GSoap client can not pass argument value to server

Question

step 1, i had create an WebService using ASP.NET (C#):

[WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    public class WebService1 : System.Web.Services.WebService
    {

        [WebMethod]
        public string HelloWorld(int a, int b)
        {
            return a.ToString() + "," + b.ToString();
        }
    }

step 2, and then i use gsoap_2.8.12 generate code, following command:

 wsdl2h -c -o a.h http://localhost:29556/WebService1.asmx?WSDL
  soapcpp2 -c -C -I import a.h

step3, create an empty C project in VC, add the following files: soapH.h soapStub.h stdsoap2.h soapC.c soapClient.c stdsoap2.c

step4, config the folders, and create a new class :

#include <stdio.h>
#include "WebService1Soap.nsmap";

void main()
{
    struct soap soap;
    int ret;
    struct _ns1__HelloWorld hello;
    struct _ns1__HelloWorldResponse respHello;
    int arg1, arg2;

    soap_init(&soap);
    hello.a = 2;
    hello.b = 3;

    ret = soap_call___ns1__HelloWorld(&soap, NULL, NULL, &hello, &respHello);
    if (ret == SOAP_OK)
    {
        printf("return :%s", respHello.HelloWorldResult);
    }
    else
    {
        printf("error :%d", ret);
    }

    getchar();
}

Problem: the return value is "0,0", as we expect it should be "2,3", Please tell me what i had missed about these things ? thanks!

Answer 1

after hours work, i had fixed this thing, if you are using WCF , you need add an attribute into your operation, for example:

[ServiceContract]
    public interface IMyService
    {
        [OperationContract]
        [XmlSerializerFormat(Style = OperationFormatStyle.Rpc, Use = OperationFormatUse.Literal)]
        long Method1(int a, int b, long c, string d);
     }

if using WebService, that should be:

[WebMethod]
        [System.Web.Services.Protocols.SoapRpcMethodAttribute(Use = System.Web.Services.Description.SoapBindingUse.Literal)]
        public string HelloWorld(int a, int b)
        {
            return a.ToString() + "," + b.ToString();
        }

so the gsoap can send the argument value correctly to server.