Changed error returning in DataLoader

This is to allow meaningful return values for identification of unique
sources.

1 files changed, 5 insertions, 2 deletions

diff --git a/StarsEx/DataLoader.h b/StarsEx/DataLoader.h
index 92cdd11..6d83e2f 100644
--- a/StarsEx/DataLoader.h
+++ b/StarsEx/DataLoader.h
@@ -29,10 +29,9 @@ class DataLoader
 public:
     using Group = DataSource::Group;
 
+    static constexpr int FAILED {-1};
     static const char* TYPENAME() { return "DataLoader"; }
 
-    enum { DATAFILE_OK, DATAFILE_INVALID, DATAFILE_NOTEXIST };
-
     DataLoader();
     virtual ~DataLoader();
 
@@ -40,6 +39,8 @@ public:
     static void          Initialize();
     static void          Close();
 
+    const char* LastError() const;
+
     void        Reset();
     void        UseFileSystem(bool use=true);
     void        UseVideo(Video* v);
@@ -83,6 +84,8 @@ private:
     Video*      video;
     bool        enable_media;
 
+    Text last_error;
+
     List<DataArchive> archives;
     List<DataSource> sources;
     DataSource* work_directory_source;