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When implementing a COM object with an Interop Assembly, you are performing early binding. In other words, the COM object is connected to the calling application at compile time. In the absence of an Interop Assembly, it is still possible to connect to a COM object as long as the COM object implements IDispatch. This form of connection, which is done at runtime, is called late binding. To perform late binding on a COM object, you have to know the COM progID, the Registry entry associated with the COM object. Then with the COM progID, you use reflection (see 18 for a refresher on reflection) to invoke the COM object s methods. Implementing late binding using reflection for COM objects is very similar to using reflection with assemblies. The big difference is that you use the static method Type::GetTypeFromProgID() to get the Type object (which represents the coclass) instead of the Type::GetType() method. To help you understand how to code late binding of a COM object, let s look at the full example first and then walk through it step by step. Listing 21-10 provides the same functionality as the early binding example. Listing 21-10. Invoking the COM Using Late Binding using namespace System; using namespace System::Reflection; int main(array<System::String ^> ^args) { Type ^typeTestCom = Type::GetTypeFromProgID(L"CTestCOM.CTestCOM");

if (typeTestCom == nullptr) { Console::WriteLine("Getting CTestCOMCTestCOM failed"); return -1; } try { Object ^TestComLBnd = Activator::CreateInstance(typeTestCom); array<Object^>^ param = gcnew array<Object^> { 4 }; Object ^ret = typeTestCom->InvokeMember( L"Square", Reflection::BindingFlags::InvokeMethod, nullptr, TestComLBnd, param); Console::WriteLine("Square of 4 is {0}", ret); } catch (Exception ^ex) { Console::WriteLine("Error when invoking Square method: {0}", ex->Message); } return 0; } First you get a reference to the Type for which you will invoke members To do this, you pass the progID to the GetTypeFromProgID() method, which returns a Type object that represents the coclass of the COM object If the progID cannot be found in the Registry or some other error occurs, the GetTypeFromProgID() method returns a nullptr Therefore, after I try to get the coclass Type object, I check to see if the value is nullptr and if it is, I quit.

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nit testing is a repeatable, automated process of testing specific methods in code to make sure that they do what they are supposed to do. By testing the smallest unit of code for defects, you can be sure that when you are finished, you have a stable base on which to build. The automated nature of unit tests also allows for regression testing, which is the process of retesting previously tested units of code after a modification is made. Unit testing is an area of testing that for many years was performed in a nonrepeatable and haphazard way. Typically, developers would, in addition to having to write the application, also need to write a test harness to run tests. With the introduction of tools such as JUnit for Java and NUnit for .NET, unit testing has become much easier. This chapter explains how to perform unit tests with VSTS, ranging from simple onemethod tests to data-driven tests based on data stored in a testing database. In addition, we will look at code coverage results from the unit tests. Code coverage describes the amount of code covered by the unit tests (including manual unit tests). We ve included this chapter in the Developers section of this book because developers are responsible for their code. While testers also may create unit tests, they generally test larger pieces of functionality. However, some items covered in this chapter relate to all types of testing, so it is worthwhile for testers to read through this chapter as well.

Similar to how WCF works with the WS-MEX protocol to dynamically derive the COM and WCF interfaces and types, the service moniker can also work with a WSDL contract. Listing 10 14, contained in the file QuickReturnsScriptClientWsdl.vbs, illustrates how to make a call using the service moniker for WSDL. Listing 10 14. QuickReturns Ltd. Script Using the WSDL Service Moniker Option Explicit Dim quoteProxy, wsdl, moniker, result wsdl = GetWsdlFromUrl ("http://localhost/QuickReturnsQuotes/service.svc wsdl" ) moniker="service:wsdl=" & wsdl & ", " moniker=moniker + "address=http://localhost/QuickReturnsQuotes/service.svc," moniker=moniker + "contract=IQuoteService, " moniker=moniker + "contractNamespace=http://tempuri.org/, " moniker=moniker + "binding=WSHttpBinding_IQuoteService, "

Now that I have the coclass Type, I need to create an instance of it with the static method Activator::CreateInstance() The CreateInstance() method returns a number of exceptions so I enclose it in a try/catch block, but under normal operations these exceptions should not occur since I have already retrieved a valid coclass Type using the method GetTypeFromProgID() All that is left is to invoke the member using the aptly named Type member method InvokeMember() This method takes five parameters: The name of the method to invoke The type of operation to perform as a BindingFlag enumeration In this case, it will normally be InvokeMethod A reference to a binder object (which you can safely ignore so just pass nullptr) The reference to an instance of the coclass Type that the operation will be invoked on An array of Objects that you want to pass as arguments.

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