实现程序向网站的POST （MFC版）

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下面给个简单的源码：

#include <afxinet.h>

CString strHeader = "Content-Type: application/x-www-form-urlencoded";
CString strDataFormat = "class_id=1";

CInternetSession session;
CHttpConnection* pConnection = session.GetHttpConnection("http://daids.wordpress.com.cn");
CHttpFile* pFile = pConnection->OpenRequest(CHttpConnection::HTTP_VERB_POST, _T("/post.html?"));
BOOL result = pFile->SendRequest(strHeader, (LPVOID)(LPCTSTR)strDataFormat, strDataFormat.GetLength());
TCHAR* szBuffer = new TCHAR[65535];

int nlen = pFile->Read(szBuffer, 65535);

szBuffer[65534]= '/0';

CFile f;
f.Open("d://1.txt",CFile::modeCreate|CFile::modeWrite);
f.Write(szBuffer, 65535);
f.Close();

参考：

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%26Q");

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%26Q");
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

CString GetPageX(CString m_svr, CString m_page, CString m_formdat)
{

CString m_cont,//返回内容
m_err,//错误信息
s1;
//初始设置
CInternetSession lc_isession;
lc_isession.SetOption(INTERNET_OPTION_CONNECT_TIMEOUT,32000);
lc_isession.SetOption(INTERNET_OPTION_CONNECT_RETRIES,10);
lc_isession.SetOption(INTERNET_OPTION_CONNECT_BACKOFF,1000);
//连接
CHttpConnection *pcon = lc_isession.GetHttpConnection(m_svr,80,"admin","password");
CString FormDataType = _T("Content-Type: application/x-www-form-urlencoded");
//m_formdat=MyReplace(m_formdat,'+');
//异常处理
try
{
CHttpFile *http=pcon->OpenRequest("POST",m_page);
//SetCookie(m_cookie);
http->AddRequestHeaders("Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/x-shockwave-flash, application/msword, */*");
http->AddRequestHeaders("Accept-Language: zh-cn");
http->AddRequestHeaders("Content-Type: application/x-www-form-urlencoded");
http->AddRequestHeaders("Accept-Encoding: gzip, deflate");
http->AddRequestHeaders("User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.1.4322)");
http->AddRequestHeaders("Connection: Keep-Alive");
http->AddRequestHeaders("Cache-Control: no-cache");
//http->AddRequestHeaders("Cookie: FirstLogon=D195593569A134;");
http->SendRequest(FormDataType,(LPVOID)(LPCTSTR)m_formdat,m_formdat.GetLength());
//lc_isession.GetCookie(m_cookie);
//AfxMessageBox(m_cookie);
CString mstr;
m_cont.Empty();
while(http->ReadString(mstr))
{
m_cont+=mstr+"/n";
}
m_cont.Replace("<br>","/r/n");
//m_cont即保存了返回内容
http->Close();
pcon->Close();
//AfxMessageBox(m_cont);
return m_cont;
}
catch (CInternetException* pEx)
{
char mcharerr[100];
pEx->GetErrorMessage(mcharerr,100);
m_err=mcharerr;
return m_cont;
}
}

CString GetPageX(CString m_svr, CString m_page, CString m_formdat)

其中的
m_svr是类似于这样的数据:www.163.com
m_page是类似于这样的数据:/login.asp
m_formdat 是类似于这样的表单数据:
name=yang&password=123