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Article View: borland.public.cppbuilder.database.multi-tier
Article #83

Re: datasnap access violation

#83
From: billaras1234
Date: Fri, 01 Apr 2005 10:34
40 lines
2966 bytes
if i have understood correctly you mean to create a separate function inside
the remore data module to activate ore not the compnents inside it (like ado
tables..) and to call this function from another form..i have done this and
i still get a access violation in memory...i dont understand what is going
on..once the rdm starts nothing cant change it?
i believe that there must be a way or it might be a borland bug
� "Mark Guerrieri" <mguerrieri@nospam_cmsgrp.com> ������ ��� ������
news:424c78d6$1@newsgroups.borland.com...
> > i have used datasnap remote data module to create a multi tier database
> > application...
> > i have placed in the remote data module an ado connection ,4 ado tables
> and
> > 4 dataset providers..i
> > have also (of course a form1)..i want to when i click the start/shutdown
> > button on the Form1 to stop or start the datasnap server...when i try to
> > stop the adoconnection (with connected->false,or cancel()) i get an
access
> > violation,same for the tables(adotable->active=false) the same for the
> > dataset providers..it seems that i cant change  anything in the remote
> data
> > module by using a button on the form1...of course i have included the
file
> > header(<include...)...what am i doing wrong?
> > the funny thing is that if i put an adoconnection in my form and use a
> > button to start stop it ,it works perfectly!
> >
>
> By design, the DataSnap server should be running on one machine (with no
> user interface) and the client that accesses it should be running on
another
> machine.  At the least, they would be running in seperate prcesses on the
> same machine.  Either way, there is no way to directly access the
> properties/methods of the components on the RDM from the client app.  Your
> access violations are most likely the result of accessingg NULL/undefined
> pointers, since the form in the client has no access to the components in
> the RDM.
>
> Mark
>
>
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Subject: Re: datasnap access violation
Date: Fri, 1 Apr 2005 13:34:17 +0300
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