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Pablo
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 Posted: Wed Feb 18, 2004 9:58 pm Post subject: Version compatibility |
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Hi there, I have a code for Delphi 1 and I'd like to know if I can use
it in Delphi 7. What could be the problems (if there are some)?
Thanks.
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Duncan Murdoch
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| Posted: Wed Feb 18, 2004 10:13 pm Post subject: Re: Version compatibility |
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On 18 Feb 2004 13:58:34 -0800, [email]portiz (AT) hal (DOT) famaf.unc.edu.ar[/email] (Pablo)
wrote:
| Quote: | Hi there, I have a code for Delphi 1 and I'd like to know if I can use
it in Delphi 7. What could be the problems (if there are some)?
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D7 is very different from D1. You may have lots of trouble:
- D7 is a 32 bit compiler, D1 is a 16 bit compiler.
- The VCL has changed a lot.
- Compiled units are completely incompatible between versions.
On the other hand, if it's a simple program that doesn't do much, it
might just compile.
Duncan Murdoch
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J French
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| Posted: Thu Feb 19, 2004 10:08 am Post subject: Re: Version compatibility |
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On 18 Feb 2004 13:58:34 -0800, [email]portiz (AT) hal (DOT) famaf.unc.edu.ar[/email] (Pablo)
wrote:
| Quote: | Hi there, I have a code for Delphi 1 and I'd like to know if I can use
it in Delphi 7. What could be the problems (if there are some)?
Thanks.
|
In D1 an Integer was 16 bits - now it is 32 bits
In D1 Strings were 255 bytes long plus S[0] that contained their
length - now they are radically different
Record alignment is different
Any D1 components for which you do not have the source (or a D7
replacement) will just not work
Realistically you should make a copy of the project and try it
- first in one go (you might get lucky)
- and if that fails, build the project from the bottom up
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Catherine Rees Lay
Guest
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| Posted: Fri Feb 20, 2004 10:53 am Post subject: Re: Version compatibility |
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In article <403489e0.162561141 (AT) news (DOT) btclick.com>, J French
<erewhon (AT) nowhere (DOT) com> writes
| Quote: | On 18 Feb 2004 13:58:34 -0800, [email]portiz (AT) hal (DOT) famaf.unc.edu.ar[/email] (Pablo)
wrote:
Hi there, I have a code for Delphi 1 and I'd like to know if I can use
it in Delphi 7. What could be the problems (if there are some)?
Thanks.
In D1 an Integer was 16 bits - now it is 32 bits
In D1 Strings were 255 bytes long plus S[0] that contained their
length - now they are radically different
Record alignment is different
Any D1 components for which you do not have the source (or a D7
replacement) will just not work
Realistically you should make a copy of the project and try it
- first in one go (you might get lucky)
- and if that fails, build the project from the bottom up
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Agreed. Just to add, if the compiler howls because you made assumptions
about the structure of strings (setting the length with S[0] for
example) you can use ShortString for backward compatibility.
HTH,
Catherine.
--
Catherine Rees Lay
To email me, use my first name in front of the "at".
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