VB COM, VB-COM Threading Model

VB-COM Threading Model

Author	Message
keit #1 / 4	VB-COM Threading Model When desinging a ActiveX dll component, there are only two options for Threading Model (in Project Properties page), Apartment Threaded and Single Threaded. After compiling the component and installing it into COM+, I checked its Properties in Concurrency tab and it shows Single Thread Apartment at Threading Model no matter what Threading Model I selected when designing the component. Do it means that Apartement Threaded and Single Threaded are same for VB ActiveX dll? Thanks Keith
Mon, 14 Feb 2005 01:10:33 GMT

Joe #2 / 4	VB-COM Threading Model Quote: > When desinging a ActiveX dll component, there are only > two options for Threading Model (in Project Properties > page), Apartment Threaded and Single Threaded. > After compiling the component and installing it into > COM+, I checked its Properties in Concurrency tab and it > shows Single Thread Apartment at Threading Model no matter > what Threading Model I selected when designing the > component. > Do it means that Apartement Threaded and Single Threaded > are same for VB ActiveX dll? So, it only means that MTS/COM+ was written by sneering C bigots. If you want your components to be first class citizens in COM+, you have little choice but to use MSVC- and only MSVC-. -- Joe Foster <mailto:jlfoster%40znet.com> Sign the Check! <http://www.xenu.net/> WARNING: I cannot be held responsible for the above They're coming to because my cats have apparently learned to type. take me away, ha ha!
Mon, 14 Feb 2005 06:15:25 GMT

Slav #3 / 4	VB-COM Threading Model Hi Keith, "Single threaded" aka main threaded setting is a legacy setting which you should not use for COM+ components. It basically means that only the thread which created the instance can execute the code. With the "Apartment Treaded" setting under COM+ it is possible for other threads ( from the STA pool) to execute the code, but still, generally, the code could only be executed by one thread at a time. This is why the available COM+ concurrency settings are limited. Both threading settings are essentially different flavors of the same thing ( STA), and therefore COM+ explorer shows Single Thread Apartment at Threading Model no matter Threading Model you select in VB. You must always set your COM+ VB project to "Appartment Treaded", and check "Retain in memory". Slava Quote: >When desinging a ActiveX dll component, there are only >two options for Threading Model (in Project Properties >page), Apartment Threaded and Single Threaded. >After compiling the component and installing it into >COM+, I checked its Properties in Concurrency tab and it >shows Single Thread Apartment at Threading Model no matter >what Threading Model I selected when designing the >component. >Do it means that Apartement Threaded and Single Threaded >are same for VB ActiveX dll? >Thanks >Keith
Thu, 17 Feb 2005 19:44:27 GMT

keit #4 / 4	VB-COM Threading Model sounds to me it is better to design COM+ components by VC++ to achieve best performance. Thanks all of you advice. Quote: >-----Original Message----- >Hi Keith, >"Single threaded" aka main threaded setting is a legacy setting which >you should not use for COM+ components. It basically means that only >the thread which created the instance can execute the code. >With the "Apartment Treaded" setting under COM+ it is possible for >other threads ( from the STA pool) to execute the code, but still, >generally, the code could only be executed by one thread at a time. >This is why the available COM+ concurrency settings are limited. >Both threading settings are essentially different flavors of the same >thing ( STA), and therefore COM+ explorer shows Single Thread >Apartment at Threading Model no matter Threading Model you select in >VB. >You must always set your COM+ VB project to "Appartment Treaded", >and check "Retain in memory". >Slava >On Wed, 28 Aug 2002 10:10:33 -0700, "keith" - Hide quoted text - - Show quoted text - Quote: >>When desinging a ActiveX dll component, there are only >>two options for Threading Model (in Project Properties >>page), Apartment Threaded and Single Threaded. >>After compiling the component and installing it into >>COM+, I checked its Properties in Concurrency tab and it >>shows Single Thread Apartment at Threading Model no matter >>what Threading Model I selected when designing the >>component. >>Do it means that Apartement Threaded and Single Threaded >>are same for VB ActiveX dll? >>Thanks >>Keith >.
Sun, 20 Feb 2005 03:04:47 GMT

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