OpenEuphoria

Re: Accessing EHLLAPI DLL files

• Posted by pete_stoner at btconnect.com Sep 11, 2003
• 603 views

Hi Jonas,
            Kind of, I'm trying to wrap the emulator functions for the IBM
Personnal Communications so I can get and send data from/to a 3270 session,
but
it will be slow work as I am a novice to DLLs and C functions, so I might be
back here for more advice...

regards Pete


----- Original Message ----- 
From: "Jonas Temple" <jtemple at yhti.net>
To: "EUforum" <EUforum at topica.com>
Subject: RE: Accessing EHLLAPI DLL files


>
>
> Pete,
>
> I'm assuming that you're working with the emulator interface functions
> in Client Access from IBM.  If so, if you get a working Euphoria wrapper
> for this I would be interested in a copy, if it's okay.
>
> I've wrapped about 90% of the other CA DLLs and wanted to try EHLLAPI
> but never got around to it.
>
> Thanks,
>
> Jonas Temple
>
> P.S. - If you're interested in any of the other CA functions you can
> find my wrappers at www.yhti.net/~jktemple
> pete_stoner at btconnect.com wrote:
> >
> >
> > Hi All,
> >     I need some help on this, I have some questions on using functions
from
> > DLL files..
> >     I'm trying to reproduce a sample Visual Basic program (I don't know
VB!)
> > in Euphoria (EHLLAPI DLL stuff). The program needs to use a specific
> > (win32)
> > DLL file (which I'm also trying for the first time), with Euphoria I've
> > successfully called and executed a function in another DLL file (which
> > was a
> > major step forward for me!!) where I could see the function I am calling
> > in
> > the DLL (Using Dependency Walker). However I have a problem (or 2) with
> > the
> > DLL I really need to use.
> >
> >     An excerpt from the reference manual..
> > >The EHLLAPI entry point (hllapi) is always called with the following
> > >four
> > parameters:
> > >1.EHLLAPI Function Number (input)
> > >2. Data Buffer (input/output)
> > >3. Buffer Length (input/output)
> > >4. Position (input); Return Code (output)
> >  >   The prototype for the EHLLAPI is; (long hllapi(LPINT, LPSTR, LPINT,
> > LPINT)"
> > > Each parameter is passed by reference not by value...... (etc etc)
> >
> > My first problem is that I always get an error (-1) from my
> > define_c_function . The function I am calling is not listed in the DLL I
> > have to call, I am assuming that it must be in another DLLs that the
> > first
> > one links to (?), also the book says I have to call the function by
> > number
> > (I still don't fully understand if I am defining it correctly) i.e.
> > ehlapi = open_dll("EHLAPI32.DLL")
> > ConnectPS = define_c_func(ehlapi, "1", {C_INT, C_POINTER, C_INT}, C_INT)
> >
> > The ref book goes on to say..
> > >All the parameters in the hllapi call are pointers and the return code
> > >of
> > the EHLLAPI function is returned in the value of the 4th parameter, not
> > as
> > the value of the function..
> > Which would suggest that I cannot get the return code with just the
> > normal
> > ret = c_func(ConnectPS....
> >
> >     Hopefully I've explained this enough (it's tricky when you don't
really
> > know what you are talking about!!)...Help!!
> > .
> >
> >
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