时间戳

首页 > 解决方案 > 使用 IXMLHttpRequest 的 Web 服务调用不需要的响应文本

c++ - 使用 IXMLHttpRequest 的 Web 服务调用不需要的响应文本

问题描述

使用 IXMLHttpRequest 从 webservice 获取数据。（实际上是 java servlets 文件）。使用以下代码发送请求并从 web 服务获取响应

IXMLHTTPRequestPtr pIXMLHTTPRequest = NULL;
CoInitialize(nullptr);
CATUnicodeString usBuffer;
CATTry
{
    hr = pIXMLHTTPRequest.CreateInstance("Msxml2.XMLHTTP.6.0");
    if (SUCCEEDED(hr) && (pIXMLHTTPRequest != NULL))
    {       
        hr = pIXMLHTTPRequest->open("POST", "URL", false);
        if (SUCCEEDED(hr))
        {
           CATUnicodeString lsusHeaderName;
           lsusHeaderName.Append("Content-Type: application/x-www-form-urlencoded");
           lsusHeaderName.Append("Accept: */*");
           lsusHeaderName.Append("Login-ticket: " + "ticketvalue");
           lsusHeaderName.Append("SecurityContext: " + "securityvalue");
            
            for (int i = 1; i <= ilsusHeaderName.Size(); i++)
            {
                BSTR bstrHeaderName;
                BSTR bstrHeaderValue;
                ilsusHeaderName[i].ConvertToBSTR(&bstrHeaderName);                  
                hr = pIXMLHTTPRequest->setRequestHeader(bstrHeaderName, bstrHeaderValue);                   
            }
            
            CATUnicodeString iusRequestParam = "Type=Reference&Name=87333335-00042063&Revision=A.1";
            if (iusRequestParam != "")
            {
                hr = pIXMLHTTPRequest->send(iusRequestParam.ConvertToChar());
                
            }
            else
            {
                hr = pIXMLHTTPRequest->send();
            }
            
            {
                struct __timeb64 t_stime;   
                struct __timeb64 t_ctime;   
                long lProcTime = 0;
                memset(&t_stime, 0, sizeof(struct __timeb64));
                memset(&t_ctime, 0, sizeof(struct __timeb64));
                long nRedyState = READYSTATE_UNINITIALIZED; 

                                                            
                _ftime64(&t_stime);
                while (nRedyState != READYSTATE_COMPLETE) 
                {
                    
                    _ftime64(&t_ctime);
                    
                    lProcTime = (long)(1000 * (t_ctime.time - t_stime.time) + (t_ctime.millitm - t_stime.millitm));
                    if (lProcTime > HTTP_TIMEOUT)
                    { 
                        break;
                    }
                    nRedyState = pIXMLHTTPRequest->readyState;
                }
            }
            std::cout << "Request status : " << pIXMLHTTPRequest->status << std::endl;              

            if (SUCCEEDED(hr) && (pIXMLHTTPRequest->status == 200))
            {                   
                _bstr_t spbstrResponse = pIXMLHTTPRequest->responseText;
                BSTR bstrString = NULL;
                bstrString = spbstrResponse.GetBSTR();
                usBuffer.BuildFromBSTR(bstrString);
                usOutput = usBuffer;
                std::cout << "Output :  " << usBuffer << std::endl;
                bstrString = NULL;
            }
            else
            {
                std::cout << "Failed to send GET/POST Method." << std::endl;                    
                hr = E_FAIL;
            }
        }
        else
        {               
            hr = E_FAIL;
        }
    }
}

}
    CATCatch(CATError, pError)
{
    std::cout << "Failed to query XMLHTTP 6.0. Perhaps MSXML 6.0 is not exists." << std::endl;
    
}
CATEndTry;

此 Web 服务调用返回 200 状态代码，但响应文本不好。它返回一些 html、javascript 代码作为响应文本。

预期结果是传递对象的属性值之一。示例输出：

{“物理ID”：“646F916E00005E78609AC53D0000974F”}

无法在此代码中找到问题，为什么它返回 html、javascript 代码。由于我是 WINAPI 概念的新手，非常感谢您的帮助。

编辑：通过邮递员检查网络服务并返回预期结果。

标签： c++web-serviceswinapixmlhttprequest

解决方案

标头应该以这种方式传递。这解决了这个问题。

CATListOfCATUnicodeString   lsusHeaderName;
CATListOfCATUnicodeString   lsusHeaderValue;

lsusHeaderName.Append("Content-Type");
lsusHeaderValue.Append("application/x-www-form-urlencoded");    
lsusHeaderName.Append("Login-ticket");
lsusHeaderValue.Append(usLoginTicket);
lsusHeaderName.Append("SecurityContext");
lsusHeaderValue.Append(usSecurityContext);

推荐阅读