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windows-nt/Source/XPSP1/NT/shell/ext/webcheck/dialmon.cpp

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2020-09-26 03:20:57 -05:00
//*********************************************************************
//* Microsoft Windows **
//* Copyright(c) Microsoft Corp., 1995 **
//*********************************************************************
//
// DIALMON.C - Window proc for dial monitor app
//
// HISTORY:
//
// 4/18/95 jeremys Created.
//
#include "private.h"
#include <mluisupp.h>
#define TF_THISMODULE TF_DIALMON
//
// Registry keys we use to get autodial information
//
// Internet connection goes in remote access key
const TCHAR c_szRASKey[] = TEXT("RemoteAccess");
// Key name
const TCHAR c_szProfile[] = TEXT("InternetProfile");
const TCHAR c_szEnable[] = TEXT("EnableUnattended");
// registry keys of interest
const TCHAR c_szRegPathInternetSettings[] = REGSTR_PATH_INTERNET_SETTINGS;
static const TCHAR szRegValEnableAutoDisconnect[] = REGSTR_VAL_ENABLEAUTODISCONNECT;
static const TCHAR szRegValDisconnectIdleTime[] = REGSTR_VAL_DISCONNECTIDLETIME;
static const TCHAR szRegValExitDisconnect[] = REGSTR_VAL_ENABLEEXITDISCONNECT;
static const TCHAR szEllipsis[] = TEXT("...");
static const CHAR szDashes[] = "----";
static const TCHAR szAutodialMonitorClass[] = REGSTR_VAL_AUTODIAL_MONITORCLASSNAME;
static const TCHAR c_szDialmonClass[] = TEXT("MS_WebcheckMonitor");
// Dialmon globals
UINT_PTR g_uDialmonSecTimerID = 0;
CDialMon * g_pDialMon = NULL;
// Function prototypes for dialog handling functions
INT_PTR CALLBACK DisconnectPromptDlgProc(HWND hDlg, UINT uMsg, WPARAM wParam,
LPARAM lParam);
BOOL DisconnectDlgInit(HWND hDlg,DISCONNECTDLGINFO * pDisconnectDlgInfo);
VOID DisconnectDlgCancel(HWND hDlg);
VOID DisconnectDlgTimerProc(HWND hDlg);
VOID DisconnectDlgDisableAutodisconnect(HWND hDlg);
VOID DisconnectDlgShowCountdown(HWND hDlg,DWORD dwSecsRemaining);
VOID EnableDisconnectDlgCtrls(HWND hDlg,BOOL fEnable);
BOOL CenterWindow (HWND hwndChild, HWND hwndParent);
////////////////////////////////////////////////////////////////////////
// RAS delay load helpers
//
typedef DWORD (WINAPI* _RASSETAUTODIALPARAM) (
DWORD, LPVOID, DWORD
);
typedef DWORD (WINAPI* _RASENUMCONNECTIONSA) (
LPRASCONNA, LPDWORD, LPDWORD
);
typedef DWORD (WINAPI* _RASENUMCONNECTIONSW) (
LPRASCONNW, LPDWORD, LPDWORD
);
typedef DWORD (WINAPI* _RASHANGUP) (
HRASCONN
);
typedef struct _tagAPIMAPENTRY {
FARPROC* pfn;
LPSTR pszProc;
} APIMAPENTRY;
static _RASSETAUTODIALPARAM pfnRasSetAutodialParam = NULL;
static _RASENUMCONNECTIONSA pfnRasEnumConnectionsA = NULL;
static _RASENUMCONNECTIONSW pfnRasEnumConnectionsW = NULL;
static _RASHANGUP pfnRasHangUp = NULL;
static HINSTANCE g_hRasLib = NULL;
static long g_lRasRefCnt = 0;
APIMAPENTRY rgRasApiMap[] = {
{ (FARPROC*) &pfnRasSetAutodialParam, "RasSetAutodialParamA" },
{ (FARPROC*) &pfnRasEnumConnectionsA, "RasEnumConnectionsA" },
{ (FARPROC*) &pfnRasEnumConnectionsW, "RasEnumConnectionsW" },
{ (FARPROC*) &pfnRasHangUp, "RasHangUpA" },
{ NULL, NULL },
};
/////////////////////////////////////////////////////////////////////////////
//
// RasEnumHelp
//
// Abstract grusome details of getting a correct enumeration of connections
// from RAS. Works on all 9x and NT platforms correctly, maintaining unicode
// whenever possible.
