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Problem Statement: How to know if unmanaged com object is deleted from memory.
Problem Description: I have unmanaged object instance in one class. When closing application this object is is destructed from other part of code. And it also comes to point where object is member of class to do some final clear stuff. When it tried to access this com object (which has already been deleted from memory) it throws memory access violation error.
Is there any way to know if this object still exist?
Thanks,
AksharRoop
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I hope I atleast know this!!
The object is not null. It holds a pointer to an object. so here it is a 'dangling ptr' kind of situation.
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Not so much "dangling pointer", but orphaned. The only way to see if it still exists is to check the pointer to it for null. If you're worried about orphaning pointers, make sure you're those pointers to other objects are null before you kill the parent object.
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Thanks Dave, I wrote a similar reply but just happened to see that there was another comment 
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Dear friend,
Do you know any freeware event calendar develop in .NET 1.1?? It just used to show the event in month (e.g. simple version of google calendar). No need for edit. Urgently needs.
Big Thanks,
Mimi
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Message Closed
modified 23-Nov-14 6:31am.
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It is not simple to change from 2.0 to 1.1. Any recommend?
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How to Display value of variable in crystal report textbox run time???
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You should use database to fatch data from forms.
If you can think then I Can.
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types a code ->select the database/dataset/datatable(This depends on your needs) to search you need->bind datagridview again.If you do not wish to refresh,you can use ajax.dll.
i am chinese,english is not my first language.so i can't speak in detail.Hope I express clearly
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thanks for your reply.
are you sure u did understand my message ?
it could be grateful if you could help me in code style, im creating a windows application.
so much of happy ending...
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when user types a code number in the code Column...... description and price is automatically displayed
let me see.yes ,i do not understand the message .
Two kinds of situations
1: add a new textbox to input the code ,when the textbox change,the information display in the datagridview.of course,you said you want search the datagridview,so the datagridview is be filled at firt.datagridview's datasource usuall is datatable .
you can write the code like this
DataTable dt = ds.Table[0];
DataView dv = dt.DefaultView;
dv.RowFilter = "ID = '"+textBox1.Text+"'";
dataGridView1.DataSource = dv;
2:I am a real jerk.I don't understand what you mean.If this is true.i am very sorry,but you could laugh whit me at my poor english.
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hi bro.
you really got my point and you did exactly what i asked for . thanks.
But just one thing i needed is that i dont want a textbox. instead i want search data by using datagridview column which is the first column.
thanks
...................
so much of happy ending...
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Hi
i've added some types to an external assembly as well, but it's original types overwritten. is there any way to add new types without overwrite it's original types ?
thanks in advance
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i was developing an application that filters out web pages to privent users from viewing certain webpages. how can i make sure the process does not exit. even from task manager. i used another process that checks weather the process is still running and if not it will restart the application again but it creates delay. does any one have any idea how to do that
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WATIF THE USER STOPS THE SERVICE. THE USER WILL HAVE ADMINISTRATIVE PRIVILAGE....
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Then you can't do much operating client-side. If the user is an Administrator he can do pretty much anything he want with his machine.
If you want to forbid access to some URLs, I suggest you look using a proxy server application (such as websense).
P.S.: don't shout.
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Well, preventing the privilegies of an admin ofdoesn't sound right.. Maybe you should move your URL-checking from the local machine? And please don't shout.. 
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You can create Application or Service which you should start at windows logon.
Service is the best way to use it. Service have the facility to start automatically.
If you can think then I Can.
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WATIF THE USER STOPS THE SERVICE. THE USER WILL HAVE ADMINISTRATIVE PRIVILAGE
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Xelalem wrote: WATIF THE USER STOPS THE SERVICE.
Always remember, it's the user's PC. Why should your software prevent him/her from being in control of their own computing platform.
txtspeak is the realm of 9 year old children, not developers. Christian Graus
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