Changed error returning in DataLoader

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

3 files changed, 29 insertions, 35 deletions

diff --git a/StarsEx/DataLoader.cpp b/StarsEx/DataLoader.cpp
index c5ad9bd..12a6c67 100644
--- a/StarsEx/DataLoader.cpp
+++ b/StarsEx/DataLoader.cpp
@@ -73,6 +73,14 @@ DataLoader::Reset()
 
 // +--------------------------------------------------------------------+
 
+const char*
+DataLoader::LastError() const
+{
+    return last_error;
+}
+
+// +--------------------------------------------------------------------+
+
 void
 DataLoader::UseFileSystem(bool use)
 {
@@ -100,22 +108,22 @@ DataLoader::InsertDatafile(const char* name, Group group, int pos)
 {
     FILE* f = fopen(name, "rb");
     if (!f) {
-        Print("   WARNING: could not open datafile '%s'\n", name);
-        return DATAFILE_NOTEXIST;
+        last_error = Text::format("Could not open datafile '%s'", name);
+        return FAILED;
     }
     fclose(f);
     auto archive = new DataArchive(name);
     if (!archive || archive->NumFiles() < 1) {
-        Print("   WARNING: invalid data file '%s'\n", name);
+        last_error = Text::format("Invalid datafile '%s'", name);
         if (archive) delete archive;
-        return DATAFILE_INVALID;
+        return FAILED;
     }
     DataSource* source = new ArchiveDataSource(archive, group);
     if (pos < 0)
         sources.append(source);
     else
         sources.insert(source, pos);
-    return DATAFILE_OK;
+    return 0;
 }
 
 void
@@ -133,7 +141,7 @@ DataLoader::ClearSources()
 int
 DataLoader::EnableDatafile(const char* name)
 {
-    int status = DATAFILE_NOTEXIST;
+    int status = FAILED;
 
     FILE* f;
     fopen_s(&f, name, "rb");
@@ -144,7 +152,7 @@ DataLoader::EnableDatafile(const char* name)
         DataArchive* a = new DataArchive(name);
 
         if (a && a->NumFiles() >= 1) {
-            status = DATAFILE_OK;
+            status = 0;
 
             bool found = false;
             ListIter<DataArchive> iter = archives;
@@ -159,17 +167,16 @@ DataLoader::EnableDatafile(const char* name)
             archives.append(a);
         }
         else {
-            Print("   WARNING: invalid data file '%s'\n", name);
-            status = DATAFILE_INVALID;
-
+            last_error = Text::format("Invalid datafile '%s'", name);
+            status = FAILED;
             delete a;
         }
 
         loader   = this;
     }
     else {
-        Print("   WARNING: could not open datafile '%s'\n", name);
-        status = DATAFILE_NOTEXIST;
+        last_error = Text::format("Could not open datafile '%s'", name);
+        status = FAILED;
     }
 
     return status;
@@ -183,11 +190,11 @@ DataLoader::DisableDatafile(const char* name)
         DataArchive* a = iter.value();
         if (!strcmp(a->Name(), name)) {
             delete iter.removeItem();
-            return DATAFILE_OK;
+            return 0;
         }
     }
 
-    return DATAFILE_NOTEXIST;
+    return FAILED;
 }
 
 // +--------------------------------------------------------------------+
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;
diff --git a/StarsEx/Starshatter.cpp b/StarsEx/Starshatter.cpp
index 62b728f..dc60533 100644
--- a/StarsEx/Starshatter.cpp
+++ b/StarsEx/Starshatter.cpp
@@ -171,14 +171,9 @@ chat_mode(0), exit_time(1.2), cutscene(0)
     loader       = DataLoader::GetLoader();
     int loadstat = loader->EnableDatafile("shatter.dat");
 
-    if (loadstat != DataLoader::DATAFILE_OK) {
-        const char* err_msg = loadstat == DataLoader::DATAFILE_INVALID ?
-        "The file 'shatter.dat' appears to have been damaged.  Please re-install Starshatter." :
-        "Starshatter cannot open the file 'shatter.dat'.  Please re-install Starshatter.";
-
-        ::MessageBox(hwnd, err_msg, "Starshatter - Error", MB_OK);
-        ::Print(err_msg);
-        ::Print("\n\nFATAL ERROR: EXIT.");
+    if (loadstat == DataLoader::FAILED) {
+        ::MessageBox(hwnd, loader->LastError(), "Starshatter - Error", MB_OK);
+        ::Print("FATAL ERROR: %s\n", loader->LastError());
         exit(-1);
     }
 
@@ -191,17 +186,6 @@ chat_mode(0), exit_time(1.2), cutscene(0)
     if (loader->FindFile("content.dat"))
     loader->EnableDatafile("content.dat");
 
-    //if (loadstat != DataLoader::DATAFILE_OK) {
-    //    const char* err_msg = loadstat == DataLoader::DATAFILE_INVALID ?
-    //    "The file 'content.dat' appears to have been damaged.  Please re-install the latest Starshatter update." :
-    //    "Starshatter cannot open the file 'content.dat'.  Please re-install the latest Starshatter update.";
-
-    //    ::MessageBox(hwnd, err_msg, "Starshatter - Error", MB_OK);
-    //    ::Print(err_msg);
-    //    ::Print("\n\nFATAL ERROR: EXIT.");
-    //    exit(-1);
-    //}
-
     LoadVideoConfig("video.cfg");
 
     // create the fonts