Web Service 开发工具 gSOAP 简介

目录

一 服务器端

二 对应的客户端

三 遇到的问题


gSOAP是一个夸平台的,用于开发Web Service服务端和客户端的工具,在Windows、Linux、MAC OS和UNIX下使用C和C++语言编码,集合了SSL功能。

下载地址:http://sourceforge.net/projects/gsoap2

官方网站:http://genivia.com/Products/gsoap/index.html

对于Windows平台下开发客户端,首先下载最新的gsoap_win32_2.7.6c.zip包,具体在以下地址:http://optusnet.dl.sourceforge.net/sourceforge/gsoap2/gsoap_win32_2.7.6c.zip

首先查看gsoap的User's Guide,基本就能对gsoap有个全面的了解,通过阅读Sample里的例子程序深入。然后搜索网上其它一些文章,比如:
gSOAP简单多线程服务器程序 http://blog.chinaunix.net/u1/55091/showart_430965.html
纯c gSoap实现WebService            http://hi.baidu.com/2sky2sea/blog/item/40ec5555680279c1b745ae9b.html 


接下来我结合自己的实践与理解,讲讲VC用gsoap下编写webService和客户端程序,有不对的地方还请大家指正,谢谢。
我以网上出现的实现一个简单的加法函数为例,讲讲我在操作过程中遇到的问题。

一 服务器端

1.首先编写 add.h文件:

//gsoap ns service name: add
//gsoap ns service namespace: http://localhost/add.wsdl
//gsoap ns service location: http://localhost
//gsoap ns service executable: add.cgi
//gsoap ns service encoding: encoded
//gsoap ns schema namespace: urn:add

int ns__add( int num1, int num2, int* sum );

2.用gsoap/bin目录下的soapcpp2.exe程序,生成一些文件。可以把soapcpp2.exe拷贝到一add.h目录下,用cmd执行soapcpp2.exe add.h就可以,在这个目录下会自动生成许多将来有用的文件,如add.namap,soapH.h,soapC.cpp,soapClient.cpp,soapServer.cpp等文件。soapcpp2.exe可以带参数执行,具体执行soapcpp2.exe -h查看。

3.新建一个win32控制台工程,加入wsock32.lib库,将刚才生成的那些文件添加到工程中。然后编写webserver.cpp主程序:

#include "add.h"
#include "add.nsmap"

int main(int argc, char* argv[])
{
    
    int m, s; /* master and slave sockets */
    struct soap add_soap;
    soap_init(&add_soap);
    //soap_set_namespaces(&add_soap, add_namespaces);
    
    if (argc < 2)
    {
        printf("usage: %s  \n", argv[0]);
        exit(1);
    }
    else
    { 
        m = soap_bind(&add_soap, NULL, atoi(argv[1]), 100);
        if (m < 0)
        {
            soap_print_fault(&add_soap, stderr);
            exit(-1);
        }
        
        fprintf(stderr, "Socket connection successful: master socket = %d\n", m);
        for ( ; ; )
        { 
            s = soap_accept(&add_soap); 
            if (s < 0)
            { 
                soap_print_fault(&add_soap, stderr);
                exit(-1);
            }
            fprintf(stderr, "Socket connection successful: slave socket = %d\n", s);
            
            soap_serve(&add_soap);//该句说明该server的服务
            soap_end(&add_soap);
        }
    }
    return 0;
}
//server端的实现函数与add.h中声明的函数相同,但是多了一个当前的soap连接的参数
int ns__add(struct soap *add_soap, int num1, int num2, int *sum)
{
    *sum = num1 + num2;
    return 0;
}

4. 编译这个程序,会提示错误,将gsoap_win32目录下stdsoap2.cpp,stdsoap2.h文件加入工程,重新编译如果还有错误,可能是你将add.h生成的文件添加入工程出错的原因。实际上在编写server程序时,无须带Client的那些文件,还有带Lib的文件也无须添加到工程中。再重新编译应该就没有问题了,启动4567端口,在ie中输入localhost:4567,如果显示xml页面,说明程序已经启动。

二 对应的客户端

1。客户端程序代码如下:

#include 
#include 
#include "soapH.h"
#include "add.nsmap"


int add(const char* server, int num1, int num2, int *sum);

int main(int argc, char **argv) 
{
    int result = -1;
    char* server="http://localhost:4567";
    int num1 = 0;
    int num2 = 0;
    int sum = 0;
    if( argc < 3 )
    {
        printf("usage: %s num1 num2 \n", argv[0]);
        exit(0);
    }
    
    num1 = atoi(argv[1]);
    num2 = atoi(argv[2]);
    
    result = add(server, num1, num2, &sum);
    if (result != 0)
    {
        printf("soap err,errcode = %d\n", result);
    }
    else
    {
        printf("%d+%d=%d\n", num1, num2, sum );
    }
    return 0;
}

int add( const char* server, int num1, int num2, int *sum )
{
    struct soap add_soap;
    int result = 0;
    soap_init(&add_soap);
//    soap_set_namespaces(&add_soap, add_namespaces);
    
    //该函数是客户端调用的主要函数,后面几个参数和add.h中声明的一样,前面多了3个参数,函数名是接口函数名ns__add前面加上soap_call_
    soap_call_ns__add( &add_soap, server, "", num1, num2, sum );
    if(add_soap.error)
    {
        printf("soap error:%d,%s,%s\n", add_soap.error, *soap_faultcode(&add_soap), *soap_faultstring(&add_soap) );
        result = add_soap.error;
    } 
    soap_end(&add_soap);
    soap_done(&add_soap);
    return result;
}

2.客户端程序既可以新建一个新的win32控制台程序,将刚才生成的nsmap,soapH.h,soapClient.h等文件加入工程,编译既可。我是直接在原先工程中加入一客户端代码,将webserver.cpp文件移除,并且将soapServer.cpp等server端需要的文件移除,将soapClient.cpp等client端需要的cpp添加到工程,编译既可。
3.启动server程序,F5客户端程序,经测试正常。

三 遇到的问题

1.server端可以编译成CGI方式执行,而并不是绑定到某个端口,这种方式我没有实践。

if (argc < 2) // no args: assume this is a CGI application 
   { 
      soap_serve(&soap); // serve request, one thread, CGI style 
      soap_destroy(&soap); // dealloc C++ data 
      soap_end(&soap); // dealloc data and clean up 
}

2.在编译服务器及客户端程序时一开始对add.h生成的文件添加到工程,经常出现问题,需要自己不调试。特别是链接时段,server/client要与其生成的文件相对应,server调用生成的soapserver.cpp,client调用生成的soapclient.cpp文件。
3.多线程方式,在windows下建议用pthread_win32库,这里给出多线程下的例子。

一 gSOAP需要的头文件:

//gsoap ns service name: calc
//gsoap ns service style: rpc
//gsoap ns service encoding: encoded
//gsoap ns service namespace: http://127.0.0.1:8089/calc.wsdl
//gsoap ns service location: http://127.0.0.1:8089/cal
//gsoap ns schema  namespace:    urn:calc
int ns__add(double a, double b, double *result);
int ns__sub(double a, double b, double *result);
int ns__mul(double a, double b, double *result);
int ns__div(double a, double b, double *result);
int ns__pow(double a, double b, double *result);

二 多线程服务器关键代码

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

/
///宏与全局变量的定义
#define  BACKLOG (100)  
#define  MAX_THR (10)   
#define  MAX_QUEUE (1000)


pthread_mutex_t queue_cs;                        //队列锁
pthread_cond_t  queue_cv;                          //条件变量
SOAP_SOCKET     queue[MAX_QUEUE];   //数组队列
int                           head =0, tail =0;          //队列头队列尾初始化         
//


//
void *      process_queue(void *);        //线程入口函数
int         enqueue(SOAP_SOCKET);  //入队列函数
SOAP_SOCKET dequeue(void);         //出队列函数

//
//线程入口函数
void * process_queue(void * soap)
{
  struct soap * tsoap = (struct soap *)soap;
  for(;;)
  {
        tsoap->socket = dequeue();
        if (!soap_valid_socket(tsoap->socket))
       {
         break;
        }
        soap_serve(tsoap);
        soap_destroy(tsoap);
        soap_end(tsoap);
  }
  return NULL;
}

//入队列操作
int enqueue(SOAP_SOCKET sock)
{
  int status = SOAP_OK;
  int next;
  pthread_mutex_lock(&queue_cs);
  next = tail +1;
  if (next >= MAX_QUEUE) 
    next = 0;
  if (next == head) 
      status = SOAP_EOM;
  else
  {
    queue[tail] =sock;
    tail = next;
  }
  pthread_cond_signal(&queue_cv);
  pthread_mutex_unlock(&queue_cs);
  return status;
}

