ClientDataSet and multi-threading

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2 total messages Started by Florin Ciodaru Tue, 18 Sep 2001 12:01

#510

Author: Florin Ciodaru
Date: Tue, 18 Sep 2001 12:01

19 lines
1466 bytes

Hi,

I develop a multi-tier application wich use a simple MIDAS server to acces a
MSSQL 7 database.

On client side I use on a DataModule the following components : a
DCOMConnection and a ClientDataSet.


Evrithing work just fine in a single thread application.

When i move to a multi-thread application (in a child thread at runtime i
create a new instance of  DataModule) when i try to set the Active property
of ClientDataSet
i receive this EOleSysError error "CoInitialize has not been called".

How can i pass this error ?

Thanks in advance.

Re: ClientDataSet and multi-threading

#516

Author: Nobuya Higuchi
Date: Mon, 24 Sep 2001 00:41

35 lines
1927 bytes

Hello,

You need to initialize DCOM library in each thread. Try put
CoInitialize(0);
in each thread before you use Midas. You also need to put
CoUninitialize();
at the end of each thread.

Nobuya Higuchi

"Florin Ciodaru" <cflorin@syqon.com> wrote in message
news:3ba73780_2@dnews...
> Hi,
>
> I develop a multi-tier application wich use a simple MIDAS server to acces
a
> MSSQL 7 database.
>
> On client side I use on a DataModule the following components : a
> DCOMConnection and a ClientDataSet.
>
>
> Evrithing work just fine in a single thread application.
>
> When i move to a multi-thread application (in a child thread at runtime i
> create a new instance of  DataModule) when i try to set the Active
property
> of ClientDataSet
> i receive this EOleSysError error "CoInitialize has not been called".
>
> How can i pass this error ?
>
> Thanks in advance.
>
>

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