[phil-story] Always Fighting 

WinCE 에서는 MFC에서 사용되던 Class중 드랍된 Class가 많다.. 본인이 FTP관련된 Class 2가지를 사용해보려고 했으나.. 두 Class 모두 드랍된 List에 포함되있었고.. 결국 HTTP와 FTP를 사용하기위해 WinInet을 사용하기로 했다..

아래는 MFC에서 사용하는 Class중 WinCE에서 변경 및 삭제된 Class의 목록이다..

WinInet HTTP APIs

Here is WinInet HTTP APIs hierarchy. To use an Http API, you have to go through the heirarchy. 



Before using any HTTP functions, you must be aware of InternetConnect funtion. Here is syntax for InternetConnect.

HINTERNET InternetConnect(IN HINTERNET hInternetSession, IN LPCSTR lpszServerName, IN INTERNET_PORT nServerPort, IN LPCSTR lpszUsername, IN LPCSTR lpszPassword, IN DWORD dwService, IN DWORD dwFlags, IN DWORD dwContext );

Where hInternetSession is handle retured by InternetOpen. Parameter lpszServerName is name of the server (a host name or host IP). The next parameter, nServerPort allows you to specify a port number. Here are default values for this parameter:

Parameter lpszUsername and lpszPassword are UserID and passwords. Next parameter, dwService has three values:

Here is an example:

HINTERNET hConnection = InternetConnect( hSession, "

www.dotnetheaven.com", INTERNET_DEFAULT_HTTP_POST, NULL, NULL, INTERNET_SERVICE_HTTP, 0, 0 );

Here is a list of HTTP APIs:

HttpOpenRequest

This is the first HTTP function, which should be called after InternetConnect. To open an HTTP connection, InternetConnect must pass its third parameter value as INTERNET_DEFAULT_HTTP_PORT. This function sends a request to get or retrieve data depends on the method. Here is syntax:

HINTERNET HttpOpenRequest(IN HINTERNET hHttpSession,IN LPCSTR lpszVerb,    IN LPCSTR lpszObjectName,IN LPCSTR lpszVersion,IN LPCSTR lpszReferer,    IN LPCSTR FAR * lpszAcceptTypes,IN DWORD dwFlags,IN DWORD dwContext);

First line of every HTTP request is a combination of three elements: Method, URI, and Protocol Version. Three parameters lpszVerb, lpszObjectName, and lpszVersion of HttpOpenRequest make first line of HTTP request.

Here is how to use this function:

HINTERNET hRequest = HttpOpenRequest( hConnection, "GET", "", NULL, NULL, INTERNET_FLAG_RELOAD, 0  );

We will see all the APIs in out example. For more details, you can see MSDN.

HttpSendRequest

Another important HTTP function is HttpSendRequest. This function actually sends a request to Http server. This request may be to post or to get data from the server. It depends on the HttpOpenRequest handle.

Syntax:

BOOL HttpSendRequest( IN HINTERNET hHttpRequest, IN LPCSTR lpszHeaders,    IN DWORD dwHeadersLength, IN LPVOID lpOptional, DWORD dwOptionalLength);

Here is how to use this function:

HttpSendRequest( hData, NULL, 0, NULL, 0);

Example: Now let's see how to use all these functions in our example. This example shows how to download contents of a page using HTTP API functions.

HINTERNET hINet, hConnection, hData;
CHAR buffer[2048] ;
CString m_strContents ;
DWORD dwRead, dwFlags, dwStatus ;
hINet = InternetOpen("InetURL/1.0", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0 );
if ( !hINet )
{
AfxMessageBox("InternetOpen Failed");
return;
}
try
{
hConnection = InternetConnect( hINet, "

www.dotnetheaven.com", 80, " "," ", INTERNET_SERVICE_HTTP, 0, 0 );
if ( !hConnection )
{
InternetCloseHandle(hINet);
return;
}
// Get datahData = HttpOpenRequest( hConnection, "GET", "/uicsa/index.htm", NULL, NULL, NULL, INTERNET_FLAG_KEEP_CONNECTION, 0 );
if ( !hData )
{
InternetCloseHandle(hConnection);
InternetCloseHandle(hINet);
return;
}
HttpSendRequest( hData, NULL, 0, NULL, 0);
while( InternetReadFile( hData, buffer, 255, &dwRead ) )
{
if ( dwRead == 0 )
return;
buffer[dwRead] = 0;
m_strContents += buffer;
}
}
catch( CInternetException* e)
{
e->ReportError();
e->Delete();
}
InternetCloseHandle(hConnection);InternetCloseHandle(hINet);
InternetCloseHandle(hData);

HttpAddRequestHeaders

You can add, replace or remove headers to your HTTP request by using this function. Add, replace, or remove depends on dwModifiers parameter. Ok, here is the syntax:

BOOL HttpAddRequestHeaders( IN HINTERNET hHttpRequest, IN LPCSTR lpszHeaders,    IN DWORD dwHeadersLength,  IN DWORD dwModifiers);

Ok, here is an example:

char* chHead = "Accept: image/*\r\n" ; HttpAddRequestHeaders( hHttpHandle, chHead, -1, HTTP_ADDREQ_FLAG_ADD);

HttpQueryInfo

This function allows you to retrieve information about a give HTTP request. Here is the syntax:

BOOL HttpQueryInfo(IN HINTERNET hHttpRequest, IN DWORD dwInfoLevel,    IN LPVOID lpvBuffer,  IN LPDWORD lpdwBufferLength,IN OUT LPDWORD lpdwIndex);

Ok, here is an example:

CHAR chBuff[1024];DWORD dwLen 1024;BOOL bRet;bRet = HttpQueryInfo( hRequest, HTTP_QUERY_CUSTOM, chBuff, &dwLen, NULL);
 
WinInet FTP APIs

Here is a list of ftp functions. All FTP functions are easy to understand and use. There is nothing to explain. I have sample examples for most of the functions.

FtpCreateDirectory

This function creates a directory on the FTP server.

Syntax:

BOOL FtpCreateDirectory(IN HINTERNET hConnect, IN LPCTSTR lpszDirectory );

Sample:

if (!FtpCreateDirectory(g_hConnection, "NewDir"))
DoSomething();