gsoap实现简单web service应…
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
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，此时在cmd所处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;
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)
{
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
{
soap_thr[i] = soap_copy(&ServerSoap);
fprintf(stderr,"Starting thread %d ",i);
pthread_create(&tid[i],NULL,(void*(*)(void*))process_queue,(void*)soap_thr[i]);
}
for(;;)
{
//接受客户端的连接
s = soap_accept(&ServerSoap);
if (!soap_valid_socket(s))
{
if (ServerSoap.errnum)
{
soap_print_fault(&ServerSoap,stderr);
continue;
}else
{
fprintf(stderr,"Server timed out ");
break;
}
}
//客户端的IP地址
fprintf(stderr,"Accepted connection from IP= %d.%d.%d.%d socket = %d ",
((ServerSoap.ip)>>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;
}