Simulate a Form POST Request Using WinInet

这是MSDN中的一篇文章，说的是用WinInet来模拟表单的发送，用的是VC及SDK两种方法实现的，用文中方法便可以实现直接将表单发送到WEB服务器上了，比直接在网页上填表高明多了。

原文较短且很简单，就没翻译，直接帖上来了，没弄明白MSDN中的算转帖还是算收藏，反正哪位仁兄能用上就行了

HOWTO: Simulate a Form POST Request Using WinInetLast reviewed: February 10, 1998

Article ID: Q165298

The information in this article applies to:

The Microsoft Foundation Classes (MFC) included with: - Microsoft Visual C++, 32-bit Editions, versions 4.2, 5.0

Microsoft Internet Client SDK, versions 4.0, 4.01

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 '%21'.

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

REFERENCES

For more information on URL-encoding and the format of a Form POST request, see section 8.2 in RFC 1866.

Keywords : AXSDKWinInet MfcMisc kbprg

Technology : kbMfc

Version : winnt:1.0 4.2 5.0

Platform : NT WINDOWS

Issue type : kbhowto