72 Articles match "Functionality"

147 Articles match "Functionality"

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• Marshalling native function pointers
  
  Recently, a customer asked me how to marshal function pointers across managed / unmanaged interop boundaries. If you know a simple API and two attributes and if you are aware of a pitfall specific to marshaling function pointers, the job can be quite easy. In my book I focus on wrapping class libraries that use virtual functions for callbacks instead of function pointers, because virtual functions are the typical C++-like approach for callbacks. The managed equivalent to a native function pointer is a delegate. struct CallbackData. {. of the CLR.
  Marcus' Blog - Friday, April 6, 2007
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• Mixed mode DLLs: Problem with public functions using native types as arguments
  
  Edward Diener asked an very interesting question : Why can't I call a function having arguments of a native type like std::string from another assembly? If you try to compile this code, you will get a disappointing error message: error C3767: 'Conversions::S2S': candidate function(s) not accessible. Why is a public static function S2S of a public type Convesions not accessible? This managed wrapper value type is private, therefore, the Conversions::S2S cannot be called from outside the assembly even though it is a public function of a public type. include. include.
  Marcus' Blog - Tuesday, March 21, 2006
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• Requirements not functionality
  
  In Competitive Engineering Tom Gilb argues that development groups spend a lot of time focusing on functional requirements but they should actually focus on performance and quality requirements: “ From the point of view of understanding ‘competitiveness’, ‘levels of achievement’ and ‘associated risk’, the performance requirements are by far the most interesting requirements. Yet, traditionally, too much attention has been given to specification of functional requirements and resource requirements.” A footnote to the recent discussion of requirements.
  Allan Kelly's Blog - Friday, February 27, 2009
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• Can DLLs export managed functions to native clients?
  
  System::Console::WriteLine("I am f(), a managed function that test.dll exports to native clients"); }. dumpbin /exports test.dll" will show you that there is indeed a native exported function: ordinal hint RVA name. System::Console::WriteLine("I am f(), a managed function that can be called by native clients"); }. System::Console::WriteLine("I am f2(), a managed function that can be called by native clients"); }. The native function main can not call f without some magic that is going on under the hood: Think of a scenario, where f has not even been jit compiled.
  Marcus' Blog - Wednesday, October 19, 2005
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• Rehosting the Workflow Designer in WF4
  
  With Windows Workflow Foundation 4 live has become much better on the rehosting front In fact it is possible to create the fully functional and useful workflow editor below in about 200 lines of code. And loading or saving a workflow is easy to, all it takes is a Load() and Save() function pointing to a XAML file. We could periodically check this Selection but its even easier to subscribe to chances using the Subscribe() function and passing in a handler that is called whenever the selection changes. Note: This blog post is written using the.NET framework 4.0 null ). {.
  The Problem Solver - Wednesday, December 23, 2009
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• Using WF4 bookmarks with IWorkflowInstanceExtension
  
  Neither the WorkflowInvoker not the WorkflowServiceHost contain a ResumeBookmark function so how do we resume a bookmark using either of those execution hosts? Note that the GetAdditionalExtensions() function just returns null as we are not adding extra extensions. The easiest option is to let the activity itself do so in the CacheMetadata() function by using the AddDefaultExtensionProvider() function. Note: This blog post is written using the.NET framework 4.0 Using that in a WorkflowApplication was easy but what about WorkflowInvoker or WorkflowServiceHost? Enjoy!
  The Problem Solver - Wednesday, January 27, 2010
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• Workflow 4 Services and duplex communications
  
  Add a console application, add a service reference to the workflow service and add the following code to the Main() function: static void Main( string [] args). {. Next step is to update the Main() function to host this service: static void Main( string [] args). {. This can be done with an OperationContextScope by replacing the proxy.GetDate() call with the following code in the Main() function: var proxy = new ServiceClient(); using ( new OperationContextScope((IContextChannel)proxy.InnerChannel)). {. public interface IService1. {. OperationContract]. ServiceContract].
  The Problem Solver - Monday, May 3, 2010
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