Mac for drector.

[Fred Step]

Jennifer Hall wrote:
Don't know if this is any good to you but the database will be listed if 
you do an lsof in the terminal. easy to do in Rb but I don't know if you 
can do this in director.

Fred

> Wow, thanks.
> If a data base is busy on a mac, will it always return an error when you try
> to read it???
> Jennifer
>
> -----Original Message-----
> From: valentina-bounces at lists.macserve.net
> [mailto:valentina-bounces at lists.macserve.net] On Behalf Of Ruslan Zasukhin
> Sent: Wednesday, August 09, 2006 2:32 AM
> To: valentina at lists.macserve.net
> Subject: Re: Mac for drector.
>
> On 8/9/06 4:09 AM, "Jennifer Hall" <jennifer at jennifershall.com> wrote:
>
> Hi Jennifer, 
>
>   
>> I'm using Valentina 1 for director on both the Mac and the PC.
>> In trying to detect if a database is busy I'm using the following code.
>>
>> ---------------------------------------
>>   --use actual valentina data base call to open
>>     openDatabase(pCurrentDataBase, dbpath, 4)
>>     err = ValentinaError()
>>     if (err <> 0 ) then
>>       -- error while open data base
>>       return err
>>     end if
>>     
>>     pRef = pCurrentDataBase.getRef()
>>     -- return negative number if error, else returns 0 if no error
>>     err = ValentinaError()
>>     if (err <> 0 ) then
>>       -- error while open data base
>>       return err
>>     end if
>>
>> sql = "select Name, PretestOn, PasswordOn, MasteryLevel, RecID from
>> Classes"
>>   pCursor = xtra("VCursor").new(pCurrentDataBase.getRef(), sql,2,3,2) --DC
>>   err = ValentinaError()
>>   if (err <> 0) then
>>     return []
>>   end if
>> --------------------------
>> I've set it up for the test so that I know a specific data base is busy.
>>     
> On
>   
>> the pc, the openDatabase call returns an error and you know it's busy.
>> However, on the mac, I don't get an error until the pCursor call.
>>
>> Any idea why and any suggestions to get the Mac to recognize an open
>> database.
>>     
>
> Mac OS X do not have exclusive mode of file open. This is why.
>
> Apple recommend resolve this creating near to file you open
> A tmp empty may be hidden disk file. So other app must check at first if
> this file present..
>
> Sounds like nightmare, but this is how linux work
>  
>
>