//
/////////////////////////////////////////////////////////////////////////////
class RasEnumHelp
{
private:
//
// Possible ways we got info from RAS
//
typedef enum {
ENUM_MULTIBYTE, // Win9x
ENUM_UNICODE, // NT
} ENUM_TYPE;
//
// How we got the info
//
ENUM_TYPE _EnumType;
//
// Any error we got during enumeration
//
DWORD _dwLastError;
//
// Number of entries we got
//
DWORD _dwEntries;
//
// Pointer to info retrieved from RAS
//
RASCONNW * _rcList;
//
// Last entry returned as multibyte or unicode when conversion required
//
RASCONNW _rcCurrentEntryW;
public:
RasEnumHelp();
~RasEnumHelp();
DWORD GetError();
DWORD GetEntryCount();
LPRASCONNW GetEntryW(DWORD dwEntry);
};
RasEnumHelp::RasEnumHelp()
{
DWORD dwBufSize, dwStructSize;
// init
_dwEntries = 0;
_dwLastError = 0;
// figure out which kind of enumeration we're doing - start with multibyte
_EnumType = ENUM_MULTIBYTE;
dwStructSize = sizeof(RASCONNA);
if (g_fIsWinNT)
{
_EnumType = ENUM_UNICODE;
dwStructSize = sizeof(RASCONNW);
}
// allocate space for 16 entries
dwBufSize = 16 * dwStructSize;
_rcList = (LPRASCONNW)LocalAlloc(LMEM_FIXED, dwBufSize);
if(_rcList)
{
do
{
// set up list
_rcList[0].dwSize = dwStructSize;
// call ras to enumerate
_dwLastError = ERROR_UNKNOWN;
if(ENUM_MULTIBYTE == _EnumType)
{
if(pfnRasEnumConnectionsA)
{
_dwLastError = pfnRasEnumConnectionsA(
(LPRASCONNA)_rcList,
&dwBufSize,
&_dwEntries
);
}
}
else
{
if(pfnRasEnumConnectionsW)
{
_dwLastError = pfnRasEnumConnectionsW(
_rcList,
&dwBufSize,
&_dwEntries
);
}
}
// reallocate buffer if necessary
if(ERROR_BUFFER_TOO_SMALL == _dwLastError)
{
LocalFree(_rcList);
_rcList = (LPRASCONNW)LocalAlloc(LMEM_FIXED, dwBufSize);
if(NULL == _rcList)
{
_dwLastError = ERROR_NOT_ENOUGH_MEMORY;
break;
}
}
else
{
break;
}
} while(TRUE);
}
else
{
_dwLastError = ERROR_NOT_ENOUGH_MEMORY;
}
if(_rcList && (ERROR_SUCCESS != _dwLastError))
{
LocalFree(_rcList);
_rcList = NULL;
_dwEntries = 0;
}
return;
}
RasEnumHelp::~RasEnumHelp()
{
if(_rcList)
{
LocalFree(_rcList);
}
}
DWORD
RasEnumHelp::GetError()
{
return _dwLastError;
}
DWORD
RasEnumHelp::GetEntryCount()
{
return _dwEntries;
}
LPRASCONNW
RasEnumHelp::GetEntryW(DWORD dwEntryNum)
{
LPRASCONNW prc = NULL;
if(dwEntryNum < _dwEntries)
{
_rcCurrentEntryW.hrasconn = _rcList[dwEntryNum].hrasconn;
switch(_EnumType)
{
case ENUM_MULTIBYTE:
{
MultiByteToWideChar(CP_ACP, 0,
((LPRASCONNA)_rcList)[dwEntryNum].szEntryName,
-1, _rcCurrentEntryW.szEntryName,
ARRAYSIZE(_rcCurrentEntryW.szEntryName));
}
break;
case ENUM_UNICODE:
{
StrCpyNW(_rcCurrentEntryW.szEntryName,
_rcList[dwEntryNum].szEntryName,
ARRAYSIZE(_rcCurrentEntryW.szEntryName));
}
break;
}
prc = &_rcCurrentEntryW;
}
return prc;
}
//
// Functions we can call once ras is loaded
//
DWORD _RasSetAutodialParam(DWORD dwKey, LPVOID lpvValue, DWORD dwcbValue)
{
if (pfnRasSetAutodialParam == NULL)
return ERROR_UNKNOWN;
return (*pfnRasSetAutodialParam)(dwKey, lpvValue, dwcbValue);
}
DWORD _RasEnumConnections(LPRASCONNW lpRasConn, LPDWORD lpdwSize, LPDWORD lpdwConn)
{
RasEnumHelp reh;
DWORD dwRet = reh.GetError();
if (ERROR_SUCCESS == dwRet)
{
DWORD cItems = reh.GetEntryCount();
DWORD cbNeeded = cItems * sizeof(RASCONNW);
*lpdwConn = 0;
if (*lpdwSize >= cbNeeded)
{
*lpdwConn = cItems;
DWORD dw;
for (dw = 0; dw < cItems; dw++)
{
LPRASCONNW prc = reh.GetEntryW(dw);
ASSERT(prc != NULL);
lpRasConn[dw].hrasconn = prc->hrasconn;
StrCpyNW(lpRasConn[dw].szEntryName,
prc->szEntryName,
ARRAYSIZE(lpRasConn[dw].szEntryName));
}
}
else
{
dwRet = ERROR_BUFFER_TOO_SMALL;
}
*lpdwSize = cbNeeded;
}
return dwRet;
}
DWORD _RasHangUp(HRASCONN hRasConn)
{
if (pfnRasHangUp == NULL)
return ERROR_UNKNOWN;
return (*pfnRasHangUp)(hRasConn);
}
BOOL
LoadRasDll(void)
{
if(NULL == g_hRasLib) {
g_hRasLib = LoadLibrary(TEXT("RASAPI32.DLL"));
if(NULL == g_hRasLib)
return FALSE;
int nIndex = 0;
while (rgRasApiMap[nIndex].pszProc != NULL) {
*rgRasApiMap[nIndex].pfn =
GetProcAddress(g_hRasLib, rgRasApiMap[nIndex].pszProc);
// GetProcAddress will fail on Win95 for a couple of NT only apis.
// ASSERT(*rgRasApiMap[nIndex].pfn != NULL);
nIndex++;
}
}
if(g_hRasLib) {
return TRUE;
}
return FALSE;
}
void
UnloadRasDll(void)
{
if(g_hRasLib) {
FreeLibrary(g_hRasLib);
g_hRasLib = NULL;
int nIndex = 0;
while (rgRasApiMap[nIndex].pszProc != NULL) {
*rgRasApiMap[nIndex].pfn = NULL;
nIndex++;
}
}
}
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
//
// CDialmonClients
//
// Class to maintain a list of application Windows using Dialmon.
// Used for auto-timeout for all these applications.
// This class supports
// adding hooks to incoming applications,
// removing hooks for exiting applications,
// some aggregate operations on all clients.
//
// This is a singleton class, and needs to support only serialized access
// because all access is thru Dialmon which has a serialized message queue.
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
class CDialmonClients
{
private:
HWND pHwndArray[MAX_DIALMON_HANDLES];
int cCount;
static CDialmonClients* pSingleton;
public:
CDialmonClients();
~CDialmonClients(){}
static CDialmonClients* getSingleton()
{
if( NULL == pSingleton )
return ( pSingleton = new CDialmonClients() );
else
return pSingleton;
}
static void Shutdown()
{
if( pSingleton )
delete pSingleton;
}
void ClearAll(void);
BOOL AddHook( HWND hWnd );
BOOL RemoveHook( HWND hWnd );
BOOL HasEntries() { return (cCount != 0); };
friend void BroadcastCanHangup( int iTimeoutMins );
friend void BroadcastHangingUp( void );
friend void OnConfirmHangup( HWND hWnd );
friend void OnDenyHangup( HWND hWnd, CDialMon* pDialMon );
friend BOOL CanHangup( void ); //doesn't have to be a friend - just bunched it together for now.
void DebugPrint( void );
};
CDialmonClients* CDialmonClients::pSingleton;
CDialmonClients::CDialmonClients():cCount(0)
{
for( int i=0; i<MAX_DIALMON_HANDLES; i++ )
pHwndArray[i] = NULL;
}
void CDialmonClients::ClearAll(void)
{
for( int i=0; i<MAX_DIALMON_HANDLES; i++ )
pHwndArray[i] = NULL;
}
// client app. passes a handle to its messaging window when it starts up.
