Re: Re[2]: From classical 4gl to Dynamic 4gl
On Thu, 27 Aug 1998 Ramesh.Ramamurthy@alltel.com wrote: > The two things that come to my mind is ANSI C and redesigning the > screens. The Eval copy that we gat from informix contained only ANSI > C compatible Header files. That is certainly a documented restriction. With the production copy, you generally get a copy of GCC which is (obviously) ANSI C aware. I'm not sure about the demo version. > We have to redesign the screen due to the reason that the charecter > based screens to not take advantage of all the features that an gui > can give you. One limitation that I found was a big anoyance is that > the screen size is limited to 80X24 Hmm... There's an undocumented function (or, at least, there's a function for which I haven't found any documentation), which helps here: MAIN ... --# CALL fgl_setsize(rows, cols) --# CALL fgl_init4js() ... END MAIN I found an example of its use in some sample code I was looking at. Note that it is invoked before you call the initialization routine! I haven't checked what happens if you call it elsewhere. > I hope informix does something about this. The reason why this > software has this limitation is because of backward compatibility to > CHARECTER based. I consider this an invalid argument since the whole > reason why somebody buys this software is GUI. > D4GL is a very deciplined software. It will not cut any slack for bad > programming practice. This is in a way good because 4GL is so > forgiving that your software has too many memory leaks. Certainly, if you have sloppy I4GL code, especially with regard to the number of arguments to and return values from called functions, you will quickly find out about your mistakes. This was always true of I4GL-RDS; it is generally true of D4GL. One other item to beware of is that with a 6.00 or later ESQL/C, the cursor names are global rather than local to a single source file. This can cause chaos if you reuse cursor names indiscriminately. > ________________________ Reply Separator > Subject: RE: From classical 4gl to Dynamic 4gl > Author: "Sadagopan; Sathish" <sadagop0458@att.com> at internet > Date: 8/26/98 2:54 PM > > Hi Ramesh, > Any pointers when migrating 4GL applications to D4GL ? > TIA > Sathish Sadagopan > > > ---------- > > From: Ramesh.Ramamurthy@alltel.com > > Sent: Wednesday, August 26, 1998 10:15 AM > > To: Sujit.Pal@alltel.com; informix-list@iiug.org; akormancik@intec.sk > > Subject: Re: From classical 4gl to Dynamic 4gl > > > > I just completed compile and doing a demo of D4GL to the big guys in > > my company. Our product has the same description as your product. > > The conversion was not, in my experience, much of a problem it is > > just a routine grunt work and is only on the C side of the product. > > For the code that we had the output is very good. We didn't have > > much trouble, there was trouble here and there and other than that > > it went pretty smooth. Don't have too much expectation because you > > will have all the limitations that 4GL imposes in D4GL, like your > > window can only be 80*24. In order to come over this problem I > > decided just to redesign the screens which is lot more easier than > > moving to some other language and building this product from ground > > up. We are actually going to build new screens for a customer with > > this product and see there reaction since they are the people who > > are going to pay for it. > > > > Ramesh > > > > PS: There are a few gotcha's in the compilers. Always this ANSI and > > it will help. For more information feel free to send me a mail. > > > > ______________________________ Reply Separator ______________________________ > > Subject: From classical 4gl to Dynamic 4gl > > Author: Sujit Pal at ATNEDEN1 > > Date: 8/26/98 8:18 AM > > > > Ramesh > > > > You want to take this? If you do, reply to Anton's email below and to > > informix-list@iiug.org > > > > Sujit > > > > ________________________ Forward Header > > Subject: From classical 4gl to Dynamic 4gl > > Author: Anton Kormancik <akormancik@intec.sk> at internet > > Date: 8/26/98 10:59 AM > > > > We work and develop under 4gl for 6 years. Now I am very interested > > in Dynamic 4gl but haven't seen that and have no experience with it > > yet. Did anybody of you recompile his 4gl programs to Dynamic 4gl? > > If yes, then let me please know what were your biggest problems at > > changing from terminal applicatians to windows applications? It > > seems very hopeful but I very would like to know about possible > > problems. Yours, Jonathan Leffler (jleffler@informix.com) #include <witticism.h> Guardian of DBD::Informix v0.60 -- http://www.perl.com/CPAN Informix IDN for D4GL & Linux -- http://www.informix.com/idn