在VC中WININET如何使用HTTP的POST方法

SUMMARY
To properly simulate a Form submission using WinInet, you need to send a header that indicates the proper Content-Type. For Forms, the proper Content-Type header is: Content-Type: application/x-www-form-urlencoded
                 
MORE INFORMATION
     In many cases, the server does not respond appropriately if a Content-Type is not specified. For example, the Active Server Pages component of IIS 3.0 actually checks this header specifically for 'application/x-www-form- urlencoded' before adding form variables to the "Request.Form" object. This MIME/Content-Type indicates that the data of the request is a list of URL- encoded form variables. URL-encoding means that space character (ASCII 32) is encoded as ' ', special character such '!' encoded in hexadecemal form as '!'.

Here is a snippet of code that uses the MFC WinInet classes to simulate a Form POST request:

CString strHeaders = _T("Content-Type: application/x-www-form-urlencoded");
// URL-encoded form variables -
// name = "John Doe", userid = "hithere", other = "P&Q"
CString strFormData = _T("name=John Doe&userid=hithere&other=P&Q");
CInternetSession session;
CHttpConnection* pConnection = session.GetHttpConnection(_T("ServerNameHere"));
CHttpFile* pFile = pConnection->OpenRequest(CHttpConnection::HTTP_VERB_POST,_T("FormActionHere"));
BOOL result = pFile->SendRequest(strHeaders,(LPVOID)(LPCTSTR)strFormData, strFormData.GetLength());

Without MFC, the same code translates to straight SDK calls as follows:

static 

TCHAR hdrs[] = _T("Content-Type: application/x-www-form-urlencoded");

static

TCHAR frmdata[] = _T("name=John Doe&userid=hithere&other=P&Q");
statuc TCHAR accept[] = _T("Accept: */*");
    
// for clarity, error-checking has been removed
HINTERNET hSession = InternetOpen("MyAgent",INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
HINTERNET hConnect = InternetConnect(hSession, _T("ServerNameHere"),
                                     INTERNET_DEFAULT_HTTP_PORT,
                                     NULL,
                                     NULL,
                                     INTERNET_SERVICE_HTTP,
                                     0,
                                     1);
HINTERNET hRequest = HttpOpenRequest(hConnect, 
                                     "POST",
                                     _T("FormActionHere"), 
                                     NULL, 
                                     NULL, 
                                     accept, 
                                     0, 
                                     1);
HttpSendRequest(hRequest, 
                hdrs, 
                strlen(hdrs), 
                frmdata, 
                strlen(frmdata));

// close any valid internet-handles

我这里有一段程序，用来在一个对话框里显示出一次http     request的原始信息，不过使用Inet     API做的，希望能有帮助。   

void CHTTPRequestDlg::OnButtonRequest() 
}

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使用MFC示例如下:   
    首先设置m_strRequest请求字符串       eg."name=aaa&pass=bbb";               
                    m_strServerName     服务器名称或者IP       eg."www.yahoo.com"   
                    m_strObjectName     请求文件位置     eg.     "pub/aaa.asp"   
        请求的结果存放在m_strHtml中   

void func()
}

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1、获得WebBrowser     Control的DWebBrowserEvents2::DocumentComplete事件   
    2、在DWebBrowserEvents2::DocumentComplete事件中根据IWebBrowser2::Document获得IHTMLDocument2   
    3、IHTMLDocument2::forms得到IHTMLElementCollection   
    4、在IHTMLElementCollection中根据name、tagName、ID得到指定的IHTMLElement   
    5、从IHTMLElement得到IHTMLFormElement   
    6、执行IHTMLFormElement::submit