Call a VB COM object (STA: singlethreaded apartment). There are two asp 

pages. Inside 1.asp create an instance of the COM object MyObj1. Inside 

2.asp create an instance of the COM object MyObj2 too. Pop up two browsers 

at IE 5.0. Open 1.asp at browser1, then 2.asp at browser2. Since 2.asp was 

opened after 1.asp, the object MyObj2 inside 2.asp was created after the 

1.asp's MyObj1. The data of the MyObj1 got overwritten by MyObj2's.



Test the same thing in one VB project,there are two forms. Inside Form1 

create an instance of the COM object. Inside Form2 also crate an instance 

of the COM object. Since the instance of the COM object inside Form2 is 

created after the Form1's, the object inside the form2's overwrite the 

data of the object1 inside form1's data. 



object1 = server.createobject("BB.clsObject")  /** in 1.asp or form1 **/

object2 = server.createobject("BB.clsObject")  /** in 2.asp or form2 **/



Should this case happen when I call an instance of COM object (VB COM 

object, STA:singlethreaded apartment) ?



Thanks for your help !



licia

This is atypical behavior for a COM control, and the marshalling (apartment

or free threaded) has nothing inherently to do with sharing of data between

instances. The type of behavior you are witnessing describes what is

referred to as a COM Singleton, a special type of COM control specifically

written to share data between instances of itself. Writing singletons is

actually pretty hard to do properly so I'm curious if the control was

written poorly (improper use of global data). Anyway, a likely way to cheat

yourself out of this problem is to defeat the control's sharing behavior by

wrapping it in an MTX package. Still that's a hack, and examination of how

this control was written would be a good idea.







-----Original Message-----

From: licia liu [mailto:penglicia@y...]

Sent: Monday, November 05, 2001 11:01 AM

To: ASP components

Subject: [asp_components] Data Overwrite when call VB COM object (STA:

singlethreaded apartment)





Call a VB COM object (STA: singlethreaded apartment). There are two asp 

pages. Inside 1.asp create an instance of the COM object MyObj1. Inside 

2.asp create an instance of the COM object MyObj2 too. Pop up two browsers 

at IE 5.0. Open 1.asp at browser1, then 2.asp at browser2. Since 2.asp was 

opened after 1.asp, the object MyObj2 inside 2.asp was created after the 

1.asp's MyObj1. The data of the MyObj1 got overwritten by MyObj2's.



Test the same thing in one VB project,there are two forms. Inside Form1 

create an instance of the COM object. Inside Form2 also crate an instance 

of the COM object. Since the instance of the COM object inside Form2 is 

created after the Form1's, the object inside the form2's overwrite the 

data of the object1 inside form1's data. 



object1 = server.createobject("BB.clsObject")  /** in 1.asp or form1 **/

object2 = server.createobject("BB.clsObject")  /** in 2.asp or form2 **/



Should this case happen when I call an instance of COM object (VB COM 

object, STA:singlethreaded apartment) ?



Thanks for your help !



licia

 




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Hi !



It seems like some code error.

We had similar error in VC ATL component but it turns out that it was

some code problem.

Check this option and if you don't find anything

can you specify what data is overwritten like some variable or file(s).



Oleg





-----Original Message-----

From: licia liu [mailto:penglicia@y...]

Sent: November 05, 2001 6:01 PM

To: ASP components

Subject: [asp_components] Data Overwrite when call VB COM object (STA:

singlethreaded apartment)





Call a VB COM object (STA: singlethreaded apartment). There are two asp

pages. Inside 1.asp create an instance of the COM object MyObj1. Inside

2.asp create an instance of the COM object MyObj2 too. Pop up two browsers

at IE 5.0. Open 1.asp at browser1, then 2.asp at browser2. Since 2.asp was

opened after 1.asp, the object MyObj2 inside 2.asp was created after the

1.asp's MyObj1. The data of the MyObj1 got overwritten by MyObj2's.



Test the same thing in one VB project,there are two forms. Inside Form1

create an instance of the COM object. Inside Form2 also crate an instance

of the COM object. Since the instance of the COM object inside Form2 is

created after the Form1's, the object inside the form2's overwrite the

data of the object1 inside form1's data.



object1 = server.createobject("BB.clsObject")  /** in 1.asp or form1 **/

object2 = server.createobject("BB.clsObject")  /** in 2.asp or form2 **/



Should this case happen when I call an instance of COM object (VB COM

object, STA:singlethreaded apartment) ?



Thanks for your help !



licia





c-oleg.kapeljushnik@w...


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