VC ATL, DCOM - transferring data to a remote computer

DCOM - transferring data to a remote computer

Author	Message
Jeremy Pullicin #1 / 4	DCOM - transferring data to a remote computer Hi, I am fairly new to this stuff, and am just beginning to learn a bit about ATL, COM and DCOM. Currenly I have a class which has several member variables, some of which are ints, bools, strings and arrays. I would ultimately like to transfer this class to another computer using DCOM. What I want to know is this: Should I create a property or method for each member variable in my class? Or could I transfer my class as a liner buffer and cast it back to the class on the other computer? What is the best way to do this? I do not need to know implementation details as yet, I just need some direction. Any help, however small would be greatly appreciated. regards,
Sun, 01 Dec 2002 03:00:00 GMT

Girish Bharadwa #2 / 4	DCOM - transferring data to a remote computer You might want to either have a gigantic method which passes all the data in one shot or if you dont like that, you might attempt passing it via SAFEARRAY or a array of structs .. Quote: > Hi, > I am fairly new to this stuff, and am just beginning to learn a bit about > ATL, COM and DCOM. > Currenly I have a class which has several member variables, some of which > are ints, bools, strings and > arrays. > I would ultimately like to transfer this class to another computer using > DCOM. > What I want to know is this: > Should I create a property or method for each member variable in my class? > Or could I transfer my class > as a liner buffer and cast it back to the class on the other computer? What > is the best way to do this? > I do not need to know implementation details as yet, I just need some > direction. > Any help, however small would be greatly appreciated. > regards, -- Girish Bharadwaj
Sun, 01 Dec 2002 03:00:00 GMT

Dr Richard Grimes [MVP #3 / 4	DCOM - transferring data to a remote computer Quote: >Hi, >I am fairly new to this stuff, and am just beginning to learn a bit about >ATL, COM and DCOM. >Currenly I have a class which has several member variables, some of which >are ints, bools, strings and >arrays. >I would ultimately like to transfer this class to another computer using >DCOM. >What I want to know is this: >Should I create a property or method for each member variable in my class? Never do this, the reason is that to access each piece of data you will have to make a network call and this amount of calls will kill performance. Quote: >Or could I transfer my class >as a liner buffer and cast it back to the class on the other computer? What >is the best way to do this? If you want to use type library marshalling then you could use IRecordInfo to pass essentially a VB user designed type. Another option is to create an object with read/write propertie and marshal this object by value as a parameter to your method - ADO disconnected record sets and COM error objects are passed across the network in this way. (I would favour this method.) Just as a plug, MSDN Magazine will have an article in a couple of months time by me called "Data Transfer using COM on Windows 2000". I cover these issues there and give some recommendations about data packet sizes. Richard -- www.idevresource.com
Sun, 01 Dec 2002 03:00:00 GMT

Jeremy Pullicin #4 / 4	DCOM - transferring data to a remote computer Dr. Richard, I have succesfully managed to marshal my object by value. The technique seems to be working very well. Thanks for the advice, I look forward to reading the article on MSDN magazine. regards, Quote: > >Hi, > >I am fairly new to this stuff, and am just beginning to learn a bit about > >ATL, COM and DCOM. > >Currenly I have a class which has several member variables, some of which > >are ints, bools, strings and > >arrays. > >I would ultimately like to transfer this class to another computer using > >DCOM. > >What I want to know is this: > >Should I create a property or method for each member variable in my class? > Never do this, the reason is that to access each piece of data you will have > to make a network call and this amount of calls will kill performance. > >Or could I transfer my class > >as a liner buffer and cast it back to the class on the other computer? What > >is the best way to do this? > If you want to use type library marshalling then you could use IRecordInfo > to pass essentially a VB user designed type. Another option is to create an > object with read/write propertie and marshal this object by value as a > parameter to your method - ADO disconnected record sets and COM error > objects are passed across the network in this way. (I would favour this > method.) > Just as a plug, MSDN Magazine will have an article in a couple of months > time by me called "Data Transfer using COM on Windows 2000". I cover these > issues there and give some recommendations about data packet sizes. > Richard > -- > www.idevresource.com
Mon, 02 Dec 2002 03:00:00 GMT

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