Write COM components in C + + and call with C #

1. Open vs as Administrator, especially important, otherwise it will not succeed

2. Create a new C + + ATL project, all the default settings

3. Add an ATL Simple object, added from the Add class,

4. Add a method, note that it is added in Class View, and follow the settings, the rest is the default

5. Then add code to the Test.cpp file to generate it. A COM component is made.

STDMETHODIMP Ctest::a, LONG b, LONG* c){    // TODO: 在此添加实现代码    a + b;    return S_OK;}

6. Add a reference in C # to the generated DLL file path.

After the reference:

7. Add code and run

using  system;using  System.Collections.Generic; using  System.Linq; using  System.Runtime.InteropServices; using  System.Text; using  Atlproject1lib; namespace  csharpMatlab  { class   Program  { static  void  Main (
    
     string  [] args) {Test a = 
     new  test ();        Console.WriteLine (A.add (
     4 , 
     7 )); }    }}
    

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Write COM components in C + + and call with C #