How to Leverage IJW for Seamless C# Library Integration in Native C ?

How to Call a C# Library from Native C Using IJW

Background:

The need arises to integrate a C# library into unmanaged C code. Among the available methods, Interlace Services using C /CLI and IJW (Interoperability with JavaScript and Windows Runtime) appears promising.

Question:

1. Advantages of IJW: Does IJW offer any benefits over com objects or PInvoke?
2. C /CLR Wrapper: How can you create a C /CLR wrapper that employs IJW to call a C# library?
3. Native C Integration: How do you connect an unmanaged C file with a C /CLR library?

Answer:

1. Advantages of IJW over COM Objects and PInvoke:

• IJW simplifies the process of passing and retrieving data between managed and unmanaged code.
• It eliminates the need for manual marshaling and data conversion.

2. Creating a C /CLR Wrapper with IJW:

1. Create a new C /CLI Class: Add a C /CLI class to your project and name it accordingly.
2. Enable CLR Support: Right-click on the .cpp file of the new class and enable /clr in the project properties.
3. Add Namespace References: Use the "Additional #using directories" property to add a reference to your C# DLL's location.

3. Native C Integration:

1. Include C /CLR Header: In the unmanaged C file, include the header file generated by the C /CLR wrapper class.
2. Create an Instance of the Wrapper Class: Use the constructor of the wrapper class to instantiate an object.
3. Call Managed Methods: Access the managed methods of the C# library through the wrapper class object.

Sample Code:

Native.h:

void NativeWrapMethod();

Native.cpp:

#using "mscorlib.dll"
#using "MyNet.dll"

using namespace MyNetNameSpace;

void NativeWrapMethod()
{
    MyNetNameSpace::MyManagedClass::Method(); // static method
}

This approach enables you to call a managed C# class and its methods from native C code.

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