BOOL CDialmonClients::AddHook( HWND hWnd )
{
DebugMsg( DM_TRACE, TEXT("\tCDIALMONCLIENTS: Add Hook\n") );
if( cCount >= MAX_DIALMON_HANDLES )
return false; /* BAD! */
pHwndArray[cCount++] = hWnd;
#ifdef DEBUG
DebugPrint();
#endif
return true;
}
// client app. unhooks the handle from the CDialmonClients.
//IMPL: cCount always points to the next empty entry in the array.
// so when we delete a handle, we move all the entries beyond that
// handle up one place and decrement cCount.
BOOL CDialmonClients::RemoveHook( HWND hWnd )
{
DebugMsg( DM_TRACE, TEXT("\tCDIALMONCLIENTS: Remove Hook\n") );
boolean found = false;
int i;
for( i=0; i<cCount; i++ )
{
if( hWnd == pHwndArray[i] )
{
pHwndArray[i] = NULL;
--cCount;
found = true;
break;
}
}
// move everything beyong cCount up by 1
// so that cCount represents next free index to
// insert into.
if( found )
{
for( ; i<cCount; i++ )
pHwndArray[i] = pHwndArray[i+1];
pHwndArray[cCount] = NULL;
}
#ifdef DEBUG
DebugPrint();
#endif
return found;
}
void CDialmonClients::DebugPrint(void)
{
DebugMsg( DM_TRACE, TEXT("\tCDIALMONCLIENTS: ClientList->\n") );
for( int i=0; i<cCount; i++ )
{
if( pHwndArray[i] )
{
DebugMsg( DM_TRACE, TEXT("\t\t%d: %x\n"), i, pHwndArray[i] );
}
}
}
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
//
// Start up and Shutdown CDialmonClients
//
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
CDialmonClients* g_pDialmonClients;
static void DialmonClientsInit(void)
{
g_pDialmonClients = new CDialmonClients();
}
static void DialmonClientsShutdown(void)
{
delete g_pDialmonClients;
}
//#define USE_CONFIRM_ARRAY 1
// We don't need to use the pConfirmHangupArray.
// The option is to simply wait for some preset time, and if no registered
// client refuses the hangup option, to go ahead and simply hangup.
// This array lets us hangup a little earlier just in case all clients reply
// immdly.
#ifdef USE_CONFIRM_ARRAY
static BOOL pConfirmHangupArray[MAX_DIALMON_HANDLES];
#endif
static int cOutstandingReplies = 0;
// Broadcast to all registered client a query of can_hang_up?
void BroadcastCanHangup( int iTimeoutMins )
{
DebugMsg( DM_TRACE, TEXT("\tCDIALMONCLIENTS: Broadcasting WM_CANHANGUP?") );
int i;
cOutstandingReplies=0;
for( i=0; i<g_pDialmonClients->cCount; i++ )
{
if(PostMessage( g_pDialmonClients->pHwndArray[i], WM_CANHANGUP,
0, (LPARAM)iTimeoutMins ))
++cOutstandingReplies;
}
// if we are using a confirm boolean array, then set ALL
// entries to false.. this is to take care of any clients that come
// in AFTER we broadcast can hangup and BEFORE all the existing clients
// have finished confirming.
#ifdef USE_CONFIRM_ARRAY
for( i=0; i<MAX_DIALMON_HANDLES; i++ )
{
pConfirmHangupArray[i] = false;
}
#endif
}
// This is a broadcast AFTER hangingup to all registered clients.
void BroadcastHangingUp(void)
{
DebugMsg( DM_TRACE, TEXT("\tCDIALMONCLIENTS: Broadcasting WM_HANGING_UP") );
for( int i=0; i<g_pDialmonClients->cCount; i++ )
PostMessage( g_pDialmonClients->pHwndArray[i], WM_HANGING_UP, 0,0 );
}
// Record that this particular client would like to hangup.
void OnConfirmHangup( HWND hWnd )
{
#ifdef USE_CONFIRM_ARRAY
for( int i=0; i<g_pDialmonClients->cCount; i++ )
if( hWnd == g_pDialmonClients->pHwndArray[i] )
{
pConfirmHangupArray[i] = true;
break;
}
#endif
--cOutstandingReplies;
}
// Checks if all clients have replied positively.
// Returns false if any client has not yet replied.
BOOL CanHangup( void )
{
#ifdef USE_CONFIRM_ARRAY
for( int i=0; i<g_pDialmonClients->cCount; i++ )
if( false == pConfirmHangupArray[i] )
return false;
return true;
#else
return (cOutstandingReplies==0);
#endif
}
// take action to abort hangup, ( set CDialmon::_dwElapsedTicks to 0 ).
// The effect of this would be that after another timeout period, dialmon
// would again query all the clients.
// However, the client does not have to bring up a dialog again if the user
// indicates that he is not interested in the feature.. the client can
// negate the hangup without interrupting the user.
// ( see the auto-disconnect feature in dialmon ).
void OnDenyHangup( HWND hWnd, CDialMon* pDialMon )
{
#ifdef USE_CONFIRM_ARRAY
for( int i=0; i<g_pDialmonClients->cCount; i++ )
if( hWnd == g_pDialmonClients->pHwndArray[i] )
{
pConfirmHangupArray[i] = false;
break;
}
#endif
pDialMon->ResetElapsedTicks();
cOutstandingReplies=0;
}
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
//
// Helper to tell dialmon something is going on
//
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
void IndicateDialmonActivity(void)
{
static HWND hwndDialmon = NULL;
HWND hwndMonitor;
// this one is dynamic - have to find window every time
hwndMonitor = FindWindow(szAutodialMonitorClass, NULL);
if(hwndMonitor)
PostMessage(hwndMonitor, WM_WINSOCK_ACTIVITY, 0, 0);
// dialmon lives forever - find it once and we're set
if(NULL == hwndDialmon)
hwndDialmon = FindWindow(c_szDialmonClass, NULL);
if(hwndDialmon)
PostMessage(hwndDialmon, WM_WINSOCK_ACTIVITY, 0, 0);
}
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
//
// Dialmon startup and shutdown
//
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
BOOL DialmonInit(void)
{
g_pDialMon = new CDialMon;
DialmonClientsInit();
if(g_pDialMon)
return TRUE;
return FALSE;
}
void DialmonShutdown(void)
{
DialmonClientsShutdown();
SAFEDELETE(g_pDialMon);
}
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
//
// Dialmon window functions
//
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
// this cwebcheck instance is in iwebck.cpp
extern CWebCheck *g_pwc;
#ifdef DEBUG_KV
// DEBUG_KV is set to 1 if you need to test hangup logic
// without actually having a dailup connection.
