COM Interop Presentation comments

&Agenda

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What is COM

ATL project

COM project

------ATLClass.h------

int

GetSelf(int x);

------ATLClass.cpp------

int

ATLClass::GetSelf(int x)

{

return x;

}

------CATLSimple.h------

int

GetSelf(int x)

{

return x;

}

STDMETHOD(GetSelf)(LONG x, LONG* y);

------CATLSimple.cpp------

STDMETHODIMP CATLSimple::GetSelf(LONG x, LONG* y)

{

// TODO: Add your implementation code here

*y=x;

S_OK;

------.c in COMPS project------

COM_i.c

COM_p.c

unmanaged: C++ console call C++ dll

#include "D:/COM/COM/COM_i.c" #include "D:/COM/COM/COM_i.h" int _tmain(int argc, _TCHAR* argv[]) { IATLSimple * isobj=NULL; HRESULT hr=CoInitialize(NULL); if(SUCCEEDED(hr)){ hr=CoCreateInstance(CLSID_ATLSimple, NULL, CLSCTX_INPROC_SERVER, IID_IATLSimple, (void **)&isobj); if(SUCCEEDED(hr)) { long l; isobj->GetSelf(1, &l); cout<<l<<endl; isobj->Release(); } else { cout<<"Failed."<<endl; } } CoUninitialize(); int i; cin>>i; return 0; }

C# dll project

namespace CSharpClassLibrary { public class CSharpClass { public int GetSelf(int x) { return x; } } }

C# console project

namespace CSharpConsole { class Program { [DllImport("COM", EntryPoint = "GetSelf")] public static extern int GetSelf(int x); static void Main(string[] args) { Console.WriteLine(GetSelf(1)); Console.Read(); } } }

Managed: C++ calls C#

#include "stdafx.h" using namespace System; using namespace CSharpClassLibrary; int main(array<System::String ^> ^args) { CSharpClass ^csc=gcnew CSharpClass(); Console::WriteLine(csc->GetSelf(1)); Console::WriteLine(L"Hello World"); Console::Read(); return 0; }

Unmanaged C++

extern "C" _declspec(dllexport) int GetSelf(int x){return x;}