Use file associations to open config and log

- Use ShellExecute to open config and log files so that
  file associations can be used. If that fails fall-back to
  the default editor (notepad.exe).
- Remove the keys editor and log_viewer from registry.
  The user can change the editor/viewer through fie association.

Signed-off-by: Selva Nair <selva.nair@gmail.com>

Makefile.am

@@ -104,6 +104,7 @@ openvpn_gui_LDADD = \
 	-lwtsapi32 \
 	-lcrypt32 \
 	-lnetapi32 \
+	-lole32 \
 	-lsecur32
 
 openvpn-gui-res.o: $(openvpn_gui_RESOURCES) $(srcdir)/openvpn-gui-res.h

registry.c

@@ -128,13 +128,15 @@ GetRegistryKeys()
 
   if (!GetRegKey(_T("log_append"), o.append_string, _T("0"), _countof(o.append_string))) return(false);
 
-  _sntprintf_0(temp_path, _T("%s\\system32\\notepad.exe"), windows_dir);
-  if (!GetRegKey(_T("log_viewer"), o.log_viewer, 
-      temp_path, _countof(o.log_viewer))) return(false);
+  if (o.editor[0] != L'\0') /* set by cmd-line */
+      ExpandString (o.editor, _countof(o.editor));
+  else
+      _sntprintf_0(o.editor, _T("%s\\system32\\notepad.exe"), windows_dir);
 
-  _sntprintf_0(temp_path, _T("%s\\system32\\notepad.exe"), windows_dir);
-  if (!GetRegKey(_T("editor"), o.editor, 
-      temp_path, _countof(o.editor))) return(false);
+  if (o.log_viewer[0] != L'\0') /* set by cmd-line */
+      ExpandString (o.log_viewer, _countof(o.log_viewer));
+  else
+      _sntprintf_0(o.log_viewer, _T("%s\\system32\\notepad.exe"), windows_dir);
 
   if (!GetRegKey(_T("service_only"), o.service_only, _T("0"), _countof(o.service_only))) return(false);
 

viewlog.c

@@ -25,6 +25,8 @@
 
 #include <windows.h>
 #include <stdio.h>
+#include <shellapi.h>
+#include <objbase.h>
 
 #include "tray.h"
 #include "openvpn.h"
@@ -37,18 +39,29 @@ extern options_t o;
 
 void ViewLog(int config)
 {
-  TCHAR filename[200];
+  TCHAR filename[2*MAX_PATH];
 
   STARTUPINFO start_info;
   PROCESS_INFORMATION proc_info;
   SECURITY_ATTRIBUTES sa;
   SECURITY_DESCRIPTOR sd;
+  HINSTANCE status;
 
   CLEAR (start_info);
   CLEAR (proc_info);
   CLEAR (sa);
   CLEAR (sd);
 
+  /* Try first using file association */
+  CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE); /* Safe to init COM multiple times */
+  status = ShellExecuteW (o.hWnd, L"open", o.conn[config].log_path, NULL, o.log_dir, SW_SHOWNORMAL);
+
+  if (status > (HINSTANCE) 32) /* Success */
+    return;
+  else
+    PrintDebug (L"Opening log file using ShellExecute with verb = open failed"
+                 " for config '%s' (status = %lu)", o.conn[config].config_name, status);
+
   _sntprintf_0(filename, _T("%s \"%s\""), o.log_viewer, o.conn[config].log_path);
 
   /* fill in STARTUPINFO struct */
@@ -81,18 +94,30 @@ void ViewLog(int config)
 
 void EditConfig(int config)
 {
-  TCHAR filename[200];
+  TCHAR filename[2*MAX_PATH];
 
   STARTUPINFO start_info;
   PROCESS_INFORMATION proc_info;
   SECURITY_ATTRIBUTES sa;
   SECURITY_DESCRIPTOR sd;
+  HINSTANCE status;
 
   CLEAR (start_info);
   CLEAR (proc_info);
   CLEAR (sa);
   CLEAR (sd);
 
+  /* Try first using file association */
+  _sntprintf_0(filename, L"%s\\%s", o.conn[config].config_dir, o.conn[config].config_file);
+
+  CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE); /* Safe to init COM multiple times */
+  status = ShellExecuteW (o.hWnd, L"open", filename, NULL, o.conn[config].config_dir, SW_SHOWNORMAL);
+  if (status > (HINSTANCE) 32)
+    return;
+  else
+    PrintDebug (L"Opening config file using ShellExecute with verb = open failed"
+                 " for config '%s' (status = %lu)", o.conn[config].config_name, status);
+
   _sntprintf_0(filename, _T("%s \"%s\\%s\""), o.editor, o.conn[config].config_dir, o.conn[config].config_file);
 
   /* fill in STARTUPINFO struct */