static bool kvhack = true;
#endif
LRESULT CALLBACK Dialmon_WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
CDialMon *pDialMon = (CDialMon*) GetWindowLongPtr(hwnd, GWLP_USERDATA);
switch (uMsg)
{
case WM_CREATE:
{
// snag our class pointer and save in window data
CREATESTRUCT *pcs;
pcs = (CREATESTRUCT *)lParam;
SetWindowLongPtr(hwnd, GWLP_USERDATA, (LONG_PTR) pcs->lpCreateParams);
break;
}
// DialMon messages (starting at WM_USER+100)
case WM_SET_CONNECTOID_NAME:
if(pDialMon)
pDialMon->OnSetConnectoid(wParam!=0);
break;
case WM_WINSOCK_ACTIVITY:
if(pDialMon)
pDialMon->OnActivity();
break;
case WM_IEXPLORER_EXITING:
if(pDialMon)
pDialMon->OnExplorerExit();
break;
case WM_DIALMON_HOOK:
DebugMsg( DM_TRACE, TEXT("\tCDIALMONCLIENTS: WM_HOOK recd. from Window 0x%x"), lParam );
BOOL fRetval;
fRetval = g_pDialmonClients->AddHook( (HWND)lParam );
ASSERT( fRetval == TRUE );
#ifdef DEBUG_KV
if( kvhack == true )
{
pDialMon->kvStartMonitoring();
kvhack = false;
}
#endif
break;
case WM_DIALMON_UNHOOK:
DebugMsg( DM_TRACE, TEXT("\tCDIALMONCLIENTS: WM_UNHOOK recd. from Window 0x%x"), lParam );
g_pDialmonClients->RemoveHook( (HWND)lParam );
break;
case WM_CONFIRM_HANGUP:
DebugMsg( DM_TRACE, TEXT("\tCDIALMONCLIENTS: WM_CONFIRM_HANGUP recd. from Window 0x%x"), lParam );
OnConfirmHangup( (HWND)lParam );
break;
case WM_DENY_HANGUP:
DebugMsg( DM_TRACE, TEXT("\tCDIALMONCLIENTS: WM_DENY_HANGUP recd. from Window 0x%x"), lParam );
OnDenyHangup( (HWND)lParam, pDialMon );
break;
case WM_TIMER:
if(pDialMon)
pDialMon->OnTimer(wParam);
break;
case WM_LOAD_SENSLCE:
DBG("Dialmon_WndProc - got WM_LOAD_SENSLCE");
if(g_pwc)
{
g_pwc->LoadExternals();
}
break;
case WM_IS_SENSLCE_LOADED:
if(g_pwc)
{
return g_pwc->AreExternalsLoaded();
}
else
{
return FALSE;
}
break;
case WM_WININICHANGE:
if (lParam && !StrCmpI((LPCTSTR)lParam, TEXT("policy")))
{
ProcessInfodeliveryPolicies();
}
// FEATURE: This should be done on Policy and another filter, not for
// all changes. (The other filter hasn't been defined yet.)
// TODO: handle this in the new architecture!
//SetNotificationMgrRestrictions(NULL);
break;
}
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
//
// CDialMon class implementation
//
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
//
// Constructor / Destructor
//
CDialMon::CDialMon()
{
WNDCLASS wc;
// register dialmon window class
memset(&wc, 0, sizeof(wc));
wc.lpfnWndProc = Dialmon_WndProc;
wc.hInstance = g_hInst;
wc.lpszClassName = c_szDialmonClass;
RegisterClass(&wc);
// create dialmon window
_hwndDialmon = CreateWindow(c_szDialmonClass,
c_szDialmonClass,
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
g_hInst,
(LPVOID)this);
}
CDialMon::~CDialMon()
{
if(_hwndDialmon)
DestroyWindow(_hwndDialmon);
// unload ras if it's still around
UnloadRasDll();
}
///////////////////////////////////////////////////////////////////////////
//
// Start/StopMonitoring
//
///////////////////////////////////////////////////////////////////////////
BOOL CDialMon::StartMonitoring(void)
{
DBG("CDialMon::StartMonitoring");
// read timeout settings from registry
RefreshTimeoutSettings();
// set a one-minute timer
StopIdleTimer();
if(!StartIdleTimer())
return FALSE;
_dwElapsedTicks = 0;
return TRUE;
}
void CDialMon::StopMonitoring(void)
{
DBG("CDialMon::StopMonitoring");
// don't ever hang up now but keep an eye on ras connection
_dwTimeoutMins = 0;
_fDisconnectOnExit = FALSE;
}
///////////////////////////////////////////////////////////////////////////
//
// Start/StopIdleTimer, OnTimer
//
///////////////////////////////////////////////////////////////////////////
INT_PTR CDialMon::StartIdleTimer(void)
{
if(0 == _uIdleTimerID)
_uIdleTimerID = SetTimer(_hwndDialmon, TIMER_ID_DIALMON_IDLE, 30000, NULL);
ASSERT(_uIdleTimerID);
return _uIdleTimerID;
}
void CDialMon::StopIdleTimer(void)
{
if(_uIdleTimerID) {
KillTimer(_hwndDialmon, _uIdleTimerID);
_uIdleTimerID = 0;
}
}
void CDialMon::OnTimer(UINT_PTR uTimerID)
{
DBG("CDialMon::OnMonitorTimer");
// if we're on Millennium, just bail out. The system handles idle disconnect.
