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C++使用gsoap建立webService

gSOAP 是一個誇平台的,用于開發 Web Service 服務端和用戶端的工具,在 Windows 、 Linux 、 MAC OS 和 UNIX 下使用 C 和 C++ 語言編碼,集合了 SSL 功能。

下載下傳位址: http://sourceforge.net/projects/gsoap2

官方網站: http://genivia.com/Products/gsoap/index.html

對于 Windows 平台下開發用戶端,首先下載下傳最新的 gsoap_win32_2.7.6c.zip 包,具體在以下位址: http://optusnet.dl.sourceforge.net/sourceforge/gsoap2/gsoap_win32_2.7.6c.zip

首先檢視gsoap的User's Guide,基本就能對gsoap有個全面的了解,通過閱讀Sample裡的例子程式深入。然後搜尋網上其它一些文章,比如:

gSOAP簡單多線程伺服器程式 http://blog.chinaunix.net/u1/55091/showart_430965.html

純c gSoap實作WebService            http://hi.baidu.com/2sky2sea/blog/item/40ec5555680279c1b745ae9b.html  

接下來我結合自己的實踐與了解,講講VC用gsoap下編寫webService和用戶端程式,有不對的地方還請大家指正,謝謝。

我以網上出現的實作一個簡單的加法函數為例,講講我在操作過程中遇到的問題。

一 伺服器端

1.首先編寫 add.h檔案:

1//gsoap ns service name: add

2//gsoap ns service namespace: http://localhost/add.wsdl

3//gsoap ns service location: http://localhost

4//gsoap ns service executable: add.cgi

5//gsoap ns service encoding: encoded

6//gsoap ns schema namespace: urn:add

7

8int ns__add( int num1, int num2, int* sum );

2.用gsoap/bin目錄下的soapcpp2.exe程式,生成一些檔案。可以把soapcpp2.exe拷貝到一add.h目錄下,用cmd執行 soapcpp2.exe add.h就可以,在這個目錄下會自動生成許多将來有用的檔案,如 add.namap,soapH.h,soapC.cpp,soapClient.cpp,soapServer.cpp等檔案。 soapcpp2.exe可以帶參數執行,具體執行soapcpp2.exe -h檢視。

3.建立一個win32控制台工程,加入wsock32.lib庫,将剛才生成的那些檔案添加到工程中。然後編寫webserver.cpp主程式:

#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 <server_port> /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);//該句說明該server的服務

soap_end(&add_soap);

}

}

return 0;

}

//server端的實作函數與add.h中聲明的函數相同,但是多了一個目前的soap連接配接的參數

int ns__add(struct soap *add_soap, int num1, int num2, int *sum)

{

*sum = num1 + num2;

return 0;

}

4. 編譯這個程式,會提示錯誤,将gsoap_win32目錄下stdsoap2.cpp,stdsoap2.h檔案加入工程,重新編譯如果還有錯誤,可能是 你将add.h生成的檔案添加入工程出錯的原因。實際上在編寫server程式時,無須帶Client的那些檔案,還有帶Lib的檔案也無須添加到工程 中。再重新編譯應該就沒有問題了,啟動4567端口,在ie中輸入localhost:4567,如果顯示xml頁面,說明程式已經啟動。

二 對應的用戶端

1。用戶端程式代碼如下:

#include <stdio.h>

#include <stdlib.h>

#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, ∑);

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);

//該函數是用戶端調用的主要函數,後面幾個參數和add.h中聲明的一樣,前面多了3個參數,函數名是接口函數名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.用戶端程式既可以建立一個新的win32控制台程式,将剛才生成的nsmap,soapH.h,soapClient.h等檔案加入工程,編譯既可。 我是直接在原先工程中加入一用戶端代碼,将webserver.cpp檔案移除,并且将soapServer.cpp等server端需要的檔案移除,将 soapClient.cpp等client端需要的cpp添加到工程,編譯既可。

3.啟動server程式,F5用戶端程式,經測試正常。

三 遇到的問題

1.server端可以編譯成CGI方式執行,而并不是綁定到某個端口,這種方式我沒有實踐。

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.在編譯伺服器及用戶端程式時一開始對add.h生成的檔案添加到工程,經常出現問題,需要自己不調試。特别是連結時段,server/client要 與其生成的檔案相對應,server調用生成的soapserver.cpp,client調用生成的soapclient.cpp檔案。

3.多線程方式,在windows下建議用pthread_win32庫,這裡給出多線程下的例子。

一 gSOAP需要的頭檔案:

//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 多線程伺服器關鍵代碼

#include

#include "calc.nsmap"

#include "soapH.h"

/**//

///宏與全局變量的定義

#define BACKLOG (100)

#define MAX_THR (10)

#define MAX_QUEUE (1000)

pthread_mutex_t queue_cs; //隊列鎖

pthread_cond_t queue_cv; //條件變量

SOAP_SOCKET queue[MAX_QUEUE]; //數組隊列

int head =0, tail =0; //隊列頭隊列尾初始化

/**///

//

void * process_queue(void *); //線程入口函數

int enqueue(SOAP_SOCKET); //入隊列函數

SOAP_SOCKET dequeue(void); //出隊列函數

/**///

//線程入口函數

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;

}

//入隊列操作

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;

}

//出隊列操作

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;

}

/**///具體服務方法

//加法的實作

int ns__add(struct soap *soap, double a, double b, double *result)

{

*result = a + b;

return SOAP_OK;

}

//減法的實作

int ns__sub(struct soap *soap, double a, double b, double *result)

{

*result = a - b;

return SOAP_OK;

}

//乘法的實作

int ns__mul(struct soap *soap, double a, double b, double *result)

{

*result = a * b;

return SOAP_OK;

}

//除法的實作

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;

}

//乘方的實作

int ns__pow(struct soap *soap, double a, double b, double *result)

{

*result = pow(a, b);

if (soap_errno == EDOM) /**//* soap_errno 和errorno類似, 但是和widnows相容 */

{

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;

}

/**///

//主函數

int main(int argc,char ** argv)

{

struct soap ServerSoap;

//初始話運作時環境

soap_init(&ServerSoap);

//如果沒有參數,當作CGI程式處理

if (argc <2)

{

//CGI 風格服務請求,單線程

soap_serve(&ServerSoap);

//清除序列化的類的執行個體

soap_destroy(&ServerSoap);

//清除序列化的資料

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;

//鎖和條件變量初始化

pthread_mutex_init(&queue_cs,NULL);

pthread_cond_init(&queue_cv,NULL);

//綁定服務端口

m = soap_bind(&ServerSoap,NULL,port,BACKLOG);

//循環直至服務套接字合法

while (!soap_valid_socket(m))

{

fprintf(stderr,"Bind port error! ");

m = soap_bind(&ServerSoap,NULL,port,BACKLOG);

}

fprintf(stderr,"socket connection successful %d ",m);

//生成服務線程

for(i = 0; i <MAX_THR; 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(;;)

{

//接受用戶端的連接配接

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;

}

}

//用戶端的IP位址

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));

//請求的套接字進入隊列,如果隊列已滿則循環等待

while(enqueue(s) == SOAP_EOM)

Sleep(1000);

}

//服務結束後的清理工作

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);

}

//分離運作時的環境

soap_done(&ServerSoap);

return 0;

}

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