GSOAP例子——calc

一、readme

Simple calculator service implements:
- add(a,b)
- sub(a,b)
- mul(a,b)
- div(a,b)
- pow(a,b)
Compilation in C (see samples/calc):
soapcpp2 -c calc.h
cc -o calcclient calcclient.c stdsoap2.c soapC.c soapClient.c
cc -o calcserver calcserver.c stdsoap2.c soapC.c soapServer.c

二、calc.h

int ns__add(double a, double b, double *result);

//gsoap ns service method: sub Subtracts two values
int ns__sub(double a, double b, double *result);

//gsoap ns service method: mul Multiplies two values
int ns__mul(double a, double b, double *result);

//gsoap ns service method: div Divides two values
int ns__div(double a, double b, double *result);

//gsoap ns service method: pow Raises a to b
int ns__pow(double a, double b, double *result);

三、calcclient.c和calcserver.c

1.calcclient.c

/*
    calcclient.c

    Example calculator service client in C

    Compilation in C (see samples/calc/calc.h):
    $ soapcpp2 -c calc.h
    $ cc -o calcclient calcclient.c stdsoap2.c soapC.c soapClient.c
    where stdsoap2.c is in the 'gsoap' directory, or use libgsoap:
    $ cc -o calcclient calcclient.c soapC.c soapClient.c -lgsoap

--------------------------------------------------------------------------------
gSOAP XML Web services tools
Copyright (C) 2001-2008, Robert van Engelen, Genivia, Inc. All Rights Reserved.
This software is released under one of the following two licenses:
Genivia's license for commercial use.
--------------------------------------------------------------------------------
Product and source code licensed by Genivia, Inc., [email protected]
--------------------------------------------------------------------------------
*/

#include "soapH.h"
#include "calc.nsmap"

const char server[] = "http://websrv.cs.fsu.edu/~engelen/calcserver.cgi";
/* = "http://localhost:8080"; to test against samples/webserver */

int main(int argc, char **argv)
{ struct soap soap;
  double a, b, result;
  if (argc < 4)
  { fprintf(stderr, "Usage: [add|sub|mul|div|pow] num num\n");
    exit(0);
  }
  soap_init1(&soap, SOAP_XML_INDENT);
  a = strtod(argv[2], NULL);
  b = strtod(argv[3], NULL);
  switch (*argv[1])
  { case 'a':
      soap_call_ns__add(&soap, server, "", a, b, &result);
      break;
    case 's':
      soap_call_ns__sub(&soap, server, "", a, b, &result);
      break;
    case 'm':
      soap_call_ns__mul(&soap, server, "", a, b, &result);
      break;
    case 'd':
      soap_call_ns__div(&soap, server, "", a, b, &result);
      break;
    case 'p':
      soap_call_ns__pow(&soap, server, "", a, b, &result);
      break;
    default:
      fprintf(stderr, "Unknown command\n");
      exit(0);
  }
  if (soap.error)
    soap_print_fault(&soap, stderr);
  else
    printf("result = %g\n", result);
  soap_destroy(&soap);
  soap_end(&soap);
  soap_done(&soap);
  return 0;
}

2.calcserver.c

/*
    calcserver.c
    ......
*/

#include "soapH.h"
#include "calc.nsmap"

int main(int argc, char **argv)
{ SOAP_SOCKET m, s; /* sockets */
  struct soap soap;
  soap_init(&soap);
  if (argc < 2)
    soap_serve(&soap);  /* serve as CGI application */
  else
  { m = soap_bind(&soap, NULL, atoi(argv[1]), 100);
    if (!soap_valid_socket(m))
    { soap_print_fault(&soap, stderr);
      exit(1);
    }
    fprintf(stderr, "Socket connection successful: master socket = %d\n", m);
    for ( ; ; )
    { s = soap_accept(&soap);
      fprintf(stderr, "Socket connection successful: slave socket = %d\n", s);
      if (!soap_valid_socket(s))
      { soap_print_fault(&soap, stderr);
        exit(1);
      } 
      soap_serve(&soap);
      soap_end(&soap);
    }
  }
  return 0;
} 

int ns__add(struct soap *soap, double a, double b, double *result)
{ (void)soap;
  *result = a + b;
  return SOAP_OK;
} 

int ns__sub(struct soap *soap, double a, double b, double *result)
{ (void)soap;
  *result = a - b;
  return SOAP_OK;
} 

int ns__mul(struct soap *soap, double a, double b, double *result)
{ (void)soap;
  *result = a * b;
  return SOAP_OK;
} 

int ns__div(struct soap *soap, double a, double b, double *result)
{ if (b)
    *result = a / b;
  else
  { char *s = (char*)soap_malloc(soap, 1024);
    (SOAP_SNPRINTF(s, 1024, 100), 
                   "<error xmlns=\"http://tempuri.org/\">Can't divide %f by %f</error>",
                    a, b);
    return soap_sender_fault(soap, "Division by zero", s);
  }
  return SOAP_OK;
} 

int ns__pow(struct soap *soap, double a, double b, double *result)
{ *result = pow(a, b);
  if (soap_errno == EDOM)   /* soap_errno is like errno, but compatible with Win32 */
  { char *s = (char*)soap_malloc(soap, 1024);
    (SOAP_SNPRINTF(s, 1024, 100), 
                    "<error xmlns=\"http://tempuri.org/\">Can't raise %f to %f</error>",
                    a, b);
    return soap_sender_fault(soap, "Power function domain error", s);
  }
  return SOAP_OK;
} 

四、使用与总结

４.１、步骤

1、在服务端先运行：

./calcserver

２、在客户端运行

./calcclient add 1 2

3、结果输出：

result = 3

４.2、总结

• client端程序运行可把前几个参数传入server端
• client端程序想带从server出的参数一定要放在最后一个参数，gsoap规定的
• server端的程序是自己按照需求去实现的，但是切记加入第一参数fun(struct soap *soap,x,y)