if(g_fIsMillennium)
{
return;
}
// if it's not our timer, ignore it
if(uTimerID != _uIdleTimerID)
return;
// prevent re-entrancy of timer proc (we can stay in here indefinitely
// since we may bring up a dialog box)
if (_fInDisconnectFunction) {
// disconnect dialog already launched, ignore timer ticks while
// it's present
return;
}
_fInDisconnectFunction = TRUE;
CheckForDisconnect(TRUE);
_fInDisconnectFunction = FALSE;
#ifdef DEBUG_KV
/* Don't stop idle timer */
#else
if(FALSE == _fConnected) {
StopIdleTimer();
}
#endif
}
///////////////////////////////////////////////////////////////////////////
//
// OnSetConnectoid/OnActivity/OnExplorerExit
//
///////////////////////////////////////////////////////////////////////////
void CDialMon::OnSetConnectoid(BOOL fNoTimeout)
{
RASCONN RasCon[MAX_CONNECTION];
DWORD dwBytes, dwRes, dwConnections;
// save no timeout setting
_fNoTimeout = fNoTimeout;
// Ask ras which connectoid is connected and watch that one
LoadRasDll();
RasCon[0].dwSize = sizeof(RasCon[0]);
dwBytes = MAX_CONNECTION * sizeof(RasCon[0]);
dwRes = _RasEnumConnections(RasCon, &dwBytes, &dwConnections);
// No connections? bail.
if(0 == dwConnections) {
*_pszConnectoidName = TEXT('\0');
_fConnected = FALSE;
return;
}
// Monitor first connectoid
StrCpyN(_pszConnectoidName, RasCon[0].szEntryName, ARRAYSIZE(_pszConnectoidName));
// send ras connect notification if we weren't previously connected
if(FALSE == _fConnected) {
_fConnected = TRUE;
}
// start watching it
StartMonitoring();
}
void CDialMon::OnActivity(void)
{
DBG("CDialMon::OnActivity");
// reset idle tick count
_dwElapsedTicks = 0;
// if the disconnect dialog is present and winsock activity
// resumes, then dismiss the dialog
if(_hDisconnectDlg) {
SendMessage(_hDisconnectDlg, WM_QUIT_DISCONNECT_DLG, 0, 0);
_hDisconnectDlg = NULL;
}
}
void CDialMon::OnExplorerExit()
{
DBG("CDialMon::OnIExplorerExit");
if(FALSE == _fDisconnectOnExit && FALSE == _fNoTimeout) {
// no exit disconnection so bail
DBG("CDialMon::OnIExplorerExit - exit hangup not enabled");
return;
}
// prevent re-entrancy of this function (we can stay in here indefinitely
// since we may bring up a dialog box)
if (_fInDisconnectFunction) {
// some UI already launched
return;
}
_fInDisconnectFunction = TRUE;
CheckForDisconnect(FALSE);
_fInDisconnectFunction = FALSE;
if(FALSE == _fConnected) {
StopIdleTimer();
}
}
///////////////////////////////////////////////////////////////////////////
//
// RefreshTimeoutSettings
//
///////////////////////////////////////////////////////////////////////////
BOOL CDialMon::RefreshTimeoutSettings(void)
{
HKEY hKey;
BOOL fSuccess = FALSE;
TCHAR szKey[MAX_PATH];
DWORD dwRes, dwData, dwSize, dwDisp;
// assume disconnect monitoring is off
_dwTimeoutMins = 0;
_fDisconnectOnExit = FALSE;
// figure out appropriate key
wnsprintf(szKey, ARRAYSIZE(szKey), TEXT("%s\\Profile\\%s"),
REGSTR_PATH_REMOTEACCESS, _pszConnectoidName);
// open a regstry key to the internet settings section
dwRes = RegCreateKeyEx(HKEY_CURRENT_USER, szKey, 0, TEXT(""), 0,
KEY_QUERY_VALUE | KEY_SET_VALUE, NULL, &hKey, &dwDisp);
if(ERROR_SUCCESS == dwRes)
{
//
// is autodisconnect enabled?
//
dwSize = sizeof(DWORD);
if (RegQueryValueEx(hKey,szRegValEnableAutoDisconnect,NULL,NULL,
(LPBYTE) &dwData,&dwSize) == ERROR_SUCCESS)
{
if(dwData)
{
// what's the timeout?
dwSize = sizeof(DWORD);
if (RegQueryValueEx(hKey,szRegValDisconnectIdleTime,NULL,NULL,
(LPBYTE) &dwData,&dwSize) == ERROR_SUCCESS && dwData)
{
_dwTimeoutMins = dwData;
fSuccess = TRUE;
}
}
// is disconnect on exit enabled?
dwSize = sizeof(DWORD);
if (RegQueryValueEx(hKey,szRegValExitDisconnect,NULL,NULL,
(LPBYTE) &dwData,&dwSize) == ERROR_SUCCESS && dwData)
{
_fDisconnectOnExit = TRUE;
fSuccess = TRUE;
}
}
else
{
//
// couldn't find enable autodisconnect key. Set all disconnect
// settings to their defaults
//
// set class members to default values
_dwTimeoutMins = 20;
_fDisconnectOnExit = TRUE;
fSuccess = TRUE;
// enable idle disconnect and exit disconnect
dwData = 1;
RegSetValueEx(hKey, szRegValEnableAutoDisconnect, 0, REG_DWORD,
(LPBYTE)&dwData, sizeof(DWORD));
RegSetValueEx(hKey, szRegValExitDisconnect, 0, REG_DWORD,
(LPBYTE)&dwData, sizeof(DWORD));
// Save idle minutes
RegSetValueEx(hKey, szRegValDisconnectIdleTime, 0, REG_DWORD,
(LPBYTE)&_dwTimeoutMins, sizeof(DWORD));
}
RegCloseKey(hKey);
}
return fSuccess;
}
///////////////////////////////////////////////////////////////////////////
//
// Disconnection handling
//
///////////////////////////////////////////////////////////////////////////
void CDialMon::CheckForDisconnect(BOOL fTimer)
{
BOOL fPromptForDisconnect = TRUE; // assume we should prompt for disconnect
BOOL fDisconnectDisabled = FALSE;
BOOL fConnectoidAlive = FALSE;
RASCONN RasCon[MAX_CONNECTION];
DWORD dwBytes, dwRes, dwConnections = 0, i;
HRASCONN hConnection = NULL;
// variables for auto-hangup for other client apps. (MARS)
static int dwElapsedTicksSincePoll = 0;
static BOOL fPolledForHangup = false;
BOOL fClientsOkHangup = false;
#define MAX_MINS_CLIENT_RESPONSE 1
#ifdef DEBUG_KV
// skip all the connection code..
