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Jeff Douglass · Guest

In BCB 5 pro app that uses a paradox database file for storing application
events I am getting a "Name not unique in this contex" whenever I start the
app and I try to do the initalization stuff for this log file. This only
happens if my other BCB 5 pro app that acts as a database viewer/report
generator is running and has the same database file open. Any ideas what
could be the problem?

Thanks

Jeff

Jeff Douglass · Guest

More info. The error is happening at a call to session->AddStandardAlias().

Thanks

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"Jeff Douglass" <.> wrote

Jayme Jeffman Filho · Guest

Hi Jeff,

You may have been trying to add an existent alias to the opened Session.
This method shoud be used for create new database aliases, not to put them
in use. You should check if the alias name exists before call the
AddStandardAlias method.

From the Help file :
"Description

Call AddStandardAlias at runtime to create a session-specific BDE alias for
Paradox, dBASE or ASCII tables...."

HTH

Jayme.

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Jeff Douglass · Guest

Yes, I am using the call to create a temp alias for the session for what I
thought was only for the life of the app. However, what I found out was that
the app run fine if the other app that uses the BDE is not running. However,
if the other app is running, then the main app that is having the problem
will start up and run fine the first time but will fail in subsequent starts
untill I shutdow the other app.

From what I can figure out, I was getting the problem because when another
program that also uses the BDE was running, adding the alias in my app and
not deleting it the alias remained in the BDE memory so when I tried to run
the program again and tried to create the same alias, the alias was still in
the BDE memory eventhough the app that created the alias had terminated. I
fixed the problem by calling the DeleteAlias() function in the classes
destructor that handles the dbase stuff. Does this logic make sence to you?
Is there a better way to do this?

Thanks again.

Jeff

Jayme Jeffman Filho · Guest

Hi Jeff,

As the BDE aliases belongs to a single workstation you can delete them when
the application which has created it has finished, although you might have
another application running on the same machine that is using the same BDE
alias too.

Why don't you check if the BDE alias exist, if so connect to it, else create
the alias ?

You can also do not create any alias to configure your application, the
applications I've made using Paradox do not use any BDE alias, I just setup
the TDatabase::Directory.

HTH

Jayme.

"Jeff Douglass" <.> wrote