mirror of
https://github.com/kasmtech/KasmVNC.git
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272 lines
8.7 KiB
C++
272 lines
8.7 KiB
C++
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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// -=- CleanDesktop.cxx
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#include <windows.h>
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#include <wininet.h>
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#include <shlobj.h>
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#include <rfb_win32/CleanDesktop.h>
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#include <rfb_win32/CurrentUser.h>
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#include <rfb_win32/Registry.h>
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#include <rfb/LogWriter.h>
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#include <rdr/Exception.h>
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#include <os/os.h>
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#include <set>
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using namespace rfb;
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using namespace rfb::win32;
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static LogWriter vlog("CleanDesktop");
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struct ActiveDesktop {
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ActiveDesktop() : handle(0) {
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// - Contact Active Desktop
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HRESULT result = CoCreateInstance(CLSID_ActiveDesktop, NULL, CLSCTX_INPROC_SERVER,
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IID_IActiveDesktop, (PVOID*)&handle);
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if (result != S_OK)
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throw rdr::SystemException("failed to contact Active Desktop", result);
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}
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~ActiveDesktop() {
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if (handle)
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handle->Release();
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}
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// enableItem
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// enables or disables the Nth Active Desktop item
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bool enableItem(int i, bool enable_) {
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COMPONENT item;
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memset(&item, 0, sizeof(item));
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item.dwSize = sizeof(item);
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HRESULT hr = handle->GetDesktopItem(i, &item, 0);
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if (hr != S_OK) {
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vlog.error("unable to GetDesktopItem %d: %ld", i, hr);
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return false;
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}
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item.fChecked = enable_;
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vlog.debug("%sbling %d: \"%s\"", enable_ ? "ena" : "disa", i, (const char*)CStr(item.wszFriendlyName));
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hr = handle->ModifyDesktopItem(&item, COMP_ELEM_CHECKED);
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return hr == S_OK;
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}
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// enable
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// Attempts to enable/disable Active Desktop, returns true if the setting changed,
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// false otherwise.
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// If Active Desktop *can* be enabled/disabled then that is done.
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// If Active Desktop is always on (XP/2K3) then instead the individual items are
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// disabled, and true is returned to indicate that they need to be restored later.
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bool enable(bool enable_) {
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bool modifyComponents = false;
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vlog.debug("ActiveDesktop::enable");
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// - Firstly, try to disable Active Desktop entirely
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HRESULT hr;
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COMPONENTSOPT adOptions;
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memset(&adOptions, 0, sizeof(adOptions));
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adOptions.dwSize = sizeof(adOptions);
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// Attempt to actually disable/enable AD
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hr = handle->GetDesktopItemOptions(&adOptions, 0);
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if (hr == S_OK) {
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// If Active Desktop is already in the desired state then return false (no change)
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// NB: If AD is enabled AND restoreItems is set then we regard it as disabled...
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if (((adOptions.fActiveDesktop==0) && restoreItems.empty()) == (enable_==false))
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return false;
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adOptions.fActiveDesktop = enable_;
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hr = handle->SetDesktopItemOptions(&adOptions, 0);
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}
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// Apply the change, then test whether it actually took effect
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if (hr == S_OK)
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hr = handle->ApplyChanges(AD_APPLY_REFRESH);
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if (hr == S_OK)
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hr = handle->GetDesktopItemOptions(&adOptions, 0);
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if (hr == S_OK)
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modifyComponents = (adOptions.fActiveDesktop==0) != (enable_==false);
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if (hr != S_OK) {
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vlog.error("failed to get/set Active Desktop options: %ld", hr);
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return false;
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}
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if (enable_) {
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// - We are re-enabling Active Desktop. If there are components in restoreItems
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// then restore them!
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std::set<int>::const_iterator i;
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for (i=restoreItems.begin(); i!=restoreItems.end(); i++) {
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enableItem(*i, true);
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}
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restoreItems.clear();
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} else if (modifyComponents) {
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// - Disable all currently enabled items, and add the disabled ones to restoreItems
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int itemCount = 0;
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hr = handle->GetDesktopItemCount(&itemCount, 0);
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if (hr != S_OK) {
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vlog.error("failed to get desktop item count: %ld", hr);
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return false;
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}
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for (int i=0; i<itemCount; i++) {
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if (enableItem(i, false))
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restoreItems.insert(i);
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}
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}
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// - Apply whatever changes we have made, but DON'T save them!
