Using property of the remote application server

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4 total messages Started by Francesco Rossi Fri, 07 Dec 2001 18:12

#378

Author: Francesco Rossi
Date: Fri, 07 Dec 2001 18:12

20 lines
1575 bytes

Hi,
i 've make an application server using type library with c++builder 5.
I' ve make also a client application that use the properties of remote
application server. The client connect to the remote using the socket and
all work fine.
In a method FormCreate of client application i do this:

 IDispatch *disp = (IDispatch*)(ClientDataSetTransazioni->AppServer);
 IDMFastServerDisp ITemp( (IDMFastServer*)disp);
// Property of applicationserver
 if (!(bool)ITemp.IsDatabaseOpen) {
...
}

for check if the remote database is open, but when i close the application
this crash with a general protection error: it can't close some form,
because the IDE stop at line that destruct a form.

Is there anyone that tell me what is the problem ?
Thank.

Re: Using property of the remote application server

#379

Author: vavan
Date: Sat, 08 Dec 2001 10:52

24 lines
1839 bytes

On Fri, 7 Dec 2001 19:12:46 +0100, "Francesco Rossi" <inforsi@tin.it>
wrote:

>In a method FormCreate of client application i do this:
>
> IDispatch *disp = (IDispatch*)(ClientDataSetTransazioni->AppServer);
> IDMFastServerDisp ITemp( (IDMFastServer*)disp);
>// Property of applicationserver
> if (!(bool)ITemp.IsDatabaseOpen) {
>...
>}
>
>for check if the remote database is open, but when i close the application
>this crash with a general protection error: it can't close some form,
>because the IDE stop at line that destruct a form.

I suffer from similar very annoying problem that happens from time to
time. I tried to investigate and discovered an AV happens with Variant
variable when trying to invoke VarClear method somewhere inside VCL.
The most interesting is when I rebuild the project the problem is gone
till next time...

--
Vladimir Ulchenko aka vavan

R: Using property of the remote application server

#382

Author: Francesco Rossi
Date: Sun, 09 Dec 2001 22:12

23 lines
1678 bytes

Hi,
i found the solution for my problem. I hope this help you.
I must add the code:
ITemp->AddRef ();
for increment the reference of the server to the client object.
The code is:

IDispatch *disp = (IDispatch*)(ClientDataSetTransazioni->AppServer);
IDMFastServerDisp ITemp( (IDMFastServer*)disp);
ITemp->AddRef ();                        // <<<<<
// Property of applicationserver
if (!(bool)ITemp.IsDatabaseOpen) {

BYE
>
> I suffer from similar very annoying problem that happens from time to
> time. I tried to investigate and discovered an AV happens with Variant
> variable when trying to invoke VarClear method somewhere inside VCL.
> The most interesting is when I rebuild the project the problem is gone
> till next time...
>
> --
> Vladimir Ulchenko aka vavan

Re: Using property of the remote application server

#308

Author: vavan
Date: Wed, 26 Dec 2001 09:21

14 lines
1522 bytes

On Sat, 08 Dec 2001 13:52:21 +0300, vavan <vavan@santel.ru> wrote:

>I suffer from similar very annoying problem that happens from time to
>time. I tried to investigate and discovered an AV happens with Variant
>variable when trying to invoke VarClear method somewhere inside VCL.
>The most interesting is when I rebuild the project the problem is gone
>till next time...

Recently one good guy informed me that this is well known problem
related to unusability of builder's incremental linker and I switched
that option (don't generate state files) to off. Keep on testing...

--
Vladimir Ulchenko aka vavan

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