From 2e238a03b84e92f0c4aa51b8eb3adbc1cad730a5 Mon Sep 17 00:00:00 2001
From: Don Ho <don.h@free.fr>
Date: Sat, 26 Jan 2013 22:40:42 +0000
Subject: [PATCH] =?UTF-8?q?[BUG=5FFIXED]=20(Author:=20Pekka=20P=C3=B6yry)?=
 =?UTF-8?q?=20Can't=20open=20file=20via=20Explorer=20context=20menu=20when?=
 =?UTF-8?q?=20Notepad++=20is=20run=20as=20administrator.?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@1011 f5eea248-9336-0410-98b8-ebc06183d4e3
---
 PowerEditor/src/winmain.cpp | 38 +++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/PowerEditor/src/winmain.cpp b/PowerEditor/src/winmain.cpp
index 1f780bb0..0f9a7015 100644
--- a/PowerEditor/src/winmain.cpp
+++ b/PowerEditor/src/winmain.cpp
@@ -371,6 +371,44 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, LPSTR, int)
 	Win32Exception::installHandler();
 	try {
 		notepad_plus_plus.init(hInstance, NULL, quotFileName.c_str(), &cmdLineParams);
+
+		// Tell UAC that lower integrity processes are allowed to send WM_COPYDATA messages to this process (or window)
+		// This allows opening new files to already opened elevated Notepad++ process via explorer context menu.
+		if(pNppParameters->getWinVersion() >= WV_VISTA)
+		{
+			HMODULE hDll = GetModuleHandle(TEXT("user32.dll"));
+			if (hDll)
+			{
+				// According to MSDN ChangeWindowMessageFilter may not be supported in future versions of Windows, 
+				// that is why we use ChangeWindowMessageFilterEx if it is available (windows version >= Win7).
+
+				if(pNppParameters->getWinVersion() == WV_VISTA)
+				{
+					typedef BOOL (WINAPI *MESSAGEFILTERFUNC)(UINT message,DWORD dwFlag);
+					const DWORD MSGFLT_ADD = 1;
+
+					MESSAGEFILTERFUNC func = (MESSAGEFILTERFUNC)::GetProcAddress( hDll, "ChangeWindowMessageFilter" );
+
+					if (func)
+					{
+						func(WM_COPYDATA, MSGFLT_ADD);
+					}
+				}
+				else
+				{
+					typedef BOOL (WINAPI *MESSAGEFILTERFUNCEX)(HWND hWnd,UINT message,DWORD action,VOID* pChangeFilterStruct);
+					const DWORD MSGFLT_ALLOW = 1;
+
+					MESSAGEFILTERFUNCEX func = (MESSAGEFILTERFUNCEX)::GetProcAddress( hDll, "ChangeWindowMessageFilterEx" );
+
+					if (func)
+					{
+						func(notepad_plus_plus.getHSelf(), WM_COPYDATA, MSGFLT_ALLOW, NULL );
+					}
+				}
+			}
+		}
+
 		bool unicodeSupported = pNppParameters->getWinVersion() >= WV_NT;
 		bool going = true;
 		while (going)