BOOL CNTServiceControlManager::QueryLockStatus(LPQUERY_SERVICE_LOCK_STATUS& lpLockStatus) const
{
//Validate our parameters
ATLASSUME(m_hSCM != NULL);
ATLASSERT(lpLockStatus == NULL); //To prevent double overwrites, this function
//asserts if you do not send in a NULL pointer
DWORD dwBytesNeeded;
BOOL bSuccess = QueryServiceLockStatus(m_hSCM, NULL, 0, &dwBytesNeeded);
if (!bSuccess && GetLastError() == ERROR_INSUFFICIENT_BUFFER)
{
lpLockStatus = reinterpret_cast<LPQUERY_SERVICE_LOCK_STATUS>(new BYTE[dwBytesNeeded]);
DWORD dwSize;
bSuccess = QueryServiceLockStatus(m_hSCM, lpLockStatus, dwBytesNeeded, &dwSize);
}
return bSuccess;
}
HRESULT EnableService( LPCTSTR szSvcName, BOOL fDisable )
{
CAutoServiceHandle m_schSCManager = OpenSCManager( NULL, NULL, SC_MANAGER_ALL_ACCESS);
if(m_schSCManager==NULL)
return E_POINTER;
CAutoServiceHandle schService=NULL;
SC_LOCK sclLock;
LPQUERY_SERVICE_LOCK_STATUS lpqslsBuf;
DWORD dwBytesNeeded, dwStartType;
BOOL bSuccess=TRUE;
// Need to acquire database lock before reconfiguring.
sclLock = LockServiceDatabase(m_schSCManager);
// If the database cannot be locked, report the details.
if (sclLock == NULL)
{
// Exit if the database is not locked by another process.
if (GetLastError() != ERROR_SERVICE_DATABASE_LOCKED)
{
DPRINT("Database lock failed (%d)\n", GetLastError());
return E_FAIL;
}
// Allocate a buffer to get details about the lock.
lpqslsBuf = (LPQUERY_SERVICE_LOCK_STATUS) LocalAlloc(
LPTR, sizeof(QUERY_SERVICE_LOCK_STATUS)+256);
if (lpqslsBuf == NULL)
{
DPRINT("LocalAlloc failed (%d)\n", GetLastError());
return E_FAIL;
}
// Get and print the lock status information.
if (!QueryServiceLockStatus(
m_schSCManager,
lpqslsBuf,
sizeof(QUERY_SERVICE_LOCK_STATUS)+256,
&dwBytesNeeded) )
{
DPRINT("Query lock status failed (%d)", GetLastError());
return E_FAIL;
}
if (lpqslsBuf->fIsLocked)
DPRINT("Locked by: %s, duration: %d seconds\n",
lpqslsBuf->lpLockOwner,
lpqslsBuf->dwLockDuration);
else
DPRINT("No longer locked\n");
LocalFree(lpqslsBuf);
}
// The database is locked, so it is safe to make changes.
// Open a handle to the service.
schService = OpenService(
m_schSCManager, // SCManager database
szSvcName, // name of service
SERVICE_CHANGE_CONFIG); // need CHANGE access
if (schService == NULL)
{
DPRINT("OpenService failed (%d)\n", GetLastError());
return E_FAIL;
}
dwStartType = (fDisable) ? SERVICE_DISABLED : SERVICE_DEMAND_START;
// Make the changes.
if (! ChangeServiceConfig(
schService, // handle of service
SERVICE_NO_CHANGE, // service type: no change
dwStartType, // change service start type
SERVICE_NO_CHANGE, // error control: no change
NULL, // binary path: no change
NULL, // load order group: no change
NULL, // tag ID: no change
NULL, // dependencies: no change
NULL, // account name: no change
NULL, // password: no change
NULL) ) // display name: no change
{
DPRINT("ChangeServiceConfig failed (%d)\n", GetLastError());
bSuccess = FALSE;
}
else
DPRINT("ChangeServiceConfig succeeded.\n");
// Release the database lock.
UnlockServiceDatabase(sclLock);
return bSuccess ? S_OK : E_FAIL;
}
