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Fortunately, you only need two files to implement a managed wrapper class: the COM object s DLL file and a header file containing the interface definitions of the COM object. Conveniently for me, Visual Studio generates all the files I need. Where you get them for your third-party COM objects may be a little more challenging. All I needed to do was copy vc90.h and TestCOM.dll, generated when TestCOM.cpp was compiled in Visual Studio, to the source directory of the example project. I also renamed vc90.h to TestCOM.h so that it has more meaning. Listing 24-5 shows how to write a simple managed wrapper class. Listing 24-5. A Simple Managed Wrapper Class #include "TestCOM.h" #include <msclr/com/ptr.h> #import "TestCOM.dll" raw_interfaces_only using namespace System; using namespace msclr; ref class rcTestCOM {

Now that you have recorded a test, you need to be able to play it back for actual use in a test. There are various ways to replay a test depending on the type of test you are setting up (for example a load test does not work via a user interface so what follows does not apply to this type of playback).

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private: com::ptr<ITestCOM> test; public: rcTestCOM() { // test.CreateInstance(L"CTestCOM.CTestCOM"); // or test.CreateInstance(__uuidof(CTestCOM)); } long Square(int val) { long ret; test->Square(val, &ret); return ret; } }; int main(array<System::String ^> ^args) { rcTestCOM^ test = gcnew rcTestCOM(); long ret = test->Square(4); Console::WriteLine("The Square of 4 is {0}", ret); return 0; } As you can see, it is remarkably easy to code a managed wrapper class. There is one very big gotcha: you must include the COM objects interface header file before your <msclr/com/ptr.h> header. If you don t, you will get a huge number of undefined errors returned from the compiler.

- (void)encodeWithCoder:(NSCoder *)encoder { [encoder encodeObject:self.path forKey:@"path"]; [encoder encodeObject:self.fillColor forKey:@"fillColor"]; [encoder encodeObject:self.strokeColor forKey:@"strokeColor"]; } - (id)initWithCoder:(NSCoder *)decoder { if ((self = [self init])) { self.path = [decoder decodeObjectForKey:@"path"]; self.fillColor = [decoder decodeObjectForKey:@"fillColor"]; self.strokeColor = [decoder decodeObjectForKey:@"strokeColor"]; } return self; }

After the include files, you import your COM object DLL with an attribute of raw_interfaces_ only. This attribute supresses the generation of error-handling wrapper functions and property declarations that use those wrapper functions and thus causes only the low-level contents of the type library to be exposed. The managed wrapper class has a simple construct, starting with a private com::ptr to the COM object: com::ptr<ITestCOM> test; It has a constructor that creates an instance of the com::ptr. There are several overloads of the CreateInstance() method. The two overloads I use most often, which also happen to be the simpliest, are passing the ProgID (or programmatic identifier found in the Registry) of the COM object: test.CreateInstance(L"CTestCOM.CTestCOM"); and passing the CLSID (or a globally unique identifier that identifies a COM class object; this is also found in the Registry). To get the CLSID, you can use the keyword __uuidof, which retrieves the GUID attached to the expression. In this case, the GUID also happens to be the CLSID:

It is a best practice that once you record your test you play it back to ensure that it will work correctly Tip

test.CreateInstance(__uuidof(CTestCOM)); After the constructor, the managed wrapper class is then made up of all methods we want to expose from the managed wrapper. In this example, there happens to be only one method: long Square(int val) { long ret; HRESULT hr = test->Square(val, &ret); return ret; } Notice that unlike the Interop Assembly version of the COM object functions, the com::ptr exposes the functions as they are coded in their COM object. In other words, a HRESULT is returned from the function instead of the expected return value and the expected return value is accessed via an [out] parameter. One thing you may have noticed is there are no AddRef() or Release() methods anywhere in the managed wrapper class. The reason is that the com::ptr automates the lifetime management of the COM object. In other words, it handles all that plumbing for you. The rather unspectacular result of this code is shown in Figure 24-4.

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