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| lavanyaj |
 Posted: Fri Feb 17, 2006 7:47 am Post subject: Publish Subscribe in Visual Basic |
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Newbie
Joined: 17 Feb 2006
Posts: 4
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Hi,
I am new to MQ . I want to know if there are ways to do an Publish/ Subscribe in Visual Basic. I want to do a subscriber application in Visual Basic. I would like to know if there are any APIs available for this
Thanks |
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| jefflowrey |
| Posted: Fri Feb 17, 2006 7:55 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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If you search here for "XMS", you'll find comments about the support for .NET that it has or shortly will have.
Other than XMS, you have to hand-build an MQRFH2 header, I think.
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| jefflowrey |
| Posted: Fri Feb 17, 2006 7:57 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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Let me clarify a bit.
You need to be able to build an MQRFH2 header if you want to publish messages.
If you wish to receive subscriptions, you only really need to know how to IGNORE an MQRFH2.
If you want your program to register a subscription, then you need to build an MQRFH2. But there are tools (like the rfhutil in support pack IH03) that will let you register subscriptions manually.
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| lavanyaj |
| Posted: Fri Feb 17, 2006 8:56 am Post subject: Re: Publish Subscribe in Visual Basic |
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Newbie
Joined: 17 Feb 2006
Posts: 4
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| lavanyaj wrote: |
Hi,
I am new to MQ . I want to know if there are ways to do an Publish/ Subscribe in Visual Basic. I want to do a subscriber application in Visual Basic. I would like to know if there are any APIs available for this
Thanks |
Thanks Jeff, basically i want to write a visual basic client that subscribes, Multiple copies of the client can be run and Each instance of the client has to subscribe
I see that there are some samples for c++. Basically I want to know if we have any samples for Visual Basic or do i need to manually connect to the queue and get the messages
Thanks again |
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| jefflowrey |
| Posted: Fri Feb 17, 2006 9:05 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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You always need to manually connect and get messages.
Well, if you're using .NET, there is support for an MDB style thing with the .NET Monitor.
You can read about all this stuff in the Using .NET manual.
Subscriptions in general are based on queues, not applications. If you decide to give every instance of the applications it's own queue, then you will need to build either a static subscription for each instance or have the instance register itself. If you're going to have more than about 10 clients, I would highly recommend using Temporary Dynamic Queues instead of real queues. This is accomplished by having your application open up a MODEL queue, getting back the name of the TDQ and then registering the subscription for that name.
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| lavanyaj |
| Posted: Fri Feb 17, 2006 9:19 am Post subject: |
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Newbie
Joined: 17 Feb 2006
Posts: 4
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| Thanks Jeff, I am using Visual Basic and not .NET , I found a bas file cmqpsb.bas under the samples. which seems to have some constants for Publish Subscribe method. I will check if I can use this to build a subscriber application |
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| lavanyaj |
| Posted: Mon Feb 20, 2006 7:33 am Post subject: |
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Newbie
Joined: 17 Feb 2006
Posts: 4
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I need further help. I figured i could subscribe using the constants cmqpsb.bas file,
But now I need to periodically connect and do an MQGET to get the messages ( in a timer) Please let me know if this is allright ( since I am using Visual Basic) |
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| PieterV |
| Posted: Thu Apr 06, 2006 3:45 am Post subject: |
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Disciple
Joined: 04 Jan 2006
Posts: 164
Location: Belgium
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I am also looking for something like this, if it's possible in .NET (but not necessary).
I would need a client that connects (subscriber) and gets the messages for a particular topic...
any help is welcome |
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| jefflowrey |
| Posted: Thu Apr 06, 2006 4:19 am Post subject: |
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Grand Poobah
Joined: 16 Oct 2002
Posts: 19981
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A subscriber application is just another MQ application. There's no difference between getting messages from point-to-point and getting messages from pub/sub!
If the subscriber itself needs to register it's own subscription, then it's just another MQ application that can produce messages that have an MQRFH2 header on them.
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| mvic |
| Posted: Thu Apr 06, 2006 5:07 am Post subject: |
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Jedi
Joined: 09 Mar 2004
Posts: 2080
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| PieterV wrote: |
I am also looking for something like this, if it's possible in .NET (but not necessary).
I would need a client that connects (subscriber) and gets the messages for a particular topic... |
Have you seen the XMS client for .NET? The page is at http://www.ibm.com/support/docview.wss?rs=171&uid=swg24011756
If you want to discuss more, perhaps start a new thread? |
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| PieterV |
| Posted: Thu Apr 06, 2006 5:15 am Post subject: |
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Disciple
Joined: 04 Jan 2006
Posts: 164
Location: Belgium
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thanks, i'll have a look at this |
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