it as:
 > >
> >
> > extern cint dBinput() cga.dll
 > > do dBinput()
 > >
> > and got the same result..
 > > Thanks,
 > > Gene Moore
> >
> I have tried load dll cga.dll with no difference.
 >
> Here's the actual routine (C++):
 >
> int dBinput()
 > {
 >         CDbinputDlg dlgdbinput;
 >         dlgdbinput.DoModal();
 >         return(0);
 > }
 >
> Here's where I think the problem is:
 >
> #define DllExport   __declspec( dllexport )
 >
> DllExport int dBinput();
 >
> This may not be the proper way to do it for .prg files.
 >
> My C++ programs use this convention and here's what a successful call looked like:
 >
> #define DllImport   __declspec( dllimport )
 >
> DllImport int dBinput();
 >
> dBinput();
 >
> The program is linked with the cga.lib file created when cga.dll was built.
Problem circumvented (not solved). I was trying to come up with a generic replacement for the @, Say sequence to get some input to the program. I've done that, and will be happy to share the technique with anyone who's interested.