fingerdlg.cpp

finger的查询功能 实现finger客户机。

	else
		 // It's an example case, so doesn't have a real threads handle
		dwStatus = !STILL_ACTIVE;

	if (dwStatus == STILL_ACTIVE)
	{
		// Perform thread termination, 
		// it automatically deletes threads object
		pFingerThread->Terminate();
	}
	else
	{
		// Delete threads object, since it persists on heap
		// if we don't call Terminate()
		delete pFingerThread;
	}

	// Delete threads item
	m_cInput.DeleteString(n);
}

void CFingerDlg::ShowResult()
{
	int n = m_iCurrentItem;
	
	// Save user input
	UpdateData();

	// Show selected item progress
	if( n ) 
	{
		// View specific thread

		// Get associated threads object
		CFingerThread *pFingerThread = static_cast<CFingerThread*>(m_cInput.GetItemDataPtr( n ));
		
		// Show threads progress
		m_sOutput = pFingerThread->Result();
	}
	else
		// View all threads

		m_sOutput = m_sResult;

	// Refresh back
	UpdateData(FALSE);
}

// Called from any spawned thread
//
void CFingerDlg::ProcessThread(void* pThread, const CString& sMsg, bool bState)
{
	// Enter critical section
	m_CritSection.Lock();
	
	// Update summary
	m_sResult.Insert(0,sMsg);
	
	// Update view if need
	if( m_iCurrentItem == 0 || 
		m_cInput.GetItemDataPtr( m_iCurrentItem ) == pThread )

		PostMessage( WM_THREAD_EVENT, 1 );

	// Leave critical section
	m_CritSection.Unlock();
}

// Called from any spawned thread
//
void CFingerDlg::ProcessThreadExit()
{
	PostMessage( WM_THREAD_EVENT );
}


LRESULT CFingerDlg::OnThreadEvent(WPARAM wParam, LPARAM lParam)
{
	if( wParam ) ShowResult();	// Update output
	else UpdateTitleDec();		// One thread terminated
	return 0;
}


void CFingerDlg::OnSelchangeCombo() 
{
	// Get selection
	int n = m_cInput.GetCurSel(); if( n == CB_ERR ) return;
	m_iCurrentItem = n;
	ShowResult();
}

// Button handlers
//
void CFingerDlg::OnAbout() 
{
	CAboutDlg dlgAbout;
	dlgAbout.DoModal();
}


void CFingerDlg::OnOptions() 
{
	// Get cursor position
	POINT pt;
	::GetCursorPos(&pt);
	// Track menu
	CMenu &menu = *m_cMenu.GetSubMenu(0);
	menu.TrackPopupMenu( TPM_LEFTALIGN |TPM_RIGHTBUTTON, pt.x, pt.y, this);
}


// Menu handlers
//
void CFingerDlg::OnOptionsViewSummary() 
{
	// Flip state
	m_bViewSummary = !m_bViewSummary;

	// Check/uncheck menu
	CMenu &menu = *m_cMenu.GetSubMenu(0);
	menu.CheckMenuItem( 0, MF_BYPOSITION |(m_bViewSummary ? MF_CHECKED : MF_UNCHECKED));

	// Test critical sections
#if 0
	static bool b = true;
	
	if( b )
	{
		// Suspend results output
		m_CritSection.Lock();
	}
	else
	{
		// Resume results output
		m_CritSection.Unlock();
	}

	b != b;
#endif
}

void CFingerDlg::OnOptionsCleanSummary() 
{
	// Enter critical section
	m_CritSection.Lock();
	
	// Clean summary
	m_sResult.Empty();
	m_sOutput.Empty();
	UpdateData(FALSE);

	// Leave critical section
	m_CritSection.Unlock();
}


void CFingerDlg::OnOptionsRefreshCurrent() 
{
	// Get user input
	CString sInput;
	m_cInput.GetWindowText(sInput);
	if( sInput.IsEmpty()) return;

	// Find that string
	int n = m_cInput.FindStringExact(1, sInput);

