How can a Managed C Bridge DLL Facilitate Communication Between Unmanaged C Clients and a WCF Service?

Using a Managed C Bridge DLL to Call a WCF Service

You face the challenge of having unmanaged C clients communicate with a WCF service. To address this need, a step-by-step guide has been provided:

1. Establish WCF Service Infrastructure

   • Create a WCF service using C# (IHelloService) and a service host (HelloService) in a Windows NT Service.
   • Add a service reference to HelloServiceClient from the Hello Service.

2. Connect Unmanaged Code to WCF Service

   • Create a C class (HelloServiceClientBridge) exposing the SayHello() method.
   • Implement this method using managed C to establish a binding, endpoint address, and client to access the WCF service.
   • Handle communication exceptions by closing or aborting the client.

3. Bridge Unmanaged and Managed Code

   • Create an interface (IHelloServiceClientBridge) for the SayHello() method and expose it as a DLL.
   • In the HelloServiceClientBridge.cpp file, implement the SayHello() method using managed C to bridge between unmanaged C and managed HelloService.

4. Integrate with Win32 Application

   • In an MFC application, include the IHelloServiceClientBridge header and call SayHello() to interact with the WCF service.
   • Handle return values through exception handling or message boxes.

This approach allows unmanaged C clients to interact with WCF services by leveraging a managed C bridge DLL, enabling communication without the need for .NET-based helper libraries.

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