188 lines
4.2 KiB
C++
188 lines
4.2 KiB
C++
#include "precomp.h"
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//
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// SWL.CPP
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// Shared Window List
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//
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// Copyright(c) Microsoft 1997-
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//
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#define MLZ_FILE_ZONE ZONE_CORE
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//
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// SWL strategy when network packets are not available
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//
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// The SWL only sends one type of message - the window structure message.
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// When no network packets are available the SWL will drop its current
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// packet and remember that the window structure has changed since it was
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// last able to send a packet. SWL_Periodic will also return FALSE when
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// this happens so that the DCS will know not to send any updates if it
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// failed to send a window structure.
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//
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// This pending of window structure messages is integrated with the
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// ignore envelopes where the SWL wants to ignore changes caused by itself
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// (or other components if they call the SWL_Begin/EndIgnoreWindowChanges
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// functions).
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//
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//
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// SWL strategy for backward compatibility.
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//
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// The differences between the R2.0 and 3.0 SWL protocol are:
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// 1. Tokenless packets.
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// 2. No shadows.
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//
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//
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// SWL_HostStarting()
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//
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BOOL ASHost::SWL_HostStarting(void)
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{
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BOOL rc = FALSE;
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DebugEntry(ASHost::SWL_HostStarting);
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//
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// If this is NT, get the name of our startup desktop
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//
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if (!g_asWin95)
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{
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ASSERT(m_aswlOurDesktopName[0] == 0);
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GetUserObjectInformation(GetThreadDesktop(g_asMainThreadId),
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UOI_NAME, m_aswlOurDesktopName,
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sizeof(m_aswlOurDesktopName), NULL);
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TRACE_OUT(("Our desktop name is %s", m_aswlOurDesktopName));
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}
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if (!m_aswlOurDesktopName[0])
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{
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// Use default name
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TRACE_OUT(("Couldn't get desktop name; using %s",
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NAME_DESKTOP_DEFAULT));
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lstrcpy(m_aswlOurDesktopName, NAME_DESKTOP_DEFAULT);
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}
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rc = TRUE;
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DebugExitBOOL(ASHost::SWL_HostStarting, rc);
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return(rc);
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}
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//
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// SWL_UpdateCurrentDesktop()
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//
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// This checks what the current desktop is, and if it's changed, updates
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// the NT input hooks for winlogon/screensaver for the service. But normal
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// SWL and AWC also make use of this info.
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//
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void ASHost::SWL_UpdateCurrentDesktop(void)
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{
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HDESK hDeskCurrent = NULL;
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UINT newCurrentDesktop;
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char szName[SWL_DESKTOPNAME_MAX];
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DebugEntry(ASHost::SWL_UpdateCurrentDesktop);
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newCurrentDesktop = DESKTOP_OURS;
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if (g_asWin95)
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{
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// Nothing to do
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DC_QUIT;
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}
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//
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// Get the current desktop. If we can't even get it, assume it's the
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// winlogon desktop.
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//
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hDeskCurrent = OpenInputDesktop(0, TRUE, DESKTOP_READOBJECTS);
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if (!hDeskCurrent)
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{
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TRACE_OUT(("OpenInputDesktop failed; must be WINLOGON"));
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newCurrentDesktop = DESKTOP_WINLOGON;
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DC_QUIT;
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}
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// Get the name of the current desktop
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szName[0] = 0;
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GetUserObjectInformation(hDeskCurrent, UOI_NAME, szName,
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sizeof(szName), NULL);
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TRACE_OUT(("GetUserObjectInformation returned %s for name", szName));
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if (!lstrcmpi(szName, m_aswlOurDesktopName))
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{
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newCurrentDesktop = DESKTOP_OURS;
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}
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else if (!lstrcmpi(szName, NAME_DESKTOP_SCREENSAVER))
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{
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newCurrentDesktop = DESKTOP_SCREENSAVER;
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}
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else if (!lstrcmpi(szName, NAME_DESKTOP_WINLOGON))
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{
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newCurrentDesktop = DESKTOP_WINLOGON;
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}
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else
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{
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newCurrentDesktop = DESKTOP_OTHER;
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}
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DC_EXIT_POINT:
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if (newCurrentDesktop != m_swlCurrentDesktop)
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{
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//
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// If this is the service, adjust where we playback events
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// and/or block local input.
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//
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OSI_DesktopSwitch(m_swlCurrentDesktop, newCurrentDesktop);
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m_swlCurrentDesktop = newCurrentDesktop;
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}
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if (hDeskCurrent != NULL)
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{
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CloseDesktop(hDeskCurrent);
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}
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DebugExitVOID(ASHost::SWL_UpdateCurrentDesktop);
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}
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//
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// SWL_IsOurDesktopActive()
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//
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BOOL ASHost::SWL_IsOurDesktopActive(void)
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{
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return(!g_asSharedMemory->fullScreen && (m_swlCurrentDesktop == DESKTOP_OURS));
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}
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//
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// SWL_Periodic()
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//
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// DESCRIPTION:
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//
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// Called periodically. If the window structure has changed (such that it
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// impacts remote systems) then send a new one if we can.
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//
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//
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void ASHost::SWL_Periodic(void)
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{
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DebugEntry(ASSHost::SWL_Periodic);
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SWL_UpdateCurrentDesktop();
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DebugExitVOID(ASHost::SWL_Periodic);
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}
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