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Delphi and COM - how to release objects

Posted on 2003-12-04
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Last Modified: 2010-04-05
Hi all,

my method generates an exception on "end;". I believe I'm not releasing/free-ing the ojbects in a correct way.

  myConnection : ADODB_TLB.Connection;
  loginName : WideString;
  cmdCommand : ADODB_TLB.Command;
  oleParam, oleRecords : OleVariant;
  paramLogin : Parameter;
  Stream         : ADODB_TLB.TStream;
  resultString : WideString;

begin
   myConnection :=  m_ConnectionPool.getADOXMLConnection();
   cmdCommand := ADODB_TLB.CoCommand.Create();
   cmdCommand.Set_ActiveConnection( myConnection );
   paramLogin := cmdCommand.CreateParameter('@login',
                  adVarChar, adParamInput, 30, loginName );
   Stream := ADODB_TLB.TStream.Create(nil);
    Stream.Open(EmptyParam,adModeUnknown,
      adOpenStreamUnspecified,'','');
   cmdCommand.Properties.Item['Output Stream'].Value := Stream.DefaultInterface;
   cmdCommand.Execute( oleRecords, EmptyParam, adExecuteStream );
   resultString := Stream.ReadText(Integer(adReadAll));
   outXML.XMLfromString( resultString );
   Stream.Close;
  Stream.Free;
  cmdCommand._Release;
  myConnection._Release;
  m_ConnectionPool.returnConnection();

At the end, I need to close the stream, release the command object and release the connection and tell the pool that I'm not using the connection anymore.

In what order should I release the objects?

cheers,

henrik
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Question by:henrikatwork
1 Comment
 
LVL 22

Accepted Solution

by:
Mohammed Nasman earned 1500 total points
ID: 9873817
assign your interfaces to Nil

cmdCommand := nil;

in general Delphi will release the memory of the com object when it's go out of scope, or you can do that be assigning the nil to the interface, I think you don't need to call release method, Delphi will call it
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