+ DWORD size;
+
+ /* Record the location of Emacs to the App Paths key if we have
+ sufficient permissions to do so. This helps Windows find emacs quickly
+ if the user types emacs.exe in the "Run Program" dialog without having
+ emacs on their path. Some applications also use the same registry key
+ to discover the installation directory for programs they are looking for.
+ Multiple installations cannot be handled by this method, but it does not
+ affect the general operation of other installations of Emacs, and we
+ are blindly overwriting the Start Menu entries already.
+ */
+ if (RegCreateKeyEx (HKEY_LOCAL_MACHINE, REG_APP_PATH, 0, "",
+ REG_OPTION_NON_VOLATILE, KEY_WRITE, NULL,
+ &hrootkey, NULL) == ERROR_SUCCESS)
+ {
+ int len;
+ char *emacs_path;
+ HKEY gtk_key = NULL;
+
+ len = strlen (path) + 15; /* \bin\emacs.exe + terminator. */
+ emacs_path = (char *) alloca (len);
+ sprintf (emacs_path, "%s\\bin\\emacs.exe", path);
+
+ RegSetValueEx (hrootkey, NULL, 0, REG_EXPAND_SZ, emacs_path, len);
+
+ /* Look for a GTK installation. If found, add it to the library search
+ path for Emacs so that the image libraries it provides are available
+ to Emacs regardless of whether it is in the path or not. */
+ if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, REG_GTK, REG_OPTION_NON_VOLATILE,
+ KEY_READ, >k_key) == ERROR_SUCCESS)
+ {
+ if (RegQueryValueEx (gtk_key, "DllPath", NULL, NULL,
+ NULL, &size) == ERROR_SUCCESS)
+ {
+ char *gtk_path = (char *) alloca (size);
+ if (RegQueryValueEx (gtk_key, "DllPath", NULL, NULL,
+ gtk_path, &size) == ERROR_SUCCESS)
+ {
+ /* Make sure the emacs bin directory continues to be searched
+ first by including it as well. */
+ char *dll_paths;
+ HKEY runemacs_key = NULL;
+ len = strlen (path) + 5 + size;
+ dll_paths = (char *) alloca (size + strlen (path) + 1);
+ sprintf (dll_paths, "%s\\bin;%s", path, gtk_path);
+ RegSetValueEx (hrootkey, "Path", 0, REG_EXPAND_SZ,
+ dll_paths, len);
+
+ /* Set the same path for runemacs.exe, as the Explorer shell
+ looks this up, so the above does not take effect when
+ emacs.exe is spawned from runemacs.exe. */
+ if (RegCreateKeyEx (HKEY_LOCAL_MACHINE, REG_RUNEMACS_PATH,
+ 0, "", REG_OPTION_NON_VOLATILE,
+ KEY_WRITE, NULL, &runemacs_key, NULL)
+ == ERROR_SUCCESS)
+ {
+ RegSetValueEx (runemacs_key, "Path", 0, REG_EXPAND_SZ,
+ dll_paths, len);
+
+ RegCloseKey (runemacs_key);
+ }
+ }
+ }
+ RegCloseKey (gtk_key);
+ }
+ RegCloseKey (hrootkey);
+ }