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hr = handle->ApplyChanges(AD_APPLY_REFRESH);
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return hr == S_OK;
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}
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IActiveDesktop* handle;
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std::set<int> restoreItems;
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};
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DWORD SysParamsInfo(UINT action, UINT param, PVOID ptr, UINT ini) {
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DWORD r = ERROR_SUCCESS;
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if (!SystemParametersInfo(action, param, ptr, ini)) {
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r = GetLastError();
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vlog.info("SPI error: %lu", r);
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}
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return r;
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}
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CleanDesktop::CleanDesktop() : restoreActiveDesktop(false),
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restoreWallpaper(false),
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restoreEffects(false) {
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CoInitialize(0);
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}
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CleanDesktop::~CleanDesktop() {
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enableEffects();
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enableWallpaper();
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CoUninitialize();
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}
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void CleanDesktop::disableWallpaper() {
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try {
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ImpersonateCurrentUser icu;
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vlog.debug("disable desktop wallpaper/Active Desktop");
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// -=- First attempt to remove the wallpaper using Active Desktop
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try {
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ActiveDesktop ad;
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if (ad.enable(false))
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restoreActiveDesktop = true;
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} catch (rdr::Exception& e) {
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vlog.error("%s", e.str());
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}
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// -=- Switch of normal wallpaper and notify apps
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SysParamsInfo(SPI_SETDESKWALLPAPER, 0, (PVOID) "", SPIF_SENDCHANGE);
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restoreWallpaper = true;
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} catch (rdr::Exception& e) {
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vlog.info("%s", e.str());
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}
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}
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void CleanDesktop::enableWallpaper() {
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try {
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ImpersonateCurrentUser icu;
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if (restoreActiveDesktop) {
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vlog.debug("restore Active Desktop");
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// -=- First attempt to re-enable Active Desktop
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try {
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ActiveDesktop ad;
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ad.enable(true);
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restoreActiveDesktop = false;
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} catch (rdr::Exception& e) {
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vlog.error("%s", e.str());
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}
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}
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if (restoreWallpaper) {
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vlog.debug("restore desktop wallpaper");
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// -=- Then restore the standard wallpaper if required
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SysParamsInfo(SPI_SETDESKWALLPAPER, 0, NULL, SPIF_SENDCHANGE);
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restoreWallpaper = false;
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}
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} catch (rdr::Exception& e) {
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vlog.info("%s", e.str());
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}
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}
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void CleanDesktop::disableEffects() {
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try {
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ImpersonateCurrentUser icu;
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vlog.debug("disable desktop effects");
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SysParamsInfo(SPI_SETFONTSMOOTHING, FALSE, 0, SPIF_SENDCHANGE);
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if (SysParamsInfo(SPI_GETUIEFFECTS, 0, &uiEffects, 0) == ERROR_CALL_NOT_IMPLEMENTED) {
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SysParamsInfo(SPI_GETCOMBOBOXANIMATION, 0, &comboBoxAnim, 0);
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SysParamsInfo(SPI_GETGRADIENTCAPTIONS, 0, &gradientCaptions, 0);
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SysParamsInfo(SPI_GETHOTTRACKING, 0, &hotTracking, 0);
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SysParamsInfo(SPI_GETLISTBOXSMOOTHSCROLLING, 0, &listBoxSmoothScroll, 0);
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SysParamsInfo(SPI_GETMENUANIMATION, 0, &menuAnim, 0);
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SysParamsInfo(SPI_SETCOMBOBOXANIMATION, 0, FALSE, SPIF_SENDCHANGE);
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SysParamsInfo(SPI_SETGRADIENTCAPTIONS, 0, FALSE, SPIF_SENDCHANGE);
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SysParamsInfo(SPI_SETHOTTRACKING, 0, FALSE, SPIF_SENDCHANGE);
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SysParamsInfo(SPI_SETLISTBOXSMOOTHSCROLLING, 0, FALSE, SPIF_SENDCHANGE);
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SysParamsInfo(SPI_SETMENUANIMATION, 0, FALSE, SPIF_SENDCHANGE);
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} else {
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SysParamsInfo(SPI_SETUIEFFECTS, 0, FALSE, SPIF_SENDCHANGE);
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// We *always* restore UI effects overall, since there is no Windows GUI to do it
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uiEffects = TRUE;
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}
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restoreEffects = true;
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} catch (rdr::Exception& e) {
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vlog.info("%s", e.str());
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}
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}
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void CleanDesktop::enableEffects() {
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try {
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if (restoreEffects) {
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ImpersonateCurrentUser icu;
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vlog.debug("restore desktop effects");
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RegKey desktopCfg;
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desktopCfg.openKey(HKEY_CURRENT_USER, _T("Control Panel\\Desktop"));
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SysParamsInfo(SPI_SETFONTSMOOTHING, desktopCfg.getInt(_T("FontSmoothing"), 0) != 0, 0, SPIF_SENDCHANGE);
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if (SysParamsInfo(SPI_SETUIEFFECTS, 0, (void*)(intptr_t)uiEffects, SPIF_SENDCHANGE) == ERROR_CALL_NOT_IMPLEMENTED) {
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SysParamsInfo(SPI_SETCOMBOBOXANIMATION, 0, (void*)(intptr_t)comboBoxAnim, SPIF_SENDCHANGE);
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SysParamsInfo(SPI_SETGRADIENTCAPTIONS, 0, (void*)(intptr_t)gradientCaptions, SPIF_SENDCHANGE);
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SysParamsInfo(SPI_SETHOTTRACKING, 0, (void*)(intptr_t)hotTracking, SPIF_SENDCHANGE);
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SysParamsInfo(SPI_SETLISTBOXSMOOTHSCROLLING, 0, (void*)(intptr_t)listBoxSmoothScroll, SPIF_SENDCHANGE);
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SysParamsInfo(SPI_SETMENUANIMATION, 0, (void*)(intptr_t)menuAnim, SPIF_SENDCHANGE);
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}
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restoreEffects = false;
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}
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} catch (rdr::Exception& e) {
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vlog.info("%s", e.str());
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}
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}
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