473,395 Members | 2,010 Online
Bytes | Software Development & Data Engineering Community
Post Job

Home Posts Topics Members FAQ

Join Bytes to post your question to a community of 473,395 software developers and data experts.

How do I compare 2 objects which reference COM objects?

Uzi
Hi,
I have 2 references to COM objects (through interop). How do I compare
the tow to know if they are pointing to the same COM object?
The Object.Equals doesn't work in this case...
Thanks!
Uzi

Jan 5 '06 #1
2 2032
You should be able to QueryInterface for IUnknown and compare the pointers.

--
Colin Neller
http://www.colinneller.com/blog
"Uzi" <ha*****@yahoo.com> wrote in message
news:11**********************@o13g2000cwo.googlegr oups.com...
Hi,
I have 2 references to COM objects (through interop). How do I compare
the tow to know if they are pointing to the same COM object?
The Object.Equals doesn't work in this case...
Thanks!
Uzi

Jan 5 '06 #2

"Uzi" <ha*****@yahoo.com> wrote in message
news:11**********************@o13g2000cwo.googlegr oups.com...
Hi,
I have 2 references to COM objects (through interop). How do I compare
the tow to know if they are pointing to the same COM object?
The Object.Equals doesn't work in this case...
Thanks!
Uzi


IntPtr IUnkn1 = Marshal.GetIUnknownForObject(o1);
IntPtr IUnkn2 = Marshal.GetIUnknownForObject(o2);
if (IUnkn1 == IUnkn2)
// same object
else
....
Willy.
Jan 5 '06 #3

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

12
by: Helmut Jarausch | last post by:
Hi, what does Python do if two objects aren't comparable (to my opinion) If I've understood "Python in a Nutschell" correctly it should raise an exception but it doesn't do for me. Here are...
8
by: laniik | last post by:
Hi. I have a problem using STL's built in sort that seems impossible to get around. if i have: -------------------------------- struct object { int val; }
8
by: Kenneth Baltrinic | last post by:
I am trying to compare values coming out of a database record with known default values. The defaults are in an array of type object (because they can be of any basic data type, I am not working...
19
by: David zhu | last post by:
I've got different result when comparing two strings using "==" and string.Compare(). The two strings seems to have same value "1202002" in the quick watch, and both have the same length 7 which I...
14
by: Samuel R. Neff | last post by:
Why would you cast two strings to objects to compare them? I saw code in an MS sample on MSDN and don't get it. if ( (object)name == (object)attr.name ) { both "name" and "attr.name" are...
2
by: Locia | last post by:
How can I compare "if argument"? example: if (leftExpression==RightExpression) After parsing I know the type of RightExpression. I suppone that if RightExpression is wrap into " " is a...
7
by: Prabhudhas Peter | last post by:
I have two object instances of a same class... and i assigned values in both object instances (or the values can be taken from databse and assigned to the members of the objects)... Now i want to...
50
by: titan nyquist | last post by:
I wish to compare two structs via == but it does not compile. I can overload and create my own == but am I missing something that c# already has implemented? ~titan
6
by: Tony | last post by:
Hello! Below I have a complete working program.with some simple classes one of these is a generic class. Now If I want to implement functionallity so I can compare animal with each other or...
0
by: ryjfgjl | last post by:
In our work, we often receive Excel tables with data in the same format. If we want to analyze these data, it can be difficult to analyze them because the data is spread across multiple Excel files...
0
BarryA
by: BarryA | last post by:
What are the essential steps and strategies outlined in the Data Structures and Algorithms (DSA) roadmap for aspiring data scientists? How can individuals effectively utilize this roadmap to progress...
1
by: nemocccc | last post by:
hello, everyone, I want to develop a software for my android phone for daily needs, any suggestions?
0
by: Hystou | last post by:
There are some requirements for setting up RAID: 1. The motherboard and BIOS support RAID configuration. 2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...
0
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can...
0
Oralloy
by: Oralloy | last post by:
Hello folks, I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>". The problem is that using the GNU compilers,...
0
jinu1996
by: jinu1996 | last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven...
0
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows...
0
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.