goto KVHACK;
#endif
// Verify we still have a connection
RasCon[0].dwSize = sizeof(RasCon[0]);
dwBytes = MAX_CONNECTION * sizeof(RasCon[0]);
dwRes = _RasEnumConnections(RasCon, &dwBytes, &dwConnections);
// If ras is connected at all, stay alive to monitor it
if(0 == dwConnections)
_fConnected = FALSE;
// Find connectoid we're supposed to watch
if(TEXT('\0') == *_pszConnectoidName) {
DBG_WARN("DisconnectHandler: No designated connection to monitor");
return;
}
for(i=0; i<dwConnections; i++) {
if(!StrCmp(RasCon[i].szEntryName, _pszConnectoidName)) {
fConnectoidAlive = TRUE;
hConnection = RasCon[i].hrasconn;
}
}
// if we're not connected to out monitor connectoid, ditch our hangup
// dialog if we have one and bail out
if(FALSE == fConnectoidAlive) {
if(_hDisconnectDlg) {
SendMessage(_hDisconnectDlg, WM_QUIT_DISCONNECT_DLG, 0, 0);
_hDisconnectDlg = NULL;
}
// Also make sure that if we were waiting for client (MARS) reponses for auto-hangup,
// we also clean up state information..
if( fPolledForHangup )
{
dwElapsedTicksSincePoll = 0;
fPolledForHangup = false;
}
return;
}
#ifdef DEBUG_KV
// label to jump to after skipping connection code..
// also need to set _dwTimeoutMins since without connection
KVHACK:_dwTimeoutMins = 2;
#endif
// Check timeout if we got a timer tick
if(fTimer) {
// increment tick count
_dwElapsedTicks ++;
// Haven't exceeded idle threshold or not watching for idle
if (0 == _dwTimeoutMins || _dwElapsedTicks < _dwTimeoutMins * 2)
fPromptForDisconnect = FALSE;
}
// THIS is a good place to message out to other clients (ie Mars ) and
// see if everybody wants to hang up ( this is the point where if
// fPromptForDisconnect is true, then the earlier behavior would have
// prompted for disconnect.
// If this is a disconnect because of IExplorer exiting, we
// probably don't want to hangup if there are other clients using dialmon.
if( !fTimer && g_pDialmonClients->HasEntries() )
return;
if( g_pDialmonClients->HasEntries() && fPromptForDisconnect )
{
if( fPolledForHangup )
{
// WM_CANHANGUP messages have been sent
// we can hangup if either all clients have replied yes,
// or if there are no refusals so far, and time has run out.
if( CanHangup() ||
( dwElapsedTicksSincePoll >= 2*MAX_MINS_CLIENT_RESPONSE ) )
{
//can hangup!
dwElapsedTicksSincePoll = 0;
fPolledForHangup = false;
fClientsOkHangup = true;
}
else
{
dwElapsedTicksSincePoll++;
//ensure that hangup doesn't occur on THIS particular timer message.
fPromptForDisconnect = false;
}
}
else
{
// WM_CANHANGUP queries may be sent out now..
BroadcastCanHangup( _dwTimeoutMins );
dwElapsedTicksSincePoll = 0;
fPolledForHangup = true;
//ensure that hangup doesn't occur now
fPromptForDisconnect = false;
}
}
else if( fPolledForHangup )
{
// activity restarted while waiting for client responses.
// do clean up of state information.
dwElapsedTicksSincePoll = 0;
fPolledForHangup = false;
}
if(FALSE == fPromptForDisconnect) {
return;
}
// prompt user to see if they want to hang up
if(fClientsOkHangup || PromptForDisconnect(fTimer, &fDisconnectDisabled)) {
// hang it up
ASSERT(hConnection);
if(hConnection)
_RasHangUp(hConnection);
// broadcast WM_HANGING_UP to remaining clients - REQUIRED??
if( g_pDialmonClients->HasEntries() )
BroadcastHangingUp();
_fConnected = FALSE;
}
if (fDisconnectDisabled) {
StopMonitoring();
}
_dwElapsedTicks = 0;
}
BOOL CDialMon::PromptForDisconnect(BOOL fTimer, BOOL *pfDisconnectDisabled)
{
ASSERT(_pszConnectoidName);
ASSERT(pfDisconnectDisabled);
// fill out struct to pass to dialog
DISCONNECTDLGINFO DisconnectDlgInfo;
memset(&DisconnectDlgInfo,0,sizeof(DisconnectDlgInfo));
DisconnectDlgInfo.pszConnectoidName = _pszConnectoidName;
DisconnectDlgInfo.fTimer = fTimer;
DisconnectDlgInfo.dwTimeout = _dwTimeoutMins;
DisconnectDlgInfo.pDialMon = this;
// choose the appropriate dialog depending on if this a "timeout" dialog
// or "app exiting" dialog
UINT uDlgTemplateID = fTimer ? IDD_DISCONNECT_PROMPT:IDD_APP_EXIT_PROMPT;
// run the dialog
BOOL fRet = (BOOL)DialogBoxParam(MLGetHinst(),MAKEINTRESOURCE(uDlgTemplateID),
NULL, DisconnectPromptDlgProc,(LPARAM) &DisconnectDlgInfo);
// dialog box stores its window handle in our class so we can send
// messages to it, clear the global handle now that it's dismissed
_hDisconnectDlg = NULL;
*pfDisconnectDisabled = FALSE;
if (!fRet && DisconnectDlgInfo.fDisconnectDisabled) {
*pfDisconnectDisabled=TRUE;
// turn off reg keys for this connection
TCHAR szKey[128];
DWORD dwRes, dwValue = 0;
HKEY hKey;
wnsprintf(szKey, ARRAYSIZE(szKey), TEXT("%s\\Profile\\%s"),
REGSTR_PATH_REMOTEACCESS, _pszConnectoidName);
dwRes = RegOpenKey(HKEY_CURRENT_USER, szKey, &hKey);
if(ERROR_SUCCESS == dwRes) {
// Turn off idle disconnect
RegSetValueEx(hKey, szRegValEnableAutoDisconnect, 0, REG_DWORD,
(LPBYTE)&dwValue, sizeof(DWORD));
// Turn off exit disconnect
RegSetValueEx(hKey, szRegValExitDisconnect, 0, REG_DWORD,
(LPBYTE)&dwValue, sizeof(DWORD));
RegCloseKey(hKey);
}
}
return fRet;
}
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
//
// Disconnect dialog implementation
//
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
INT_PTR CALLBACK DisconnectPromptDlgProc(HWND hDlg, UINT uMsg, WPARAM wParam,
LPARAM lParam)
{
switch (uMsg) {
case WM_INITDIALOG:
// lParam points to data struct, store a pointer to it in window data
SetWindowLongPtr(hDlg, DWLP_USER,lParam);
return DisconnectDlgInit(hDlg,(DISCONNECTDLGINFO *) lParam);
break;
case WM_COMMAND:
switch (wParam) {
case IDOK:
EndDialog(hDlg,TRUE);
break;
case IDCANCEL:
DisconnectDlgCancel(hDlg);
EndDialog(hDlg,FALSE);
break;
case IDC_DISABLE_AUTODISCONNECT:
DisconnectDlgDisableAutodisconnect(hDlg);
break;
}
break;
case WM_QUIT_DISCONNECT_DLG:
// parent window wants to terminate us
EndDialog(hDlg,FALSE);
break;
case WM_TIMER:
DisconnectDlgTimerProc(hDlg);
break;
}
return FALSE;
}
BOOL __cdecl _FormatMessage(LPCWSTR szTemplate, LPWSTR szBuf, UINT cchBuf, ...)
