Interoperability in Visual Studio .NET

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Breakpoint 0 hit eax=000c3078 ebx=00249fe8 ecx=0026eb98 edx=79ec7f60 esi=001df258 edi=001df4bc eip=6f2e1590 esp=001df228 ebp=001df240 iopl=0 nv up ei pl zr na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000246 05Native!Myfunc: 6f2e1590 55 push ebp
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After the breakpoint is reached, we can look at the argument passed to the function:
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0:000> dv 0:000> dd 0026eb98 0:000> dd 00270078 0:000> da 00272a48 ptr = 0x0026eb98 0x0026eb98 l3 00270078 00270090 002700a8 00270078 l4 00272a48 0025eb40 0025eda0 0000001e 00272a48 "First Name 1"
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The dv command displays the parameters to the function (0x0026eb98), which corresponds to an instance of the Table structure We then use the dd command to display the pointers to the nodes contained within the array Subsequently, we again use the dd command to display the contents of the first node in the array and the da command on the first element to display the first element, which happens to be a string representing the first name To convince ourselves that the parameter is indeed intact and proper, we could continue using this strategy for the rest of the nodes and elements Always remember to set a breakpoint in the native code function being called followed by verification that the data passed is proper by using the plethora of dump commands So far, we have discussed the P/Invoke method of calling into native code, but there is another interoperability layer that is commonly used called the COM Interoperability layer
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The Component Object Model (COM) is a binary interface that was introduced by Microsoft in 1993 It provides a common way of defining language neutral components that can be created and used across machine boundaries Even though COM was introduced as a standard, it enjoyed most of its success on the Windows platform where
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the number of available COM objects grew rapidly Due to this success and with the advent of NET, a key feature was to allow managed code to easily interact with existing COM objects and thus the COM interoperability layer was born COM interop is simply a way to interact with native code and more specifically native code implemented as COM objects The interaction can be bidirectional in the sense that managed code can call into existing native code COM objects as well as native code calling into managed objects exposed as COM objects We ll focus our discussion on the most common type of COM interop, namely at how NET allows managed code to call into a native code COM object
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7 INTEROPERABILITY
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Earlier in the chapter, we discussed the P/Invoke layer and how it can be used to interact with native code modules (DLLs) At a high level, the algorithm used by the P/Invoke layer is 1 2 3 4 Load the specified module (DLL) into the process address space Find the address of the function of interest Marshall data Call the function
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COM interop is slightly more complicated because it has its own registration, instantiation, lifetime management, and marshaling semantics Rather than requiring each managed code application to implement the necessary code to locate, instantiate, acquire interfaces, and manage the marshaling, the COM interop layer has the capability to generate all the code necessary and produce what is known as an interop assembly The interop assembly is best viewed as a managed proxy to the underlying COM object with a familiar NET object model rather making it easier to program against To get a better idea of how this mechanism works, we will be using a simple COM object that exposes one method called Add Due to the simplicity, we won t worry about the actual native code; rather, we will only list the interface definition for the COM object as shown in Listing 7-3 Listing 7-3 IDL for simple COM object
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interface IBasicMath : IUnknown { [helpstring("method Add")] HRESULT Add([in] LONG num1, [in] LONG num2, [out] LONG* res); };
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