We are writing a big database application with Sybase SQL Anywhere and
till last week Delphi 1.0.

Last wednesday I got Delphi 2.0 Client/Server and now we have the
problem, that programs compiled with Delphi 2.0 don't run under Win
3.11.

Our program must run under different OS, such as Win 3.11, 95, NT,
OS/2. I can manage a Delphi 2.0 program to run under Win 3.11 when the
newest version of Win 32S is also installed on that machine.

But a simple program which uses the BDE under Win 3.11 doesn't run. I
can't manage to install the BDE under Win 3.11 / 32 S, so that my
programs work.

The biggest problem is, that the two Delphi Versions (2.0 and 1.02)
are !!!! NOT !!! compatible.

If I save the source in Delphi 2.0 and want to recompile it under
Delphi 1.02 for use under Win3.11/32S I get many errors because of
some new features !!!!
(TSession, ...... )

Does anybody have any help for me ??

Thanks

Thomas Auer

D2 has never been specified for Win 3.11.

Write and test in Delphi 1 -- it is far more upward compatible than
backward compatible (in my experience so far).

Set up separate directories for the binaries, and set up separate project
files:

MyApp
  myapp.dpr
  myapp32.dpr
  \win32
    [all myapp32 dcu's and exe's and res will go here]
  \win16
    [all myapp16 dcu's and exe's and res will go here]
  \src
    main.dpr

Set the respective projects (in the Directories options page) to output to
the win32 or win16 directory. Put the win32 and win16 directories (as
applicable) first in the search path, followed by the src directory.

This will go a long way to acheiving compatibility. I set up a couple of
test projects like this, and it works reasonably well. You will have to
play with this a bit to get it working.

You can use conditional directives to isolate version specific code:

{$IF WIN32}
  { put Delphi 2/Win32 specific code in here }
{$ELSE}
  { put Delphi 1 /Windows specific code in here }
{$ENDIF}

Note that the old style strings are supposed to work the same in Delphi 2,
but I haven't tried this yet. Porting Delphi 2 string code back to Delphi 1
usually fails though, especially if you are calling API routines and such.

I should add as a P.S., that I am not endorsing the idea of dual platform
development, just explaining a way to deal with it, if you think it will
work.

--
Brad Aisa <ba...@hookup.net>  web: http://www.hookup.net/~baisa/

1 Mises (M1.00) = 0.01 troy ounce gold; 1 Rand (1R) = 0.01 Mises

"The highest responsibility of philosophers is to serve as the
guardians and integrators of human knowledge."   -- Ayn Rand

[sorry, a couple of mistakes]

Write and test in Delphi 1 -- it is far more upward compatible than
Delphi 2 is backward compatible (in my experience so far).

{$IFDEF WIN32}

        Well excuse the expression, but DUH!

        Develop under 1.02.  PS, I don't believe TSession is new to 2.0.

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