Add better logging for file open and write errors

src/core/database.cpp

@@ -388,7 +388,7 @@ void Database::ExecSchemaCommandsFromFile(QSqlDatabase &db, const QString &filen
   // Open and read the database schema
   QFile schema_file(filename);
   if (!schema_file.open(QIODevice::ReadOnly)) {
-    qFatal("Couldn't open schema file %s", filename.toUtf8().constData());
+    qFatal("Couldn't open schema file %s for reading: %s", filename.toUtf8().constData(), schema_file.errorString().toUtf8().constData());
     return;
   }
   ExecSchemaCommands(db, QString::fromUtf8(schema_file.readAll()), schema_version, in_transaction);

src/core/songloader.cpp

@@ -281,7 +281,7 @@ SongLoader::Result SongLoader::LoadLocalAsync(const QString &filename) {
   // It's a local file, so check if it looks like a playlist. Read the first few bytes.
   QFile file(filename);
   if (!file.open(QIODevice::ReadOnly)) {
-    errors_ << tr("Could not open file %1").arg(filename);
+    errors_ << tr("Could not open file %1 for reading: %2").arg(filename).arg(file.errorString());
     return Error;
   }
   QByteArray data(file.read(PlaylistParser::kMagicSize));
@@ -312,6 +312,10 @@ SongLoader::Result SongLoader::LoadLocalAsync(const QString &filename) {
       }
       return Success;
     }
+    else {
+      errors_ << tr("Could not open CUE file %1 for reading: %2").arg(matching_cue).arg(cue.errorString());
+      return Error;
+    }
   }
 
   // Assume it's just a normal file
@@ -364,6 +368,9 @@ void SongLoader::LoadPlaylist(ParserBase *parser, const QString &filename) {
     songs_ = parser->Load(&file, filename, QFileInfo(filename).path());
     file.close();
   }
+  else {
+    errors_ << tr("Could not open playlist file %1 for reading: %2").arg(filename).arg(file.errorString());
+  }
 
 }
 

src/core/stylesheetloader.cpp

@@ -58,7 +58,7 @@ void StyleSheetLoader::SetStyleSheet(QWidget *widget, const QString &filename) {
   // Load the file
   QFile file(filename);
   if (!file.open(QIODevice::ReadOnly)) {
-    qLog(Error) << "Unable to open" << filename;
+    qLog(Error) << "Could not open stylesheet file" << filename << "for reading:" << file.errorString();
     return;
   }
   QTextStream stream(&file);

src/core/utilities.cpp

@@ -939,6 +939,9 @@ QByteArray ReadDataFromFile(const QString &filename) {
     data = file.readAll();
     file.close();
   }
+  else {
+    qLog(Error) << "Failed to open file" << filename << "for reading:" << file.errorString();
+  }
   return data;
 
 }