Initial attempt to allow COM GetActiveObject to be used for COM objects running in...

To do this, another process is created without uiAccess and the object is fetched there. We then use LresultFromObject to get it back to NVDA.
The public function is comHelper.getActiveObject.

diff --git a/source/comHelper.py b/source/comHelper.py
new file mode 100644 (file)
index 0000000..4be1d75
--- /dev/null
+++ b/source/comHelper.py
@@ -0,0 +1,43 @@
+#comHelper.py\r
+#A part of NonVisual Desktop Access (NVDA)\r
+#Copyright (C) 2013 NV Access Limited\r
+#This file is covered by the GNU General Public License.\r
+#See the file COPYING for more details.\r
+\r
+"""Utilities to help with issues related to COM.\r
+"""\r
+\r
+import subprocess\r
+import comtypes.client.dynamic\r
+from comtypes import IUnknown\r
+from comtypes.automation import IDispatch\r
+import oleacc\r
+import config\r
+\r
+def _lresultFromGetActiveObject(progid, dynamic):\r
+       o = comtypes.client.GetActiveObject(progid, dynamic=dynamic)\r
+       if not isinstance(o, IUnknown):\r
+               o = o._comobj\r
+       return oleacc.LresultFromObject(0, o)\r
+\r
+def getActiveObject(progid, dynamic=False):\r
+       """Get an active COM object, handling privilege issues.\r
+       This is similar to comtypes.client.GetActiveObject\r
+       except that it can retrieve objects from normal processes when NVDA is running with uiAccess.\r
+       """\r
+       # TODO: Try in our own process first; no point spawning a process when we don't need to.\r
+       p = subprocess.Popen((config.SLAVE_FILENAME, "comGetActiveObject", progid, "%d" % dynamic),\r
+               stdin=subprocess.PIPE, stdout=subprocess.PIPE)\r
+       try:\r
+               # FIXME: Throw better exception for COM error in slave.\r
+               lres = int(p.stdout.readline())\r
+               o = oleacc.ObjectFromLresult(lres, 0,\r
+                       IDispatch if dynamic else IUnknown)\r
+               if dynamic:\r
+                       o = comtypes.client.dynamic.Dispatch(o)\r
+               return o\r
+       finally:\r
+               # This will cause EOF for the waiting process, which will then exit.\r
+               p.stdin.close()\r
+               p.wait()\r
+               p.stdout.close()\r

diff --git a/source/nvda_slave.pyw b/source/nvda_slave.pyw
index 042dc8d..7eb568b 100755 (executable)
--- a/source/nvda_slave.pyw
+++ b/source/nvda_slave.pyw
@@ -81,6 +81,16 @@ def main():
                                _("Cannot install NVDA add-on from {path}.\n"\r
                                "You must be running NVDA to be able to install add-ons.").format(path=addonPath),\r
                                0, winUser.MB_ICONERROR)\r
+               elif action == "comGetActiveObject":\r
+                       import comHelper\r
+                       # py2exe scraps sys.stdout.\r
+                       sys.__stdout__.write("%s\n" %\r
+                               comHelper._lresultFromGetActiveObject(args[0], bool(int(args[1]))))\r
+                       sys.__stdout__.flush()\r
+                       try:\r
+                               raw_input()\r
+                       except EOFError:\r
+                               pass\r
                else:\r
                        raise ValueError("No such action")\r
 \r