Allow querying a service's name.

Since we can now open a service by its display name it may be
interesting to know what its canonical name is.

Find out with:

    nssm get <displayname> Name

README.txt

@@ -324,6 +324,7 @@ run NSSM itself.  The parameters recognised are as follows:
   DisplayName: Service display name.
   ImagePath: Path to the service executable.
   ObjectName: User account which runs the service.
+  Name: Service key name.
   Start: Service startup type.
   Type: Service type.
 
@@ -381,6 +382,12 @@ exit code of 2, run
     nssm set <servicename> AppExit 2 Exit
 
 
+The Name parameter can only be queried, not set.  It returns the service's
+registry key name.  This may be useful to know if you take advantage of
+the fact that you can substitute the service's display name anywhere where
+the syntax calls for <servicename>.
+
+
 The ObjectName parameter requires an additional argument only when setting
 a username.  The additional argument is the password of the user.
 
@@ -486,6 +493,10 @@ To remove the server:
 
     nssm remove UT2004 confirm
 
+To find out the service name of a service with a display name:
+
+    nssm get "Background Intelligent Transfer Service" Name
+
 
 Building NSSM from source
 -------------------------

settings.cpp

@@ -351,6 +351,15 @@ int native_get_imagepath(const TCHAR *service_name, void *param, const TCHAR *na
   return ret;
 }
 
+int native_set_name(const TCHAR *service_name, void *param, const TCHAR *name, void *default_value, value_t *value, const TCHAR *additional) {
+  print_message(stderr, NSSM_MESSAGE_CANNOT_RENAME_SERVICE);
+  return -1;
+}
+
+int native_get_name(const TCHAR *service_name, void *param, const TCHAR *name, void *default_value, value_t *value, const TCHAR *additional) {
+  return value_from_string(name, value, service_name);
+}
+
 int native_set_objectname(const TCHAR *service_name, void *param, const TCHAR *name, void *default_value, value_t *value, const TCHAR *additional) {
   SC_HANDLE service_handle = (SC_HANDLE) param;
   if (! service_handle) return -1;
@@ -666,6 +675,7 @@ settings_t settings[] = {
   { NSSM_NATIVE_DISPLAYNAME, REG_SZ, NULL, true, 0, native_set_displayname, native_get_displayname },
   { NSSM_NATIVE_IMAGEPATH, REG_EXPAND_SZ, NULL, true, 0, native_set_imagepath, native_get_imagepath },
   { NSSM_NATIVE_OBJECTNAME, REG_SZ, NSSM_LOCALSYSTEM_ACCOUNT, true, ADDITIONAL_SETTING, native_set_objectname, native_get_objectname },
+  { NSSM_NATIVE_NAME, REG_SZ, NULL, true, 0, native_set_name, native_get_name },
   { NSSM_NATIVE_STARTUP, REG_SZ, NULL, true, 0, native_set_startup, native_get_startup },
   { NSSM_NATIVE_TYPE, REG_SZ, NULL, true, 0, native_set_type, native_get_type },
   { NULL, NULL, NULL, NULL, NULL }

settings.h

@@ -4,6 +4,7 @@
 #define NSSM_NATIVE_DESCRIPTION _T("Description")
 #define NSSM_NATIVE_DISPLAYNAME _T("DisplayName")
 #define NSSM_NATIVE_IMAGEPATH _T("ImagePath")
+#define NSSM_NATIVE_NAME _T("Name")
 #define NSSM_NATIVE_OBJECTNAME _T("ObjectName")
 #define NSSM_NATIVE_STARTUP _T("Start")
 #define NSSM_NATIVE_TYPE _T("Type")