Consuming the ASP .NET/C# Web Service Application: C++ Program Example

In this exercise we need ASP .NET/C# or ASP /NET VB .NET web service which hosted on the local IIS web server. Fortunately these web services already created in the previous exercises. In this exercise we are going to consume the methods exposed by the web service application previously created in C# (or VB .NET). The ASP .NET web service was hosted on the local IIS web server. Take note there is no C++/CLI ASP .NET web service application template in Visual Studio 2005/2008.

Creating the C++ CLR Console Application

Firstly create a new console application project.

You can use the following project and solution names if you want else change accordingly.

// WebServiceClientCP.cpp : main project file.

#include "stdafx.h"

using namespace System;

using namespace System::Net;

/// <summary>

/// MyMathService gets a WebRequest and sets the default credentials

/// and a custom header on the request.  If you need control over the

/// HTTP semantics of a Web service request it is much better to override

/// the auto generated proxy class so that you don't lose the changes when

/// the proxy gets re-generated.

/// </summary>

public ref class MyMathService:localhost::Service1

{

    // GetWebRequest is called before the SOAP request is sent

    protected:

    virtual WebRequest^ GetWebRequest(System::Uri^ url) override

    {

            // Create a request based on the supplied URI

            WebRequest^ request = WebRequest::Create(url);

            // Set default credentials

            request->Credentials = CredentialCache::DefaultCredentials;

            // Set a custom header value on the request

            request->Headers["custom-header"] = "custom-value";

            return request;

        }

    };

[STAThread]

int main(array<System::String ^> ^args)

{

    float result;

    // Get x,y from the console, just a demo for addition operation

    Console::WriteLine("Please provide the x and y values to be added");

    Console::Write("X:");

    int x = int::Parse(Console::ReadLine());

    Console::Write("Y:");

    int y = int::Parse(Console::ReadLine());

    // Instantiate the derived math service

    Console::WriteLine("Instantiating the derived math service...");

    MyMathService^ mathService = gcnew MyMathService();

    // Call the add method and print the result

    Console::WriteLine("Call the add method from the ASP web service and print the result...");

    result = mathService->Add((float)x, (float)y);

    Console::WriteLine(x + " + " + y + " = " + result);

    return 0;

}