{
BOOL fRet;
va_list ArgList;
va_start(ArgList, cchBuf);
fRet = FormatMessageWrapW(FORMAT_MESSAGE_FROM_STRING, szTemplate, 0, 0, szBuf, cchBuf, &ArgList);
va_end(ArgList);
return fRet;
}
BOOL DisconnectDlgInit(HWND hDlg,DISCONNECTDLGINFO * pDisconnectDlgInfo)
{
ASSERT(pDisconnectDlgInfo);
if (!pDisconnectDlgInfo)
return FALSE;
// allocate buffers to build text for dialog
BUFFER BufText(MAX_RES_LEN + MAX_CONNECTOID_DISPLAY_LEN + 1);
BUFFER BufFmt(MAX_RES_LEN),BufConnectoidName(MAX_CONNECTOID_DISPLAY_LEN+4);
ASSERT(BufText && BufFmt && BufConnectoidName);
if (!BufText || !BufFmt || !BufConnectoidName)
return FALSE;
UINT uStringID;
// choose the appropriate text string for dialog
if (pDisconnectDlgInfo->fTimer) {
uStringID = IDS_DISCONNECT_DLG_TEXT;
} else {
uStringID = IDS_APP_EXIT_TEXT;
}
// load the format string from resource
MLLoadString(uStringID,BufFmt.QueryPtr(),BufFmt.QuerySize());
// copy the connectoid name into buffer, and truncate it if it's really
// long
StrCpyN(BufConnectoidName.QueryPtr(),pDisconnectDlgInfo->pszConnectoidName,
BufConnectoidName.QuerySize());
if (lstrlen(pDisconnectDlgInfo->pszConnectoidName) > MAX_CONNECTOID_DISPLAY_LEN) {
StrCpyN(((TCHAR *) BufConnectoidName.QueryPtr()) + MAX_CONNECTOID_DISPLAY_LEN,
szEllipsis, BufConnectoidName.QuerySize());
}
if (pDisconnectDlgInfo->fTimer)
{
_FormatMessage(BufFmt.QueryPtr(),
BufText.QueryPtr(),
BufText.QuerySize(),
BufConnectoidName.QueryPtr(),
pDisconnectDlgInfo->dwTimeout);
}
else
{
_FormatMessage(BufFmt.QueryPtr(),
BufText.QueryPtr(),
BufText.QuerySize(),
BufConnectoidName.QueryPtr());
}
// set text in dialog
SetDlgItemText(hDlg,IDC_TX1,BufText.QueryPtr());
// if this timeout dialog (which counts down), initialize countdown timer
if (pDisconnectDlgInfo->fTimer) {
pDisconnectDlgInfo->dwCountdownVal = DISCONNECT_DLG_COUNTDOWN;
DisconnectDlgShowCountdown(hDlg,pDisconnectDlgInfo->dwCountdownVal);
// set a one-second timer
g_uDialmonSecTimerID = SetTimer(hDlg,TIMER_ID_DIALMON_SEC,1000,NULL);
ASSERT(g_uDialmonSecTimerID);
if (!g_uDialmonSecTimerID) {
// it's very unlikely that setting the timer will fail... but if it
// does, then we'll act just like a normal dialog and won't have
// a countdown. Hide the countdown-related windows...
ShowWindow(GetDlgItem(hDlg,IDC_TX2),SW_HIDE);
ShowWindow(GetDlgItem(hDlg,IDC_GRP),SW_HIDE);
ShowWindow(GetDlgItem(hDlg,IDC_TIME_REMAINING),SW_HIDE);
ShowWindow(GetDlgItem(hDlg,IDC_TX3),SW_HIDE);
}
// beep to alert user
MessageBeep(MB_ICONEXCLAMATION);
}
// center this dialog on the screen
CenterWindow(hDlg,GetDesktopWindow());
// default: assume user does not disable auto disconnect, change
// this later if they do (this field is output to dialog invoker)
pDisconnectDlgInfo->fDisconnectDisabled = FALSE;
// Save dialog handle so we can get quit messages
pDisconnectDlgInfo->pDialMon->_hDisconnectDlg = hDlg;
return TRUE;
}
VOID DisconnectDlgCancel(HWND hDlg)
{
// get pointer to data struct out of window data
DISCONNECTDLGINFO * pDisconnectDlgInfo = (DISCONNECTDLGINFO *)
GetWindowLongPtr(hDlg, DWLP_USER);
ASSERT(pDisconnectDlgInfo);
// check to see if user checked 'disable autodisconnect' checkbox
if(IsDlgButtonChecked(hDlg,IDC_DISABLE_AUTODISCONNECT))
{
// set the output field to indicate that user wanted to disable
// auto disconnect
pDisconnectDlgInfo->fDisconnectDisabled = TRUE;
}
}
VOID DisconnectDlgTimerProc(HWND hDlg)
{
// ignore timer ticks (e.g. hold countdown) if "disable autodisconnect"
// checkbox is checked
if (IsDlgButtonChecked(hDlg,IDC_DISABLE_AUTODISCONNECT))
return;
// get pointer to data struct out of window data
DISCONNECTDLGINFO * pDisconnectDlgInfo =
(DISCONNECTDLGINFO *) GetWindowLongPtr(hDlg, DWLP_USER);
ASSERT(pDisconnectDlgInfo);
if (!pDisconnectDlgInfo)
return;
if (pDisconnectDlgInfo->dwCountdownVal) {
// decrement countdown value
pDisconnectDlgInfo->dwCountdownVal --;
// update the dialog with the new value
if (pDisconnectDlgInfo->dwCountdownVal) {
DisconnectDlgShowCountdown(hDlg,pDisconnectDlgInfo->dwCountdownVal);
return;
}
}
// countdown has run out!