	// Nothing found
	if( n == CB_ERR )
	{
		if( AfxMessageBox( CString("There are no such query: '") + 
			sInput + "'. Submit?", MB_YESNO) == IDYES ) 
			Finger(sInput);
		return;
	}
	
	// If summary
	if( n == 0 )  // Show summary
	{
		m_iCurrentItem = 0;	ShowResult();
		return;
	}

	// Corresponding item's been found
	RemoveQuery(n);
	
	// Restart thread
	Finger(sInput);
}


void CFingerDlg::OnOptionsDeleteCurrent() 
{
	// Get user input
	CString sInput;
	m_cInput.GetWindowText(sInput);
	if( sInput.IsEmpty()) return;

	// Find that string
	int n = m_cInput.FindStringExact(1, sInput);

	// Nothing found
	if( n == CB_ERR )
	{
		AfxMessageBox( CString("There are no such query: '") + sInput + "'." );
		return;
	}
	
	// If summary
	if( n == 0 )
	{
		AfxMessageBox("Summary can't be deleted.");
		return;
	}

	// Corresponding item's been found
	RemoveQuery(n);
	
	// Set selection to summary
	m_cInput.SetCurSel(0);
	m_iCurrentItem = 0;
	ShowResult();
}


void CFingerDlg::OnOptionsDeleteAll() 
{
	if( AfxMessageBox( "Really cancel all queries?", MB_YESNO) == IDNO ) return;

	// It's important to go down, to escape mess
	for( int i = m_cInput.GetCount()-1; i > 0; i-- ) RemoveQuery(i);

	// Set selection to summary
	m_cInput.SetCurSel(0);
	m_iCurrentItem = 0;
	ShowResult();
}

void CFingerDlg::OnOptionsRefreshAll() 
{
	for( int i = 1; i < m_cInput.GetCount(); i++ )
	{
		// Get query string
		CString tmp;
		m_cInput.GetLBText( i, tmp );

		// Remove query
		RemoveQuery(i);
		
		// Submit it again
		Finger(tmp);
	}

	// Set selection to summary
	m_cInput.SetCurSel(0);
	m_iCurrentItem = 0;
	ShowResult();
}

void CFingerDlg::OnOptionsAbout() 
{
	OnAbout();
}

// Update title procedures
//
void CFingerDlg::UpdateTitleInc()
{
	// Increase threads count
	m_iActiveThreads++;
	
	// Update title
	CString str;
	str.Format("Finger - %d active queries", m_iActiveThreads );
	
	SetWindowText(str);
}

void CFingerDlg::UpdateTitleDec()
{
	// Decrease threads count
	m_iActiveThreads--;
	
	CString str;

	// Update title
	if( m_iActiveThreads )
		str.Format("Finger - %d active queries", m_iActiveThreads );
	else
		str = "Finger - waiting for a query";
	
	SetWindowText(str);
}

// Initialize static members
//
const CString CFingerDlg::ms_sExamples[] = 
{ 
	"@mit.edu",
	"[e-mail]"
};

// Verify if a request is from an examples list
// if so, execute it and invalidate as example,
// so it becomes an ordinary request

bool CFingerDlg::IsExample(const CString &sInput)
{
	static bool abExState[2] = { true, true };

	if(	abExState[0] && sInput == ms_sExamples[0] )
	{
		abExState[0] = false; // Not an example after we've tried it
		return true;
	}

	if(	abExState[1] && sInput == ms_sExamples[1] )
	{
		abExState[1] = false; // Not an example after we've tried it
		return true;
	}

	return false;
}


// Help handlers
//
void CFingerDlg::OnHelp() 
{
	const char *asLocations[] = { "finger.hlp", "hlp\\finger.hlp", "..\\hlp\\finger.hlp" };
	
	// Check possible locations of hlp file
	for( int i = 0; i < 3; i++ )

		if( ::GetFileAttributes( asLocations[i] ) != -1 ) break;
		
	// If failed to find file, invoke help anyway
	if( i >= 3 ) i = 0;

	// Invoke help
	::WinHelp( m_hWnd, asLocations[i], HELP_INDEX, 0 );
}


void CFingerDlg::OnOptionsHelp()
{
	OnHelp();
}