//出队列操作
SOAP_SOCKET dequeue()
{
  SOAP_SOCKET sock;
  pthread_mutex_lock(&queue_cs);
   while (head == tail )
   {
          pthread_cond_wait(&queue_cv,&queue_cs);
   }
  sock = queue[head++];
  if (head >= MAX_QUEUE)
        {
    head =0;
  }
  pthread_mutex_unlock(&queue_cs);
  return sock;
}


//具体服务方法
//加法的实现
int ns__add(struct soap *soap, double a, double b, double *result)
{
      *result = a + b;
      return SOAP_OK;
} 
//减法的实现
int ns__sub(struct soap *soap, double a, double b, double *result)
{ 
     *result = a - b;
     return SOAP_OK;
} 
//乘法的实现
int ns__mul(struct soap *soap, double a, double b, double *result)
{ 
     *result = a * b;
     return SOAP_OK;
} 
//除法的实现
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);
         sprintf(s, "Can't">http://tempuri.org/">Can't divide %f by %f", a, b);
         return soap_sender_fault(soap, "Division by zero", s);
  }
  return SOAP_OK;
} 
//乘方的实现
int ns__pow(struct soap *soap, double a, double b, double *result)
{ 
  *result = pow(a, b);
  if (soap_errno == EDOM) /* soap_errno 和errorno类似, 但是和widnows兼容 */
  { 
    char *s = (char*)soap_malloc(soap, 1024);
    sprintf(s, "Can't take the power of %f to  %f", a, b);
    sprintf(s, "Can't">http://tempuri.org/">Can't take power of %f to %f", a, b);
    return soap_sender_fault(soap, "Power function domain error", s);
  }
  return SOAP_OK;
} 

//
//主函数
int main(int argc,char ** argv)
{
  struct soap ServerSoap;
     //初始话运行时环境
    soap_init(&ServerSoap);
    //如果没有参数,当作CGI程序处理
    if (argc <2) 
    {       
           //CGI 风格服务请求,单线程
          soap_serve(&ServerSoap);
          //清除序列化的类的实例
         soap_destroy(&ServerSoap);
         //清除序列化的数据
        soap_end(&ServerSoap);     
   }else
   {
     struct soap * soap_thr[MAX_THR];
     pthread_t tid[MAX_THR];
     int i,port = atoi(argv[1]);
     SOAP_SOCKET m,s;
      //锁和条件变量初始化
     pthread_mutex_init(&queue_cs,NULL);
     pthread_cond_init(&queue_cv,NULL);
     //绑定服务端口
    m = soap_bind(&ServerSoap,NULL,port,BACKLOG);
    //循环直至服务套接字合法
    while (!soap_valid_socket(m))
   {
                fprintf(stderr,"Bind port error! ");
                m = soap_bind(&ServerSoap,NULL,port,BACKLOG);
    }
    fprintf(stderr,"socket connection successful %d ",m);
                
     //生成服务线程
    for(i = 0; i >24)&&0xFF,((ServerSoap.ip)>>16)&0xFF,((ServerSoap.ip)>>8)&0xFF,(ServerSoap.ip)&0xFF,(ServerSoap.socket));
      //请求的套接字进入队列,如果队列已满则循环等待
       while(enqueue(s) == SOAP_EOM)
                Sleep(1000);
    }
    //服务结束后的清理工作
    for(i = 0; i < MAX_THR; i++)
    {
      while (enqueue(SOAP_INVALID_SOCKET) == SOAP_EOM) 
       {
           Sleep(1000);
      }
    }
    for(i=0; i< MAX_THR; i++)
    {
      fprintf(stderr,"Waiting for thread %d to terminate ..",i);
      pthread_join(tid[i],NULL);
      fprintf(stderr,"terminated ");
      soap_done(soap_thr[i]);
      free(soap_thr[i]);
    }
    pthread_mutex_destroy(&queue_cs);
    pthread_cond_destroy(&queue_cv);
  }
    //分离运行时的环境
  soap_done(&ServerSoap);
  return 0;
}

 

 

 

 

 

 

 

 

 

 

 

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