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Kathleen Beaumont
Guest
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 Posted: Mon Feb 02, 2004 1:06 am Post subject: Upgrading custom component from BCB3 to BCB6 |
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I have a set of components that were developed for a project in BCB3,
which I would like to load into the palette for BCB6.
I do not have experience writing components. Can somebody point me to
help files/white papers/old newsgroup postings that may help me get
these installed into BCB6?
FWIW, these were installed into BCB3 using Component | Install Component
and not Install Package.
Symptoms and side effects:
When I open my BCB6 DCLUSR.bpk and attempt to Install Component with one
of the .PAS files, the compiler issues errors such as:
Code:
if Value and FDataLink.DataSourceFixed then
DatabaseError(SDataSourceFixed);
Error:
(Pascal Error) Undeclared identifier: 'SDataSourceFixed'
Code:
FKeyValue := Null;
Error:
(Pascal Error) Undeclared identifier: 'Null'
Thanks for your help.
Kathleen Beaumont
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OBones
Guest
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| Posted: Mon Feb 02, 2004 2:18 am Post subject: Re: Upgrading custom component from BCB3 to BCB6 |
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Kathleen Beaumont wrote:
| Quote: | I do not have experience writing components. Can somebody point me to
help files/white papers/old newsgroup postings that may help me get
these installed into BCB6?
FWIW, these were installed into BCB3 using Component | Install Component
and not Install Package.
You should create a package for your components, installing them in |
DCLUSR isn't a good idea as it is not easy to transport them.
| Quote: | Symptoms and side effects:
When I open my BCB6 DCLUSR.bpk and attempt to Install Component with one
of the .PAS files, the compiler issues errors such as:
Code:
if Value and FDataLink.DataSourceFixed then
DatabaseError(SDataSourceFixed);
Error:
(Pascal Error) Undeclared identifier: 'SDataSourceFixed'
Well, start looking for where SDataSourceFixed is |
| Quote: | Code:
FKeyValue := Null;
Error:
(Pascal Error) Undeclared identifier: 'Null'
Well, AFAIK, Null never existed in Pascal for the purpose of pointers. |
You must use nil.
To me it seems your code doesn't even compile for a start. That's quite
surprising.
But as usual, I may be wrong...
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Remy Lebeau (TeamB)
Guest
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| Posted: Mon Feb 02, 2004 4:48 am Post subject: Re: Upgrading custom component from BCB3 to BCB6 |
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"Kathleen Beaumont" <kathleen (AT) catalinasystems (DOT) com> wrote
| Quote: | I have a set of components that were developed for a project
in BCB3, which I would like to load into the palette for BCB6.
|
Whatever steps you took in BCB3 to install the component still apply in BCB6
as well. You cannot use the existing BCB3 package(s), you need to recompile
the component source code into a new BCB6-generated package first.
Depending on the actual component source code, you may or may not have to
re-write the code itself as well, to account for the many differences in the
VCL and compiler between the versions.
| Quote: | (Pascal Error) Undeclared identifier: 'SDataSourceFixed'
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You need to add "VDBConsts" to your 'uses' clause.
| Quote: | (Pascal Error) Undeclared identifier: 'Null'
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The Null variable was moved from the "System" unit to the "Variants" unit,
so you need to add "Variants" to your 'uses' clause.
Gambit
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Remy Lebeau (TeamB)
Guest
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| Posted: Mon Feb 02, 2004 4:50 am Post subject: Re: Upgrading custom component from BCB3 to BCB6 |
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"OBones" <obones_fff_ (AT) meloo_fdf_ (DOT) com> wrote
| Quote: | Well, AFAIK, Null never existed in Pascal
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Yes, it did. It was a global Variant variable that was declared in the
System unit. Now it has been moved into the Variants unit instead, and
changed into a function instead of a variable.
Gambit
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OBones
Guest
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| Posted: Mon Feb 02, 2004 11:28 pm Post subject: Re: Upgrading custom component from BCB3 to BCB6 |
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Remy Lebeau (TeamB) wrote:
| Quote: | "OBones" <obones_fff_ (AT) meloo_fdf_ (DOT) com> wrote in message
news:401db355$1 (AT) newsgroups (DOT) borland.com...
Well, AFAIK, Null never existed in Pascal
Yes, it did. It was a global Variant variable that was declared in the
System unit. Now it has been moved into the Variants unit instead, and
changed into a function instead of a variable.
Oh ok. |
I stand corrected then.
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Craig Farrell
Guest
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| Posted: Mon Feb 02, 2004 11:30 pm Post subject: Re: Upgrading custom component from BCB3 to BCB6 |
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Hi,
I suggest creating a new component and package to use
as a guide. For example, if your BCB3 component derived
from TDBComboBox, then in BCB6, do Component | New Component
and derive TMyBCB6DBComboBox from TDBComboBox and install it
into a new package. Then use that generated code and package
project as a guide for things like the 'Requires' list, and where
in the source, you will need to make manual additions to the BCB3
code, e.g. you will have to add...
#pragma package(smart_init)
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