// kill the timer
KillTimer(hDlg,g_uDialmonSecTimerID);
g_uDialmonSecTimerID = 0;
// send a 'OK' message to the dialog to dismiss it
SendMessage(hDlg,WM_COMMAND,IDOK,0);
}
VOID DisconnectDlgShowCountdown(HWND hDlg,DWORD dwSecsRemaining)
{
// build a string showing the number of seconds left
CHAR szSecs[10];
if (dwSecsRemaining == (DWORD) -1) {
lstrcpyA(szSecs, szDashes);
} else {
wnsprintfA(szSecs, ARRAYSIZE(szSecs), "%lu", dwSecsRemaining);
}
// set string in text control
SetDlgItemTextA(hDlg, IDC_TIME_REMAINING, szSecs);
}
VOID DisconnectDlgDisableAutodisconnect(HWND hDlg)
{
// get pointer to data struct out of window data
DISCONNECTDLGINFO * pDisconnectDlgInfo = (DISCONNECTDLGINFO *)
GetWindowLongPtr(hDlg, DWLP_USER);
ASSERT(pDisconnectDlgInfo);
// find out if disable autodisconnect checkbox is checked
BOOL fDisabled = IsDlgButtonChecked(hDlg,IDC_DISABLE_AUTODISCONNECT);
// enable or disable controls appropriately
EnableDisconnectDlgCtrls(hDlg,!fDisabled);
if (!fDisabled) {
// reset timer if we're re-enabling autodisconnect
pDisconnectDlgInfo->dwCountdownVal = DISCONNECT_DLG_COUNTDOWN;
// show timer value
DisconnectDlgShowCountdown(hDlg,pDisconnectDlgInfo->dwCountdownVal);
} else {
// show "--" in countdown value
DisconnectDlgShowCountdown(hDlg,(DWORD) -1);
}
}
VOID EnableDisconnectDlgCtrls(HWND hDlg,BOOL fEnable)
{
EnableWindow(GetDlgItem(hDlg,IDC_TX1),fEnable);
EnableWindow(GetDlgItem(hDlg,IDC_TX2),fEnable);
EnableWindow(GetDlgItem(hDlg,IDC_TX3),fEnable);
EnableWindow(GetDlgItem(hDlg,IDC_TIME_REMAINING),fEnable);
EnableWindow(GetDlgItem(hDlg,IDOK),fEnable);
}
BOOL CenterWindow (HWND hwndChild, HWND hwndParent)
{
RECT rChild, rParent;
int wChild, hChild, wParent, hParent;
int wScreen, hScreen, xNew, yNew;
HDC hdc;
// Get the Height and Width of the child window
GetWindowRect (hwndChild, &rChild);
wChild = rChild.right - rChild.left;
hChild = rChild.bottom - rChild.top;
// Get the Height and Width of the parent window
GetWindowRect (hwndParent, &rParent);
wParent = rParent.right - rParent.left;
hParent = rParent.bottom - rParent.top;
// Get the display limits
hdc = GetDC (hwndChild);
wScreen = GetDeviceCaps (hdc, HORZRES);
hScreen = GetDeviceCaps (hdc, VERTRES);
ReleaseDC (hwndChild, hdc);
// Calculate new X position, then adjust for screen
xNew = rParent.left + ((wParent - wChild) /2);
if (xNew < 0) {
xNew = 0;
} else if ((xNew+wChild) > wScreen) {
xNew = wScreen - wChild;
}
// Calculate new Y position, then adjust for screen
yNew = rParent.top + ((hParent - hChild) /2);
if (yNew < 0) {
yNew = 0;
} else if ((yNew+hChild) > hScreen) {
yNew = hScreen - hChild;
}
// Set it, and return
return SetWindowPos (hwndChild, NULL, xNew, yNew, 0, 0,
SWP_NOSIZE | SWP_NOZORDER);
}
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
//
// BUFFER class implementation
//
///////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////
BOOL BUFFER::Alloc( UINT cchBuffer )
{
_lpBuffer = (LPTSTR)::MemAlloc(LPTR,cchBuffer*sizeof(TCHAR));
if (_lpBuffer != NULL) {
_cch = cchBuffer;
return TRUE;
}
return FALSE;
}
BOOL BUFFER::Realloc( UINT cchNew )
{
LPVOID lpNew = ::MemReAlloc((HLOCAL)_lpBuffer, cchNew*sizeof(TCHAR),
LMEM_MOVEABLE | LMEM_ZEROINIT);
if (lpNew == NULL)
return FALSE;
_lpBuffer = (LPTSTR)lpNew;
_cch = cchNew;
return TRUE;
}
BUFFER::BUFFER( UINT cchInitial /* =0 */ )
: BUFFER_BASE(),
_lpBuffer( NULL )
{
if (cchInitial)
Alloc( cchInitial );
}
BUFFER::~BUFFER()
{
if (_lpBuffer != NULL) {
MemFree((HLOCAL) _lpBuffer);
_lpBuffer = NULL;
}
}
BOOL BUFFER::Resize( UINT cchNew )
{
BOOL fSuccess;
if (QuerySize() == 0)
fSuccess = Alloc( cchNew*sizeof(TCHAR) );
else {
fSuccess = Realloc( cchNew*sizeof(TCHAR) );
}
if (fSuccess)
_cch = cchNew;
return fSuccess;
}
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