[SHELL32][EXPLORER] Update system-wide environment variables (#663)

- Implement shell32 RegenerateUserEnvironment() function and use it.
- CShellBrowser and CDesktopBrowser implements WM_SETTINGCHANGE actions.

CORE-1459, CORE-14397

base/shell/explorer/traywnd.cpp

@@ -2849,12 +2849,12 @@ HandleTrayContextMenu:
         MESSAGE_HANDLER(WM_MOUSEMOVE, OnMouseMove)
         MESSAGE_HANDLER(WM_NCMOUSEMOVE, OnMouseMove)
         MESSAGE_HANDLER(WM_APP_TRAYDESTROY, OnAppTrayDestroy)
-        MESSAGE_HANDLER(TWM_OPENSTARTMENU, OnOpenStartMenu)
-        MESSAGE_HANDLER(TWM_DOEXITWINDOWS, OnDoExitWindows)
         MESSAGE_HANDLER(WM_CLOSE, OnDoExitWindows)
         MESSAGE_HANDLER(WM_HOTKEY, OnHotkey)
         MESSAGE_HANDLER(WM_NCCALCSIZE, OnNcCalcSize)
         MESSAGE_HANDLER(TWM_SETTINGSCHANGED, OnTaskbarSettingsChanged)
+        MESSAGE_HANDLER(TWM_OPENSTARTMENU, OnOpenStartMenu)
+        MESSAGE_HANDLER(TWM_DOEXITWINDOWS, OnDoExitWindows)
     ALT_MSG_MAP(1)
     END_MSG_MAP()
 

dll/win32/browseui/shellbrowser.cpp

@@ -23,6 +23,7 @@
 #include <shellapi.h>
 #include <htiframe.h>
 #include <strsafe.h>
+#include <undocshell.h>
 
 extern HRESULT IUnknown_ShowDW(IUnknown * punk, BOOL fShow);
 
@@ -599,7 +600,7 @@ public:
     LRESULT OnInitMenuPopup(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL &bHandled);
     LRESULT OnSetFocus(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL &bHandled);
     LRESULT RelayMsgToShellView(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL &bHandled);
-    LRESULT PropagateMessage(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL &bHandled);
+    LRESULT OnSettingChange(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL &bHandled);
     LRESULT OnClose(WORD wNotifyCode, WORD wID, HWND hWndCtl, BOOL &bHandled);
     LRESULT OnFolderOptions(WORD wNotifyCode, WORD wID, HWND hWndCtl, BOOL &bHandled);
     LRESULT OnMapNetworkDrive(WORD wNotifyCode, WORD wID, HWND hWndCtl, BOOL &bHandled);
@@ -645,7 +646,7 @@ public:
         MESSAGE_HANDLER(WM_MEASUREITEM, RelayMsgToShellView)
         MESSAGE_HANDLER(WM_DRAWITEM, RelayMsgToShellView)
         MESSAGE_HANDLER(WM_MENUSELECT, RelayMsgToShellView)
-        MESSAGE_HANDLER(WM_WININICHANGE, PropagateMessage)
+        MESSAGE_HANDLER(WM_SETTINGCHANGE, OnSettingChange)
         COMMAND_ID_HANDLER(IDM_FILE_CLOSE, OnClose)
         COMMAND_ID_HANDLER(IDM_TOOLS_FOLDEROPTIONS, OnFolderOptions)
         COMMAND_ID_HANDLER(IDM_TOOLS_MAPNETWORKDRIVE, OnMapNetworkDrive)
@@ -3512,8 +3513,11 @@ LRESULT CShellBrowser::RelayMsgToShellView(UINT uMsg, WPARAM wParam, LPARAM lPar
     return 0;
 }
 
-LRESULT CShellBrowser::PropagateMessage(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL &bHandled)
+LRESULT CShellBrowser::OnSettingChange(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL &bHandled)
 {
+    LPVOID lpEnvironment;
+    RegenerateUserEnvironment(&lpEnvironment, TRUE);
+
     SHPropagateMessage(m_hWnd, uMsg, wParam, lParam, TRUE);
     return 0;
 }

dll/win32/shell32/precomp.h

@@ -17,6 +17,7 @@
 #include <wincon.h>
 #include <commdlg.h>
 #include <ddeml.h>
+#include <userenv.h>
 
 #include <shlwapi.h>
 #include <shlobj.h>

dll/win32/shell32/shell32.cpp

@@ -63,6 +63,48 @@ AddCommasW(DWORD lValue, LPWSTR lpNumber)
     return lpNumber;
 }
 
+/*
+ * Implemented
+ */
+EXTERN_C BOOL
+WINAPI
+RegenerateUserEnvironment(LPVOID *lpEnvironment, BOOL bUpdateSelf)
+{
+    HANDLE hUserToken;
+    if (!OpenProcessToken(GetCurrentProcess(), TOKEN_READ | TOKEN_WRITE, &hUserToken))
+        return FALSE;
+
+    BOOL bResult = CreateEnvironmentBlock(lpEnvironment, hUserToken, TRUE);
+    if (!bResult || !lpEnvironment)
+    {
+        CloseHandle(hUserToken);
+        return FALSE;
+    }
+
+    if (bUpdateSelf)
+    {
+        LPWSTR pszz = (LPWSTR)*lpEnvironment;
+        if (!pszz)
+            return FALSE;
+
+        while (*pszz)
+        {
+            size_t cch = wcslen(pszz);
+            LPWSTR pchEqual = wcschr(pszz, L'=');
+            if (pchEqual)
+            {
+                CStringW strName(pszz, pchEqual - pszz);
+                SetEnvironmentVariableW(strName, pchEqual + 1);
+            }
+            pszz += cch + 1;
+        }
+    }
+
+    CloseHandle(hUserToken);
+
+    return bResult;
+}
+
 /**************************************************************************
  * Default ClassFactory types
  */

dll/win32/shell32/shelldesktop/CDesktopBrowser.cpp

@@ -390,6 +390,9 @@ LRESULT CDesktopBrowser::OnSize(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL &b
 
 LRESULT CDesktopBrowser::OnSettingChange(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL &bHandled)
 {
+    LPVOID lpEnvironment;
+    RegenerateUserEnvironment(&lpEnvironment, TRUE);
+
     if (m_hWndShellView)
     {
         /* Forward the message */

dll/win32/shell32/stubs.cpp

@@ -643,17 +643,6 @@ SHChangeNotifySuspendResume(BOOL bSuspend,
     return FALSE;
 }
 
-/*
- * Unimplemented
- */
-EXTERN_C BOOL
-WINAPI
-RegenerateUserEnvironment(LPVOID *lpUnknown, BOOL bUnknown)
-{
-    FIXME("RegenerateUserEnvironment() stub\n");
-    return FALSE;
-}
-
 /*
  * Unimplemented
  */

sdk/include/reactos/undocshell.h

@@ -526,6 +526,9 @@ typedef struct
  * Misc Stuff
  */
 
+BOOL WINAPI
+RegenerateUserEnvironment(LPVOID *lpEnvironment, BOOL bUpdateSelf);
+
 /* SHWaitForFileToOpen flags */
 #define SHWFF_ADD     0x01
 #define SHWFF_REMOVE  0x02