webservice gsoap 小记

参考 http://www.cs.fsu.edu/~engelen/soap.html

1. web service client application

　　> wsdl2h -s -o MyHead.h http://www.genivia.com/calc.wsdl

　　　　-s 不用 STL

　　> soapcpp2 -i -C MyHead.h

　　　　Option -i (and alternatively option -j) indicates that we want C++ proxy and server objects that include the client (and server) code, -C indicates client-side only 

　　　　soapcpp2 generates both client and server stubs and skeletons by default

　　

　　这两步过程中可能会出错，要把必要的文件加上: soap12.h  stdsoap2.h  stdsoap2.cpp

　　然后，We use the generated soapcalcProxy class and calc.nsmap XML namespace mapping table to access the Web service. The soapcalcProxy class is a proxy to invoke the service:

#include "soapWebService1SoapProxy.h"    // 自动生成的头文件 注：不用MyHead.h
#include "WebService1Soap.nsmap"

int main()
{
    WebService1SoapProxy        service;
    _tempuri__GetSum            a;
    _tempuri__GetSumResponse    result;
    //a.soap = soap_new();
    a.a = 1;
    a.b = 5;
    //result.soap = soap_new();
    
    if (service.GetSum(&a, &result) == SOAP_OK)
        std::cout << "the num of 1 and 5 is " << result.GetSumResult << std::endl;
    else
        service.soap_stream_fault(std::cerr);
    service.destroy();

    getchar();
    return 0;
}

　　编译

　　如果遇到 stdsoap2.obj : error LNK2001: 无法解析的外部符号_namespaces

　　参考 http://blog.163.com/lyz_sea/blog/static/115586707201182432412677

　　在 stdsoap2.h，添加 

　　#ifndef WITH_NONAMESPACES
　　#define WITH_NONAMESPACES
　　#endif

2. Develop a Web Service (Stand-Alone Server)

　　

// File: currentTime.h 
//gsoap ns service name: currentTime 
//gsoap ns service namespace: urn:currentTime 
//gsoap ns service location: http://www.yourdomain.com/currentTime.cgi 
int ns__currentTime(time_t& response);

　　> soapcpp2 -i -S currentTime.h

　　

// File: currentTime.cpp
#include "soapcurrentTimeService.h" // include the proxy declarations
#include "currentTime.nsmap" // include the XML namespace mappings
int main()
{
    // create server and serve on CGI-based request:
    currentTimeService    server;
    /*server.serve();
    server.destroy();
    */

    while (server.run(65533) != SOAP_TCP_ERROR)
    {
        server.soap_stream_fault(std::cerr);
    }

    return 0;
}

int currentTimeService::currentTime(time_t& response)
{
    response = time(0);
    return SOAP_OK;
}

　　Compile with  currentTime.cpp  soapC.cpp  soapcurrentTimeService.cpp  stdsoap2.cpp

　　

　　run

　　然后可以由 wsdl 文件生成客户端头文件，and ...

3. C# 调用 gsoap 的 service

　　参考 http://blog.sina.com.cn/s/blog_4e7d38260100ade4.html

　　用 VS 自带的 wsdl.exe (在 C 盘的某个角落)

　　> wsdl.exe currentTime.wsdl

　　生成 currentTime.cs

　　将 currentTime.cs 放到 C# 的工程中，研究下代码结构，找到 currentTime 的初始化函数：

    public picture() {
        this.Url = "http://localhost:65432/picture.cgi"; // 改成你的地址  
    }

　　OK，可以用了。

4. 如果要发送 二进制数据，可先将其进行编码(暂时采用 base64 编码，实际场景中应采用更合适的编码算法)，以 string 形式发送。接收端再进行相应解码。

　　C++ gsoap service 端，读取图片：

　　

int pictureService::picture(struct picdata &picture)
{
    char *pic = NULL;
    unsigned int length = 0;

    std::ifstream is("chicken.jpg", std::ios::binary);
    if (is)
    {
        is.seekg(0, is.beg);
        is.seekg(0, is.end); 
        length = is.tellg();
        is.seekg(0, is.beg);

        pic = new char[length];

        if (pic == NULL)
            return SOAP_ERR;
        
        is.read(pic, length);
        is.close();
    }

    picture.data = base64_encode((unsigned char*)pic, length);

    if (pic != NULL)
    {
        delete pic;
        pic = NULL;
    }

    return SOAP_OK;
}

　　C# 端，调用 webservice，获取一张图片，并保存：

    picture pic = new picture();
    picture1 pic1 = new picture1();
    pictureResponse res = pic.Callpicture(pic1);

    string strData = res.picture.data;
    byte[] bytes = Convert.FromBase64String(strData);

    FileStream fs = new FileStream("D:\\picture.jpg", FileMode.OpenOrCreate);
    fs.Write(bytes, 0, bytes.Length);
    fs.Close();

 　　以上代码，有待优化。