windows: Handle the case where there are no serial ports at all.

[libserialport.git] / windows.c

diff --git a/windows.c b/windows.c
index a9d09279fdffa57228dae907955b6d7cf4be83e1..53c1b02333c5550a19d593d18fe3e1c4f296bafe 100644 (file)
--- a/windows.c
+++ b/windows.c
@@ -491,8 +491,12 @@ SP_PRIV enum sp_return list_ports(struct sp_port ***list)
        DEBUG("Opening registry key");
        if ((result = RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("HARDWARE\\DEVICEMAP\\SERIALCOMM"),
                        0, KEY_QUERY_VALUE, &key)) != ERROR_SUCCESS) {
-               SetLastError(result);
-               SET_FAIL(ret, "RegOpenKeyEx() failed");
+               /* It's possible for this key to not exist if there are no serial ports
+                * at all. In that case we're done. Return a failure for any other error. */
+               if (result != ERROR_FILE_NOT_FOUND) {
+                       SetLastError(result);
+                       SET_FAIL(ret, "RegOpenKeyEx() failed");
+               }
                goto out_done;
        }
        DEBUG("Querying registry key value and data sizes");