user: Launch explorer to manage the desktop window.

dlls/user/win.c

@@ -103,6 +103,16 @@ static WND *create_window_handle( HWND parent, HWND owner, ATOM atom,
         return NULL;
     }
 
+    if (!parent)  /* if parent is 0 we don't have a desktop window yet */
+    {
+        struct user_thread_info *thread_info = get_user_thread_info();
+
+        assert( !thread_info->desktop );
+        thread_info->desktop = full_parent ? full_parent : handle;
+        if (full_parent && !USER_Driver->pCreateDesktopWindow( thread_info->desktop ))
+            ERR( "failed to create desktop window\n" );
+    }
+
     USER_Lock();
 
     index = USER_HANDLE_TO_INDEX(handle);
@@ -946,7 +956,8 @@ static HWND WIN_CreateWindowEx( CREATESTRUCTA *cs, ATOM classAtom,
             WARN("No parent for child window\n" );
             return 0;  /* WS_CHILD needs a parent, but WS_POPUP doesn't */
         }
-        parent = GetDesktopWindow();
+        if (classAtom != LOWORD(DESKTOP_CLASS_ATOM))  /* are we creating the desktop itself? */
+            parent = GetDesktopWindow();
     }
 
     WIN_FixCoordinates(cs, &sw); /* fix default coordinates */
@@ -1553,16 +1564,45 @@ HWND WINAPI GetDesktopWindow(void)
 {
     struct user_thread_info *thread_info = get_user_thread_info();
 
+    if (thread_info->desktop) return thread_info->desktop;
+
+    SERVER_START_REQ( get_desktop_window )
+    {
+        req->force = 0;
+        if (!wine_server_call( req )) thread_info->desktop = reply->handle;
+    }
+    SERVER_END_REQ;
+
     if (!thread_info->desktop)
     {
+        STARTUPINFOW si;
+        PROCESS_INFORMATION pi;
+        WCHAR command_line[] = {'e','x','p','l','o','r','e','r','.','e','x','e',' ','/','d','e','s','k','t','o','p',0};
+
+        memset( &si, 0, sizeof(si) );
+        si.cb = sizeof(si);
+        if (CreateProcessW( NULL, command_line, NULL, NULL, FALSE, DETACHED_PROCESS,
+                            NULL, NULL, &si, &pi ))
+        {
+            TRACE( "started explorer pid %04lx tid %04lx\n", pi.dwProcessId, pi.dwThreadId );
+            WaitForInputIdle( pi.hProcess, 10000 );
+            CloseHandle( pi.hThread );
+            CloseHandle( pi.hProcess );
+
+        }
+        else WARN( "failed to start explorer, err %ld\n", GetLastError() );
+
         SERVER_START_REQ( get_desktop_window )
         {
+            req->force = 1;
             if (!wine_server_call( req )) thread_info->desktop = reply->handle;
         }
         SERVER_END_REQ;
-        if (!thread_info->desktop || !USER_Driver->pCreateDesktopWindow( thread_info->desktop ))
-            ERR( "failed to create desktop window\n" );
     }
+
+    if (!thread_info->desktop || !USER_Driver->pCreateDesktopWindow( thread_info->desktop ))
+        ERR( "failed to create desktop window\n" );
+
     return thread_info->desktop;
 }
 

dlls/x11drv/winpos.c

@@ -942,8 +942,6 @@ BOOL X11DRV_ShowWindow( HWND hwnd, INT cmd )
     RECT newPos = {0, 0, 0, 0};
     UINT swp = 0;
 
-    if (hwnd == GetDesktopWindow()) return FALSE;
-
     TRACE("hwnd=%p, cmd=%d, wasVisible %d\n", hwnd, cmd, wasVisible);
 
     switch(cmd)

include/wine/server_protocol.h

@@ -2543,6 +2543,7 @@ struct destroy_window_reply
 struct get_desktop_window_request
 {
     struct request_header __header;
+    int            force;
 };
 struct get_desktop_window_reply
 {
@@ -4360,6 +4361,6 @@ union generic_reply
     struct query_symlink_reply query_symlink_reply;
 };
 
-#define SERVER_PROTOCOL_VERSION 230
+#define SERVER_PROTOCOL_VERSION 231
 
 #endif /* __WINE_WINE_SERVER_PROTOCOL_H */

server/protocol.def

@@ -1804,6 +1804,7 @@ enum message_type
 
 /* Retrieve the desktop window for the current thread */
 @REQ(get_desktop_window)
+    int            force;       /* force creation if it doesn't exist */
 @REPLY
     user_handle_t  handle;      /* handle to the desktop window */
 @END

server/trace.c

@@ -2280,6 +2280,7 @@ static void dump_destroy_window_request( const struct destroy_window_request *re
 
 static void dump_get_desktop_window_request( const struct get_desktop_window_request *req )
 {
+    fprintf( stderr, " force=%d", req->force );
 }
 
 static void dump_get_desktop_window_reply( const struct get_desktop_window_reply *req )

server/window.c

@@ -1459,7 +1459,7 @@ DECL_HANDLER(destroy_window)
 /* retrieve the desktop window for the current thread */
 DECL_HANDLER(get_desktop_window)
 {
-    struct window *win = get_desktop_window( current, 1 );
+    struct window *win = get_desktop_window( current, req->force );
 
     if (win) reply->handle = win->handle;
 }