FTP Asynchronous Model test network State __FTP

To open the FTP test thread:

1, the thread declaration:

Static DWORD WINAPI Ftpcheckthread (LPVOID lpparam);

2, Thread Open:

CloseHandle (CreateThread (null,0,ftpcheckthread,this,0,null));

3. Thread implementation:

InternetOpen the last parameter is set to the asynchronous model.

DWORD WINAPI Cmainframe::ftpcheckthread (lpvoid lpparam) {cmainframe* pThis = (cmainframe*) Lpparam;

	CString Strip,strport,struser,strpassword;

	BOOL bsuccess = FALSE;
	Hinternet hinternet = NULL;

	Hinternet hftp = NULL;

	netinfo* pnetinfo = new NETINFO;

		if (pnetinfo!= null) {pnetinfo->m_hevent = CreateEvent (null, TRUE,//manual FALSE,//Initial no signal NULL);

		pnetinfo->m_bsuccess = FALSE;
	Pnetinfo->m_hhandle = NULL;
	} pthis->m_dlgbar.getdlgitemtext (Idc_ed_ip,strip);
	Pthis->m_dlgbar.getdlgitemtext (Idc_ed_port,strport);
	Pthis->m_dlgbar.getdlgitemtext (Idc_ed_user,struser);

	Pthis->m_dlgbar.getdlgitemtext (Idc_ed_password,strpassword);
			while (TRUE) {if (hinternet!= NULL) {internetclosehandle (hinternet);
			Sleep (200);						
		Hinternet = NULL;

		} hinternet = InternetOpen (Null,internet_open_type_preconfig,null,null,internet_flag_async); if (hinternet!= NULL) {internetsetstatuscallback (Hinternet,internetstatuscallback)//Set callback function if (hftp!= NULL) {internetclosehandle (HFTP);
				Sleep (500);
			Hftp = NULL;
			} tchar* Pwidechar = Strport.getbuffer (Strport.getlength ());
			char* Pchar = Widechartoansi (Pwidechar);

			Strport.releasebuffer (); Hftp = InternetConnect (Hinternet,strip,atoi (pchar), Struser,strpassword,internet_service_ftp,internet_flag_

			Passive, (DWORD_PTR) pnetinfo); if (Hftp && GetLastError ()!= error_io_pending) {//pthis->messagebox (_t) ("The first connection succeeds.")
				"));
				Gstrnetworkmsg = _t ("Network connection Successful!");
				
			::P ostmessage (pthis->m_hwnd,wm_netstatemsg,0,0); }else{if (WaitForSingleObject (pnetinfo->m_hevent,10000) = = wait_object_0) {resetevent (pNetInfo->m_hEv

					ENT);
					Hftp = pnetinfo->m_hhandle;
				Pnetinfo->m_hhandle = NULL;
					} if (hftp = = NULL) {//network connection failed, attempting to reconnect gstrnetworkmsg = _t ("Network connection failed, trying to reconnect ...");
				::P ostmessage (pthis->m_hwnd,wm_netstatemsg,0,0); } else {//network connection succeeded ...。
					Gstrnetworkmsg = _t ("Network connection Successful!");

					::P ostmessage (pthis->m_hwnd,wm_netstatemsg,0,0);

					Sleep (1000);
					bsuccess = Ftpcommadcheck (Hftp,pnetinfo);
						if (bsuccess) {//network OK gstrnetworkmsg = _t ("Network ok!");
					::P ostmessage (pthis->m_hwnd,wm_netstatemsg,0,0);
						else {//network Error gstrnetworkmsg = _t ("Network error!");
					::P ostmessage (pthis->m_hwnd,wm_netstatemsg,0,0);
			} sleep (1000);
			} delete[] Pchar; //......
		}
		Else{Sleep (1000);
	Sleep (10000);
return 1; }

Where: Ftpcheckthread () functions involved in the implementation of several functions are as follows:

1 the Declaration and implementation of the callback function:

void CALLBACK Internetstatuscallback (
	hinternet hinternet,
	dword_ptr dwcontext,
	DWORD dwinternetstatus,
	lpvoid Lpvstatusinformation,
	DWORD dwstatusinformationlength
	);

void CALLBACK Internetstatuscallback (
	hinternet hinternet,
	dword_ptr dwcontext,
	DWORD dwinternetstatus,
	lpvoid Lpvstatusinformation,
	DWORD dwstatusinformationlength)
{
	if (dwinternetstatus = = Internet_status_request_complete)
	{
		Internet_async_result *result = (internet_async_result*) lpvstatusinformation;
		if (Result->dwerror = = ERROR_SUCCESS)
		{
			(netinfo*) dwcontext)->m_hhandle = (hinternet) result-> Dwresult;
			((netinfo*) dwcontext)->m_bsuccess = (BOOL) result->dwresult;
			SetEvent (((netinfo*) dwcontext)->m_hevent);}}

2) Implementation of Widechartoansi:

Char *widechartoansi (wchar_t *pwidechar)  
{  
	if (!pwidechar) return NULL;  
	char *pszbuf = NULL;  
	int needbytes = WideCharToMultiByte (CP_ACP, 0, Pwidechar,-1, NULL, 0, NULL, NULL);  
	if (Needbytes > 0) {  
		pszbuf = new char[needbytes+1];  
		ZeroMemory (Pszbuf, (needbytes+1) *sizeof (char));  
		WideCharToMultiByte (CP_ACP, 0, Pwidechar,-1, pszbuf, needbytes, NULL, NULL);  

	return pszbuf;  
}

3) The implementation of the Ftpcommadcheck function:

BOOL Ftpcommadcheck (hinternet hftp, netinfo* pnetinfo)//test FTP connection
{
	CString sTmp;
	BOOL success = FALSE;
	Success = FtpCommand (Hftp, FALSE, Ftp_transfer_type_binary, _t ("NOOP"), (DWORD) pnetinfo, NULL);
	if (!success)
	{
		if (WaitForSingleObject (pnetinfo->m_hevent,1000) = = Wait_object_0)
		{
			resetevent (pnetinfo->m_hevent);
			Success = pnetinfo->m_bsuccess;
			pnetinfo->m_bsuccess = FALSE;
		}
		Else
		{
			success = FALSE;
		}	
	}

	return success;
}

4) Definition of NetInfo structure:

typedef struct TAGNETINFO 
{
	hinternet m_hhandle;
	BOOL m_bsuccess;
	HANDLE m_hevent;
	Tagnetinfo ()
	{
		M_hhandle  = NULL;
		m_bsuccess = FALSE;
		M_hevent   = NULL;
	}

} NETINFO;